Defibrillation is a procedure used to treat two specific cardiac rhythms, ventricular fibrillation and pulseless ventricular tachycardia. It involves delivering an electrical shock randomly during the cardiac cycle to restore a normal heart rhythm. It is important to note that defibrillation is different from cardioversion, which involves delivering energy synchronized to the QRS complex.

Further Reading:

In the event of an adult experiencing cardiorespiratory arrest, it is crucial for doctors to be familiar with the Advanced Life Support (ALS) algorithm. They should also be knowledgeable about the proper technique for chest compressions, the appropriate rhythms for defibrillation, the reversible causes of arrest, and the drugs used in advanced life support.

During chest compressions, the rate should be between 100-120 compressions per minute, with a depth of compression of 5-6 cm. The ratio of chest compressions to rescue breaths should be 30:2. It is important to change the person giving compressions regularly to prevent fatigue.

There are two shockable ECG rhythms that doctors should be aware of: ventricular fibrillation (VF) and pulseless ventricular tachycardia (pVT). These rhythms require defibrillation.

There are four reversible causes of cardiorespiratory arrest, known as the 4 H’s and 4 T’s. The 4 H’s include hypoxia, hypovolemia, hypo or hyperkalemia or metabolic abnormalities, and hypothermia. The 4 T’s include thrombosis (coronary or pulmonary), tension pneumothorax, tamponade, and toxins. Identifying and treating these reversible causes is crucial for successful resuscitation.

When it comes to resus drugs, they are considered of secondary importance during CPR due to the lack of high-quality evidence for their efficacy. However, adrenaline (epinephrine) and amiodarone are the two drugs included in the ALS algorithm. Doctors should be familiar with the dosing, route, and timing of administration for both drugs.

Adrenaline should be administered intravenously at a concentration of 1 in 10,000 (100 micrograms/mL). It should be repeated every 3-5 minutes. Amiodarone is initially given at a dose of 300 mg, either from a pre-filled syringe or diluted in 20 mL of Glucose 5%. If required, an additional dose of 150 mg can be given by intravenous injection. This is followed by an intravenous infusion of 900 mg over 24 hours. The first dose of amiodarone is given after 3 shocks.

Thyroid storm, also known as thyrotoxic crisis, is a rare and potentially life-threatening complication of hyperthyroidism. The most common cause of thyroid storm is infection. Please refer to the yellow box at the bottom of the notes for additional information on thyroid storm.

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.

Heat stroke is a condition characterized by a systemic inflammatory response, where the core body temperature exceeds 40.6°C. It is accompanied by changes in mental state and varying levels of organ dysfunction. Heat stroke occurs when the body’s ability to regulate temperature is overwhelmed by a combination of excessive environmental heat, excessive heat production from metabolic processes (usually due to exertion), and inadequate heat loss.

It is important to consider other clinical conditions that can cause an increased core temperature. Sepsis can present similarly and should be ruled out. Neuroleptic malignant syndrome should be excluded in patients taking phenothiazines or other antipsychotics. Serotonin syndrome should be excluded in patients taking serotonergic medications such as SSRIs. Malignant hyperthermia should be considered in patients with a recent history of general anesthesia. Screening for recreational drug use, particularly cocaine, amphetamines, and ecstasy, is also recommended.

In patients with agitation and/or shivering, benzodiazepines (e.g. diazepam) can be beneficial. They help reduce excessive heat production and agitation. In severe cases of agitation, paralysis may be necessary. Dantrolene is commonly used, although there is currently limited high-level evidence supporting its use. Neuroleptics, such as chlorpromazine, which were once commonly used, should be avoided due to potential adverse effects.

Various cooling techniques are recommended, but there is currently insufficient evidence to determine the best approach. Simple measures like cold drinks, fanning, ice water packs, and spraying tepid water can be effective. Cold water immersion therapy may be helpful, but it requires patient stability and cooperation and may not be practical for critically ill patients. Advanced cooling techniques, such as cold IV fluids, surface cooling devices (SCD), intravascular cooling devices (ICD), and extracorporeal circuits, may be used for sicker patients.

