A Focussed Assessment with Sonography for Trauma (FAST) scan is a point-of-care ultrasound examination conducted when a trauma patient arrives. Its primary purpose is to identify the presence of intra-abdominal free fluid, which is typically assumed to be haemoperitoneum in the context of trauma. This information helps healthcare providers make decisions regarding further management of the patient.

The sensitivity of FAST scanning for detecting intraperitoneal fluid is approximately 90%, while its specificity is around 95%. However, its sensitivity for detecting solid organ injuries is much lower. As a result, FAST scanning has largely replaced diagnostic peritoneal lavage as the preferred initial method for assessing haemoperitoneum.

During a standard FAST scan, four regions are assessed. The first is the subxiphoid transverse view, which is used to check for pericardial effusion and left lobe liver injuries. The second is the longitudinal view of the right upper quadrant, which helps identify right liver injuries, right kidney injuries, and fluid in the hepatorenal recess (Morison’s pouch). The third is the longitudinal view of the left upper quadrant, which is used to assess for splenic injury and left kidney injury. Lastly, the transverse and longitudinal views of the suprapubic region are examined to assess the bladder and fluid in the pouch of Douglas.

In addition to the standard FAST scan, an extended FAST or eFAST may also be performed. This involves examining the left and right thoracic regions to assess for the presence of pneumothorax and haemothorax.

The hepatorenal recess is the deepest part of the peritoneal cavity when a patient is lying flat. Therefore, it is the most likely area for fluid to accumulate in a supine position.

In a patient with chronic hepatitis B, the typical serology results would show positive anti-HBc and positive HBsAg. This indicates that the patient has a long-term infection with hepatitis B. The presence of IgG anti-HBc indicates that the infection will persist for life, while IgM anti-HBc will only be present for about 6 months.

If a patient has positive anti-HBs but all other serological markers are negative, it suggests that they have been previously immunized against hepatitis B. On the other hand, if a patient has positive anti-HBs along with positive anti-HBc, it indicates that they have developed immunity following a past infection.

In the case of an acute hepatitis B infection that has been cleared more than 6 months ago, the serology results would typically show positive anti-HBc but negative HBsAg. This indicates that the infection has been successfully cleared by the immune system.

Further Reading:

Hepatitis B is a viral infection that is transmitted through exposure to infected blood or body fluids. It can also be passed from mother to child during childbirth. The incubation period for hepatitis B is typically 6-20 weeks. Common symptoms of hepatitis B include fever, jaundice, and elevated liver transaminases.

Complications of hepatitis B infection can include chronic hepatitis, which occurs in 5-10% of cases, fulminant liver failure, hepatocellular carcinoma, glomerulonephritis, polyarteritis nodosa, and cryoglobulinemia.

Immunization against hepatitis B is recommended for various at-risk groups, including healthcare workers, intravenous drug users, sex workers, close family contacts of infected individuals, and those with chronic liver disease or kidney disease. The vaccine contains HBsAg adsorbed onto an aluminum hydroxide adjuvant and is prepared using recombinant DNA technology. Most vaccination schedules involve three doses of the vaccine, with a booster recommended after 5 years.

Around 10-15% of adults may not respond adequately to the vaccine. Risk factors for poor response include age over 40, obesity, smoking, alcohol excess, and immunosuppression. Testing for anti-HBs levels is recommended for healthcare workers and patients with chronic kidney disease. Interpretation of anti-HBs levels can help determine the need for further vaccination or testing for infection.

In terms of serology, the presence of HBsAg indicates acute disease if present for 1-6 months, and chronic disease if present for more than 6 months. Anti-HBs indicates immunity, either through exposure or immunization. Anti-HBc indicates previous or current infection, with IgM anti-HBc appearing during acute or recent infection and IgG anti-HBc persisting. HbeAg is a marker of infectivity.

Management of hepatitis B involves notifying the Health Protection Unit for surveillance and contact tracing. Patients should be advised to avoid alcohol and take precautions to minimize transmission to partners and contacts. Referral to a gastroenterologist or hepatologist is recommended for all patients. Symptoms such as pain, nausea, and itch can be managed with appropriate drug treatment. Pegylated interferon-alpha and other antiviral medications like tenofovir and entecavir may be used to suppress viral replication in chronic carriers.

The main indications for thoracotomy in patients with haemothorax are prompt drainage of at least 1500 ml of blood, ongoing blood loss of more than 200 ml per hour for 2-4 hours, and the need for continued blood transfusion. Option 3 in the given choices meets these criteria as the blood loss remains above 200 ml per hour for more than 2 hours after the drain is inserted. Option 1 does not meet the criteria as the blood volume is below 1500 ml. Option 2 does not meet the criteria as the blood loss has not been ongoing for at least 2 hours. Option 4 does not meet the criteria as there is no information indicating the need for ongoing blood transfusion.

Further Reading:

Haemothorax is the accumulation of blood in the pleural cavity of the chest, usually resulting from chest trauma. It can be difficult to differentiate from other causes of pleural effusion on a chest X-ray. Massive haemothorax refers to a large volume of blood in the pleural space, which can impair physiological function by causing blood loss, reducing lung volume for gas exchange, and compressing thoracic structures such as the heart and IVC.

The management of haemothorax involves replacing lost blood volume and decompressing the chest. This is done through supplemental oxygen, IV access and cross-matching blood, IV fluid therapy, and the insertion of a chest tube. The chest tube is connected to an underwater seal and helps drain the fluid, pus, air, or blood from the pleural space. In cases where there is prompt drainage of a large amount of blood, ongoing significant blood loss, or the need for blood transfusion, thoracotomy and ligation of bleeding thoracic vessels may be necessary. It is important to have two IV accesses prior to inserting the chest drain to prevent a drop in blood pressure.

In summary, haemothorax is the accumulation of blood in the pleural cavity due to chest trauma. Managing haemothorax involves replacing lost blood volume and decompressing the chest through various interventions, including the insertion of a chest tube. Prompt intervention may be required in cases of significant blood loss or ongoing need for blood transfusion.

Hypothermic cardiac arrest is a rare situation that requires a tailored approach. Resuscitation is typically prolonged, but the prognosis for young, previously healthy individuals can be good. Hypothermic cardiac arrest may be associated with drowning. Hypothermia is defined as a core temperature below 35ºC and can be graded as mild, moderate, severe, or profound based on the core temperature. When the core temperature drops, basal metabolic rate falls and cell signaling between neurons decreases, leading to reduced tissue perfusion. Signs and symptoms of hypothermia progress as the core temperature drops, initially presenting as compensatory increases in heart rate and shivering, but eventually ceasing as the temperature drops into moderate hypothermia territory.

ECG changes associated with hypothermia include bradyarrhythmias, Osborn waves, prolonged PR, QRS, and QT intervals, shivering artifact, ventricular ectopics, and cardiac arrest. When managing hypothermic cardiac arrest, ALS should be initiated as per the standard ALS algorithm, but with modifications. It is important to check for signs of life, re-warm the patient, consider mechanical ventilation due to chest wall stiffness, adjust dosing or withhold drugs due to slowed drug metabolism, and correct electrolyte disturbances. The resuscitation of hypothermic patients is often prolonged and may continue for a number of hours.

Pulse checks during CPR may be difficult due to low blood pressure, and the pulse check is prolonged to 1 minute for this reason. Drug metabolism is slowed in hypothermic patients, leading to a build-up of potentially toxic plasma concentrations of administered drugs. Current guidance advises withholding drugs if the core temperature is below 30ºC and doubling the drug interval at core temperatures between 30 and 35ºC. Electrolyte disturbances are common in hypothermic patients, and it is important to interpret results keeping the setting in mind. Hypoglycemia should be treated, hypokalemia will often correct as the patient re-warms, ABG analyzers may not reflect the reality of the hypothermic patient, and severe hyperkalemia is a poor prognostic indicator.

Different warming measures can be used to increase the core body temperature, including external passive measures such as removal of wet clothes and insulation with blankets, external active measures such as forced heated air or hot-water immersion, and internal active measures such as inhalation of warm air, warmed intravenous fluids, gastric, bladder, peritoneal and/or pleural lavage and high volume renal haemofilter.

Recurrent or chronic tonsillitis is a clear indication for tonsillectomy, which is the surgical removal of the palatine tonsils. One common complication of this procedure is bleeding, which occurs in approximately 0.5-2% of cases. The bleeding that occurs after tonsillectomy is typically venous in nature and most frequently originates from the external palatine vein. This vein drains the lateral tonsillar region and ultimately empties into the facial vein. Additionally, bleeding can also arise from the tonsillar branch of the facial artery, which supplies the inferior pole of the palatine tonsil.

Patients who are being treated with insulin infusion for diabetic ketoacidosis (DKA) should expect their plasma glucose levels to decrease by at least 3 mmol/L per hour. The purpose of the insulin infusion is to correct both hyperglycemia and ketoacidosis. It is important to regularly review and check the insulin infusion to ensure it is working effectively. If any of the following are observed, the infusion rate should be adjusted accordingly: capillary ketones are not decreasing by at least 0.5 mmol/L per hour, venous bicarbonate is not increasing by at least 3 mmol/L per hour, or plasma glucose is not decreasing by at least 3 mmol/L per hour.

Further Reading:

Diabetic ketoacidosis (DKA) is a serious complication of diabetes that occurs due to a lack of insulin in the body. It is most commonly seen in individuals with type 1 diabetes but can also occur in type 2 diabetes. DKA is characterized by hyperglycemia, acidosis, and ketonaemia.

