Benign paroxysmal positional vertigo (BPPV) occurs when there is dysfunction in the inner ear. This dysfunction causes the otoliths, which are located in the utricle, to become dislodged from their normal position and migrate into one of the semicircular canals over time. As a result, these detached otoliths continue to move even after head movement has stopped, leading to vertigo due to the conflicting sensation of ongoing movement with other sensory inputs.

While the majority of BPPV cases have no identifiable cause (idiopathic), approximately 40% of cases can be attributed to factors such as head injury, spontaneous labyrinthine degeneration, post-viral illness, middle ear surgery, or chronic middle ear disease.

The main clinical features of BPPV include symptoms that are provoked by head movement, rolling over, and upward gaze. These episodes are typically brief, lasting less than 5 minutes, and are often worse in the mornings. Unlike other inner ear disorders, BPPV does not cause hearing loss or tinnitus. Nausea is a common symptom, while vomiting is rare. The Dix-Hallpike test can be used to confirm the diagnosis of BPPV.

It is important to note that vestibular suppressant medications have not been proven to be beneficial in managing BPPV. These medications do not improve symptoms or reduce the duration of the disease.

The treatment of choice for BPPV is the Epley manoeuvre. This maneuver aims to reposition the dislodged otoliths back into the utricles from the semicircular canals. A 2014 Cochrane review concluded that the Epley manoeuvre is a safe and effective treatment for BPPV, with a number needed to treat of 2-4.

Referral to an ENT specialist is recommended for patients with BPPV in the following situations: if the treating clinician is unable to perform or access the Epley manoeuvre, if the Epley manoeuvre has not been beneficial after repeated attempts (minimum two), if the patient has been symptomatic for more than 4 weeks, or if the patient has experienced more than 3 episodes of BPPV.

Moderate to severe cyanide poisoning typically leads to a condition called high anion gap metabolic acidosis, characterized by elevated levels of lactate (>10 mmol/L). Cyanide toxicity can occur from inhaling smoke produced by burning materials such as plastics, wools, silk, and other natural and synthetic polymers, which can release hydrogen cyanide (HCN). Symptoms of cyanide poisoning include headaches, nausea, decreased consciousness or loss of consciousness, and seizures. Measuring cyanide levels is not immediately helpful in managing a patient suspected of cyanide toxicity. Cyanide binds to the ferric (Fe3+) ion of cytochrome oxidase, causing a condition known as histotoxic hypoxia and resulting in lactic acidosis. The presence of a high lactate level (>10) and a classic high anion gap metabolic acidosis should raise suspicion of cyanide poisoning in a clinician.

Further Reading:

Burn injuries can be classified based on their type (degree, partial thickness or full thickness), extent as a percentage of total body surface area (TBSA), and severity (minor, moderate, major/severe). Severe burns are defined as a >10% TBSA in a child and >15% TBSA in an adult.

When assessing a burn, it is important to consider airway injury, carbon monoxide poisoning, type of burn, extent of burn, special considerations, and fluid status. Special considerations may include head and neck burns, circumferential burns, thorax burns, electrical burns, hand burns, and burns to the genitalia.

Airway management is a priority in burn injuries. Inhalation of hot particles can cause damage to the respiratory epithelium and lead to airway compromise. Signs of inhalation injury include visible burns or erythema to the face, soot around the nostrils and mouth, burnt/singed nasal hairs, hoarse voice, wheeze or stridor, swollen tissues in the mouth or nostrils, and tachypnea and tachycardia. Supplemental oxygen should be provided, and endotracheal intubation may be necessary if there is airway obstruction or impending obstruction.

The initial management of a patient with burn injuries involves conserving body heat, covering burns with clean or sterile coverings, establishing IV access, providing pain relief, initiating fluid resuscitation, measuring urinary output with a catheter, maintaining nil by mouth status, closely monitoring vital signs and urine output, monitoring the airway, preparing for surgery if necessary, and administering medications.

Burns can be classified based on the depth of injury, ranging from simple erythema to full thickness burns that penetrate into subcutaneous tissue. The extent of a burn can be estimated using methods such as the rule of nines or the Lund and Browder chart, which takes into account age-specific body proportions.

Fluid management is crucial in burn injuries due to significant fluid losses. Evaporative fluid loss from burnt skin and increased permeability of blood vessels can lead to reduced intravascular volume and tissue perfusion. Fluid resuscitation should be aggressive in severe burns, while burns <15% in adults and <10% in children may not require immediate fluid resuscitation. The Parkland formula can be used to calculate the intravenous fluid requirements for someone with a significant burn injury.

The cardiotoxic effects of TCAs occur when they block sodium channels, leading to broadening of the QRS complex, and potassium channels, resulting in prolongation of the QT interval. The severity of adverse events is directly related to the degree of QRS broadening. If the QRS complex is greater than 100 ms, it is likely that seizures may occur. If the QRS complex exceeds 160 ms, ventricular arrhythmias may be predicted. In cases of TCA overdose, certain changes can be observed on an ECG. These include sinus tachycardia, which is very common, prolongation of the PR interval, broadening of the QRS complex, prolongation of the QT interval, and in severe cases, ventricular arrhythmias.