Eosinophilic oesophagitis (EoE), also known as allergic inflammatory condition of the oesophagus, is characterized by the presence of eosinophils. It was identified as a clinical condition about two decades ago but has gained recognition more recently. EoE is most commonly observed in middle-aged individuals, with an average age of diagnosis ranging from 30 to 50 years. It is more prevalent in men, with a male-to-female ratio of 3:1. Allergic conditions, particularly atopy, are often associated with EoE.

The clinical manifestations of EoE vary depending on the age of the patient. In adults, common symptoms include dysphagia, food bolus obstruction, heartburn, and chest pain. On the other hand, children with EoE may present with failure to thrive, food refusal, difficulty feeding, vomiting, and abdominal pain.

To diagnose EoE, it is crucial to consider the possibility of this condition in patients who have persistent heartburn and/or difficulty swallowing, especially if they have a history of allergies or atopic disease. Diagnosis is confirmed by identifying more than 15 eosinophils per high-power field on an oesophageal biopsy. Allergy testing is not effective as EoE is not mediated by IgE.

There are three main management options for EoE, all of which are considered first-line treatments. The first option is proton pump inhibitors (PPIs), which are effective in approximately one-third of patients. If an endoscopic biopsy confirms the presence of eosinophils, an 8-week trial of PPIs can be initiated. After the trial, a repeat endoscopy and biopsy should be performed to assess for persistent eosinophils. Patients who respond to PPIs are diagnosed with PPI responsive oesophageal eosinophilia, while those who do not respond are diagnosed with true eosinophilic oesophagitis.

The second management option is dietary manipulation, which can be effective in both children and adults. It can be used as an initial treatment or in combination with pharmacological therapy. The six most commonly implicated food groups in EoE are cow’s milk, wheat, egg, soy, peanut/tree nut, and fish/shellfish. There are four main approaches to dietary manipulation: elemental diet, six food elimination diet (SFED), four food elimination diet (FFED),

Central retinal vein occlusion (CRVO) is a condition that usually leads to painless, one-sided vision loss. When examining the retina, it may appear similar to a ‘pizza thrown against a wall’, with swollen retinal veins, swelling of the optic disc, numerous flame-shaped hemorrhages, and cotton wool spots. Hypertension is present in about 65% of CRVO cases and is more common in individuals aged 65 and above.

On the other hand, branch retinal vein occlusion (BRVO) typically affects only one section of the retina, resulting in visual field deficits in that specific quadrant rather than complete vision loss.

Post-traumatic stress disorder (PTSD) develops after experiencing an extremely threatening or catastrophic event that would cause distress in almost anyone. It is important to note that PTSD does not develop from everyday upsetting situations like divorce, job loss, or failing an exam.

The most common symptom of PTSD is re-experiencing the traumatic event involuntarily and vividly. This can manifest as flashbacks, nightmares, repetitive distressing images or sensations, and physical symptoms such as pain, sweating, nausea, or trembling. Other notable features of PTSD include avoidance, rumination, hyperarousal, emotional numbing, irritability, and insomnia.

It is common for individuals with PTSD to also experience other mental health problems such as depression, anxiety, phobias, self-harming behaviors, and substance abuse.

The recommended treatments for PTSD are Eye Movement Desensitization and Reprocessing (EMDR) and Trauma-focused Cognitive Behavioral Therapy (CBT). These treatments should be offered to individuals of all ages, regardless of the time that has passed since the traumatic event. Typically, 8-12 sessions are recommended, but more may be necessary in cases involving multiple traumas, chronic disability, comorbidities, or social problems.