The pathophysiology of DKA involves insulin deficiency, which leads to increased glucose production and decreased glucose uptake by cells. This results in hyperglycemia and osmotic diuresis, leading to dehydration. Insulin deficiency also leads to increased lipolysis and the production of ketone bodies, which are acidic. The body attempts to buffer the pH change through metabolic and respiratory compensation, resulting in metabolic acidosis.

DKA can be precipitated by factors such as infection, physiological stress, non-compliance with insulin therapy, acute medical conditions, and certain medications. The clinical features of DKA include polydipsia, polyuria, signs of dehydration, ketotic breath smell, tachypnea, confusion, headache, nausea, vomiting, lethargy, and abdominal pain.

The diagnosis of DKA is based on the presence of ketonaemia or ketonuria, blood glucose levels above 11 mmol/L or known diabetes mellitus, and a blood pH below 7.3 or bicarbonate levels below 15 mmol/L. Initial investigations include blood gas analysis, urine dipstick for glucose and ketones, blood glucose measurement, and electrolyte levels.

Management of DKA involves fluid replacement, electrolyte correction, insulin therapy, and treatment of any underlying cause. Fluid replacement is typically done with isotonic saline, and potassium may need to be added depending on the patient’s levels. Insulin therapy is initiated with an intravenous infusion, and the rate is adjusted based on blood glucose levels. Monitoring of blood glucose, ketones, bicarbonate, and electrolytes is essential, and the insulin infusion is discontinued once ketones are below 0.3 mmol/L, pH is above 7.3, and bicarbonate is above 18 mmol/L.

Complications of DKA and its treatment include gastric stasis, thromboembolism, electrolyte disturbances, cerebral edema, hypoglycemia, acute respiratory distress syndrome, and acute kidney injury. Prompt medical intervention is crucial in managing DKA to prevent potentially fatal outcomes.

A subarachnoid haemorrhage (SAH) occurs when there is spontaneous bleeding into the subarachnoid space and is often a catastrophic event. The incidence of SAH is 9 cases per 100,000 people per year, and it typically affects individuals between the ages of 35 and 65.

The majority of SAH cases (80%) are caused by the rupture of berry (saccular) aneurysms, while 15% are caused by arteriovenous malformations (AVM). In less than 5% of cases, no specific cause can be found. Berry aneurysms are associated with polycystic kidneys, Ehlers-Danlos Syndrome, and coarctation of the aorta.

There are several risk factors for SAH, including smoking, hypertension, bleeding disorders, alcohol misuse, mycotic aneurysm, and a family history of the condition.

Patients with SAH typically experience a sudden and severe occipital headache, often described as the worst headache of my life. This may be accompanied by vomiting, collapse, seizures, and coma. Clinical signs of SAH include neck stiffness, a positive Kernig’s sign, and focal neurological abnormalities. Fundoscopy may reveal subhyaloid retinal haemorrhages in approximately 25% of patients.

Re-bleeding occurs in 30-40% of patients who survive the initial episode, with the highest risk occurring between 7 and 14 days after the initial event.

Untreated SAH has a mortality rate of nearly 50% within the first eight weeks following presentation. Prolonged coma is associated with a 100% mortality rate.

The first-line investigation for SAH is a CT head scan, which can detect over 95% of cases if performed within the first 24 hours. The sensitivity of the CT scan increases to nearly 100% if performed within 6 hours of symptom onset. If the CT scan is negative and there are no contraindications, a lumbar puncture (LP) should be performed at least 12 hours after the onset of headache to diagnose SAH. Approximately 3% of patients with a negative CT scan will be confirmed to have had an SAH following an LP.

The individuals in charge of overseeing the scene are referred to as incident officers. Each service involved in the incident will have its own designated incident officer, such as the Police Incident Officer (PIO), Ambulance Incident Officer (AIO), Fire Incident Officer (FIO), and Medical Incident Officer (MIO).

The Police hold ultimate responsibility for the scene, making the PIO the one in overall control. However, the Ambulance Service is often the first to arrive at the scene. In such cases, a senior crew member will be assigned as the AIO. The AIO will assume command until a higher-ranking officer arrives and will be responsible for various tasks, including assessing the situation, declaring a major incident, determining the location for the Control Point, Casualty Clearing Station (CCS), and Ambulance Parking Point, planning ambulance routes, communicating with all health service personnel present, and discussing the need for additional support and equipment with the chain of command.

Numerous ambulances may be present at the scene, but the control vehicle can be identified by its flashing blue lights. Once the AIO hands over control, the MIO will assume managerial responsibility for deploying health service personnel and closely coordinate with the AIO to ensure efficient resource management.

Blood transfusion is a crucial treatment that can save lives, but it also comes with various risks and potential problems. These include immunological complications, administration errors, infections, and immune dilution. While there has been an improvement in safety procedures and a reduction in transfusion use, errors and serious adverse reactions still occur and often go unreported.

Mild allergic reactions during blood transfusion are relatively common and typically occur within a few minutes of starting the transfusion. These reactions happen when patients have antibodies that react with foreign plasma proteins in the transfused blood components. Symptoms of mild allergic reactions include urticaria, Pruritus, and hives.

Anaphylaxis, on the other hand, is much rarer and occurs when an individual has previously been sensitized to an allergen present in the blood. When re-exposed to the allergen, the body releases IgE or IgG antibodies, leading to severe symptoms such as bronchospasm, laryngospasm, abdominal pain, nausea, vomiting, hypotension, shock, and loss of consciousness. Anaphylaxis can be fatal.

Mild allergic reactions can be managed by slowing down the transfusion rate and administering antihistamines. If there is no progression after 30 minutes, the transfusion may continue. Patients who have experienced repeated allergic reactions to transfusion should be given pre-treatment with chlorpheniramine. In cases of anaphylaxis, the transfusion should be stopped immediately, and the patient should receive oxygen, adrenaline, corticosteroids, and antihistamines following the ALS protocol.

The table below summarizes the main transfusion reactions and complications, along with their features and management:

Complication | Features | Management
Febrile transfusion reaction | 1 degree rise in temperature, chills, malaise | Supportive care, paracetamol
Acute haemolytic reaction | Fever, chills, pain at transfusion site, nausea, vomiting, dark urine | STOP THE TRANSFUSION, administer IV fluids, diuretics if necessary
Delayed haemolytic reaction | Fever, anaemia, jaundice, haemoglobinuria | Monitor anaemia and renal function, treat as required
Allergic reaction | Urticaria, Pruritus, hives | Symptomatic treatment with ant

TCA toxicity can be identified through specific changes seen on an electrocardiogram (ECG). Sinus tachycardia, which is a faster than normal heart rate, and widening of the QRS complex are key features of TCA toxicity. These ECG changes occur due to the blocking of sodium channels and muscarinic receptors (M1) by the medication. In the case of an amitriptyline overdose, additional ECG changes may include prolongation of the QT interval, an R/S ratio greater than 0.7 in lead aVR, and the presence of ventricular arrhythmias such as torsades de pointes. The severity of the QRS prolongation on the ECG is associated with the likelihood of adverse events. A QRS duration greater than 100 ms is predictive of seizures, while a QRS duration greater than 160 ms is predictive of ventricular arrhythmias like ventricular tachycardia or torsades de pointes.

Further Reading:

Tricyclic antidepressant (TCA) overdose is a common occurrence in emergency departments, with drugs like amitriptyline and dosulepin being particularly dangerous. TCAs work by inhibiting the reuptake of norepinephrine and serotonin in the central nervous system. In cases of toxicity, TCAs block various receptors, including alpha-adrenergic, histaminic, muscarinic, and serotonin receptors. This can lead to symptoms such as hypotension, altered mental state, signs of anticholinergic toxicity, and serotonin receptor effects.

TCAs primarily cause cardiac toxicity by blocking sodium and potassium channels. This can result in a slowing of the action potential, prolongation of the QRS complex, and bradycardia. However, the blockade of muscarinic receptors also leads to tachycardia in TCA overdose. QT prolongation and Torsades de Pointes can occur due to potassium channel blockade. TCAs can also have a toxic effect on the myocardium, causing decreased cardiac contractility and hypotension.

Early symptoms of TCA overdose are related to their anticholinergic properties and may include dry mouth, pyrexia, dilated pupils, agitation, sinus tachycardia, blurred vision, flushed skin, tremor, and confusion. Severe poisoning can lead to arrhythmias, seizures, metabolic acidosis, and coma. ECG changes commonly seen in TCA overdose include sinus tachycardia, widening of the QRS complex, prolongation of the QT interval, and an R/S ratio >0.7 in lead aVR.

Management of TCA overdose involves ensuring a patent airway, administering activated charcoal if ingestion occurred within 1 hour and the airway is intact, and considering gastric lavage for life-threatening cases within 1 hour of ingestion. Serial ECGs and blood gas analysis are important for monitoring. Intravenous fluids and correction of hypoxia are the first-line therapies. IV sodium bicarbonate is used to treat haemodynamic instability caused by TCA overdose, and benzodiazepines are the treatment of choice for seizure control. Other treatments that may be considered include glucagon, magnesium sulfate, and intravenous lipid emulsion.

There are certain things to avoid in TCA overdose, such as anti-arrhythmics like quinidine and flecainide, as they can prolonged depolarization. Amiodarone should

The maximum safe dose of plain lidocaine is 3 mg per kilogram of body weight, with a maximum limit of 200 mg. However, when lidocaine is administered with adrenaline in a 1:200,000 ratio, the maximum safe dose increases to 7 mg per kilogram of body weight, with a maximum limit of 500 mg.

