Ascending cholangitis occurs when there is an infection in the common bile duct, usually caused by a stone that has led to a blockage of bile flow. This condition is known as choledocholithiasis. The typical symptoms of ascending cholangitis are jaundice, fever (often accompanied by chills), and pain in the upper right quadrant of the abdomen. It is important to note that ascending cholangitis is a serious medical emergency that can be life-threatening, as patients often develop sepsis. Approximately 10-20% of patients may also experience altered mental status and low blood pressure due to septic shock. When these additional symptoms are present along with the classic triad of symptoms (Charcot’s triad), it is referred to as Reynold’s pentad. Urgent biliary drainage is the recommended treatment for ascending cholangitis. While a high white blood cell count is commonly seen in this condition, it is not considered part of Reynold’s pentad.

Patients typically initiate dialysis when their glomerular filtration rate (GFR) drops to 10 ml/min. However, if the patient has diabetes, dialysis may be recommended when their GFR reaches 15 ml/min. The GFR is a measure of kidney function and indicates how well the kidneys are able to filter waste products from the blood. Dialysis is a medical procedure that helps perform the function of the kidneys by removing waste and excess fluid from the body.

This patient is likely experiencing an acute coronary syndrome, possibly a non-ST-elevation myocardial infarction (NSTEMI) or unstable angina. The troponin test will help confirm the diagnosis. The patient’s ECG showed ST depression in the inferior leads, but this normalized after treatment with GTN and morphine, ruling out a ST-elevation myocardial infarction (STEMI).

Immediate pain relief should be provided. GTN (sublingual or buccal) can be used, but intravenous opioids like morphine should be considered, especially if a heart attack is suspected.

Aspirin should be given to all patients with unstable angina or NSTEMI as soon as possible and continued indefinitely, unless there are contraindications like bleeding risk or aspirin hypersensitivity. A loading dose of 300 mg should be administered right after presentation.

Fondaparinux should be given to patients without a high bleeding risk, unless coronary angiography is planned within 24 hours of admission. Unfractionated heparin can be an alternative to fondaparinux for patients who will undergo coronary angiography within 24 hours. For patients with significant renal impairment, unfractionated heparin can also be considered, with dose adjustment based on clotting function monitoring.

Routine administration of oxygen is no longer recommended, but oxygen saturation should be monitored using pulse oximetry as soon as possible, preferably before hospital admission. Supplemental oxygen should only be offered to individuals with oxygen saturation (SpO2) below 94% who are not at risk of hypercapnic respiratory failure, aiming for a SpO2 of 94-98%. For individuals with chronic obstructive pulmonary disease at risk of hypercapnic respiratory failure, a target SpO2 of 88-92% should be achieved until blood gas analysis is available.

Bivalirudin, a specific and reversible direct thrombin inhibitor (DTI), is recommended by NICE as a possible treatment for adults with STEMI undergoing percutaneous coronary intervention.

For more information, refer to the NICE guidelines on the assessment and diagnosis of chest pain of recent onset.

The Arthus reaction is a response that occurs when antigen/antibody complexes are formed in the skin after an antigen is injected. Although rare, these reactions can happen after receiving vaccines that contain tetanus toxoid or diphtheria toxoid. They are classified as a type III hypersensitivity reaction.

Arthus reactions are characterized by pain, swelling, induration, hemorrhage, and sometimes necrosis. Typically, these symptoms appear 4-12 hours after vaccination.

Type III hypersensitivity reactions occur when insoluble antigen-antibody complexes accumulate in different tissues and are not effectively cleared by the body’s innate immune cells. This leads to an inflammatory response in the affected tissues.

Some other examples of type III hypersensitivity reactions include immune complex glomerulonephritis, rheumatoid arthritis, systemic lupus erythematosus, serum sickness, and extrinsic allergic alveolitis.

When treating adults with bradycardia, a maximum of 6 doses of atropine 500 mcg can be administered. Each dose is given intravenously every 3-5 minutes. The total dose should not exceed 3mg.

Further Reading:

Causes of Bradycardia:
– Physiological: Athletes, sleeping
– Cardiac conduction dysfunction: Atrioventricular block, sinus node disease
– Vasovagal & autonomic mediated: Vasovagal episodes, carotid sinus hypersensitivity
– Hypothermia
– Metabolic & electrolyte disturbances: Hypothyroidism, hyperkalaemia, hypermagnesemia
– Drugs: Beta-blockers, calcium channel blockers, digoxin, amiodarone
– Head injury: Cushing’s response
– Infections: Endocarditis
– Other: Sarcoidosis, amyloidosis

Presenting symptoms of Bradycardia:
– Presyncope (dizziness, lightheadedness)
– Syncope
– Breathlessness
– Weakness
– Chest pain
– Nausea

Management of Bradycardia:
– Assess and monitor for adverse features (shock, syncope, myocardial ischaemia, heart failure)
– Treat reversible causes of bradycardia
– Pharmacological treatment: Atropine is first-line, adrenaline and isoprenaline are second-line
– Transcutaneous pacing if atropine is ineffective
– Other drugs that may be used: Aminophylline, dopamine, glucagon, glycopyrrolate

Bradycardia Algorithm:
– Follow the algorithm for management of bradycardia, which includes assessing and monitoring for adverse features, treating reversible causes, and using appropriate medications or pacing as needed.
https://acls-algorithms.com/wp-content/uploads/2020/12/Website-Bradycardia-Algorithm-Diagram.pdf

To treat low sodium levels, a solution of sodium chloride is administered. It is important to regularly monitor plasma sodium levels every 2 hours during this treatment, but it is crucial to avoid taking samples from the arm where the IV is inserted. The increase in serum sodium should not exceed 2 mmol/L per hour and should not exceed 8 to 10 mmol/L within a 24-hour period. Hypertonic saline is administered intravenously until neurological symptoms improve.

Further Reading:

Syndrome of inappropriate antidiuretic hormone (SIADH) is a condition characterized by low sodium levels in the blood due to excessive secretion of antidiuretic hormone (ADH). ADH, also known as arginine vasopressin (AVP), is responsible for promoting water and sodium reabsorption in the body. SIADH occurs when there is impaired free water excretion, leading to euvolemic (normal fluid volume) hypotonic hyponatremia.

There are various causes of SIADH, including malignancies such as small cell lung cancer, stomach cancer, and prostate cancer, as well as neurological conditions like stroke, subarachnoid hemorrhage, and meningitis. Infections such as tuberculosis and pneumonia, as well as certain medications like thiazide diuretics and selective serotonin reuptake inhibitors (SSRIs), can also contribute to SIADH.

The diagnostic features of SIADH include low plasma osmolality, inappropriately elevated urine osmolality, urinary sodium levels above 30 mmol/L, and euvolemic. Symptoms of hyponatremia, which is a common consequence of SIADH, include nausea, vomiting, headache, confusion, lethargy, muscle weakness, seizures, and coma.

Management of SIADH involves correcting hyponatremia slowly to avoid complications such as central pontine myelinolysis. The underlying cause of SIADH should be treated if possible, such as discontinuing causative medications. Fluid restriction is typically recommended, with a daily limit of around 1000 ml for adults. In severe cases with neurological symptoms, intravenous hypertonic saline may be used. Medications like demeclocycline, which blocks ADH receptors, or ADH receptor antagonists like tolvaptan may also be considered.

It is important to monitor serum sodium levels closely during treatment, especially if using hypertonic saline, to prevent rapid correction that can lead to central pontine myelinolysis. Osmolality abnormalities can help determine the underlying cause of hyponatremia, with increased urine osmolality indicating dehydration or renal disease, and decreased urine osmolality suggesting SIADH or overhydration.

Le Fort fractures are intricate fractures of the midface, which involve the maxillary bone and the surrounding structures. These fractures can occur in a horizontal, pyramidal, or transverse direction. The distinguishing feature of Le Fort fractures is the separation of the pterygomaxillary due to trauma. They make up approximately 10% to 20% of all facial fractures and can have severe consequences, both in terms of potential life-threatening situations and disfigurement.

The causes of Le Fort fractures vary depending on the type of fracture. Common mechanisms include motor vehicle accidents, sports injuries, assaults, and falls from significant heights. Patients with Le Fort fractures often have concurrent head and cervical spine injuries. Additionally, they frequently experience other facial fractures, as well as neuromuscular injuries and dental avulsions.

The specific type of fracture sustained is determined by the direction of the force applied to the face. Le Fort type I fractures typically occur when a force is directed downward against the upper teeth. Le Fort type II fractures are usually the result of a force applied to the lower or mid maxilla. Lastly, Le Fort type III fractures are typically caused by a force applied to the nasal bridge and upper part of the maxilla.