Septic arthritis occurs when an infectious agent invades a joint, causing it to become purulent. The main symptoms of septic arthritis include pain in the affected joint, redness, warmth, and swelling of the joint, and difficulty moving the joint. Patients may also experience fever and systemic upset. The most common cause of septic arthritis is Staphylococcus aureus, but other bacteria such as Streptococcus spp., Haemophilus influenzae, Neisseria gonorrhoea, and Escherichia coli can also be responsible.

According to the current recommendations by NICE and the BNF, the initial treatment for septic arthritis is flucloxacillin. However, if a patient is allergic to penicillin, clindamycin can be used instead. If there is a suspicion of MRSA infection, vancomycin is the recommended choice. In cases where gonococcal arthritis or a Gram-negative infection is suspected, cefotaxime is the preferred treatment. The suggested duration of treatment is typically 4-6 weeks, although it may be longer if the infection is complicated.

Acute kidney injury (AKI), previously known as acute renal failure, is a sudden decline in kidney function. This results in the accumulation of urea and other waste products in the body and disrupts the balance of fluids and electrolytes. 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 that develop outside of healthcare settings are due to pre-renal causes, accounting for 90% of cases. These causes typically involve low blood pressure associated with conditions like sepsis and fluid depletion. Medications, particularly ACE inhibitors and NSAIDs, are also frequently implicated.

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

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

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

Anaemia of chronic disease is a type of anaemia that can occur in various chronic conditions, such as rheumatoid arthritis, systemic lupus erythematosus, tuberculosis, malignancy, malnutrition, hypothyroidism, hypopituitarism, chronic kidney disease, and chronic liver disease. The underlying mechanisms of this type of anaemia are complex and not fully understood, with multiple contributing factors involved. One important mediator in inflammatory diseases like rheumatoid arthritis is interleukin-6 (IL-6). Increased levels of IL-6 lead to the production of hepcidin, a hormone that regulates iron balance. Hepcidin prevents the release of iron from the reticulo-endothelial system and affects other aspects of iron metabolism.

Anaemia of chronic disease typically presents as a normochromic, normocytic anaemia, although it can also be microcytic. It is characterized by reduced serum iron, reduced transferrin saturation, and reduced total iron-binding capacity (TIBC). However, the serum ferritin levels are usually normal or increased. Distinguishing anaemia of chronic disease from iron-deficiency anaemia can be challenging, but in iron-deficiency anaemia, the TIBC is typically elevated, and serum ferritin is usually low.

The tracheal opening can be classified using the Cormack-Lehane grading system. This system categorizes the views obtained through direct laryngoscopy based on the structures that are visible. More information about this classification system can be found in the notes provided below.

Further Reading:

A difficult airway refers to a situation where factors have been identified that make airway management more challenging. These factors can include body habitus, head and neck anatomy, mouth characteristics, jaw abnormalities, and neck mobility. The LEMON criteria can be used to predict difficult intubation by assessing these factors. The criteria include looking externally at these factors, evaluating the 3-3-2 rule which assesses the space in the mouth and neck, assessing the Mallampati score which measures the distance between the tongue base and roof of the mouth, and considering any upper airway obstructions or reduced neck mobility.

Direct laryngoscopy is a method used to visualize the larynx and assess the size of the tracheal opening. The Cormack-Lehane grading system can be used to classify the tracheal opening, with higher grades indicating more difficult access. In cases of a failed airway, where intubation attempts are unsuccessful and oxygenation cannot be maintained, the immediate priority is to oxygenate the patient and prevent hypoxic brain injury. This can be done through various measures such as using a bag-valve-mask ventilation, high flow oxygen, suctioning, and optimizing head positioning.

If oxygenation cannot be maintained, it is important to call for help from senior medical professionals and obtain a difficult airway trolley if not already available. If basic airway management techniques do not improve oxygenation, further intubation attempts may be considered using different equipment or techniques. If oxygen saturations remain below 90%, a surgical airway such as a cricothyroidotomy may be necessary.