The Royal College of Emergency Medicine (RCEM) recommends asking four important questions to individuals showing signs and symptoms of carbon monoxide poisoning. These questions can be easily remembered using the acronym COMA. The questions are as follows:
1. Is anyone else in the house, including pets, experiencing similar symptoms?
2. Do the symptoms improve when you are outside of the house?
3. Are the boilers and cooking appliances in your house properly maintained?
4. Do you have a functioning carbon monoxide alarm?

Further Reading:

Carbon monoxide (CO) is a dangerous gas that is produced by the combustion of hydrocarbon fuels and can be found in certain chemicals. It is colorless and odorless, making it difficult to detect. In England and Wales, there are approximately 60 deaths each year due to accidental CO poisoning.

When inhaled, carbon monoxide binds to haemoglobin in the blood, forming carboxyhaemoglobin (COHb). It has a higher affinity for haemoglobin than oxygen, causing a left-shift in the oxygen dissociation curve and resulting in tissue hypoxia. This means that even though there may be a normal level of oxygen in the blood, it is less readily released to the tissues.

The clinical features of carbon monoxide toxicity can vary depending on the severity of the poisoning. Mild or chronic poisoning may present with symptoms such as headache, nausea, vomiting, vertigo, confusion, and weakness. More severe poisoning can lead to intoxication, personality changes, breathlessness, pink skin and mucosae, hyperpyrexia, arrhythmias, seizures, blurred vision or blindness, deafness, extrapyramidal features, coma, or even death.

To help diagnose domestic carbon monoxide poisoning, there are four key questions that can be asked using the COMA acronym. These questions include asking about co-habitees and co-occupants in the house, whether symptoms improve outside of the house, the maintenance of boilers and cooking appliances, and the presence of a functioning CO alarm.

Typical carboxyhaemoglobin levels can vary depending on whether the individual is a smoker or non-smoker. Non-smokers typically have levels below 3%, while smokers may have levels below 10%. Symptomatic individuals usually have levels between 10-30%, and severe toxicity is indicated by levels above 30%.

When managing carbon monoxide poisoning, the first step is to administer 100% oxygen. Hyperbaric oxygen therapy may be considered for individuals with a COHb concentration of over 20% and additional risk factors such as loss of consciousness, neurological signs, myocardial ischemia or arrhythmia, or pregnancy. Other management strategies may include fluid resuscitation, sodium bicarbonate for metabolic acidosis, and mannitol for cerebral edema.

An overdose of aspirin often leads to a combination of respiratory alkalosis and metabolic acidosis. Initially, the stimulation of the respiratory center causes hyperventilation and results in respiratory alkalosis. However, as the overdose progresses, the direct acidic effects of aspirin cause an increase in the anion gap and metabolic acidosis.

Here is a summary of common causes for different acid-base disorders:

Respiratory alkalosis can be caused by hyperventilation due to factors such as anxiety, pulmonary embolism, CNS disorders (such as stroke or encephalitis), altitude, pregnancy, and the early stages of aspirin overdose.

Respiratory acidosis can occur in individuals with chronic obstructive pulmonary disease (COPD), life-threatening asthma, pulmonary edema, sedative drug overdose (such as opioids or benzodiazepines), neuromuscular diseases, and obesity.

Metabolic alkalosis can be caused by vomiting, potassium depletion (often due to diuretic usage), Cushing’s syndrome, and Conn’s syndrome.

Metabolic acidosis with a raised anion gap can result from conditions such as lactic acidosis (caused by factors like hypoxemia, shock, sepsis, or tissue infarction), ketoacidosis (associated with diabetes, starvation, or excessive alcohol consumption), renal failure, and poisoning (including the late stages of aspirin overdose, methanol or ethylene glycol ingestion).

Metabolic acidosis with a normal anion gap can be seen in renal tubular acidosis, diarrhea, ammonium chloride ingestion, and adrenal insufficiency.

The first line of treatment for neuropathic pain includes options such as amitriptyline, duloxetine, gabapentin, or pregabalin. The dosage should be adjusted based on how the individual responds to the medication and their ability to tolerate it. If the initial treatment does not provide relief or is not well tolerated, one of the remaining three medications can be considered as an alternative option.

Primary sclerosing cholangitis (PSC) is a condition that affects the bile ducts, causing inflammation and blockage over time. It is more commonly seen in men than women, with a ratio of 3 to 1, and is typically diagnosed around the age of 40. PSC is characterized by recurring episodes of cholangitis and progressive scarring of the bile ducts. If left untreated, it can lead to liver cirrhosis, liver failure, and even hepatocellular carcinoma. PSC is often associated with ulcerative colitis, with more than 80% of PSC patients also having this condition. Other associations include fibrosis in the retroperitoneal and mediastinal areas.