If a patient’s INR reading is above 5, it is necessary to take action. In this case, the patient’s INR is between 5 and 8, but there is no evidence of bleeding. According to the provided table, it is recommended to temporarily stop 1-2 doses of warfarin and closely monitor the INR. While it may be optional to switch antibiotics, it is not a crucial step in this situation.

Further Reading:

Management of High INR with Warfarin

Major Bleeding:
– Stop warfarin immediately.
– Administer intravenous vitamin K 5 mg.
– Administer 25-50 u/kg four-factor prothrombin complex concentrate.
– If prothrombin complex concentrate is not available, consider using fresh frozen plasma (FFP).
– Seek medical attention promptly.

INR > 8.0 with Minor Bleeding:
– Stop warfarin immediately.
– Administer intravenous vitamin K 1-3mg.
– Repeat vitamin K dose if INR remains high after 24 hours.
– Restart warfarin when INR is below 5.0.
– Seek medical advice if bleeding worsens or persists.

INR > 8.0 without Bleeding:
– Stop warfarin immediately.
– Administer oral vitamin K 1-5 mg using the intravenous preparation orally.
– Repeat vitamin K dose if INR remains high after 24 hours.
– Restart warfarin when INR is below 5.0.
– Seek medical advice if any symptoms or concerns arise.

INR 5.0-8.0 with Minor Bleeding:
– Stop warfarin immediately.
– Administer intravenous vitamin K 1-3mg.
– Restart warfarin when INR is below 5.0.
– Seek medical advice if bleeding worsens or persists.

INR 5.0-8.0 without Bleeding:
– Withhold 1 or 2 doses of warfarin.
– Reduce subsequent maintenance dose.
– Monitor INR closely and seek medical advice if any concerns arise.

Note: In cases of intracranial hemorrhage, prothrombin complex concentrate should be considered as it is faster acting than fresh frozen plasma (FFP).

This girl is displaying symptoms and signs that are consistent with a diagnosis of meningococcal septicaemia. It is crucial that she receives urgent antibiotic treatment. If a patient has a penicillin allergy, but not anaphylaxis, a third-generation cephalosporin like cefotaxime may be administered. However, in this particular case, the girl has a documented history of anaphylaxis to penicillin. It is important to note that up to 10% of patients who are allergic to penicillin may experience an adverse reaction to cephalosporins. In situations where there is a true anaphylactic reaction to penicillins, the British National Formulary (BNF) recommends the use of chloramphenicol as an alternative treatment option.

Ketamine primarily works by blocking NMDA receptors, although its complete mechanism of action is not yet fully comprehended. Ongoing research is exploring its impact on various other receptors.

Further Reading:

Procedural sedation is commonly used by emergency department (ED) doctors to minimize pain and discomfort during procedures that may be painful or distressing for patients. Effective procedural sedation requires the administration of analgesia, anxiolysis, sedation, and amnesia. This is typically achieved through the use of a combination of short-acting analgesics and sedatives.

There are different levels of sedation, ranging from minimal sedation (anxiolysis) to general anesthesia. It is important for clinicians to understand the level of sedation being used and to be able to manage any unintended deeper levels of sedation that may occur. Deeper levels of sedation are similar to general anesthesia and require the same level of care and monitoring.

Various drugs can be used for procedural sedation, including propofol, midazolam, ketamine, and fentanyl. Each of these drugs has its own mechanism of action and side effects. Propofol is commonly used for sedation, amnesia, and induction and maintenance of general anesthesia. Midazolam is a benzodiazepine that enhances the effect of GABA on the GABA A receptors. Ketamine is an NMDA receptor antagonist and is used for dissociative sedation. Fentanyl is a highly potent opioid used for analgesia and sedation.

The doses of these drugs for procedural sedation in the ED vary depending on the drug and the route of administration. It is important for clinicians to be familiar with the appropriate doses and onset and peak effect times for each drug.

Safe sedation requires certain requirements, including appropriate staffing levels, competencies of the sedating practitioner, location and facilities, and monitoring. The level of sedation being used determines the specific requirements for safe sedation.

After the procedure, patients should be monitored until they meet the criteria for safe discharge. This includes returning to their baseline level of consciousness, having vital signs within normal limits, and not experiencing compromised respiratory status. Pain and discomfort should also be addressed before discharge.

Wolff-Parkinson-White (WPW) syndrome is a condition that affects the electrical system of the heart. It occurs when there is an abnormal pathway, known as the bundle of Kent, between the atria and the ventricles. This pathway can cause premature contractions of the ventricles, leading to a type of rapid heartbeat called atrioventricular re-entrant tachycardia (AVRT).

In a normal heart rhythm, the electrical signals travel through the bundle of Kent and stimulate the ventricles. However, in WPW syndrome, these signals can cause the ventricles to contract prematurely. This can be seen on an electrocardiogram (ECG) as a shortened PR interval, a slurring of the initial rise in the QRS complex (known as a delta wave), and a widening of the QRS complex.

There are two distinct types of WPW syndrome that can be identified on an ECG. Type A is characterized by predominantly positive delta waves and QRS complexes in the praecordial leads, with a dominant R wave in V1. This can sometimes be mistaken for right bundle branch block (RBBB). Type B, on the other hand, shows predominantly negative delta waves and QRS complexes in leads V1 and V2, and positive in the other praecordial leads, resembling left bundle branch block (LBBB).

Overall, WPW syndrome is a condition that affects the electrical conduction system of the heart, leading to abnormal heart rhythms. It can be identified on an ECG by specific features such as shortened PR interval, delta waves, and widened QRS complex.

The BTS guidelines for acute asthma in children recommend administering oral steroids early in the treatment of asthma attacks. It is advised to give a dose of 20 mg prednisolone for children aged 2–5 years and a dose of 30–40 mg for children over 5 years old. If a child is already taking maintenance steroid tablets, they should receive 2 mg/kg prednisolone, up to a maximum dose of 60 mg. If a child vomits after taking the medication, the dose of prednisolone should be repeated. In cases where a child is unable to keep down orally ingested medication, intravenous steroids should be considered. Typically, treatment for up to three days is sufficient, but the duration of the course should be adjusted based on the time needed for recovery. Tapering off the medication is not necessary unless the steroid course exceeds 14 days. For more information, refer to the BTS/SIGN Guideline on the Management of Asthma.

In adults, urinary alkalinisation is initiated when the salicylate level exceeds 500 mg/L (>3.6 mmol/L). For children, the threshold is set at a salicylate concentration of > 350 mg/L (2.5 mmol/L).

Further Reading:

Salicylate poisoning, particularly from aspirin overdose, is a common cause of poisoning in the UK. One important concept to understand is that salicylate overdose leads to a combination of respiratory alkalosis and metabolic acidosis. Initially, the overdose stimulates the respiratory center, leading to hyperventilation and respiratory alkalosis. However, as the effects of salicylate on lactic acid production, breakdown into acidic metabolites, and acute renal injury occur, it can result in high anion gap metabolic acidosis.

The clinical features of salicylate poisoning include hyperventilation, tinnitus, lethargy, sweating, pyrexia (fever), nausea/vomiting, hyperglycemia and hypoglycemia, seizures, and coma.

When investigating salicylate poisoning, it is important to measure salicylate levels in the blood. The sample should be taken at least 2 hours after ingestion for symptomatic patients or 4 hours for asymptomatic patients. The measurement should be repeated every 2-3 hours until the levels start to decrease. Other investigations include arterial blood gas analysis, electrolyte levels (U&Es), complete blood count (FBC), coagulation studies (raised INR/PTR), urinary pH, and blood glucose levels.

To manage salicylate poisoning, an ABC approach should be followed to ensure a patent airway and adequate ventilation. Activated charcoal can be administered if the patient presents within 1 hour of ingestion. Oral or intravenous fluids should be given to optimize intravascular volume. Hypokalemia and hypoglycemia should be corrected. Urinary alkalinization with intravenous sodium bicarbonate can enhance the elimination of aspirin in the urine. In severe cases, hemodialysis may be necessary.

Urinary alkalinization involves targeting a urinary pH of 7.5-8.5 and checking it hourly. It is important to monitor for hypokalemia as alkalinization can cause potassium to shift from plasma into cells. Potassium levels should be checked every 1-2 hours.

In cases where the salicylate concentration is high (above 500 mg/L in adults or 350 mg/L in children), sodium bicarbonate can be administered intravenously. Hemodialysis is the treatment of choice for severe poisoning and may be indicated in cases of high salicylate levels, resistant metabolic acidosis, acute kidney injury, pulmonary edema, seizures and coma.

Traumatic aortic rupture, also known as traumatic aortic disruption or transection, occurs when the aorta is torn or ruptured due to physical trauma. This condition often leads to sudden death because of severe bleeding. Motor vehicle accidents and falls from great heights are the most common causes of this injury.