Post-intubation hypoxia can occur for various reasons, and the mnemonic DOPES can be used to identify and address potential problems. DOPES stands for displacement of the endotracheal tube, obstruction, pneumothorax, equipment failure, and stacked breaths. If intubation attempts fail, a maximum of three attempts should be made before moving to an alternative plan, such as using a laryngeal mask airway or considering a cricothyroidotomy.

Renal colic, also known as ureteric colic, refers to a sudden and intense pain in the lower back caused by a blockage in the ureter, which is the tube that carries urine from the kidney to the bladder. This condition is commonly associated with the presence of a urinary tract stone.

The main symptoms of renal or ureteric colic include severe abdominal pain on one side, starting in the flank or loin area and radiating to the groin or testicle in men, or to the labia in women. The pain comes and goes in spasms, lasting for minutes to hours, with periods of no pain or a dull ache. Nausea, vomiting, and the presence of blood in the urine are often accompanying symptoms.

The pain experienced during renal or ureteric colic is often described as the most intense pain a person has ever felt, with many women comparing it to the pain of childbirth. Restlessness and an inability to find relief by lying still are common signs, which can help differentiate renal colic from peritonitis. Previous episodes of similar pain may also be reported by the individual. In cases where there is a concomitant urinary infection, fever and sweating may be present. Additionally, the person may complain of painful urination, frequent urination, and straining when the stone reaches the junction between the ureter and the bladder, as the stone irritates the detrusor muscle.

It is important to seek urgent medical attention if certain conditions are met. These include signs of systemic infection or sepsis, such as fever or sweating, or if the person is at a higher risk of acute kidney injury, such as having pre-existing chronic kidney disease, a solitary or transplanted kidney, or suspected bilateral obstructing stones. Hospital admission is also necessary if the person is dehydrated and unable to consume fluids orally due to nausea and/or vomiting. If there is uncertainty regarding the diagnosis, it is recommended to consult further resources, such as the NICE guidelines on the assessment and management of renal and ureteric stones.

In cases of conductive hearing loss, the Rinne test result is negative on the affected side, meaning that bone conduction is greater than air conduction. Additionally, the Weber test result will lateralize to the affected side. If the Weber test lateralizes to the right, it indicates either sensorineural hearing loss in the left ear (opposite side) or conductive hearing loss in the right ear (same side). A positive Rinne test result, where air conduction is greater than bone conduction, is typically seen in individuals with normal hearing or sensorineural hearing loss. In the case of conductive hearing loss in the right ear, a negative Rinne test result would be expected on the right side, indicating that bone conduction is greater than air conduction.

Further Reading:

Hearing loss is a common complaint that can be caused by various conditions affecting different parts of the ear and nervous system. The outer ear is the part of the ear outside the eardrum, while the middle ear is located between the eardrum and the cochlea. The inner ear is within the bony labyrinth and consists of the vestibule, semicircular canals, and cochlea. The vestibulocochlear nerve connects the inner ear to the brain.

Hearing loss can be classified based on severity, onset, and type. Severity is determined by the quietest sound that can be heard, measured in decibels. It can range from mild to profound deafness. Onset can be sudden, rapidly progressive, slowly progressive, or fluctuating. Type of hearing loss can be either conductive or sensorineural. Conductive hearing loss is caused by issues in the external ear, eardrum, or middle ear that disrupt sound transmission. Sensorineural hearing loss is caused by problems in the cochlea, auditory nerve, or higher auditory processing pathways.

To diagnose sensorineural and conductive deafness, a 512 Hz tuning fork is used to perform Rinne and Weber’s tests. These tests help determine the type of hearing loss based on the results. In Rinne’s test, air conduction (AC) and bone conduction (BC) are compared, while Weber’s test checks for sound lateralization.

Cholesteatoma is a condition characterized by the abnormal accumulation of skin cells in the middle ear or mastoid air cell spaces. It is believed to develop from a retraction pocket that traps squamous cells. Cholesteatoma can cause the accumulation of keratin and the destruction of adjacent bones and tissues due to the production of destructive enzymes. It can lead to mixed sensorineural and conductive deafness as it affects both the middle and inner ear.