In this particular case, the patient weighs 50 kg, so the maximum safe dose of lidocaine hydrochloride would be 50 multiplied by 3 mg, resulting in a total of 150 mg.

For more detailed information on lidocaine hydrochloride, you can refer to the BNF section dedicated to this topic.

Heat exhaustion typically comes before heat stroke. If left untreated, heat exhaustion often progresses to heat stroke. The body’s ability to dissipate heat is still functioning, and the body temperature is usually below 41°C. Common symptoms include nausea, decreased urine output, weakness, headache, thirst, and a fast heart rate. The central nervous system is usually unaffected. Patients often complain of feeling hot and appear flushed and sweaty.

Heat cramps are characterized by intense thirst and muscle cramps. Body temperature is often elevated but usually remains below 40°C. Sweating, heat dissipation mechanisms, and cognitive function are preserved, and there is no neurological impairment.

Heat stroke is defined as a systemic inflammatory response with a core temperature above 40.6°C, accompanied by changes in mental state and varying levels of organ dysfunction. Typical symptoms of heat stroke include:

– Core temperature above 40.6°C
– Early symptoms include extreme fatigue, headache, fainting, flushed face, vomiting, and diarrhea
– The skin is usually hot and dry
– Sweating may occur in about 50% of cases of exertional heat stroke
– The loss of the ability to sweat is a late and concerning sign
– Hyperventilation is almost always present
– Cardiovascular dysfunction, such as irregular heart rhythms, low blood pressure, and shock
– Respiratory dysfunction, including acute respiratory distress syndrome (ARDS)
– Central nervous system dysfunction, including seizures and coma
– If the temperature rises above 41.5°C, multiple organ failure, coagulopathy, and rhabdomyolysis can occur

Malignant hypothermia and neuroleptic malignant syndrome are highly unlikely in this case, as the patient has no recent history of general anesthesia or taking phenothiazines or other antipsychotics, respectively.

The traffic light system is a useful tool for evaluating the potential risk of serious illness in children. This system categorizes clinical features into three groups based on severity: red (high-risk), amber (intermediate-risk), and green (low-risk).

Children displaying any of the following symptoms or signs fall into the high-risk group for serious illness: pale/mottled/ashen/blue skin, lips or tongue; lack of response to social cues; appearing unwell to a healthcare professional; inability to wake or stay awake when roused; weak, high-pitched, or continuous cry; grunting; respiratory rate exceeding 60 breaths per minute; moderate or severe chest indrawing; reduced skin turgor; and bulging fontanelle.

Children exhibiting any of the following symptoms or signs are considered at least intermediate-risk for serious illness: pallor of skin, lips or tongue reported by parent or caregiver; abnormal response to social cues; absence of a smile; waking only with prolonged stimulation; decreased activity; nasal flaring; dry mucous membranes; poor feeding in infants; reduced urine output; and rigors.

Children displaying any of the following symptoms or signs are classified as low-risk for serious illness: normal color of skin, lips, and tongue; normal response to social cues; contentment and smiles; staying awake or quickly awakening; strong normal cry or absence of crying; normal skin and eyes; and moist mucous membranes.

To summarize, children with fever and any symptoms or signs in the red column are considered high-risk, while those with fever and any symptoms or signs in the amber column (but none in the red column) are considered intermediate-risk. Children with symptoms and signs in the green column (and none in the amber or red columns) are classified as low-risk.

For more information, you can refer to the NICE guidelines on the assessment and initial management of fever in children under 5, as well as the NICE Clinical Knowledge Summary on the management of feverish children.

Acute post-streptococcal glomerulonephritis is a condition that usually occurs at least 2 weeks after a person has had scarlet fever. In this case, the patient’s symptoms are consistent with this condition. It is important to note that the sore throat and rash associated with scarlet fever can be mild and may be mistaken for a generic viral illness with hives. Acute post-streptococcal glomerulonephritis typically presents with blood in the urine (which may appear brown like coca-cola) and protein in the urine. Other symptoms may include decreased urine output, swelling in the extremities, and high blood pressure. It is rare for this condition to cause permanent kidney damage.

Further Reading:

Scarlet fever is a reaction to erythrogenic toxins produced by Group A haemolytic streptococci, usually Streptococcus pyogenes. It is more common in children aged 2-6 years, with the peak incidence at 4 years. The typical presentation of scarlet fever includes fever, malaise, sore throat (tonsillitis), and a rash. The rash appears 1-2 days after the fever and sore throat symptoms and consists of fine punctate erythema that first appears on the torso and spares the face. The rash has a rough ‘sandpaper’ texture and desquamation occurs later, particularly around the fingers and toes. Another characteristic feature is the ‘strawberry tongue’, which initially has a white coating and swollen, reddened papillae, and later becomes red and inflamed. Diagnosis is usually made by a throat swab, but antibiotic treatment should be started immediately without waiting for the results. The recommended treatment is oral penicillin V, but patients with a penicillin allergy should be given azithromycin. Children can return to school 24 hours after starting antibiotics. Scarlet fever is a notifiable disease. Complications of scarlet fever include otitis media, rheumatic fever, and acute glomerulonephritis.

The pupillary light reflex is a reflex that regulates the size of the pupil in response to the intensity of light that reaches the retina. It consists of two separate pathways, the afferent pathway and the efferent pathway.

The afferent pathway begins with light entering the pupil and stimulating the retinal ganglion cells in the retina. These cells then transmit the light signal to the optic nerve. At the optic chiasm, the nasal retinal fibers cross to the opposite optic tract, while the temporal retinal fibers remain in the same optic tract. The fibers from the optic tracts then project and synapse in the pretectal nuclei in the dorsal midbrain. From there, the pretectal nuclei send fibers to the ipsilateral Edinger-Westphal nucleus via the posterior commissure.

On the other hand, the efferent pathway starts with the Edinger-Westphal nucleus projecting preganglionic parasympathetic fibers. These fibers exit the midbrain and travel along the oculomotor nerve. They then synapse on post-ganglionic parasympathetic fibers in the ciliary ganglion. The post-ganglionic fibers, known as the short ciliary nerves, innervate the sphincter muscle of the pupils, causing them to constrict.

The result of these pathways is that when light is shone in one eye, both the direct pupillary light reflex (ipsilateral eye) and the consensual pupillary light reflex (contralateral eye) occur.

Lesions affecting the pupillary light reflex can be identified by comparing the direct and consensual reactions to light in both eyes. If the optic nerve of the first eye is damaged, both the direct and consensual reflexes in the second eye will be lost. However, when light is shone into the second eye, the pupil of the first eye will still constrict. If the optic nerve of the second eye is damaged, the second eye will constrict consensually when light is shone into the unaffected first eye. If the oculomotor nerve of the first eye is damaged, the first eye will have no direct light reflex, but the second eye will still constrict consensually. Finally, if the oculomotor nerve of the second eye is damaged, there will be no consensual constriction of the second eye when light is shone into the unaffected first eye.

The Seidel test is a method used to assess ocular trauma. The procedure involves applying a 10% fluorescein strip to the affected area and examining it using a cobalt blue filter. If there is a corneal laceration with leakage of aqueous fluid, the dye will be diluted by the fluid, resulting in a visible stream.

In addition to the Seidel test, there are several other important steps to be taken during an eye examination for trauma. These include inspecting the overall appearance of the eye, examining the lids and peri-orbital bones, assessing visual acuity in both eyes, testing visual fields by confrontation, evaluating eye movements, measuring pupil size and response to light and accommodation, checking for foreign bodies using a slit lamp, performing fundoscopy and assessing the red reflex.

The Amsler grid test is a useful tool for detecting central visual field defects and aiding in the diagnosis of age-related macular degeneration. A positive Amsler test is indicated by the appearance of curved or wavy lines on the grid.

Tonometry is a technique used to measure intraocular pressure (IOP), which is helpful in diagnosing glaucoma.

Retinal photography is a sophisticated imaging process that involves using a digital camera to capture detailed pictures of the retina. It is primarily used to document the health of various structures in the eye, such as the optic nerve, posterior pole, macula, retina, and its blood vessels. However, it is not typically used as part of the initial evaluation for trauma.

Eye pH measurement is a valuable tool in evaluating chemical eye injuries.

Behçet’s syndrome is a systemic vasculitis that is mediated by the immune system. It is characterized by various symptoms, including polyarthritis, which primarily affects large joints. Additionally, patients with Behçet’s syndrome often experience recurrent oral and genital ulcers. Ocular disease is also common, with manifestations such as uveitis, hypopyon, and iridocyclitis. Furthermore, neurological involvement can occur, leading to demyelination, parkinsonism, and dementia. In this particular case, the patient’s eye examination reveals features consistent with anterior uveitis and the presence of a hypopyon. While several conditions can cause anterior uveitis, the patient’s history of joint pain in large joints and recurrent oral and genital ulcers strongly suggest Behçet’s syndrome as the most likely diagnosis.

The intravascular volume of an infant is approximately 80 ml/kg, while in older children it is around 70 ml/kg. Dehydration itself does not lead to death, but shock can occur when there is a loss of 20 ml/kg from the intravascular space. Clinical dehydration becomes evident only after total losses greater than 25 ml/kg.

The table below summarizes the maintenance fluid requirements for well, normal children:

Bodyweight:
– First 10 kg: Daily fluid requirement of 100 ml/kg and hourly fluid requirement of 4 ml/kg.
– Second 10 kg: Daily fluid requirement of 50 ml/kg and hourly fluid requirement of 2 ml/kg.
– Subsequent kg: Daily fluid requirement of 20 ml/kg and hourly fluid requirement of 1 ml/kg.