When performing an endoscopic retrograde cholangiopancreatography (ERCP) to diagnose PSC, certain findings are typically observed. These include ulceration of the common bile duct, irregular narrowing with saccular dilatation above the structured ducts (resembling beads-on-a-string or a beaded appearance), and involvement of both the intra- and extrahepatic ducts simultaneously.

Complications that can arise from PSC include liver cirrhosis, portal hypertension, liver failure, and cholangiocarcinoma. Treatment options for PSC include the use of ursodeoxycholic acid to improve symptoms and liver function (although it does not affect the overall prognosis), cholestyramine to alleviate itching, and correction of deficiencies in fat-soluble vitamins. In some cases, endoscopic dilatation of strictures may be necessary.

Liver transplantation is the definitive treatment for PSC. The 10-year survival rate after transplantation is approximately 65%, and the average survival time from the time of diagnosis is around seven years. Patients with PSC often succumb to complications such as secondary biliary cirrhosis, portal hypertension, or cholangitis. Additionally, about 10% of PSC patients will develop cholangiocarcinoma.

Thyroid storm, also known as thyrotoxic crisis, is a rare and dangerous complication of hyperthyroidism. The initial management of this condition involves the use of specific medications. These medications include a beta blocker, a corticosteroid, an antithyroid drug, and an iodine solution.

The beta blocker used is typically propranolol, which is administered intravenously at a dose of 1 mg over 1 minute. If a beta blocker is contraindicated, a calcium channel blocker such as diltiazem may be used instead, at a dose of 0.25 mg/kg over 2 minutes.

For corticosteroids, hydrocortisone is commonly used and given intravenously at a dose of 200 mg. Alternatively, dexamethasone can be used at a dose of 2 mg intravenously.

The antithyroid drug used is usually propylthiouracil, which is given orally, through a nasogastric tube, or rectally, at a dose of 200 mg.

An iodine solution, specifically Lugol’s iodine, is also part of the initial management. However, it should not be administered until at least 1 hour after the antithyroid drug has been given. This is because iodine can exacerbate thyrotoxicosis by stimulating thyroid hormone synthesis. Propylthiouracil, on the other hand, inhibits the normal interactions of iodine and peroxidase with thyroglobulin, preventing the formation of T4 and T3. Therefore, it is given first and allowed time to take effect before iodine is administered.

Further Reading:

The thyroid gland is an endocrine organ located in the anterior neck. It consists of two lobes connected by an isthmus. The gland produces hormones called thyroxine (T4) and triiodothyronine (T3), which regulate energy use, protein synthesis, and the body’s sensitivity to other hormones. The production of T4 and T3 is stimulated by thyroid-stimulating hormone (TSH) secreted by the pituitary gland, which is in turn stimulated by thyrotropin-releasing hormone (TRH) from the hypothalamus.

Thyroid disorders can occur when there is an imbalance in the production or regulation of thyroid hormones. Hypothyroidism is characterized by a deficiency of thyroid hormones, while hyperthyroidism is characterized by an excess. The most common cause of hypothyroidism is autoimmune thyroiditis, also known as Hashimoto’s thyroiditis. It is more common in women and is often associated with goiter. Other causes include subacute thyroiditis, atrophic thyroiditis, and iodine deficiency. On the other hand, the most common cause of hyperthyroidism is Graves’ disease, which is also an autoimmune disorder. Other causes include toxic multinodular goiter and subacute thyroiditis.

The symptoms and signs of thyroid disorders can vary depending on whether the thyroid gland is underactive or overactive. In hypothyroidism, common symptoms include weight gain, lethargy, cold intolerance, and dry skin. In hyperthyroidism, common symptoms include weight loss, restlessness, heat intolerance, and increased sweating. Both hypothyroidism and hyperthyroidism can also affect other systems in the body, such as the cardiovascular, gastrointestinal, and neurological systems.

Complications of thyroid disorders can include dyslipidemia, metabolic syndrome, coronary heart disease, heart failure, subfertility and infertility, impaired special senses, and myxedema coma in severe cases of hypothyroidism. In hyperthyroidism, complications can include Graves’ orbitopathy, compression of the esophagus or trachea by goiter, thyrotoxic periodic paralysis, arrhythmias, osteoporosis, mood disorders, and increased obstetric complications.

Myxedema coma is a rare and life-threatening complication of severe hypothyroidism. It can be triggered by factors such as infection or physiological insult and presents with lethargy, bradycardia, hypothermia, hypotension, hypoventilation, altered mental state, seizures and/or coma.

Gout and pseudogout are both characterized by the presence of crystal deposits in the joints that are affected. Gout occurs when urate crystals are deposited, while pseudogout occurs when calcium pyrophosphate crystals are deposited. Under a microscope, these crystals can be distinguished by their appearance. Urate crystals are needle-shaped and negatively birefringent, while calcium pyrophosphate crystals are brick-shaped and positively birefringent.