The patients with the highest chances of survival are those who have an incomplete tear near the ligamentum arteriosum of the proximal descending aorta, close to where the left subclavian artery branches off. The presence of an intact adventitial layer or contained mediastinal hematoma helps maintain continuity and prevents immediate bleeding and death. If promptly identified and treated, survivors of these injuries can recover. In cases where traumatic aortic rupture leads to sudden death, approximately 50% of patients have damage at the aortic isthmus, while around 15% have damage in either the ascending aorta or the aortic arch.

Initial chest X-rays may show signs consistent with a traumatic aortic injury. However, false-positive and false-negative results can occur, and sometimes there may be no abnormalities visible on the X-ray. Some of the possible X-ray findings include a widened mediastinum, hazy left lung field, obliteration of the aortic knob, fractures of the 1st and 2nd ribs, deviation of the trachea to the right, presence of a pleural cap, elevation and rightward shift of the right mainstem bronchus, depression of the left mainstem bronchus, obliteration of the space between the pulmonary artery and aorta, and deviation of the esophagus or NG tube to the right.

A helical contrast-enhanced CT scan of the chest is the preferred initial investigation for suspected blunt aortic injury. It has proven to be highly accurate, with close to 100% sensitivity and specificity. CT scanning should be performed liberally, as chest X-ray findings can be unreliable. However, hemodynamically unstable patients should not be placed in a CT scanner. If the CT results are inconclusive, aortography or trans-oesophageal echo can be performed for further evaluation.

Immediate surgical intervention is necessary for these injuries. Endovascular repair is the most common method used and has excellent short-term outcomes. Open repair may also be performed depending on the circumstances. It is important to control heart rate and blood pressure during stabilization to reduce the risk of rupture. Pain should be managed with appropriate analgesic

Heat stroke is a condition characterized by a core temperature greater than 40.6°C, accompanied by changes in mental state and varying levels of organ dysfunction. There are two forms of heat stroke: classic non-exertional heat stroke, which occurs during high environmental temperatures and typically affects elderly patients during heat waves, and exertional heat stroke, which occurs during strenuous physical exercise in high environmental temperatures, such as endurance athletes competing in hot conditions. Heat stroke happens when the body’s thermoregulation is overwhelmed by excessive environmental heat, excessive metabolic heat production, and insufficient heat loss.

Several risk factors increase the likelihood of developing heat stroke. These include hot and humid environmental conditions, age (with the elderly and infants being particularly vulnerable), physical factors like obesity, excessive exertion, and dehydration, as well as medical comorbidities such as anorexia, cardiovascular disease, skin conditions, poorly controlled diabetes, Parkinson’s disease, and thyrotoxicosis. Certain drugs, including alcohol, amphetamines, anticholinergics, beta-blockers, cocaine, diuretics, phenothiazines, SSRIs, and sympathomimetics, can also increase the risk of heat stroke.

The typical clinical features of heat stroke include a core temperature greater than 40.6°C. Early signs may include extreme fatigue, headache, syncope, facial flushing, vomiting, and diarrhea. The skin is usually hot and dry, although sweating can occur in around 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. Heat stroke can also lead to cardiovascular dysfunction, such as arrhythmias, hypotension, and shock, respiratory dysfunction including acute respiratory distress syndrome (ARDS), and central nervous system dysfunction, including seizures and coma. If the temperature rises above 41.5°C, multi-organ failure, coagulopathy, and rhabdomyolysis can occur.

Heat cramps, on the other hand, typically present with intense thirst and muscle cramps. Body temperature is often elevated but usually remains below 40°C. Sweating, heat dissipation mechanisms, and cognition are preserved, and there is no neurological impairment.

Heat exhaustion usually precedes heat stroke and, if left untreated, can progress to heat stroke. Heat dissipation is still functioning, and the body temperature is usually below 41°C.

When assessing a patient with epistaxis (nosebleed), it is important to start with a standard ABC assessment, focusing on the airway and hemodynamic status. Even if the bleeding appears to have stopped, it is crucial to evaluate the patient’s condition. If active bleeding is still present and there are signs of hemodynamic compromise, immediate resuscitative and first aid measures should be initiated.

Epistaxis should be treated as a circulatory emergency, especially in elderly patients, those with clotting disorders or bleeding tendencies, and individuals taking anticoagulants. In these cases, it is necessary to establish intravenous access using at least an 18-gauge (green) cannula. Blood samples, including a full blood count, urea and electrolytes, clotting profile, and group and save (depending on the amount of blood loss), should be sent for analysis. Patients should be assigned to a majors or closely observed area, as dislodgement of a blood clot can lead to severe bleeding.

First aid measures to control bleeding include the following steps:
1. The patient should be seated upright with their body tilted forward and their mouth open. Lying down should be avoided, unless the patient feels faint or there is evidence of hemodynamic compromise. Leaning forward helps reduce the flow of blood into the nasopharynx.
2. The patient should be encouraged to spit out any blood that enters the throat and advised not to swallow it.
3. Firmly pinch the soft, cartilaginous part of the nose, compressing the nostrils for 10-15 minutes. Pressure should not be released, and the patient should breathe through their mouth.
4. If the patient is unable to comply, an alternative technique is to ask a relative, staff member, or use an external pressure device like a swimmer’s nose clip.
5. It is important to dispel the misconception that compressing the bones will help stop the bleeding. Applying ice to the neck or forehead does not influence nasal blood flow. However, sucking on an ice cube or applying an ice pack directly to the nose may reduce nasal blood flow.

If bleeding stops with first aid measures, it is recommended to apply a topical antiseptic preparation to reduce crusting and vestibulitis. Naseptin cream (containing chlorhexidine and neomycin) is commonly used and should be applied to the nostrils four times daily for 10 days.

Patients who have experienced a stroke should be aware that they are not allowed to drive for at least one month if they have a type 1 license. If there are no neurological issues after this time period, they may not need to inform the DVLA (Driver and Vehicle Licensing Agency). However, they must inform the DVLA if any of the following conditions apply: they have had more than one stroke or transient ischemic attack (TIA), they have a Group 2 license, a medical practitioner has expressed concerns about their ability to drive, they still have residual deficits one month after the stroke (such as weakness in the limbs, visual problems, coordination difficulties, memory or understanding issues), the stroke required neurosurgical treatment, or if they experienced a seizure (unless it was an isolated seizure within 24 hours of the stroke and there is no history of prior seizures).

Further Reading:

Blackouts are a common occurrence in the emergency department and can have serious consequences if they happen while a person is driving. It is crucial for doctors in the ED to be familiar with the guidelines set by the DVLA (Driver and Vehicle Licensing Agency) regarding driving restrictions for patients who have experienced a blackout.

The DVLA has specific rules for different types of conditions that may cause syncope (loss of consciousness). For group 1 license holders (car/motorcycle use), if a person has had a first unprovoked isolated seizure, they must refrain from driving for 6 months or 12 months if there is an underlying causative factor that may increase the risk. They must also notify the DVLA. For group 2 license holders (bus and heavy goods vehicles), the restrictions are more stringent, with a requirement of 12 months off driving for a first unprovoked isolated seizure and 5 years off driving if there is an underlying causative factor.

For epilepsy or multiple seizures, both group 1 and group 2 license holders must remain seizure-free for 12 months before their license can be considered. They must also notify the DVLA. In the case of a stroke or isolated transient ischemic attack (TIA), group 1 license holders need to refrain from driving for 1 month, while group 2 license holders must wait for 12 months before being re-licensed subject to medical evaluation. Multiple TIAs require 3 months off driving for both groups.

Isolated vasovagal syncope requires no driving restriction for group 1 license holders, but group 2 license holders must refrain from driving for 3 months. Both groups must notify the DVLA. If syncope is caused by a reversible and treated condition, group 1 license holders need 4 weeks off driving, while group 2 license holders require 3 months. In the case of an isolated syncopal episode with an unknown cause, group 1 license holders must refrain from driving for 6 months, while group 2 license holders will have their license refused or revoked for 12 months.

For patients who continue to drive against medical advice, the GMC (General Medical Council) has provided guidance on how doctors should manage the situation. Doctors should explain to the patient why they are not allowed to drive and inform them of their legal duty to notify the DVLA or DVA (Driver and Vehicle Agency in Northern Ireland). Doctors should also record the advice given to the patient in their medical record

Occlusion of the branches of the basilar artery that supply the midbrain leads to the development of Weber’s syndrome. This condition is characterized by contralateral hemiplegia, which affects the limbs, face, and tongue due to damage to the descending motor tracts within the crus cerebri. Additionally, there are ipsilateral deficits in eye motor activity caused by damage to cranial nerve III.