Based on this information, the hourly maintenance fluid requirements for this child can be calculated as follows:

– First 10 kg: 4 ml/kg = 40 ml
– Second 10 kg: 2 ml/kg = 20 ml
– Subsequent kg: 1 ml/kg = 5 ml

Therefore, the total hourly maintenance fluid requirement for this child is 65 ml.

The Canadian C-spine assessment includes evaluating for tenderness along the midline of the spine, checking for any abnormal sensations in the limbs, and assessing the ability to rotate the neck 45 degrees to the left and right. While a significant portion of the assessment relies on gathering information from the patient’s history, there are also physical examination components involved. These include testing for tenderness along the midline of the cervical spine, asking the patient to perform neck rotations, ensuring they are comfortable in a sitting position, and assessing for any sensory deficits in the limbs. It is important to note that any reported paraesthesia in the upper or lower limbs can also be taken into consideration during the assessment.

Further Reading:

When assessing for cervical spine injury, it is recommended to use the Canadian C-spine rules. These rules help determine the risk level for a potential injury. High-risk factors include being over the age of 65, experiencing a dangerous mechanism of injury (such as a fall from a height or a high-speed motor vehicle collision), or having paraesthesia in the upper or lower limbs. Low-risk factors include being involved in a minor rear-end motor vehicle collision, being comfortable in a sitting position, being ambulatory since the injury, having no midline cervical spine tenderness, or experiencing a delayed onset of neck pain. If a person is unable to actively rotate their neck 45 degrees to the left and right, their risk level is considered low. If they have one of the low-risk factors and can actively rotate their neck, their risk level remains low.

If a high-risk factor is identified or if a low-risk factor is identified and the person is unable to actively rotate their neck, full in-line spinal immobilization should be maintained and imaging should be requested. Additionally, if a patient has risk factors for thoracic or lumbar spine injury, imaging should be requested. However, if a patient has low-risk factors for cervical spine injury, is pain-free, and can actively rotate their neck, full in-line spinal immobilization and imaging are not necessary.

NICE recommends CT as the primary imaging modality for cervical spine injury in adults aged 16 and older, while MRI is recommended as the primary imaging modality for children under 16.

Different mechanisms of spinal trauma can cause injury to the spine in predictable ways. The majority of cervical spine injuries are caused by flexion combined with rotation. Hyperflexion can result in compression of the anterior aspects of the vertebral bodies, stretching and tearing of the posterior ligament complex, chance fractures (also known as seatbelt fractures), flexion teardrop fractures, and odontoid peg fractures. Flexion and rotation can lead to disruption of the posterior ligament complex and posterior column, fractures of facet joints, lamina, transverse processes, and vertebral bodies, and avulsion of spinous processes. Hyperextension can cause injury to the anterior column, anterior fractures of the vertebral body, and potential retropulsion of bony fragments or discs into the spinal canal. Rotation can result in injury to the posterior ligament complex and facet joint dislocation.

Balanitis is the inflammation of the glans, which is the end of the penis. It often occurs alongside inflammation of the foreskin. Balanitis is a common condition that can affect individuals of any age. However, it is most commonly seen in boys under the age of four who have not undergone circumcision. The main symptoms include redness, irritation, and soreness of the glans. In some cases, it may be difficult to retract the foreskin, and there may be discomfort during urination.

There are various factors that can cause balanitis. These include poor hygiene, a non-retractile foreskin condition called phimosis, dermatological conditions like psoriasis, infections such as candidal infection, and allergies. In most cases, balanitis can be diagnosed based on clinical examination. However, if there is uncertainty, a swab may be taken for further investigation.

Treatment for balanitis involves practicing good hygiene and gently cleaning the affected area. If a candidal infection is suspected, clotrimazole may be used. Additionally, a mild steroid cream is often prescribed to reduce inflammation. In cases where recurrent balanitis is caused by phimosis, circumcision may be considered as a potential treatment option.

Multiple myeloma is a cancerous growth of plasma cells, a type of white blood cell responsible for producing antibodies. It is more prevalent in men and typically occurs in individuals over the age of 60.

When a patient over 60 presents with an elevated ESR, unexplained anemia, hypercalcemia, renal impairment, and bone pain, the initial diagnosis is usually multiple myeloma until proven otherwise.

The most common symptoms of multiple myeloma include:

1. Anemia: This is caused by the infiltration of the bone marrow and suppression of blood cell production. It is typically normocytic and normochromic, but can also be macrocytic.

2. Bone pain: Approximately 70% of patients experience bone pain, which commonly affects the spine and ribs. Localized pain and tenderness may indicate a pathological fracture, and vertebral fractures can lead to spinal cord compression.

3. Renal failure: Acute or chronic renal failure occurs in about one-third of patients. This is generally due to the effects of light chains on the tubules.

4. Neurological symptoms: Hypercalcemia can cause weakness, lethargy, and confusion, while hyperviscosity can result in headaches and retinopathy. Amyloid infiltration can lead to peripheral neuropathies, with carpal tunnel syndrome being the most common.

5. Infection: The most common infections seen in multiple myeloma patients are pyelonephritis and pneumonia.

In addition to the routine blood tests already conducted, a suspected diagnosis of multiple myeloma should prompt further investigations, including:

– Plasma viscosity measurement
– Urinary protein electrophoresis to detect Bence-Jones proteins
– Serum electrophoresis to identify the type of paraprotein
– Quantitative immunoglobulin level testing
– Skeletal survey to look for lytic lesions
– Bone marrow aspirate and possibly biopsy

A diagnosis of multiple myeloma is confirmed by the presence of a monoclonal protein in the serum or urine, lytic lesions on X-ray, and an increased number of plasma cells in the bone marrow.

Slipped upper femoral epiphysis (SUFE), also referred to as slipped capital femoral epiphysis, is a rare but significant hip disorder that primarily affects children. It occurs when the growth plate slips at the epiphysis, causing the head of the femur to shift from its normal position on the femoral neck. Specifically, the femoral epiphysis remains in the acetabulum while the metaphysis moves forward and externally rotates.

SUFE typically presents later in boys, usually between the ages of 10 and 17, compared to girls who typically experience it between 8 and 15 years of age. Several risk factors contribute to its development, including being male, being overweight, having immature skeletal maturity, having a positive family history, being of Pacific Island or African origin, having hypothyroidism, growth hormone deficiency, or hypogonadism.

Patients with SUFE commonly experience hip pain and a limp. In severe cases, a leg length discrepancy may be noticeable. While the condition may not be immediately apparent on an anteroposterior (AP) film, it is usually detectable on a frog-leg lateral film. A diagnostic sign is the failure of a line drawn up the lateral edge of the femoral neck (known as the line of Klein) to intersect the epiphysis during the acute stage, also known as Trethowan’s sign.

Surgical pinning is the most common treatment for SUFE. In approximately 20% of cases, bilateral SUFE occurs, prompting some surgeons to recommend prophylactic pinning of the unaffected hip. If a significant deformity is present, osteotomies or even arthroplasty may be necessary.

When starting treatment with strong opioids for pain relief in palliative care, it is recommended to offer patients regular oral sustained-release or oral immediate-release morphine, depending on their preference. In addition, provide rescue doses of oral immediate-release morphine for breakthrough pain. For patients without renal or hepatic comorbidities, a typical total daily starting dose schedule of 20-30 mg of oral morphine is suggested, along with 5 mg of oral immediate-release morphine for rescue doses during the titration phase. It is important to adjust the dose until a good balance is achieved between pain control and side effects. If this balance is not reached after a few dose adjustments, it is advisable to seek specialist advice. Patients should be reviewed frequently, especially during the titration phase. For patients with moderate to severe renal or hepatic impairment, it is recommended to consult a specialist before prescribing strong opioids.

For maintenance therapy, oral sustained-release morphine is recommended as the first-line treatment for patients with advanced and progressive disease who require strong opioids. Transdermal patch formulations should not be routinely offered as first-line maintenance treatment unless oral opioids are not suitable. If pain remains inadequately controlled despite optimizing first-line maintenance treatment, it is important to review the analgesic strategy and consider seeking specialist advice.

When it comes to breakthrough pain, oral immediate-release morphine should be offered as the first-line rescue medication for patients on maintenance oral morphine treatment. Fast-acting fentanyl should not be offered as the first-line rescue medication. If pain continues to be inadequately controlled despite optimizing treatment, it may be necessary to seek specialist advice.

In cases where oral opioids are not suitable and analgesic requirements are stable, transdermal patches with the lowest acquisition cost can be considered. However, it is important to consult a specialist for guidance if needed. Similarly, for patients in whom oral opioids are not suitable and analgesic requirements are unstable, subcutaneous opioids with the lowest acquisition cost can be considered, with specialist advice if necessary.

For more information, please refer to the NICE Clinical Knowledge Summary: Opioids for pain relief in palliative care. https://www.nice.org.uk/guidance/cg140

The initial stage of SJS is characterized by a rash on the skin, specifically on the macular area. As the condition progresses, the rash transforms into blisters, known as bullae, which eventually detach from the skin.