Gout can affect any joint in the body, but it most commonly manifests in the hallux metatarsophalangeal joint, which is the joint at the base of the big toe. This joint is affected in approximately 50% of gout cases. On the other hand, pseudogout primarily affects the larger joints, such as the knee.

Chickenpox is a highly contagious illness caused by the varicella-zoster virus, a DNA virus from the Herpesviridae family. Most cases are mild to moderate, and the infection usually resolves on its own. Severe complications are rare but can occur, especially in individuals with weakened immune systems or underlying health conditions.

The incubation period for chickenpox is typically between 14 to 21 days. It is contagious from a few days before the rash appears until about a week after the first lesions show up.

The common clinical features of chickenpox include:

– Fever, which lasts for approximately 3-5 days.
– The initial rash starts as flat red spots and progresses into raised bumps.
– These bumps then turn into fluid-filled blisters and eventually form pustules surrounded by redness.
– The lesions are extremely itchy.
– The rash reaches its peak around 48 hours in individuals with a healthy immune system.
– The rash tends to be more concentrated on the face and trunk, with fewer lesions on the limbs.
– The blisters eventually dry up and form crusts, which can lead to scarring if scratched.
– Headache, fatigue, and abdominal pain may also occur.

Chickenpox tends to be more severe in teenagers and adults compared to children. Antiviral treatment should be considered for these individuals if they seek medical attention within 24 hours of rash onset. The recommended oral dose of aciclovir is 800 mg taken five times a day for seven days.

Immunocompromised patients and those at higher risk, such as individuals with severe cardiovascular or respiratory disease or chronic skin disorders, should receive antiviral treatment for ten days, with at least seven days of intravenous administration.

Although most cases are relatively mild, if serious complications like pneumonia, encephalitis, or dehydration are suspected, it is important to refer the patient for hospital admission.

For more information, you can refer to the NICE Clinical Knowledge Summary on Chickenpox.
https://cks.nice.org.uk/topics/chickenpox/

Acute lymphoblastic leukaemia (ALL) is the most common type of leukaemia that occurs in childhood, typically affecting children between the ages of 2 and 5 years. The symptoms of ALL can vary, but many children initially experience an acute illness that may resemble a common cold or viral infection. Other signs of ALL include general weakness and fatigue, as well as muscle, joint, and bone pain. Additionally, children with ALL may have anaemia, unexplained bruising and petechiae, swelling (oedema), enlarged lymph nodes (lymphadenopathy), and an enlarged liver and spleen (hepatosplenomegaly).

In patients with ALL, a complete blood count typically reveals certain characteristics. These include anaemia, which can be either normocytic or macrocytic. Approximately 50% of patients with ALL have a low white blood cell count (leukopaenia), with a white cell count below 4 x 109/l. On the other hand, around 60% of patients have a high white blood cell count (leukocytosis), with a white cell count exceeding 10 x 109/l. In about 25% of cases, there is an extreme elevation in white blood cell count (hyperleukocytosis), with a count surpassing 50 x 109/l. Additionally, patients with ALL often have a low platelet count (thrombocytopaenia).

The most probable diagnosis in this case is a subarachnoid haemorrhage (SAH).

When assessing patients who present with an SAH, they may exhibit focal neurological signs, which can indicate the potential location of the aneurysm. Common areas where aneurysms occur include the bifurcation of the middle cerebral artery, the junction of the anterior communicating cerebral artery, and the junction of the posterior communicating artery with the internal carotid artery. If there is complete or partial paralysis of the oculomotor nerve, it suggests the rupture of a posterior communicating artery aneurysm.

While hypertension is a risk factor for SAH, a significant increase in blood pressure may occur as a reflex response following the haemorrhage.

Vomiting is a common occurrence during the early stages of pregnancy, typically happening between 7 and 12 weeks. However, there is a more severe condition called hyperemesis gravidarum, which involves uncontrollable and intense nausea and vomiting. This condition can lead to imbalances in fluids and electrolytes, significant ketonuria, malnutrition, and weight loss. It is relatively rare, affecting less than 1% of pregnancies.

For mild cases of nausea and vomiting in early pregnancy, dietary adjustments and non-pharmacological methods like consuming ginger or using P6 wrist acupressure can often provide relief.

In severe cases where heavy ketonuria and severe dehydration are present, hospital admission is usually necessary for intravenous fluid rehydration. The NICE Clinical Knowledge Summary (CKS) on nausea and vomiting in pregnancy recommends using oral promethazine, oral cyclizine, or oral prochlorperazine as the first-line treatment if an anti-emetic is needed. After 24 hours, the situation should be reassessed to determine if the initial treatment is effective. If not, a second-line drug like metoclopramide or ondansetron should be considered.

It’s important to exercise caution when using metoclopramide in patients under the age of 20 due to the increased risk of extrapyramidal side effects. Additionally, proton pump inhibitors (e.g., omeprazole) and histamine H2-receptor antagonists (e.g., ranitidine) can be beneficial for women experiencing significant dyspepsia alongside their nausea and vomiting.