The BTS guidelines for managing acute asthma in children over the age of 2 recommend the following approaches:

Bronchodilator therapy is the first-line treatment for acute asthma. Inhaled β agonists are preferred, and a pmDI + spacer is the recommended option for children with mild to moderate asthma. It is important to individualize drug dosing based on the severity of the condition and adjust it according to the patient’s response. If initial β agonist treatment does not alleviate symptoms, ipratropium bromide can be added to the nebulized β2 agonist solution. In cases where children with a short duration of acute severe asthma symptoms have an oxygen saturation level below 92%, it is advisable to consider adding 150 mg of magnesium sulfate to each nebulized salbutamol and ipratropium within the first hour.

Long-acting β2 agonists should be discontinued if short-acting β2 agonists are required more frequently than every four hours.

Steroid therapy should be initiated early in the treatment of acute asthma attacks. For children aged 2-5 years, a dose of 20 mg prednisolone is recommended, while children over the age of 5 should receive a dose of 30-40 mg. Children already on maintenance steroid tablets should receive 2 mg/kg prednisolone, up to a maximum dose of 60 mg. If a child vomits after taking the initial dose of prednisolone, the dose should be repeated. In cases where a child is unable to retain orally ingested medication, intravenous steroids should be considered. Typically, treatment with oral steroids for up to three days is sufficient, but the duration of the course should be adjusted based on the time needed for recovery. Tapering is not necessary unless the course of steroids exceeds 14 days.

In cases where initial inhaled therapy does not yield a response in severe asthma attacks, the early addition of a single bolus dose of intravenous salbutamol (15 micrograms/kg over 10 minutes) should be considered. Aminophylline is not recommended for children with mild to moderate acute asthma, but it may be considered for those with severe or life-threatening asthma that is unresponsive to maximum doses of bronchodilators and steroids. The use of IV magnesium sulfate as a treatment for acute asthma in children is considered safe, although its role in management is not yet fully established.

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.

Neutropenic sepsis is a serious complication that can arise when a person has low levels of neutrophils, which are a type of white blood cell. This condition can be life-threatening and is commonly seen in individuals undergoing treatments such as cytotoxic chemotherapy or taking immunosuppressive drugs. Other causes of neutropenia include infections, bone marrow disorders like aplastic anemia and myelodysplastic syndromes, as well as nutritional deficiencies.

To diagnose neutropenic sepsis, doctors look for specific criteria in patients receiving anticancer treatment. These criteria include having a neutrophil count of 0.5 x 109 per liter or lower, along with either a body temperature higher than 38°C or other signs and symptoms that indicate a clinically significant sepsis.

Staphylococcus aureus is the primary organism responsible for infective endocarditis in individuals who use intravenous drugs (IVDUs). In fact, it is not only the most common cause of infective endocarditis overall, but also specifically in IVDUs. Please refer to the additional notes for more detailed information.

Further Reading:

Infective endocarditis (IE) is an infection that affects the innermost layer of the heart, known as the endocardium. It is most commonly caused by bacteria, although it can also be caused by fungi or viruses. IE can be classified as acute, subacute, or chronic depending on the duration of illness. Risk factors for IE include IV drug use, valvular heart disease, prosthetic valves, structural congenital heart disease, previous episodes of IE, hypertrophic cardiomyopathy, immune suppression, chronic inflammatory conditions, and poor dental hygiene.

The epidemiology of IE has changed in recent years, with Staphylococcus aureus now being the most common causative organism in most industrialized countries. Other common organisms include coagulase-negative staphylococci, streptococci, and enterococci. The distribution of causative organisms varies depending on whether the patient has a native valve, prosthetic valve, or is an IV drug user.

Clinical features of IE include fever, heart murmurs (most commonly aortic regurgitation), non-specific constitutional symptoms, petechiae, splinter hemorrhages, Osler’s nodes, Janeway’s lesions, Roth’s spots, arthritis, splenomegaly, meningism/meningitis, stroke symptoms, and pleuritic pain.

The diagnosis of IE is based on the modified Duke criteria, which require the presence of certain major and minor criteria. Major criteria include positive blood cultures with typical microorganisms and positive echocardiogram findings. Minor criteria include fever, vascular phenomena, immunological phenomena, and microbiological phenomena. Blood culture and echocardiography are key tests for diagnosing IE.

In summary, infective endocarditis is an infection of the innermost layer of the heart that is most commonly caused by bacteria. It can be classified as acute, subacute, or chronic and can be caused by a variety of risk factors. Staphylococcus aureus is now the most common causative organism in most industrialized countries. Clinical features include fever, heart murmurs, and various other symptoms. The diagnosis is based on the modified Duke criteria, which require the presence of certain major and minor criteria. Blood culture and echocardiography are important tests for diagnosing IE.

For the treatment of pregnant women with lower urinary tract infections (UTIs), it is recommended to provide them with an immediate prescription for antibiotics. It is important to consider their previous urine culture and susceptibility results, as well as any prior use of antibiotics that may have contributed to the development of resistant bacteria. Before starting antibiotics, it is advised to obtain a midstream urine sample from pregnant women and send it for culture and susceptibility testing.

Once the microbiological results are available, it is necessary to review the choice of antibiotic. If the bacteria are found to be resistant, it is recommended to switch to a narrow-spectrum antibiotic whenever possible. The choice of antibiotics for pregnant women aged 12 years and over is summarized below:

First-choice:
– Nitrofurantoin 100 mg modified-release taken orally twice daily for 3 days, if the estimated glomerular filtration rate (eGFR) is above 45 ml/minute.

Second-choice (if there is no improvement in lower UTI symptoms with the first-choice antibiotic for at least 48 hours, or if the first-choice is not suitable):
– Amoxicillin 500 mg taken orally three times daily for 7 days (only if culture results are available and show susceptibility).
– Cefalexin 500 mg taken twice daily for 7 days.

For alternative second-choice antibiotics, it is recommended to consult a local microbiologist and choose the appropriate antibiotics based on the culture and sensitivity results.

In the UK, the most commonly used treatment for acute exacerbations of hereditary angioedema (HAE) in emergency departments is C1-Esterase inhibitor. However, there are alternative options available. Icatibant acetate, sold under the brand name Firazyr®, is a bradykinin receptor antagonist that is licensed in the UK and Europe and can be used as an alternative treatment. Another alternative is the transfusion of fresh frozen plasma.

Further Reading:

Angioedema and urticaria are related conditions that involve swelling in different layers of tissue. Angioedema refers to swelling in the deeper layers of tissue, such as the lips and eyelids, while urticaria, also known as hives, refers to swelling in the epidermal skin layers, resulting in raised red areas of skin with itching. These conditions often coexist and may have a common underlying cause.

Angioedema can be classified into allergic and non-allergic types. Allergic angioedema is the most common type and is usually triggered by an allergic reaction, such as to certain medications like penicillins and NSAIDs. Non-allergic angioedema has multiple subtypes and can be caused by factors such as certain medications, including ACE inhibitors, or underlying conditions like hereditary angioedema (HAE) or acquired angioedema.

HAE is an autosomal dominant disease characterized by a deficiency of C1 esterase inhibitor. It typically presents in childhood and can be inherited or acquired as a result of certain disorders like lymphoma or systemic lupus erythematosus. Acquired angioedema may have similar clinical features to HAE but is caused by acquired deficiencies of C1 esterase inhibitor due to autoimmune or lymphoproliferative disorders.

The management of urticaria and allergic angioedema focuses on ensuring the airway remains open and addressing any identifiable triggers. In mild cases without airway compromise, patients may be advised that symptoms will resolve without treatment. Non-sedating antihistamines can be used for up to 6 weeks to relieve symptoms. Severe cases of urticaria may require systemic corticosteroids in addition to antihistamines. In moderate to severe attacks of allergic angioedema, intramuscular epinephrine may be considered.

The management of HAE involves treating the underlying deficiency of C1 esterase inhibitor. This can be done through the administration of C1 esterase inhibitor, bradykinin receptor antagonists, or fresh frozen plasma transfusion, which contains C1 inhibitor.

In summary, angioedema and urticaria are related conditions involving swelling in different layers of tissue. They can coexist and may have a common underlying cause. Management involves addressing triggers, using antihistamines, and in severe cases, systemic corticosteroids or other specific treatments for HAE.

When managing a first episode of acute venous thromboembolism (VTE), it is recommended to start warfarin in combination with a parenteral anticoagulant, such as unfractionated heparin, low-molecular-weight heparin, or fondaparinux. The parental anticoagulant should be continued for a minimum of 5 days and ideally until the international normalized ratio (INR) is above 2 for at least 24 hours.

To prevent the extension of the blood clot and recurrence in calf deep vein thrombosis (DVT), at least 6 weeks of anticoagulant therapy is necessary. For proximal DVT, a minimum of 3 months of anticoagulant therapy is required.

For first episodes of VTE, the ideal target INR is 2.5. However, in cases where patients experience recurrent VTE while being anticoagulated within the therapeutic range, the target INR should be increased to 3.5.

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 60 kg, so the maximum safe dose of lidocaine hydrochloride would be 60 multiplied by 7 mg, resulting in a total of 420 mg.