Further Reading:

Stevens-Johnson syndrome (SJS) and toxic epidermal necrolysis (TEN) are severe mucocutaneous immune reactions characterized by blistering skin rash and erosions/ulceration of mucous membranes. SJS has less than 10% total body surface area (TBSA) involvement, SJS/TEN overlap has 10% to 30% TBSA involvement, and TEN has more than 30% TBSA involvement. The exact cause of SJS and TEN is not well understood, but it is believed to be a T-cell–mediated cytotoxic reaction triggered by drugs, infections, or vaccinations. Drugs are responsible for 50% of SJS cases and up to 95% of TEN cases, with antibiotics and anticonvulsants being the most common culprits.

The clinical features of SJS and TEN include a prodrome of malaise, fever, headache, and cough, followed by the appearance of small pink-red macules with darker centers. These macules can coalesce and develop into larger blisters (bullae) that eventually break and cause the epidermis to slough off. Painful mucosal erosions can also occur, affecting various parts of the body and leading to complications such as renal failure, hepatitis, pneumonia, and urethritis. Nikolsky’s sign, which refers to the easy sloughing off of the epidermal layer with pressure, is a characteristic feature of SJS and TEN.

The diagnosis of SJS, SJS/TEN overlap, and TEN can be confirmed through a skin biopsy, which typically shows desquamation at the epidermal-papillary dermal junction and the presence of necrotic epithelium and lymphocytes. Management of SJS and TEN involves supportive care, withdrawal of the causative agent if drug-related, monitoring for metabolic derangement and infection, maintaining the airway, treating respiratory function and pneumonia, fluid resuscitation, wound care, analgesia, and nutritional support. Ophthalmology consultation is also recommended. Intravenous immunoglobulin, ciclosporin, corticosteroids, and plasmapheresis may be used in treatment, but there is limited evidence supporting their effectiveness.

The prognosis of SJS and TEN can be assessed using the SCORTEN score, which comprises of 7 clinical and biological parameters, with the predicted probability of mortality ranging from 3.2% to 90.0%.

Patients with Parkinson’s disease (PD) typically exhibit the following clinical features:

– Hypokinesia (reduced movement)
– Bradykinesia (slow movement)
– Rest tremor (usually occurring at a rate of 4-6 cycles per second)
– Rigidity (increased muscle tone and ‘cogwheel rigidity’)

Other commonly observed clinical features include:

– Gait disturbance (characterized by a shuffling gait and loss of arm swing)
– Loss of facial expression
– Monotonous, slurred speech
– Micrographia (small, cramped handwriting)
– Increased salivation and dribbling
– Difficulty with fine movements

Initially, these signs are typically seen on one side of the body at the time of diagnosis, but they progressively worsen and may eventually affect both sides. In later stages of the disease, additional clinical features may become evident, including:

– Postural instability
– Cognitive impairment
– Orthostatic hypotension

Although PD primarily affects movement, patients often experience psychiatric issues such as depression and dementia. Autonomic disturbances and pain can also occur, leading to significant disability and reduced quality of life for the affected individual. Additionally, family members and caregivers may also be indirectly affected by the disease.

Prolonged QRS duration is associated with an increased risk of seizures and arrhythmia. Therefore, when QRS prolongation is observed, it is recommended to consider initiating treatment with sodium bicarbonate.

Further Reading:

Tricyclic antidepressant (TCA) overdose is a common occurrence in emergency departments, with drugs like amitriptyline and dosulepin being particularly dangerous. TCAs work by inhibiting the reuptake of norepinephrine and serotonin in the central nervous system. In cases of toxicity, TCAs block various receptors, including alpha-adrenergic, histaminic, muscarinic, and serotonin receptors. This can lead to symptoms such as hypotension, altered mental state, signs of anticholinergic toxicity, and serotonin receptor effects.

TCAs primarily cause cardiac toxicity by blocking sodium and potassium channels. This can result in a slowing of the action potential, prolongation of the QRS complex, and bradycardia. However, the blockade of muscarinic receptors also leads to tachycardia in TCA overdose. QT prolongation and Torsades de Pointes can occur due to potassium channel blockade. TCAs can also have a toxic effect on the myocardium, causing decreased cardiac contractility and hypotension.

Early symptoms of TCA overdose are related to their anticholinergic properties and may include dry mouth, pyrexia, dilated pupils, agitation, sinus tachycardia, blurred vision, flushed skin, tremor, and confusion. Severe poisoning can lead to arrhythmias, seizures, metabolic acidosis, and coma. ECG changes commonly seen in TCA overdose include sinus tachycardia, widening of the QRS complex, prolongation of the QT interval, and an R/S ratio >0.7 in lead aVR.

Management of TCA overdose involves ensuring a patent airway, administering activated charcoal if ingestion occurred within 1 hour and the airway is intact, and considering gastric lavage for life-threatening cases within 1 hour of ingestion. Serial ECGs and blood gas analysis are important for monitoring. Intravenous fluids and correction of hypoxia are the first-line therapies. IV sodium bicarbonate is used to treat haemodynamic instability caused by TCA overdose, and benzodiazepines are the treatment of choice for seizure control. Other treatments that may be considered include glucagon, magnesium sulfate, and intravenous lipid emulsion.

There are certain things to avoid in TCA overdose, such as anti-arrhythmics like quinidine and flecainide, as they can prolonged depolarization.

The GCS scoring system evaluates a patient’s level of consciousness based on three criteria: eye opening, verbal response, and motor response. Each criterion is assigned a score, and the total score determines the patient’s GCS score. For example, if a patient has a GCS score of 10 (E3 V2 M5), it means they scored 3 out of 4 in eye opening, 2 out of 5 in verbal response, and 5 out of 6 in motor response.

Further Reading:

A subdural hematoma (SDH) is a condition where there is a collection of blood between the dura mater and the arachnoid mater of the brain. It occurs when the cortical bridging veins tear and bleed into the subdural space. Risk factors for SDH include head trauma, cerebral atrophy, advancing age, alcohol misuse, and certain medications or bleeding disorders. SDH can be classified as acute, subacute, or chronic depending on its age or speed of onset. Acute SDH is typically the result of head trauma and can progress to become chronic if left untreated.

The clinical presentation of SDH can vary depending on the nature of the condition. In acute SDH, patients may initially feel well after a head injury but develop more serious neurological symptoms later on. Chronic SDH may be detected after a CT scan is ordered to investigate confusion or cognitive decline. Symptoms of SDH can include increasing confusion, progressive decline in neurological function, seizures, headache, loss of consciousness, and even death.

Management of SDH involves an ABCDE approach, seizure management, confirming the diagnosis with CT or MRI, checking clotting and correcting coagulation abnormalities, managing raised intracranial pressure, and seeking neurosurgical opinion. Some SDHs may be managed conservatively if they are small, chronic, the patient is not a good surgical candidate, and there are no neurological symptoms. Neurosurgical intervention typically involves a burr hole craniotomy to decompress the hematoma. In severe cases with high intracranial pressure and significant brain swelling, a craniectomy may be performed, where a larger section of the skull is removed and replaced in a separate cranioplasty procedure.

CT imaging can help differentiate between subdural hematoma and other conditions like extradural hematoma. SDH appears as a crescent-shaped lesion on CT scans.

NSAIDs are known to have a relaxing effect on the ureter, but a randomized controlled trial found no difference between NSAIDs and a placebo in terms of this effect. Currently, only two classes of drugs, calcium channel blockers and alpha-blockers, are considered effective as medical expulsive therapy (MET). Calcium channel blockers work by blocking the active calcium channel pump that the smooth muscle of the ureter uses to contract, resulting in relaxation of the muscle and improved stone passage. Alpha-blockers, on the other hand, are commonly used as the first-line treatment to enhance stone passage. They reduce the basal tone of the ureter smooth muscle, decrease the frequency of peristaltic waves, and lower ureteric contraction. This leads to a decrease in intraureteric pressure below the stone, increasing the chances of stone passage. Patients treated with calcium channel blockers or alpha-blockers have been shown to have a 65% higher likelihood of spontaneous stone passage compared to those not given these medications.

An advance decision, also known as an advance directive in Scotland, is a statement made by a patient expressing their desire to refuse certain types of medical treatment or care in the event that they become unable to make or communicate decisions for themselves. These statements serve as a means of effectively communicating the patient’s wishes to healthcare professionals and family members, helping to avoid any confusion that may arise. If a patient reaches a point where they are no longer capable of making informed decisions about their care, an advance decision can provide clarity and guidance.

An advance decision can typically be utilized in the following situations: making decisions regarding CPR, determining the use of IV fluids and parenteral nutrition, deciding on specific procedures, and addressing the use of blood products for Jehovah’s Witnesses. However, it is important to note that advance decisions have their limitations and cannot be used to grant a relative lasting power of attorney, appoint a spokesperson to make decisions on the patient’s behalf, request a specific medical treatment, advocate for something illegal (such as assisted suicide), refuse treatment for a mental health condition, or authorize treatments that are not in the patient’s best interests.

A doctor is legally obligated to adhere to an advance decision unless certain circumstances arise. These circumstances include changes that invalidate the decision, advances or changes in treatment that alter the circumstances, ambiguity in the wording of the decision, or if the decision is unsigned or its authenticity is in doubt. If there are any doubts about the validity of an advance decision, it is advisable to seek legal advice. Unfortunately, there have been instances where advance decisions have been forged or signed under duress, and any suspicions of this nature should be raised.

It is important to note that there is no specific time period for which an advance decision remains valid.

The mast cell tryptase test, also known as the tryptase test, is a valuable tool for detecting mast cell activation and confirming the diagnosis of anaphylaxis in cases where there is uncertainty. Tryptase is the primary protein found in mast cells. During anaphylaxis, mast cells release their contents, leading to an increase in blood tryptase levels. Typically, these levels start to rise approximately 30 minutes after symptoms begin, reach their peak at 1-2 hours, and return to normal within 6-8 hours.