For more information, refer to the NICE CKS on nausea and vomiting in pregnancy.

The tricuspid valve is the most commonly affected valve in cases of infective endocarditis among intravenous drug users. This means that when IV drug users develop infective endocarditis, it is most likely to affect the tricuspid valve. On the other hand, in cases of native valve endocarditis and prosthetic valve endocarditis, the mitral valve is the valve that is most commonly affected.

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.

Acute epiglottitis is inflammation of the epiglottis, which can be life-threatening if not treated promptly. When the soft tissues surrounding the epiglottis are also affected, it is called acute supraglottitis. This condition is most commonly seen in children between the ages of 3 and 5, but it can occur at any age, with adults typically presenting in their 40s and 50s.

In the past, Haemophilus influenzae type B was the main cause of acute epiglottitis, but with the introduction of the Hib vaccination, it has become rare in children. Streptococcus spp. is now the most common causative organism. Other potential culprits include Staphylococcus aureus, Pseudomonas spp., Moraxella catarrhalis, Mycobacterium tuberculosis, and the herpes simplex virus. In immunocompromised patients, Candida spp. and Aspergillus spp. infections can occur.

The typical symptoms of acute epiglottitis include fever, sore throat, painful swallowing, difficulty swallowing secretions (especially in children who may drool), muffled voice, stridor, respiratory distress, rapid heartbeat, tenderness in the front of the neck over the hyoid bone, ear pain, and swollen lymph nodes in the neck. Some patients may also exhibit the tripod sign, where they lean forward on outstretched arms to relieve upper airway obstruction.

To diagnose acute epiglottitis, fibre-optic laryngoscopy is considered the gold standard investigation. However, this procedure should only be performed by an anaesthetist in a setting prepared for intubation or tracheostomy in case of airway obstruction. Other useful tests include a lateral neck X-ray to look for the thumbprint sign, throat swabs, blood cultures, and a CT scan of the neck if an abscess is suspected.

When dealing with a case of acute epiglottitis, it is crucial not to panic or distress the patient, especially in pediatric cases. Avoid attempting to examine the throat with a tongue depressor, as this can trigger spasm and worsen airway obstruction. Instead, keep the patient as calm as possible and immediately call a senior anaesthetist, a senior paediatrician, and an ENT surgeon. Nebulized adrenaline can be used as a temporary measure if there is critical airway obstruction.

According to the RCEM, the minimum time for cuff inflation during Bier’s block is 20 minutes, while the maximum time is 45 minutes.

Further Reading:

Bier’s block is a regional intravenous anesthesia technique commonly used for minor surgical procedures of the forearm or for reducing distal radius fractures in the emergency department (ED). It is recommended by NICE as the preferred anesthesia block for adults requiring manipulation of distal forearm fractures in the ED.

Before performing the procedure, a pre-procedure checklist should be completed, including obtaining consent, recording the patient’s weight, ensuring the resuscitative equipment is available, and monitoring the patient’s vital signs throughout the procedure. The air cylinder should be checked if not using an electronic machine, and the cuff should be checked for leaks.

During the procedure, a double cuff tourniquet is placed on the upper arm, and the arm is elevated to exsanguinate the limb. The proximal cuff is inflated to a pressure 100 mmHg above the systolic blood pressure, up to a maximum of 300 mmHg. The time of inflation and pressure should be recorded, and the absence of the radial pulse should be confirmed. 0.5% plain prilocaine is then injected slowly, and the time of injection is recorded. The patient should be warned about the potential cold/hot sensation and mottled appearance of the arm. After injection, the cannula is removed and pressure is applied to the venipuncture site to prevent bleeding. After approximately 10 minutes, the patient should have anesthesia and should not feel pain during manipulation. If anesthesia is successful, the manipulation can be performed, and a plaster can be applied by a second staff member. A check x-ray should be obtained with the arm lowered onto a pillow. The tourniquet should be monitored at all times, and the cuff should be inflated for a minimum of 20 minutes and a maximum of 45 minutes. If rotation of the cuff is required, it should be done after the manipulation and plaster application. After the post-reduction x-ray is satisfactory, the cuff can be deflated while observing the patient and monitors. Limb circulation should be checked prior to discharge, and appropriate follow-up and analgesia should be arranged.

There are several contraindications to performing Bier’s block, including allergy to local anesthetic, hypertension over 200 mm Hg, infection in the limb, lymphedema, methemoglobinemia, morbid obesity, peripheral vascular disease, procedures needed in both arms, Raynaud’s phenomenon, scleroderma, severe hypertension and sickle cell disease.

Otitis externa, also known as swimmer’s ear, is a condition characterized by infection and inflammation of the ear canal. Common symptoms include pain, itching, and discharge from the ear. Upon examination with an otoscope, the ear canal will appear red and there may be pus and debris present.

There are several factors that can increase the risk of developing otitis externa, including skin conditions like psoriasis and eczema. Additionally, individuals who regularly expose their ears to water, such as swimmers, are more prone to this condition.