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

In this scenario, a 48-year-old patient presents to the emergency department with severe headache, excessive sweating, and episodes of blurred vision. The patient’s triage observations reveal a significantly elevated blood pressure of 234/138 mmHg. The patient also mentions that they are awaiting the results of a 24-hour urine collection for hypertension investigation, specifically for catecholamines, metanephrines, and normetanephrines, as there is suspicion of phaeochromocytoma.

Phaeochromocytoma is a rare tumor that arises from the adrenal glands and can cause excessive release of catecholamines, such as adrenaline and noradrenaline. This leads to symptoms like severe hypertension, headache, sweating, and palpitations.

Given the patient’s presentation and suspicion of phaeochromocytoma, the most appropriate medication choice to lower the blood pressure would be phentolamine. Phentolamine is an alpha-adrenergic antagonist that blocks the effects of catecholamines on blood vessels, resulting in vasodilation and a decrease in blood pressure.

Hydralazine, magnesium sulfate, and glyceryl trinitrate are not the most appropriate choices in this scenario. Hydralazine is a direct vasodilator that acts on smooth muscle to relax blood vessels, but it does not specifically target the effects of catecholamines. Magnesium sulfate is commonly used for conditions like preeclampsia and eclampsia, but it does not directly address the underlying cause of hypertension in phaeochromocytoma. Glyceryl trinitrate, also known as nitroglycerin, is primarily used for the management of angina and does not specifically target the effects of catecholamines.

Diazepam is a benzodiazepine that has sedative and anxiolytic properties but does not directly lower blood pressure or address the underlying cause of hypertension in phaeochromocytoma.

Further Reading:

A hypertensive emergency is characterized by a significant increase in blood pressure accompanied by acute or progressive damage to organs. While there is no specific blood pressure value that defines a hypertensive emergency, systolic blood pressure is typically above 180 mmHg and/or diastolic blood pressure is above 120 mmHg. The most common presentations of hypertensive emergencies include cerebral infarction, pulmonary edema, encephalopathy, and congestive cardiac failure. Less common presentations include intracranial hemorrhage, aortic dissection, and pre-eclampsia/eclampsia.

The signs and symptoms of hypertensive emergencies can vary widely due to the potential dysfunction of every physiological system. Some common signs and symptoms include headache, nausea and/or vomiting, chest pain, arrhythmia, proteinuria, signs of acute kidney failure, epistaxis, dyspnea, dizziness, anxiety, confusion, paraesthesia or anesthesia, and blurred vision. Clinical assessment focuses on detecting acute or progressive damage to the cardiovascular, renal, and central nervous systems.

Investigations that are essential in evaluating hypertensive emergencies include U&Es (electrolyte levels), urinalysis, ECG, and CXR. Additional investigations may be considered depending on the suspected underlying cause, such as a CT head for encephalopathy or new onset confusion, CT thorax for suspected aortic dissection, and CT abdomen for suspected phaeochromocytoma. Plasma free metanephrines, urine total catecholamines, vanillylmandelic acid (VMA), and metanephrine may be tested if phaeochromocytoma is suspected. Urine screening for cocaine and/or amphetamines may be appropriate in certain cases, as well as an endocrine screen for Cushing’s syndrome.

The management of hypertensive emergencies involves cautious reduction of blood pressure to avoid precipitating renal, cerebral, or coronary ischemia. Staged blood pressure reduction is typically the goal, with an initial reduction in mean arterial pressure (MAP) by no more than 25% in the first hour. Further gradual reduction to a systolic blood pressure of 160 mmHg and diastolic blood pressure of 100 mmHg over the next 2 to 6 hours is recommended. Initial management involves treatment with intravenous antihypertensive agents in an intensive care setting with appropriate monitoring.

Activated charcoal is a commonly utilized substance for decontamination in cases of poisoning. Its main function is to attract and bind molecules of the ingested toxin onto its surface.

Activated charcoal is a chemically inert form of carbon. It is a fine black powder that has no odor or taste. This powder is created by subjecting carbonaceous matter to high heat, a process known as pyrolysis, and then concentrating it with a solution of zinc chloride. Through this process, the activated charcoal develops a complex network of pores, providing it with a large surface area of approximately 3,000 m2/g. This extensive surface area allows it to effectively hinder the absorption of the harmful toxin by up to 50%.

The typical dosage for adults is 50 grams, while children are usually given 1 gram per kilogram of body weight. Activated charcoal can be administered orally or through a nasogastric tube. It is crucial to administer it within one hour of ingestion, and if necessary, a second dose may be repeated after one hour.

This woman is displaying symptoms and signs that are in line with a diagnosis of meningococcal septicaemia. In the United Kingdom, the majority of cases of meningococcal septicaemia are caused by Neisseria meningitidis group B.

The implementation of a vaccination program for Neisseria meningitidis group C has significantly reduced the prevalence of this particular type. However, a vaccine for group B disease is currently undergoing clinical trials and is not yet accessible for widespread use.

There is no indication for an independent psychiatric evaluation of this patient. However, it is important to clearly document in his medical records that you have assessed his mental capacity and determined that he is capable of making decisions. It would not be appropriate in this case to refer him to a specialist against his wishes or to breach confidentiality by discussing his illness with his family or next of kin. According to the guidelines set by the General Medical Council (GMC), it is necessary to document the fact that the patient has declined relevant information. It is also important to avoid pressuring the patient to change their mind in these circumstances.

For further information, please refer to the GMC guidelines on treatment and care towards the end of life: good practice in decision making.

postmenopausal bleeding should always be treated as a potential malignancy until proven otherwise. The first step in investigating postmenopausal bleeding is a transvaginal ultrasound (TVUS). This method effectively assesses the risk of endometrial cancer by measuring the thickness of the endometrium.

In postmenopausal women, the average endometrial thickness is much thinner compared to premenopausal women. A thicker endometrium indicates a higher likelihood of endometrial cancer. Currently, in the UK, an endometrial thickness threshold of 5 mm is used. If the thickness exceeds this threshold, there is a 7.3% chance of endometrial cancer being present.

For women with postmenopausal bleeding, if the endometrial thickness is uniformly less than 5 mm, the likelihood of endometrial cancer is less than 1%. However, in cases deemed clinically high-risk, additional investigations such as hysteroscopy and endometrial biopsy should be performed.

The definitive diagnosis of endometrial cancer is made through histological examination. If the endometrial thickness exceeds 5 mm, an endometrial biopsy is recommended to confirm the presence of cancer.

Propofol often leads to hypotension as a common side effect. Other common side effects of Propofol include apnoea, arrhythmias, headache, and nausea with vomiting.

Further Reading:

Procedural sedation is commonly used by emergency department (ED) doctors to minimize pain and discomfort during procedures that may be painful or distressing for patients. Effective procedural sedation requires the administration of analgesia, anxiolysis, sedation, and amnesia. This is typically achieved through the use of a combination of short-acting analgesics and sedatives.

There are different levels of sedation, ranging from minimal sedation (anxiolysis) to general anesthesia. It is important for clinicians to understand the level of sedation being used and to be able to manage any unintended deeper levels of sedation that may occur. Deeper levels of sedation are similar to general anesthesia and require the same level of care and monitoring.

Various drugs can be used for procedural sedation, including propofol, midazolam, ketamine, and fentanyl. Each of these drugs has its own mechanism of action and side effects. Propofol is commonly used for sedation, amnesia, and induction and maintenance of general anesthesia. Midazolam is a benzodiazepine that enhances the effect of GABA on the GABA A receptors. Ketamine is an NMDA receptor antagonist and is used for dissociative sedation. Fentanyl is a highly potent opioid used for analgesia and sedation.

The doses of these drugs for procedural sedation in the ED vary depending on the drug and the route of administration. It is important for clinicians to be familiar with the appropriate doses and onset and peak effect times for each drug.

Safe sedation requires certain requirements, including appropriate staffing levels, competencies of the sedating practitioner, location and facilities, and monitoring. The level of sedation being used determines the specific requirements for safe sedation.

After the procedure, patients should be monitored until they meet the criteria for safe discharge. This includes returning to their baseline level of consciousness, having vital signs within normal limits, and not experiencing compromised respiratory status. Pain and discomfort should also be addressed before discharge.

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.

Reported parental perception of a fever should be regarded as valid and taken seriously by healthcare professionals.

For infants under the age of 4 weeks, it is recommended to measure body temperature using an electronic thermometer in the axilla.

In children aged 4 weeks to 5 years, body temperature can be measured using one of the following methods: an electronic thermometer in the axilla, a chemical dot thermometer in the axilla, or an infra-red tympanic thermometer.

It is important to note that oral and rectal routes should not be utilized for temperature measurement in this age group. Additionally, forehead chemical thermometers are not reliable and should be avoided.