For optimal results, it is recommended to collect three timed samples. The first sample should be taken as soon as possible after resuscitation efforts have commenced. The second sample should be obtained 1-2 hours after the onset of symptoms. Lastly, a third sample should be collected at the 24-hour mark to establish a baseline level.

While skin allergy tests, like the patch test, and blood tests for specific IgE can help identify the trigger of an allergic reaction, they alone cannot confirm the occurrence of anaphylaxis. The mast cell tryptase test, on the other hand, provides valuable information in confirming the diagnosis.

Croup is identified by a cough that sounds like a seal barking, especially worse during the night. Before the barking cough, there may be initial symptoms of a cough, runny nose, and congestion for 12 to 72 hours. Other signs of croup include a high-pitched sound when breathing (stridor), difficulty breathing (respiratory distress), and fever.

Further Reading:

Croup, also known as laryngotracheobronchitis, is a respiratory infection that primarily affects infants and toddlers. It is characterized by a barking cough and can cause stridor (a high-pitched sound during breathing) and respiratory distress due to swelling of the larynx and excessive secretions. The majority of cases are caused by parainfluenza viruses 1 and 3. Croup is most common in children between 6 months and 3 years of age and tends to occur more frequently in the autumn.

The clinical features of croup include a barking cough that is worse at night, preceded by symptoms of an upper respiratory tract infection such as cough, runny nose, and congestion. Stridor, respiratory distress, and fever may also be present. The severity of croup can be graded using the NICE system, which categorizes it as mild, moderate, severe, or impending respiratory failure based on the presence of symptoms such as cough, stridor, sternal/intercostal recession, agitation, lethargy, and decreased level of consciousness. The Westley croup score is another commonly used tool to assess the severity of croup based on the presence of stridor, retractions, air entry, oxygen saturation levels, and level of consciousness.

In cases of severe croup with significant airway obstruction and impending respiratory failure, symptoms may include a minimal barking cough, harder-to-hear stridor, chest wall recession, fatigue, pallor or cyanosis, decreased level of consciousness, and tachycardia. A respiratory rate over 70 breaths per minute is also indicative of severe respiratory distress.

Children with moderate or severe croup, as well as those with certain risk factors such as chronic lung disease, congenital heart disease, neuromuscular disorders, immunodeficiency, age under 3 months, inadequate fluid intake, concerns about care at home, or high fever or a toxic appearance, should be admitted to the hospital. The mainstay of treatment for croup is corticosteroids, which are typically given orally. If the child is too unwell to take oral medication, inhaled budesonide or intramuscular dexamethasone may be used as alternatives. Severe cases may require high-flow oxygen and nebulized adrenaline.

When considering the differential diagnosis for acute stridor and breathing difficulty, non-infective causes such as inhaled foreign bodies

The most appropriate course of action would be to adhere to the Fraser guidelines. These guidelines consider whether a child under the age of 16 possesses the maturity and understanding to make a reasonable assessment of the benefits and drawbacks of the proposed treatment. They were established following the 1982 Gillick case, which dealt with the prescription of contraception for individuals under 16 years old.

It may also be important to gather more information about the patient’s partner, given her age. However, this is not as crucial as the aforementioned response. It is possible that she may require reassurance regarding the confidentiality of her medical information. However, if her partner is an adult or holds a position of authority, there are circumstances in which breaching confidentiality may be necessary in her best interests.

Requesting that a colleague see her is a potential option, but it does not involve taking on any responsibility yourself. A better approach would have been to discuss the case with a colleague while still being involved in the process.

Insisting that she inform a responsible adult would be a threat to breach her confidentiality, which could have serious implications for any future doctor-patient relationship. It would be wise to suggest that she discuss her situation with a responsible adult, but you cannot compel her to do so.

Refusing to prescribe would be the worst choice, as it neglects the patient’s treatment and fails to consider the potential consequences of her becoming pregnant against her wishes.

The median nerve originates from the lateral and medial cords of the brachial plexus and receives contributions from the ventral roots of C5-C7 (lateral cord) and C8 and T1 (medial cord). It serves both motor and sensory functions.

In terms of motor function, the median nerve innervates the flexor muscles in the anterior compartment of the forearm, excluding the flexor carpi ulnaris and a portion of the flexor digitorum profundus, which are instead innervated by the ulnar nerve. Additionally, it innervates the thenar muscles and the lateral two lumbricals.

Regarding sensory function, the median nerve gives rise to the palmar cutaneous branch, which provides innervation to the lateral part of the palm. It also gives rise to the digital cutaneous branch, which innervates the lateral three and a half fingers on the palmar surface of the hand.

Within the forearm, the median nerve branches into two major branches. The first is the anterior interosseous nerve (AIN), which supplies the flexor pollicis longus, pronator quadratus, and the lateral half of the flexor digitorum profundus. The second is the palmar cutaneous branch, which provides sensory innervation to the skin of the radial palm.

Differentiating between damage to the median nerve at the elbow and wrist can be done by considering these two branches. Injury at the elbow affects these branches, while injury at the wrist spares them. It is important to note that the palmar cutaneous branch travels superficially to the flexor retinaculum and therefore remains functional in carpal tunnel syndrome. However, it can be damaged by laceration at the wrist.

A comparison of median nerve lesions at the wrist and elbow is presented below:

Median nerve at elbow:
– Motor loss: Weak wrist flexion and abduction, loss of thumb abduction and opposition, loss of flexion of index and middle fingers
– Sensory loss: Lateral 3 and ½ fingers and nail beds, lateral side of palm
– Hand deformity: Ulnar deviation of wrist, thenar wasting, papal benediction on flexing fingers

Median nerve at wrist:
– Motor loss: Loss of thumb abduction and opposition, wrist and finger flexion intact (due to intact AIN)
– Sensory loss: Lateral 3 and ½ fingers and nail beds, lateral side of palm (but can be preserved depending upon palmar cutaneous branch)
– Hand deformity: Thenar wasting, no ulnar deviation of wrist or papal benediction (due to intact AIN)

The qCSI Score, also known as the Quick COVID-19 Severity Index, is a tool that can predict the risk of critical respiratory illness in patients who are admitted from the emergency department with COVID-19. This score takes into consideration three criteria: respiratory rate, pulse oximetry, and oxygen flow rate. By assessing these factors, the qCSI Score can provide an estimation of the 24-hour risk of severe respiratory complications in these patients.

On the other hand, the qSOFA Score is a different tool that is used to identify high-risk patients for in-hospital mortality when there is a suspicion of infection, particularly in cases of sepsis. However, it is important to note that the qSOFA Score is not specifically designed for use in the setting of febrile neutropenia.

Another scoring system, known as the CURB-65 Score, is utilized to estimate the mortality risk associated with community-acquired pneumonia. This score helps healthcare professionals determine whether a patient should receive inpatient or outpatient treatment based on their likelihood of experiencing adverse outcomes.

Lastly, the SCAP Score is a scoring system that predicts the risk of adverse outcomes in patients with community-acquired pneumonia who present to the emergency department. By assessing various clinical factors, this score can provide valuable information to healthcare providers regarding the potential severity of the illness and the need for further intervention.

In addition to these scores, there is also the MASCC Risk Index Score, which is specifically used in the context of cancer patients receiving supportive care. This score helps assess the risk of complications in this vulnerable population and aids in making informed decisions regarding their treatment and management.

Acute pancreatitis is a common and serious cause of acute abdominal pain. It occurs when the pancreas becomes inflamed, leading to the release of enzymes that cause the organ to digest itself. The symptoms of acute pancreatitis include severe epigastric pain, nausea, vomiting, and pain that may radiate to the T6-T10 dermatomes or shoulder tip due to irritation of the phrenic nerve. Other signs include fever, tenderness in the epigastric area, jaundice, and the presence of Gray-Turner and Cullen signs, which are ecchymosis of the flank and peri-umbilical area, respectively.

To determine the severity of acute pancreatitis, the Ranson criteria are used as a clinical prediction rule. A score greater than three indicates severe pancreatitis with a mortality rate of over 15%. The criteria assessed upon admission include age over 55 years, white cell count above 16 x 109/L, blood glucose level higher than 11 mmol/L, serum AST level exceeding 250 IU/L, and serum LDH level surpassing 350 IU/L.

In this particular case, the patient’s Ranson score is three. This is based on the fact that she is 56 years old, her white cell count is 16.7 x 109/L, and her AST level is 358 IU/L.

Isoniazid has the potential to induce acute hepatitis, but it is not considered a known cause of cholestatic jaundice. On the other hand, there are several drugs that have been identified as culprits for cholestatic jaundice. These include nitrofurantoin, erythromycin, cephalosporins, verapamil, NSAIDs, ACE inhibitors, tricyclic antidepressants, phenytoin, azathioprine, carbamazepine, oral contraceptive pills, diazepam, ketoconazole, and tamoxifen. It is important to be aware of these medications and their potential side effects in order to ensure patient safety.

Grey baby syndrome is a rare but serious side effect that can occur in neonates, especially premature babies, as a result of the build-up of the antibiotic chloramphenicol. This condition is characterized by several symptoms, including ashen grey skin color, poor feeding, vomiting, cyanosis, hypotension, hypothermia, hypotonia, cardiovascular collapse, abdominal distension, and respiratory difficulties.