The most common organisms that cause otitis externa are Pseudomonas aeruginosa (50%), Staphylococcus aureus (23%), Gram-negative bacteria like E.coli (12%), and fungal species like Aspergillus and Candida (12%).

Treatment for otitis externa typically involves the use of topical antibiotic and corticosteroid combinations, such as Betnesol-N or Sofradex. In some cases, when the condition persists, referral to an ear, nose, and throat specialist may be necessary for auditory cleaning and the placement of an antibiotic-soaked wick.

Flumazenil is a specific antagonist for benzodiazepines that can be beneficial in certain situations. It acts quickly, taking less than 1 minute to take effect, but its effects are short-lived and only last for less than 1 hour. The recommended dosage is 200 μg every 1-2 minutes, with a maximum dose of 3mg per hour.

It is important to avoid using Flumazenil if the patient is dependent on benzodiazepines or is taking tricyclic antidepressants. This is because it can trigger a withdrawal syndrome in these individuals, potentially leading to seizures or cardiac arrest.

ATLS guidelines now suggest administering only 1 liter of crystalloid fluid during the initial assessment. If patients do not respond to the crystalloid, it is recommended to quickly transition to blood products. Studies have shown that infusing more than 1.5 liters of crystalloid fluid is associated with higher mortality rates in trauma cases. Therefore, it is advised to prioritize the early use of blood products and avoid large volumes of crystalloid fluid in trauma patients. In cases where it is necessary, massive transfusion should be considered, defined as the transfusion of more than 10 units of blood in 24 hours or more than 4 units of blood in one hour. For patients with evidence of Class III and IV hemorrhage, early resuscitation with blood and blood products in low ratios is recommended.

Based on the findings of significant trials, such as the CRASH-2 study, the use of tranexamic acid is now recommended within 3 hours. This involves administering a loading dose of 1 gram intravenously over 10 minutes, followed by an infusion of 1 gram over eight hours. In some regions, tranexamic acid is also being utilized in the prehospital setting.

Q waves in V2 and V3 are typically abnormal and indicate a pathological condition. Q waves are negative deflections that occur before an R wave. They can be either normal or abnormal. Small normal Q waves, which are less than 1mm deep, may be present in most leads. Deeper normal Q waves are commonly seen in lead III, as long as they are not present in the adjacent leads II and AVF. On the other hand, pathological Q waves are usually deeper and wider. In particular, Q waves should not be observed in V2 and V3. The specific criteria for identifying pathological Q waves are as follows: any Q wave in leads V2-V3 that is greater than 0.02s in duration or a QS complex in leads V2-V3; a Q wave that is greater than 0.03s in duration and deeper than 1mm, or a QS complex, in leads I, II, aVL, aVF, or V4-V6 in any two leads of a contiguous lead grouping; an R wave that is greater than 0.04s in duration in V1-V2 and has an R/S ratio greater than 1, along with a concordant positive T wave, in the absence of a conduction defect. In healthy individuals, the T-wave is normally inverted in aVR and inverted or flat in V1. T-wave inversion in III is also considered a normal variation. If there is ST elevation in lead V1, it would suggest a ST-elevation myocardial infarction (STEMI) rather than a non-ST-elevation myocardial infarction (NSTEMI).

Further Reading:

Acute Coronary Syndromes (ACS) is a term used to describe a group of conditions that involve the sudden reduction or blockage of blood flow to the heart. This can lead to a heart attack or unstable angina. ACS includes ST segment elevation myocardial infarction (STEMI), non-ST segment elevation myocardial infarction (NSTEMI), and unstable angina (UA).

The development of ACS is usually seen in patients who already have underlying coronary heart disease. This disease is characterized by the buildup of fatty plaques in the walls of the coronary arteries, which can gradually narrow the arteries and reduce blood flow to the heart. This can cause chest pain, known as angina, during physical exertion. In some cases, the fatty plaques can rupture, leading to a complete blockage of the artery and a heart attack.

There are both non modifiable and modifiable risk factors for ACS. non modifiable risk factors include increasing age, male gender, and family history. Modifiable risk factors include smoking, diabetes mellitus, hypertension, hypercholesterolemia, and obesity.

The symptoms of ACS typically include chest pain, which is often described as a heavy or constricting sensation in the central or left side of the chest. The pain may also radiate to the jaw or left arm. Other symptoms can include shortness of breath, sweating, and nausea/vomiting. However, it’s important to note that some patients, especially diabetics or the elderly, may not experience chest pain.

The diagnosis of ACS is typically made based on the patient’s history, electrocardiogram (ECG), and blood tests for cardiac enzymes, specifically troponin. The ECG can show changes consistent with a heart attack, such as ST segment elevation or depression, T wave inversion, or the presence of a new left bundle branch block. Elevated troponin levels confirm the diagnosis of a heart attack.