Aortic dissection is a condition that occurs when the middle layer of the aorta, known as the tunica media, becomes weakened. This weakening leads to the development of cases of aortic dissection.

Further Reading:

Aortic dissection is a life-threatening condition in which blood flows through a tear in the innermost layer of the aorta, creating a false lumen. Prompt treatment is necessary as the mortality rate increases by 1-2% per hour. There are different classifications of aortic dissection, with the majority of cases being proximal. Risk factors for aortic dissection include hypertension, atherosclerosis, connective tissue disorders, family history, and certain medical procedures.

The presentation of aortic dissection typically includes sudden onset sharp chest pain, often described as tearing or ripping. Back pain and abdominal pain are also common, and the pain may radiate to the neck and arms. The clinical picture can vary depending on which aortic branches are affected, and complications such as organ ischemia, limb ischemia, stroke, myocardial infarction, and cardiac tamponade may occur. Common signs and symptoms include a blood pressure differential between limbs, pulse deficit, and a diastolic murmur.

Various investigations can be done to diagnose aortic dissection, including ECG, CXR, and CT with arterial contrast enhancement (CTA). CT is the investigation of choice due to its accuracy in diagnosis and classification. Other imaging techniques such as transoesophageal echocardiography (TOE), magnetic resonance imaging/angiography (MRI/MRA), and digital subtraction angiography (DSA) are less commonly used.

Management of aortic dissection involves pain relief, resuscitation measures, blood pressure control, and referral to a vascular or cardiothoracic team. Opioid analgesia should be given for pain relief, and resuscitation measures such as high flow oxygen and large bore IV access should be performed. Blood pressure control is crucial, and medications such as labetalol may be used to reduce systolic blood pressure. Hypotension carries a poor prognosis and may require careful fluid resuscitation. Treatment options depend on the type of dissection, with type A dissections typically requiring urgent surgery and type B dissections managed by thoracic endovascular aortic repair (TEVAR) and blood pressure control optimization.

The initial noticeable abnormality in sensory testing for diabetic neuropathy is often the loss of vibration sense. Reduced sensation, particularly in vibration sense, is typically the first symptom to be observed in diabetic neuropathy.

Further Reading:

Diabetic foot is a complication that can occur in individuals with diabetes due to long-standing high blood sugar levels. This leads to a process called glycation or glycosylation, where glucose binds to proteins and lipids in the body. Abnormal protein glycation can cause cellular dysfunction and various complications.

One of the main problems in diabetic foot is peripheral vascular disease and peripheral neuropathy. These conditions can result in significant foot issues, as trauma to the feet may go unnoticed and untreated. Vascular disease also impairs wound healing and increases the risk of developing ulcers.

Clinical features of diabetic foot include reduced sensation, especially to vibration, non-dermatomal sensory loss, foot deformities such as pes cavus and claw toes, and weak or absent foot pulses. It is important for diabetic patients to have their feet assessed regularly, at least annually, to identify any potential problems. Additional foot assessments should also be conducted during hospital admissions.

During a diabetic foot assessment, the healthcare provider should remove shoes, socks, and any bandages or dressings to examine both feet. They should assess for neuropathy using a 10 g monofilament to test foot sensation and check for limb ischemia by examining pulses and performing ankle brachial pressure index (ABPI) measurements. Any abnormal tissue, such as ulcers, calluses, infections, inflammation, deformities, or gangrene, should be documented. The risk of Charcot arthropathy should also be assessed.

The severity of foot ulcers in diabetic patients can be documented using standardized systems such as SINBAD or the University of Texas classification. The presence and severity of diabetic foot infection can be determined based on criteria such as local swelling, induration, erythema, tenderness, pain, warmth, and purulent discharge.