Neisseria gonorrhoeae is a type of bacteria that is shaped like two spheres and stains pink when tested. It is responsible for causing the sexually transmitted infection known as gonorrhoea. This infection is most commonly seen in individuals between the ages of 15 and 35, and it is primarily transmitted through sexual contact. One important thing to note is that the gonococcal pili, which are hair-like structures on the bacteria, can change their appearance. This means that even if someone has recovered from a previous infection, they can still be reinfected due to the bacteria’s ability to change.

In men, the clinical signs of gonorrhoea include inflammation of the urethra, which is seen in approximately 80% of cases. Around 50% of men experience pain or discomfort during urination, and a mucopurulent discharge may also be present. Rectal infection is possible, although it is usually asymptomatic. In some cases, it can cause anal discharge. Pharyngitis, or inflammation of the throat, is also possible but typically does not cause any noticeable symptoms.

Women with gonorrhoea may experience a vaginal discharge, which is seen in about 50% of cases. Lower abdominal pain is reported in approximately 25% of women, and dysuria, or painful urination, is seen in 10-15% of cases. Pelvic or lower abdominal tenderness is less common, occurring in less than 5% of women. Additionally, women may have an endocervical discharge and/or bleeding. Similar to men, rectal infection is usually asymptomatic but can cause anal discharge. Pharyngitis is also possible in women, but it is typically asymptomatic.

The symptoms of acute mountain sickness (AMS) typically appear within 6-12 hours of reaching an altitude above 2500 meters. On the other hand, the onset of high altitude cerebral edema (HACE) and high altitude pulmonary edema (HAPE) usually occurs after 2-4 days of being at high altitude.

Further Reading:

High Altitude Illnesses

Altitude & Hypoxia:
– As altitude increases, atmospheric pressure decreases and inspired oxygen pressure falls.
– Hypoxia occurs at altitude due to decreased inspired oxygen.
– At 5500m, inspired oxygen is approximately half that at sea level, and at 8900m, it is less than a third.

Acute Mountain Sickness (AMS):
– AMS is a clinical syndrome caused by hypoxia at altitude.
– Symptoms include headache, anorexia, sleep disturbance, nausea, dizziness, fatigue, malaise, and shortness of breath.
– Symptoms usually occur after 6-12 hours above 2500m.
– Risk factors for AMS include previous AMS, fast ascent, sleeping at altitude, and age <50 years old.
– The Lake Louise AMS score is used to assess the severity of AMS.
– Treatment involves stopping ascent, maintaining hydration, and using medication for symptom relief.
– Medications for moderate to severe symptoms include dexamethasone and acetazolamide.
– Gradual ascent, hydration, and avoiding alcohol can help prevent AMS.

High Altitude Pulmonary Edema (HAPE):
– HAPE is a progression of AMS but can occur without AMS symptoms.
– It is the leading cause of death related to altitude illness.
– Risk factors for HAPE include rate of ascent, intensity of exercise, absolute altitude, and individual susceptibility.
– Symptoms include dyspnea, cough, chest tightness, poor exercise tolerance, cyanosis, low oxygen saturations, tachycardia, tachypnea, crepitations, and orthopnea.
– Management involves immediate descent, supplemental oxygen, keeping warm, and medication such as nifedipine.

High Altitude Cerebral Edema (HACE):
– HACE is thought to result from vasogenic edema and increased vascular pressure.
– It occurs 2-4 days after ascent and is associated with moderate to severe AMS symptoms.
– Symptoms include headache, hallucinations, disorientation, confusion, ataxia, drowsiness, seizures, and manifestations of raised intracranial pressure.
– Immediate descent is crucial for management, and portable hyperbaric therapy may be used if descent is not possible.
– Medication for treatment includes dexamethasone and supplemental oxygen. Acetazolamide is typically used for prophylaxis.

To treat serious arrhythmia caused by hypomagnesaemia, it is recommended to administer 2 g of magnesium sulphate intravenously over a period of 10-15 minutes.

Further Reading:

In the management of respiratory and cardiac arrest, several drugs are commonly used to help restore normal function and improve outcomes. Adrenaline is a non-selective agonist of adrenergic receptors and is administered intravenously at a dose of 1 mg every 3-5 minutes. It works by causing vasoconstriction, increasing systemic vascular resistance (SVR), and improving cardiac output by increasing the force of heart contraction. Adrenaline also has bronchodilatory effects.

Amiodarone is another drug used in cardiac arrest situations. It blocks voltage-gated potassium channels, which prolongs repolarization and reduces myocardial excitability. The initial dose of amiodarone is 300 mg intravenously after 3 shocks, followed by a dose of 150 mg after 5 shocks.

Lidocaine is an alternative to amiodarone in cardiac arrest situations. It works by blocking sodium channels and decreasing heart rate. The recommended dose is 1 mg/kg by slow intravenous injection, with a repeat half of the initial dose after 5 minutes. The maximum total dose of lidocaine is 3 mg/kg.

Magnesium sulfate is used to reverse myocardial hyperexcitability associated with hypomagnesemia. It is administered intravenously at a dose of 2 g over 10-15 minutes. An additional dose may be given if necessary, but the maximum total dose should not exceed 3 g.

Atropine is an antagonist of muscarinic acetylcholine receptors and is used to counteract the slowing of heart rate caused by the parasympathetic nervous system. It is administered intravenously at a dose of 500 mcg every 3-5 minutes, with a maximum dose of 3 mg.

Naloxone is a competitive antagonist for opioid receptors and is used in cases of respiratory arrest caused by opioid overdose. It has a short duration of action, so careful monitoring is necessary. The initial dose of naloxone is 400 micrograms, followed by 800 mcg after 1 minute. The dose can be gradually escalated up to 2 mg per dose if there is no response to the preceding dose.

It is important for healthcare professionals to have knowledge of the pharmacology and dosing schedules of these drugs in order to effectively manage respiratory and cardiac arrest situations.

Pelvic inflammatory disease (PID) is a pelvic infection that affects the upper female reproductive tract, including the uterus, fallopian tubes, and ovaries. It is typically caused by an ascending infection from the cervix and is commonly associated with sexually transmitted diseases like chlamydia and gonorrhea. In the UK, genital Chlamydia trachomatis infection is the most common cause of PID seen in genitourinary medicine clinics.

PID can often be asymptomatic, but when symptoms are present, they may include lower abdominal pain and tenderness, fever, painful urination, painful intercourse, purulent vaginal discharge, abnormal vaginal bleeding, and tenderness in the cervix and adnexa. It is important to note that symptoms of ectopic pregnancy can be similar to those of PID, so a pregnancy test should be conducted for all patients with suspicious symptoms.

To investigate a possible case of PID, endocervical swabs should be taken to test for C. trachomatis and N. gonorrhoeae using nucleic acid amplification tests if available. Mild to moderate cases of PID can usually be managed in primary care or outpatient settings, while patients with severe disease should be admitted to the hospital for intravenous antibiotics. Signs of severe disease include a fever above 38°C, signs of a tubo-ovarian abscess, signs of pelvic peritonitis, or concurrent pregnancy.

Empirical antibiotic treatment should be initiated as soon as a presumptive diagnosis of PID is made clinically, without waiting for swab results. The current recommended outpatient treatment for PID is a single intramuscular dose of ceftriaxone 500 mg, followed by oral doxycycline 100 mg twice daily and oral metronidazole 400 mg twice daily for 14 days. An alternative regimen is oral ofloxacin 400 mg twice daily and oral metronidazole 400 mg twice daily for 14 days.

For severely ill patients in the inpatient setting, initial treatment includes intravenous doxycycline, a single-dose of intravenous ceftriaxone, and intravenous metronidazole. This is then followed by a switch to oral doxycycline and metronidazole to complete a 14-day treatment course. If a patient fails to respond to treatment, laparoscopy is necessary to confirm the diagnosis or consider alternative diagnoses.

Pregnant or postpartum women have a significantly higher risk of developing a venous thrombosis compared to women who are not pregnant. In fact, their risk is 10 times greater. Specifically, pregnant or postpartum women have a 1 in 500 chance of developing a venous thrombosis, whereas non-pregnant women have a much lower risk of 1 in 5000. It is important to remember the reversible causes of cardiac arrest, which are categorized as the 4 T’s and the 4 H’s, as mentioned in the notes below the algorithm.

Further Reading:

Cardiopulmonary arrest is a serious event with low survival rates. In non-traumatic cardiac arrest, only about 20% of patients who arrest as an in-patient survive to hospital discharge, while the survival rate for out-of-hospital cardiac arrest is approximately 8%. The Resus Council BLS/AED Algorithm for 2015 recommends chest compressions at a rate of 100-120 per minute with a compression depth of 5-6 cm. The ratio of chest compressions to rescue breaths is 30:2.