The management of ACS depends on the specific condition and the patient’s risk factors. For STEMI, immediate coronary reperfusion therapy, either through primary percutaneous coronary intervention (PCI) or fibrinolysis, is recommended. In addition to aspirin, a second antiplatelet agent is usually given. For NSTEMI or unstable angina, the treatment approach may involve reperfusion therapy or medical management, depending on the patient’s risk of future cardiovascular events.

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.

Croup, also known as laryngo-tracheo-bronchitis, is typically caused by the parainfluenza virus. Other viruses such as rhinovirus, influenza, and respiratory syncytial viruses can also be responsible. Before the onset of stridor, there is often a mild cold-like illness that lasts for 1-2 days. Symptoms usually reach their peak within 1-3 days, with the cough often being more troublesome at night. A milder cough may persist for another 7-10 days.

A distinctive feature of croup is a barking cough, but it does not indicate the severity of the condition. To reduce airway swelling, dexamethasone and prednisolone are commonly prescribed. If a child is experiencing vomiting, nebulized budesonide can be used as an alternative. However, it is important to note that steroids do not shorten the duration of the illness. In severe cases, nebulized adrenaline can be administered.

Hospitalization for croup is uncommon and typically reserved for children who are experiencing worsening respiratory distress or showing signs of drowsiness or agitation.

The most effective treatment for pyloric stenosis is pyloromyotomy, a surgical procedure. Before undergoing surgery, the patient should be rehydrated and any electrolyte imbalances should be corrected.

Further Reading:

Pyloric stenosis is a condition that primarily affects infants, characterized by the thickening of the muscles in the pylorus, leading to obstruction of the gastric outlet. It typically presents between the 3rd and 12th weeks of life, with recurrent projectile vomiting being the main symptom. The condition is more common in males, with a positive family history and being first-born being additional risk factors. Bottle-fed children and those delivered by c-section are also more likely to develop pyloric stenosis.

Clinical features of pyloric stenosis include projectile vomiting, usually occurring about 30 minutes after a feed, as well as constipation and dehydration. A palpable mass in the upper abdomen, often described as like an olive, may also be present. The persistent vomiting can lead to electrolyte disturbances, such as hypochloremia, alkalosis, and mild hypokalemia.

Ultrasound is the preferred diagnostic tool for confirming pyloric stenosis. It can reveal specific criteria, including a pyloric muscle thickness greater than 3 mm, a pylorus longitudinal length greater than 15-17 mm, a pyloric volume greater than 1.5 cm3, and a pyloric transverse diameter greater than 13 mm.

The definitive treatment for pyloric stenosis is pyloromyotomy, a surgical procedure that involves making an incision in the thickened pyloric muscle to relieve the obstruction. Before surgery, it is important to correct any hypovolemia and electrolyte disturbances with intravenous fluids. Overall, pyloric stenosis is a relatively common condition in infants, but with prompt diagnosis and appropriate management, it can be effectively treated.

In patients of this age who have experienced a change in bowel habit, rectal bleeding, and weight loss, the most probable diagnosis is colorectal carcinoma. Considering the patient’s history and examination findings, the other options in this question are significantly less likely. It is crucial to refer this patient promptly to a specialized team that focuses on the treatment of lower gastrointestinal cancer.

This patient is displaying symptoms and signs that are consistent with community-acquired pneumonia (CAP). The most common cause of CAP in an adult patient who is otherwise in good health is Streptococcus pneumoniae.

When it comes to treating community-acquired pneumonia, the first-line antibiotic of choice is amoxicillin. According to the NICE guidelines, patients who are allergic to penicillin should be prescribed a macrolide (such as clarithromycin) or a tetracycline (such as doxycycline).

For more information, you can refer to the NICE guidelines on the diagnosis and management of pneumonia in adults.

The Act establishes five principles that aim to govern decisions made under the legislation:

1. Capacity is presumed unless proven otherwise: It is assumed that a person has the ability to make decisions unless it is proven that they lack capacity.

2. Assistance must be provided before determining incapacity: A person should not be considered unable to make a decision until all reasonable efforts have been made to support them in doing so.

3. Unwise decisions do not indicate incapacity: Making a decision that others may consider unwise does not automatically mean that a person lacks capacity.

4. Best interests must guide decision-making: All decisions made on behalf of an incapacitated person must be in their best interests.

5. Least restrictive approach should be taken: Decisions should be made in a way that minimizes any restrictions on the individual’s fundamental rights and freedoms.

If a decision significantly conflicts with these principles, it is unlikely to be lawful.

A person is deemed to lack capacity if they are unable to:

– Understand the relevant information related to the decision.
– Retain the information in their memory.
– Use or evaluate the information to make a decision.
– Communicate their decision effectively, using any means necessary.

When assessing capacity, it is important to consider the input of those close to the individual, if appropriate. Close friends and family may provide valuable insights, although their opinions should not unduly influence the assessment.

In urgent situations where a potentially life-saving decision needs to be made, an IMCA (Independent Mental Capacity Advocate) does not need to be involved.