During pregnancy, there are several drugs that can have adverse effects on the developing fetus. ACE inhibitors, such as ramipril, if given in the second and third trimesters, can lead to hypoperfusion, renal failure, and the oligohydramnios sequence. Aminoglycosides, like gentamicin, can cause ototoxicity and deafness. High doses of aspirin can result in first-trimester abortions, delayed onset labor, premature closure of the fetal ductus arteriosus, and fetal kernicterus. However, low doses of aspirin (e.g., 75 mg) do not pose significant risks.

Benzodiazepines, such as diazepam, when administered late in pregnancy, can cause respiratory depression and a neonatal withdrawal syndrome. Calcium-channel blockers, if given in the first trimester, may lead to phalangeal abnormalities, while their use in the second and third trimesters can result in fetal growth retardation. Carbamazepine can cause hemorrhagic disease of the newborn and neural tube defects.

Chloramphenicol, as mentioned earlier, can cause grey baby syndrome. Corticosteroids, if given in the first trimester, may cause orofacial clefts. Danazol, if administered in the first trimester, can cause masculinization of the female fetuses genitals. Pregnant women should avoid handling crushed or broken tablets of finasteride, as it can be absorbed through the skin and affect male sex organ development.

Haloperidol, if given in the first trimester, may cause limb malformations, while its use in the third trimester increases the risk of extrapyramidal symptoms in the neonate. Heparin can lead to maternal bleeding and thrombocytopenia. Isoniazid can cause maternal liver damage and neuropathy and seizures in the neonate. Isotretinoin carries a high risk of teratogenicity, including multiple congenital malformations, spontaneous abortion, and intellectual disability.

This is a classical history for a simple urinary tract infection. The other possible causes mentioned can also result in frank haematuria, but they would be less likely based on the given history.

Bladder cancer typically presents with additional symptoms such as an abdominal mass, weight loss, and fatigue. Nephritis is more likely to cause renal angle tenderness and some systemic upset. It is often preceded by another infection.

Tuberculosis may also have more systemic involvement, although it can present on its own. Renal stones commonly cause severe pain from the loin to the groin and renal angle tenderness.

To ensure prompt response in case of an adverse reaction, it is important to have adrenaline, antihistamine, and steroid readily available when administering Zagreb antivenom.

Further Reading:

Snake bites in the UK are primarily caused by the adder, which is the only venomous snake species native to the country. While most adder bites result in minor symptoms such as pain, swelling, and inflammation, there have been cases of life-threatening illness and fatalities. Additionally, there are instances where venomous snakes that are kept legally or illegally also cause bites in the UK.

Adder bites typically occur from early spring to late autumn, with the hand being the most common site of the bite. Symptoms can be local or systemic, with local symptoms including sharp pain, tingling or numbness, and swelling that spreads proximally. Systemic symptoms may include spreading pain, tenderness, inflammation, regional lymph node enlargement, and bruising. In severe cases, anaphylaxis can occur, leading to symptoms such as nausea, vomiting, abdominal pain, diarrhea, and shock.

It is important for clinicians to be aware of the potential complications and complications associated with adder bites. These can include acute renal failure, pulmonary and cerebral edema, acute gastric dilatation, paralytic ileus, acute pancreatitis, and coma and seizures. Anaphylaxis symptoms can appear within minutes or be delayed for hours, and hypotension is a critical sign to monitor.

Initial investigations for adder bites include blood tests, ECG, and vital sign monitoring. Further investigations such as chest X-ray may be necessary based on clinical signs. Blood tests may reveal abnormalities such as leukocytosis, raised hematocrit, anemia, thrombocytopenia, and abnormal clotting profile. ECG changes may include tachyarrhythmias, bradyarrhythmias, atrial fibrillation, and ST segment changes.

First aid measures at the scene include immobilizing the patient and the bitten limb, avoiding aspirin and ibuprofen, and cleaning the wound site in the hospital. Tetanus prophylaxis should be considered. In cases of anaphylaxis, prompt administration of IM adrenaline is necessary. In the hospital, rapid assessment and appropriate resuscitation with intravenous fluids are required.

Antivenom may be indicated in cases of hypotension, systemic envenoming, ECG abnormalities, peripheral neutrophil leucocytosis, elevated serum creatine kinase or metabolic acidosis, and extensive or rapidly spreading local swelling. Zagreb antivenom is commonly used in the UK, with an initial dose of 8 mL.

The Parkinson-plus syndromes are a group of neurodegenerative disorders that share similar features with Parkinson’s disease but also have additional clinical characteristics that set them apart from idiopathic Parkinson’s disease (iPD). These syndromes include Multiple System Atrophy (MSA), Progressive Supranuclear Palsy (PSP), Corticobasal degeneration (CBD), and Dementia with Lewy Bodies (DLB).

Multiple System Atrophy (MSA) is a less common condition than iPD and PSP. It is characterized by the loss of cells in multiple areas of the nervous system. MSA progresses rapidly, often leading to wheelchair dependence within 3-4 years of diagnosis. Some distinguishing features of MSA include autonomic dysfunction, bladder control problems, erectile dysfunction, blood pressure changes, early-onset balance problems, neck or facial dystonia, and a high-pitched voice.

To summarize the distinguishing features of the Parkinson-plus syndromes compared to iPD, the following table provides a comparison:

iPD:
– Symptom onset: One side of the body affected more than the other
– Tremor: Typically starts at rest on one side of the body
– Levodopa response: Excellent response
– Mental changes: Depression
– Balance/falls: Late in the disease
– Common eye abnormalities: Dry eyes, trouble focusing

MSA:
– Symptom onset: Both sides equally affected
– Tremor: Not common but may occur
– Levodopa response: Minimal response (but often tried in early stages of disease)
– Mental changes: Depression
– Balance/falls: Within 1-3 years
– Common eye abnormalities: Dry eyes, trouble focusing

PSP:
– Symptom onset: Both sides equally affected
– Tremor: Less common, if present affects both sides
– Levodopa response: Minimal response (but often tried in early stages of disease)
– Mental changes: Personality changes, depression
– Balance/falls: Within 1 year
– Common eye abnormalities: Dry eyes, difficulty in looking downwards

CBD:
– Symptom onset: One side of the body affected more than the other
– Tremor: Not common but may occur
– Levodopa response: Minimal response (but often tried in early stages of disease)
– Mental changes: Depression
– Balance/falls: Within 1-3 years
– Common eye abnormalities: Dry eyes, trouble focusing

Pernicious anaemia is a condition that affects the stomach and is characterized by the loss of gastric parietal cells and impaired secretion of intrinsic factor (IF). IF is crucial for the absorption of vitamin B12 in the ileum, and as a result, megaloblastic anaemia occurs. This condition is commonly seen in individuals who have undergone gastrectomy.

The clinical manifestations of pernicious anaemia include weight loss, loss of appetite, fatigue, diarrhoea, and a distinct lemon-yellow skin color, which is caused by a combination of haemolytic jaundice and the paleness associated with anaemia. Other symptoms may include glossitis (inflammation of the tongue) and oral ulceration. Neurological symptoms can also occur, such as subacute combined degeneration of the spinal cord and peripheral neuropathy. The earliest sign of central nervous system involvement is often the loss of position and vibratory sense in the extremities.

When investigating pernicious anaemia, certain findings may be observed. These include macrocytic anaemia, neutropaenia, thrombocytopaenia, anisocytosis and poikilocytosis on a blood film, low serum B12 levels, elevated serum bilirubin levels (indicating haemolysis), the presence of intrinsic factor antibodies, and a positive Schilling test.

The treatment for pernicious anaemia involves lifelong supplementation of vitamin B12, typically administered through intramuscular injections.

Anterior uveitis refers to the inflammation of the iris and is characterized by a painful and red eye. It is often accompanied by symptoms such as sensitivity to light, excessive tearing, and a decrease in visual clarity. In less than 10% of cases, the inflammation may extend to the posterior chamber. The condition can also lead to the formation of adhesions between the iris and the lens or cornea, resulting in an irregularly shaped pupil known as synechia. In severe cases, pus may accumulate in the front part of the eye, specifically the anterior chamber, causing a condition called hypopyon.

There are various factors that can cause anterior uveitis, including idiopathic cases where no specific cause can be identified. Other causes include trauma, chronic joint diseases like spondyloarthropathies and juvenile chronic arthritis, ankylosing spondylitis, inflammatory bowel disease, psoriasis, sarcoidosis, and infections such as Lyme disease, tuberculosis, leptospirosis, herpes simplex virus (HSV), and varicella-zoster virus (VZV). It is worth noting that approximately 50% of patients with anterior uveitis have a strong association with the HLA-B27 genotype.

Complications that can arise from uveitis include the development of cataracts, glaucoma, band keratopathy (a condition where calcium deposits form on the cornea), and even blindness.

The management of anaphylaxis involves several important steps. First and foremost, it is crucial to ensure proper airway management. Additionally, early administration of adrenaline is essential, preferably in the anterolateral aspect of the middle third of the thigh. Aggressive fluid resuscitation is also necessary. In severe cases, intubation may be required. However, it is important to note that the administration of chlorpheniramine and hydrocortisone should only be considered after early resuscitation has taken place.

Adrenaline is the most vital medication for treating anaphylactic reactions. It acts as an alpha-adrenergic receptor agonist, which helps reverse peripheral vasodilatation and reduce oedema. Furthermore, its beta-adrenergic effects aid in dilating the bronchial airways, increasing the force of myocardial contraction, and suppressing histamine and leukotriene release. Administering adrenaline as the first drug is crucial, and the intramuscular (IM) route is generally the most effective for most individuals.