After a cardiac arrest, the goal of patient care is to minimize the impact of post cardiac arrest syndrome, which includes brain injury, myocardial dysfunction, the ischaemic/reperfusion response, and the underlying pathology that caused the arrest. The ABCDE approach is used for clinical assessment and general management. Intubation may be necessary if the airway cannot be maintained by simple measures or if it is immediately threatened. Controlled ventilation is aimed at maintaining oxygen saturation levels between 94-98% and normocarbia. Fluid status may be difficult to judge, but a target mean arterial pressure (MAP) between 65 and 100 mmHg is recommended. Inotropes may be administered to maintain blood pressure. Sedation should be adequate to gain control of ventilation, and short-acting sedating agents like propofol are preferred. Blood glucose levels should be maintained below 8 mmol/l. Pyrexia should be avoided, and there is some evidence for controlled mild hypothermia but no consensus on this.

Post ROSC investigations may include a chest X-ray, ECG monitoring, serial potassium and lactate measurements, and other imaging modalities like ultrasonography, echocardiography, CTPA, and CT head, depending on availability and skills in the local department. Treatment should be directed towards the underlying cause, and PCI or thrombolysis may be considered for acute coronary syndrome or suspected pulmonary embolism, respectively.

Patients who are comatose after ROSC without significant pre-arrest comorbidities should be transferred to the ICU for supportive care. Neurological outcome at 72 hours is the best prognostic indicator of outcome.

To calculate the overall rate of fluid administration for a patient, we need to consider both the deficit and maintenance requirements. The deficit is determined by the weight of the patient, with a 1kg deficit equaling 1000ml. However, we also need to subtract the 200 ml bolus from the deficit calculation. So, the deficit is 1000 ml – 200 ml = 800 ml.

The deficit calculation is for the next 48 hours, while maintenance is calculated per day. For maintenance, we use the Holliday-Segar formula based on the patient’s weight. For this patient, the formula is as follows:

– 100 ml/kg/day for the first 10 kg of body weight = 10 x 100 = 1000 ml
– 50 ml/kg/day for the next 10 to 20 kg = 50 x 10 = 500 ml
– 20 ml/kg/day for each additional kilogram above 20 kg = 0 (as the patient only weighs 20kg)

So, the total maintenance requirement is 1500 ml per day (over 24 hours), which equals 62 ml/hour.

To determine the overall rate, we add the maintenance requirement (62 ml/hr) to the deficit requirement (17 ml/hr). Therefore, the overall rate of fluid administration for this patient is 79 ml/hr.

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.

It is recommended to obtain an arterial blood gas (ABG) sample from all patients who have experienced submersion (drowning) as even individuals without symptoms may have a surprising level of hypoxia. Draining the lungs is not effective and not recommended. There is no strong evidence to support the routine use of antibiotics as a preventive measure. Steroids have not been proven to be effective in treating drowning. All drowning patients, except those with normal oxygen levels, normal saturations, and normal lung sounds, should receive supplemental oxygen as significant hypoxia can occur without causing difficulty in breathing.

Further Reading:

Drowning is the process of experiencing respiratory impairment from submersion or immersion in liquid. It can be classified as cold-water or warm-water drowning. Risk factors for drowning include young age and male sex. Drowning impairs lung function and gas exchange, leading to hypoxemia and acidosis. It also causes cardiovascular instability, which contributes to metabolic acidosis and cell death.

When someone is submerged or immersed, they will voluntarily hold their breath to prevent aspiration of water. However, continued breath holding causes progressive hypoxia and hypercapnia, leading to acidosis. Eventually, the respiratory center sends signals to the respiratory muscles, forcing the individual to take an involuntary breath and allowing water to be aspirated into the lungs. Water entering the lungs stimulates a reflex laryngospasm that prevents further penetration of water. Aspirated water can cause significant hypoxia and damage to the alveoli, leading to acute respiratory distress syndrome (ARDS).

Complications of drowning include cardiac ischemia and infarction, infection with waterborne pathogens, hypothermia, neurological damage, rhabdomyolysis, acute tubular necrosis, and disseminated intravascular coagulation (DIC).

In children, the diving reflex helps reduce hypoxic injury during submersion. It causes apnea, bradycardia, and peripheral vasoconstriction, reducing cardiac output and myocardial oxygen demand while maintaining perfusion of the brain and vital organs.

Associated injuries with drowning include head and cervical spine injuries in patients rescued from shallow water. Investigations for drowning include arterial blood gases, chest X-ray, ECG and cardiac monitoring, core temperature measurement, and blood and sputum cultures if secondary infection is suspected.

Management of drowning involves extricating the patient from water in a horizontal position with spinal precautions if possible. Cardiovascular considerations should be taken into account when removing patients from water to prevent hypotension and circulatory collapse. Airway management, supplemental oxygen, and ventilation strategies are important in maintaining oxygenation and preventing further lung injury. Correcting hypotension, electrolyte disturbances, and hypothermia is also necessary. Attempting to drain water from the lungs is ineffective.

Patients without associated physical injury who are asymptomatic and have no evidence of respiratory compromise after six hours can be safely discharged home. Ventilation strategies aim to maintain oxygenation while minimizing ventilator-associated lung injury.

Anticholinergic drugs work by blocking the effects of acetylcholine, a neurotransmitter, in both the central and peripheral nervous systems. These drugs are commonly used in clinical practice and include antihistamines, typical and atypical antipsychotics, anticonvulsants, antidepressants, antispasmodics, antiemetics, antiparkinsonian agents, antimuscarinics, and certain plants. When someone ingests an anticholinergic drug, they may experience a toxidrome, which is characterized by an agitated delirium and various signs of acetylcholine receptor blockade in the central and peripheral systems.

The central effects of anticholinergic drugs result in an agitated delirium, which is marked by fluctuating mental status, confusion, restlessness, visual hallucinations, picking at objects in the air, mumbling, slurred speech, disruptive behavior, tremor, myoclonus, and in rare cases, coma or seizures. On the other hand, the peripheral effects can vary and may include dilated pupils, sinus tachycardia, dry mouth, hot and flushed skin, increased body temperature, urinary retention, and ileus.

Subfalcine herniation occurs when a mass in one side of the brain causes the cingulate gyrus to be pushed under the falx cerebri. This condition often leads to specific neurological symptoms. These symptoms include a motor deficit in the lower limb on the opposite side of the body, bladder incontinence, motor and sensory deficits on the same side of the body as the herniation, and difficulty with speech (dysarthria).

Further Reading:

Intracranial pressure (ICP) refers to the pressure within the craniospinal compartment, which includes neural tissue, blood, and cerebrospinal fluid (CSF). Normal ICP for a supine adult is 5-15 mmHg. The body maintains ICP within a narrow range through shifts in CSF production and absorption. If ICP rises, it can lead to decreased cerebral perfusion pressure, resulting in cerebral hypoperfusion, ischemia, and potentially brain herniation.

The cranium, which houses the brain, is a closed rigid box in adults and cannot expand. It is made up of 8 bones and contains three main components: brain tissue, cerebral blood, and CSF. Brain tissue accounts for about 80% of the intracranial volume, while CSF and blood each account for about 10%. The Monro-Kellie doctrine states that the sum of intracranial volumes is constant, so an increase in one component must be offset by a decrease in the others.

There are various causes of raised ICP, including hematomas, neoplasms, brain abscesses, edema, CSF circulation disorders, venous sinus obstruction, and accelerated hypertension. Symptoms of raised ICP include headache, vomiting, pupillary changes, reduced cognition and consciousness, neurological signs, abnormal fundoscopy, cranial nerve palsy, hemiparesis, bradycardia, high blood pressure, irregular breathing, focal neurological deficits, seizures, stupor, coma, and death.

Measuring ICP typically requires invasive procedures, such as inserting a sensor through the skull. Management of raised ICP involves a multi-faceted approach, including antipyretics to maintain normothermia, seizure control, positioning the patient with a 30º head up tilt, maintaining normal blood pressure, providing analgesia, using drugs to lower ICP (such as mannitol or saline), and inducing hypocapnoeic vasoconstriction through hyperventilation. If these measures are ineffective, second-line therapies like barbiturate coma, optimised hyperventilation, controlled hypothermia, or decompressive craniectomy may be considered.

Febrile convulsions are harmless, generalized seizures that occur in otherwise healthy children who have a fever due to an infection outside the brain. To diagnose febrile convulsions, the child must be developing normally, the seizure should last less than 20 minutes, have no complex features, and not cause any lasting abnormalities.

The prognosis for febrile convulsions is generally positive. There is a 30 to 50% chance of experiencing recurrent febrile convulsions, with a 10% risk of recurrence within the first 24 hours. The likelihood of developing long-term epilepsy is around 6%.

Complex febrile convulsions are characterized by certain factors. These include focal seizures, seizures lasting longer than 15 minutes, experiencing more than one convulsion during a single fever episode, or the child being left with a focal neurological deficit.