The recommended drug doses for adult acute asthma are as follows:

– Salbutamol: Administer 5 mg using an oxygen-driven nebulizer.
– Ipratropium bromide: Deliver 500 mcg via an oxygen-driven nebulizer.
– Prednisolone: Take orally at a dose of 40-50 mg.
– Hydrocortisone: Administer 100 mg intravenously.
– Magnesium sulphate: Infuse 1.2-2 g intravenously over a period of 20 minutes.

Terbutaline can be used as an alternative to salbutamol, with a dose of 10 mg via an oxygen-driven nebulizer. Intravenous salbutamol may be considered (250 mcg IV slowly) only when inhaled therapy is not possible, such as when a patient is receiving bag-mask ventilation.

According to the current ALS guidelines, IV aminophylline may be considered in severe or life-threatening asthma, following senior advice. If used, a loading dose of 5 mg/kg should be given over 20 minutes, followed by an infusion of 500-700 mcg/kg/hour. It is important to maintain serum theophylline levels below 20 mcg/ml to prevent toxicity.

For more information, please refer to the BTS/SIGN Guideline on the Management of Asthma.

The NICE guidelines for suspected DVT state that if a person scores two points or more on the DVT Wells score, they are likely to have DVT. On the other hand, if a person scores one point or less, it is unlikely that they have DVT.

For individuals who are likely to have DVT, it is recommended to offer a proximal leg vein ultrasound scan with the results available within 4 hours if possible. However, if the ultrasound scan cannot be done within 4 hours, the following steps should be taken: a D-dimer test should be offered, followed by interim therapeutic anticoagulation. It is preferable to choose an anticoagulant that can be continued if DVT is confirmed. Additionally, a proximal leg vein ultrasound scan should be conducted with the results available within 24 hours.

For individuals who are unlikely to have DVT, it is advised to offer a D-dimer test with the results available within 4 hours. If obtaining the results within 4 hours is not possible, interim therapeutic anticoagulation should be provided while awaiting the result. If feasible, an anticoagulant that can be continued if DVT is confirmed should be chosen.

For more information, you can refer to the NICE Clinical Knowledge Summary on deep vein thrombosis.

Atopic dermatitis is a long-lasting inflammatory skin condition that is linked to increased levels of IgE in the bloodstream. It is also characterized by sensitivity to various allergens found in the air, food, and microorganisms.

Further Reading:

Eczema is a chronic inflammatory skin disease characterized by dry, itchy skin with eczematous lesions. It often follows a chronic relapsing course and can lead to chronic skin changes such as lichenification and pigment changes. The term eczema is often used interchangeably with dermatitis, but strictly speaking, dermatitis refers to inflammation of the skin while eczema refers to specific conditions where skin inflammation is a feature.

Atopic eczema, also known as atopic dermatitis, is the most common type of eczema. It is usually first diagnosed in young children, with 90% of cases diagnosed before the age of 5. However, it can affect individuals of any age. Symptoms often improve as patients progress into their teens and adulthood. Around 10-20% of children are affected by atopic eczema, but only 3% of adults experience symptoms.

The exact cause of atopic eczema is not fully understood, but it is believed to be multifactorial, with both genetic and environmental factors playing a role. Genetic defects in genes that aid in the functioning of the skin barrier have been identified, which may predispose individuals to breaks in the skin barrier and increased exposure to antigens. Environmental factors such as pollution, allergen exposure, climate, and others also contribute to the development of the disease.

Diagnosing atopic eczema involves assessing the presence of key clinical features, such as pruritus (itching), eczema/dermatitis in a pattern appropriate for age, early age of onset, and personal or family history of atopy. Various diagnostic criteria have been established to aid in the diagnosis, including those set out by the American Academy of Dermatology and the UK working party.

The severity of atopic eczema can vary, and treatment options depend on the severity. Mild cases may be managed with emollients (moisturizers) and mild potency topical corticosteroids. Moderate cases may require moderate potency topical corticosteroids, topical calcineurin inhibitors, and bandages. Severe cases may necessitate the use of potent topical corticosteroids, topical calcineurin inhibitors, bandages, phototherapy, and systemic therapy.

In addition to medical treatment, identifying and avoiding triggers is an important aspect of managing atopic eczema. Common triggers include irritants, contact allergens, certain foods, skin infections, inhalant triggers, stress and infection.

The guidelines from the European League Against Rheumatism (EULAR) regarding the diagnosis of gout state that if a joint becomes swollen, tender, and red, and if acute pain develops in that joint over a period of 6-12 hours, it is highly likely to be a crystal arthropathy. Pseudogout is also a possibility, but it is much less likely. In this case, gout is the most probable diagnosis.

The joint that is most commonly affected in acute gout is the first metatarsal-phalangeal joint, which accounts for 50-75% of cases.

The main cause of gout is hyperuricaemia, and the clinical diagnosis can be confirmed by the presence of negatively birefringent crystals in the synovial fluid aspirate.

For the treatment of acute gout attacks, NSAIDs or colchicine are generally used.