The recommended doses of IM adrenaline for different age groups during anaphylaxis are as follows:

– Children under 6 years: 150 mcg (0.15 mL of 1:1000)
– Children aged 6-12 years: 300 mcg (0.3 mL of 1:1000)
– Children older than 12 years: 500 mcg (0.5 mL of 1:1000)
– Adults: 500 mcg (0.5 mL of 1:1000)

The ‘B’ symptoms associated with Hodgkin’s lymphoma include fever, night sweats, and weight loss. Fever is defined as a body temperature exceeding 38 degrees Celsius. Night sweats refer to excessive sweating during sleep. Weight loss is considered significant if it amounts to more than 10% of a person’s body weight over a period of six months. It is important to note that pain after consuming alcohol is a distinctive sign of Hodgkin’s lymphoma, but it is not classified as a ‘B’ symptom. This symptom is relatively rare, occurring in only 2-3% of individuals diagnosed with Hodgkin’s lymphoma.

Amiodarone is recommended to be administered after the third shock in a shockable cardiac arrest (Vf/pVT) while performing chest compressions. The prescribed dose is 300 mg, which should be given as an intravenous bolus. To ensure proper administration, the medication should be diluted in 20 mL of 5% dextrose solution.

In cases where VF/pVT continues after five defibrillation attempts, an additional dose of 150 mg of Amiodarone should be administered. It is important to note that Amiodarone is not suitable for treating PEA or asystole, and its use is specifically indicated for shockable cardiac arrest situations.

This patient has presented with an Addisonian crisis, which is a rare but potentially catastrophic condition if not diagnosed promptly. It is more commonly seen in women than men and typically occurs between the ages of 30 and 50.

Addison’s disease is caused by insufficient production of steroid hormones by the adrenal glands, affecting the production of glucocorticoids, mineralocorticoids, and sex steroids. The main causes of Addison’s disease include autoimmune adrenalitis (accounting for 80% of cases), bilateral adrenalectomy, Waterhouse-Friderichsen syndrome (hemorrhage into the adrenal glands), and tuberculosis.

The most common trigger for an Addisonian crisis in patients with Addison’s disease is the intentional or accidental withdrawal of steroid therapy. Other factors that can precipitate a crisis include infection, trauma, myocardial infarction, cerebral infarction, asthma, hypothermia, and alcohol abuse.

Clinical features of Addison’s disease include weakness, lethargy, hypotension (especially orthostatic hypotension), nausea, vomiting, weight loss, reduced axillary and pubic hair, depression, and hyperpigmentation (particularly in palmar creases, buccal mucosa, and exposed areas). In an Addisonian crisis, the main symptoms are usually hypoglycemia and shock, characterized by tachycardia, peripheral vasoconstriction, hypotension, altered consciousness, and even coma.

Biochemical markers of Addison’s disease typically include increased ACTH levels (as a compensatory response to stimulate the adrenal glands), elevated serum renin levels, hyponatremia, hyperkalemia, hypercalcemia, hypoglycemia, and metabolic acidosis. Confirmatory investigations may involve the Synacthen test, plasma ACTH level measurement, plasma renin level measurement, and testing for adrenocortical antibodies.

Management of Addison’s disease should be overseen by an Endocrinologist. Treatment usually involves the administration of hydrocortisone, fludrocortisone, and dehydroepiandrosterone. Some patients may also require thyroxine if there is concurrent hypothalamic-pituitary disease. Treatment is lifelong, and patients should carry a steroid card and MedicAlert bracelet to alert healthcare professionals about their condition and the potential for an Addisonian crisis.

The scalp is primarily supplied with blood from branches of the external carotid artery. The posterior half of the scalp is specifically supplied by three branches of the external carotid artery. These branches are the superficial temporal artery, which supplies blood to the frontal and temporal regions of the scalp, the posterior auricular artery, which supplies blood to the area above and behind the external ear, and the occipital artery, which supplies blood to the back of the scalp.

Further Reading:

The scalp is the area of the head that is bordered by the face in the front and the neck on the sides and back. It consists of several layers, including the skin, connective tissue, aponeurosis, loose connective tissue, and periosteum of the skull. These layers provide protection and support to the underlying structures of the head.

The blood supply to the scalp primarily comes from branches of the external carotid artery and the ophthalmic artery, which is a branch of the internal carotid artery. These arteries provide oxygen and nutrients to the scalp tissues.

The scalp also has a complex venous drainage system, which is divided into superficial and deep networks. The superficial veins correspond to the arterial branches and are responsible for draining blood from the scalp. The deep venous network is drained by the pterygoid venous plexus.

In terms of innervation, the scalp receives sensory input from branches of the trigeminal nerve and the cervical nerves. These nerves transmit sensory information from the scalp to the brain, allowing us to perceive touch, pain, and temperature in this area.

Methaemoglobinaemia is a condition that can occur when prilocaine is used, particularly when administered at doses higher than 16 mg/kg.

Further Reading:

Local anaesthetics, such as lidocaine, bupivacaine, and prilocaine, are commonly used in the emergency department for topical or local infiltration to establish a field block. Lidocaine is often the first choice for field block prior to central line insertion. These anaesthetics work by blocking sodium channels, preventing the propagation of action potentials.

However, local anaesthetics can enter the systemic circulation and cause toxic side effects if administered in high doses. Clinicians must be aware of the signs and symptoms of local anaesthetic systemic toxicity (LAST) and know how to respond. Early signs of LAST include numbness around the mouth or tongue, metallic taste, dizziness, visual and auditory disturbances, disorientation, and drowsiness. If not addressed, LAST can progress to more severe symptoms such as seizures, coma, respiratory depression, and cardiovascular dysfunction.

The management of LAST is largely supportive. Immediate steps include stopping the administration of local anaesthetic, calling for help, providing 100% oxygen and securing the airway, establishing IV access, and controlling seizures with benzodiazepines or other medications. Cardiovascular status should be continuously assessed, and conventional therapies may be used to treat hypotension or arrhythmias. Intravenous lipid emulsion (intralipid) may also be considered as a treatment option.

If the patient goes into cardiac arrest, CPR should be initiated following ALS arrest algorithms, but lidocaine should not be used as an anti-arrhythmic therapy. Prolonged resuscitation may be necessary, and intravenous lipid emulsion should be administered. After the acute episode, the patient should be transferred to a clinical area with appropriate equipment and staff for further monitoring and care.

It is important to report cases of local anaesthetic toxicity to the appropriate authorities, such as the National Patient Safety Agency in the UK or the Irish Medicines Board in the Republic of Ireland. Additionally, regular clinical review should be conducted to exclude pancreatitis, as intravenous lipid emulsion can interfere with amylase or lipase assays.

Methaemoglobinaemia is a condition characterized by various symptoms such as headache, anxiety, acidosis, arrhythmia, seizure activity, reduced consciousness or coma. One notable feature is the presence of brown or chocolate coloured blood. It is important to note that the patient is taking chloroquine, which is a known trigger for methaemoglobinaemia. Additionally, despite the condition, the patient’s arterial blood gas analysis shows a normal partial pressure of oxygen.

Further Reading:

Methaemoglobinaemia is a condition where haemoglobin is oxidised from Fe2+ to Fe3+. This process is normally regulated by NADH methaemoglobin reductase, which transfers electrons from NADH to methaemoglobin, converting it back to haemoglobin. In healthy individuals, methaemoglobin levels are typically less than 1% of total haemoglobin. However, an increase in methaemoglobin can lead to tissue hypoxia as Fe3+ cannot bind oxygen effectively.

Methaemoglobinaemia can be congenital or acquired. Congenital causes include haemoglobin chain variants (HbM, HbH) and NADH methaemoglobin reductase deficiency. Acquired causes can be due to exposure to certain drugs or chemicals, such as sulphonamides, local anaesthetics (especially prilocaine), nitrates, chloroquine, dapsone, primaquine, and phenytoin. Aniline dyes are also known to cause methaemoglobinaemia.

Clinical features of methaemoglobinaemia include slate grey cyanosis (blue to grey skin coloration), chocolate blood or chocolate cyanosis (brown color of blood), dyspnoea, low SpO2 on pulse oximetry (which often does not improve with supplemental oxygen), and normal PaO2 on arterial blood gas (ABG) but low SaO2. Patients may tolerate hypoxia better than expected. Severe cases can present with acidosis, arrhythmias, seizures, and coma.

Diagnosis of methaemoglobinaemia is made by directly measuring the level of methaemoglobin using a co-oximeter, which is present in most modern blood gas analysers. Other investigations, such as a full blood count (FBC), electrocardiogram (ECG), chest X-ray (CXR), and beta-human chorionic gonadotropin (bHCG) levels (in pregnancy), may be done to assess the extent of the condition and rule out other contributing factors.

Active treatment is required if the methaemoglobin level is above 30% or if it is below 30% but the patient is symptomatic or shows evidence of tissue hypoxia. Treatment involves maintaining the airway and delivering high-flow oxygen, removing the causative agents, treating toxidromes and consider giving IV dextrose 5%.

Benzodiazepines are commonly prescribed in the UK to help manage symptoms of alcohol withdrawal. Currently, only diazepam and chlordiazepoxide have been approved for this purpose. If you would like to learn more about the NICE pathway for acute alcohol withdrawal or the RCEM syllabus reference, please refer to the provided links. Additionally, information on alcohol and substance misuse can be found in the MHC1 section.