Overall, febrile convulsions are typically harmless and do not cause any lasting damage.

Before performing arterial blood gas sampling, it is necessary to disinfect the skin. This is typically done using alcohol, which should be applied and given enough time to dry completely before proceeding with the skin puncture. In the UK, it is common to use solutions that combine alcohol with Chlorhexidine, such as Chloraprep® (2).

Further Reading:

Arterial blood gases (ABG) are an important diagnostic tool used to assess a patient’s acid-base status and respiratory function. When obtaining an ABG sample, it is crucial to prioritize safety measures to minimize the risk of infection and harm to the patient. This includes performing hand hygiene before and after the procedure, wearing gloves and protective equipment, disinfecting the puncture site with alcohol, using safety needles when available, and properly disposing of equipment in sharps bins and contaminated waste bins.

To reduce the risk of harm to the patient, it is important to test for collateral circulation using the modified Allen test for radial artery puncture. Additionally, it is essential to inquire about any occlusive vascular conditions or anticoagulation therapy that may affect the procedure. The puncture site should be checked for signs of infection, injury, or previous surgery. After the test, pressure should be applied to the puncture site or the patient should be advised to apply pressure for at least 5 minutes to prevent bleeding.

Interpreting ABG results requires a systematic approach. The core set of results obtained from a blood gas analyser includes the partial pressures of oxygen and carbon dioxide, pH, bicarbonate concentration, and base excess. These values are used to assess the patient’s acid-base status.

The pH value indicates whether the patient is in acidosis, alkalosis, or within the normal range. A pH less than 7.35 indicates acidosis, while a pH greater than 7.45 indicates alkalosis.

The respiratory system is assessed by looking at the partial pressure of carbon dioxide (pCO2). An elevated pCO2 contributes to acidosis, while a low pCO2 contributes to alkalosis.

The metabolic aspect is assessed by looking at the bicarbonate (HCO3-) level and the base excess. A high bicarbonate concentration and base excess indicate alkalosis, while a low bicarbonate concentration and base excess indicate acidosis.

Analyzing the pCO2 and base excess values can help determine the primary disturbance and whether compensation is occurring. For example, a respiratory acidosis (elevated pCO2) may be accompanied by metabolic alkalosis (elevated base excess) as a compensatory response.

The anion gap is another important parameter that can help determine the cause of acidosis. It is calculated by subtracting the sum of chloride and bicarbonate from the sum of sodium and potassium.

Bronchiolitis is a short-term infection of the lower respiratory tract that primarily affects infants aged 2 to 6 months. It is commonly caused by a viral infection, with respiratory syncytial virus (RSV) being the most prevalent culprit. RSV infections are most prevalent during the winter months, typically occurring between November and March. In the UK, bronchiolitis is the leading cause of hospitalization among infants.

The typical symptoms of bronchiolitis include fever, difficulty breathing, coughing, poor feeding, irritability, apnoeas (more common in very young infants), and wheezing or fine inspiratory crackles. To confirm the diagnosis, a nasopharyngeal aspirate can be taken for RSV rapid testing. This test is useful in preventing unnecessary further testing and facilitating the isolation of the affected infant.

Most infants with acute bronchiolitis experience a mild, self-limiting illness that does not require hospitalization. Treatment primarily focuses on supportive measures, such as ensuring adequate fluid and nutritional intake and controlling the infant’s temperature. The illness typically lasts for 7 to 10 days.

However, hospital referral and admission are recommended in certain cases, including poor feeding (less than 50% of usual intake over the past 24 hours), lethargy, a history of apnoea, a respiratory rate exceeding 70 breaths per minute, nasal flaring or grunting, severe chest wall recession, cyanosis, oxygen saturations below 90% for children aged 6 weeks and over, and oxygen saturations below 92% for babies under 6 weeks or those with underlying health conditions.

If hospitalization is necessary, treatment involves supportive measures, supplemental oxygen, and nasogastric feeding as needed. There is limited or no evidence supporting the use of antibiotics, antivirals, bronchodilators, corticosteroids, hypertonic saline, or adrenaline nebulizers in the management of bronchiolitis.

Acute kidney injury (AKI), previously known as acute renal failure, is a sudden decline in kidney function. This results in the accumulation of waste products and disturbances in fluid and electrolyte balance. AKI can occur in individuals with previously normal kidney function or those with pre-existing kidney disease, known as acute-on-chronic kidney disease. It is a relatively common condition, with approximately 15% of adults admitted to hospitals in the UK developing AKI.

The causes of AKI can be categorized into pre-renal, intrinsic renal, and post-renal factors. The majority of AKI cases in the community are due to pre-renal causes, accounting for 90% of cases. These are often associated with conditions such as hypotension from sepsis or fluid depletion. Medications, particularly ACE inhibitors and NSAIDs, are also frequently implicated in AKI.

The table below summarizes the most common causes of AKI:

Pre-renal:
– Volume depletion (e.g., hemorrhage, severe vomiting or diarrhea, burns)
– Oedematous states (e.g., cardiac failure, liver cirrhosis, nephrotic syndrome)
– Hypotension (e.g., cardiogenic shock, sepsis, anaphylaxis)
– Cardiovascular conditions (e.g., severe cardiac failure, arrhythmias)
– Renal hypoperfusion: NSAIDs, COX-2 inhibitors, ACE inhibitors or ARBs, Abdominal aortic aneurysm
– Renal artery stenosis
– Hepatorenal syndrome

Intrinsic renal:
– Glomerular disease (e.g., glomerulonephritis, thrombosis, hemolytic-uremic syndrome)
– Tubular injury: acute tubular necrosis (ATN) following prolonged ischemia
– Acute interstitial nephritis due to drugs (e.g., NSAIDs), infection, or autoimmune diseases
– Vascular disease (e.g., vasculitis, polyarteritis nodosa, thrombotic microangiopathy, cholesterol emboli, renal vein thrombosis, malignant hypertension)
– Eclampsia

Post-renal:
– Renal stones
– Blood clot
– Papillary necrosis
– Urethral stricture
– Prostatic hypertrophy or malignancy
– Bladder tumor
– Radiation fibrosis
– Pelvic malignancy
– Retroperitoneal fibrosis

The classic ECG features of atrial fibrillation include an irregularly irregular rhythm, the absence of p-waves, an irregular ventricular rate, and the presence of fibrillation waves. This irregular rhythm occurs because the atrial impulses are filtered out by the AV node.

In addition, Ashman beats may be observed in atrial fibrillation. These beats are characterized by wide complex QRS complexes, often with a morphology resembling right bundle branch block. They occur after a short R-R interval that is preceded by a prolonged R-R interval. Fortunately, Ashman beats are generally considered harmless.

The disorganized electrical activity in atrial fibrillation typically originates at the root of the pulmonary veins.

Von Willebrand disease (vWD) is a common hereditary coagulation disorder that affects approximately 1 in 100 individuals. It occurs due to a deficiency in Von Willebrand factor (vWF), which plays a crucial role in blood clotting. vWF not only binds to factor VIII to protect it from rapid breakdown, but it is also necessary for proper platelet adhesion. When vWF is lacking, both factor VIII levels and platelet function are affected, leading to prolonged APTT and bleeding time. However, the platelet count and thrombin time remain unaffected.

While some individuals with vWD may not experience any symptoms and are diagnosed incidentally during a clotting profile check, others may present with easy bruising, nosebleeds (epistaxis), and heavy menstrual bleeding (menorrhagia). In severe cases, more significant bleeding and joint bleeding (haemarthrosis) can occur.

For mild cases of von Willebrand disease, bleeding can be managed with desmopressin. This medication works by stimulating the release of vWF stored in the Weibel-Palade bodies, which are storage granules found in the endothelial cells lining the blood vessels and heart. By increasing the patient’s own levels of vWF, desmopressin helps improve clotting. In more severe cases, replacement therapy is necessary. This involves infusing cryoprecipitate or Factor VIII concentrate to provide the missing vWF. Replacement therapy is particularly recommended for patients with severe von Willebrand’s disease who are undergoing moderate or major surgical procedures.

The two-level PE Wells score has been simplified to determine the likelihood of a pulmonary embolism (PE) into two outcomes: likely or unlikely. A score of over 4 indicates that a PE is likely, while a score of 4 points or less indicates that a PE is unlikely.

The allocation of points is as follows:

– Clinical symptoms and signs of deep vein thrombosis (DVT) = 3 points
– An alternative diagnosis that is less likely than a PE = 3 points
– Heart rate greater than 100 = 1.5 points
– Immobilization for more than 3 days or recent surgery within 4 weeks = 1.5 points
– Previous history of DVT or PE = 1.5 points
– Presence of haemoptysis = 1 point
– Malignancy (currently on treatment, treated in the last 6 months, or palliative care) = 1 point.