Management of foot ulcers involves offloading, control of foot infection, control of ischemia, wound debridement, and appropriate wound dressings. Antibiotics may be necessary depending on the severity of the infection. Diabetic patients with foot ulcers should undergo initial investigations including blood tests, wound swabs, and imaging to assess for possible osteomyelitis.

Charcot foot is a serious complication of diabetic peripheral neuropathy that results in progressive destructive arthropathy and foot deformity. Signs of Charcot foot include redness, swelling, warm skin, pain, and deformity. The hallmark deformity is midfoot collapse, known as the rocker-bottom foot.

Migraine without aura typically needs to meet the specific criteria set by the International Headache Society. These criteria include experiencing at least five attacks that meet the requirements outlined in criteria 2-4. The duration of these headache attacks should last between 4 to 72 hours. Additionally, the headache should exhibit at least two of the following characteristics: unilateral location, pulsating quality, moderate or severe pain intensity, and aggravation or avoidance of routine physical activity. Furthermore, during the headache, individuals should experience at least one of the following symptoms: nausea and/or vomiting, photophobia, and phonophobia. For more detailed information, you can refer to the guidelines provided by The British Association for the Study of Headache.

Compartment syndrome can occur when there are circumferential burns on the arms or legs. This typically happens with full thickness burns, where the burnt skin becomes stiff and compresses the compartment, making it difficult for blood to flow out. To treat this condition, escharotomy and possibly fasciotomy may be necessary.

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.

According to the GMC, if a doctor becomes aware that a patient is driving despite being unfit to do so, they should do everything they can to convince the patient to stop driving. If these efforts are unsuccessful and the patient continues to drive, the GMC advises promptly contacting the DVLA or DVA and sharing any pertinent medical information with the medical adviser, ensuring confidentiality.

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

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

Further Reading:

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

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

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

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

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

NICE has emphasized that certain symptoms and signs can indicate specific diseases as the underlying cause of a fever. In the case of meningococcal disease, the presence of a rash that does not fade when pressed upon (non-blanching rash) is particularly suggestive, especially if the child appears unwell, the lesions are larger than 2 mm in diameter (purpura), the capillary refill time is 3 seconds or longer, or there is neck stiffness. For more information, you can refer to the NICE guidelines on the assessment and initial management of fever in children under 5, as well as the NICE Clinical Knowledge Summary on the management of feverish children.

This patient has presented with a history consistent with retinal detachment preceded by posterior vitreous detachment.

Posterior vitreous detachment occurs when the vitreous membrane separates from the retina. There are several risk factors for posterior vitreous detachment, including myopia, recent cataract surgery, diabetes mellitus, increasing age, and eye trauma.

The main clinical features of posterior vitreous detachment include flashes of light (photopsia), increased numbers of floaters, a ring of floaters to the temporal side of central vision, and a feeling of heaviness in the eye. Another characteristic is Weiss’ ring, which is an irregular ring of translucent floating material in the vitreous.

It is important to note that there is a small associated risk of retinal detachment in the 6-12 weeks following a posterior vitreous detachment. Retinal detachment can be distinguished from posterior vitreous detachment by the presence of a dense shadow in the periphery that spreads centrally, a curtain drawing across the eye, straight lines suddenly appearing curved (positive Amsler grid test), and central visual loss with decreased visual acuity.

Given the patient’s presentation, an urgent referral to ophthalmology is necessary. In most cases of retinal detachment, surgical repair will be required.

Adrenal insufficiency, also known as Addison’s disease, is a condition that is more frequently observed in women and typically manifests in individuals aged 30-50 years. In the UK alone, nearly 9000 individuals have received a diagnosis for this disorder. While it can affect people of all ages, it predominantly occurs in women and those within the 30-50 age range.

Further Reading:

Addison’s disease, also known as primary adrenal insufficiency or hypoadrenalism, is a rare disorder caused by the destruction of the adrenal cortex. This leads to reduced production of glucocorticoids, mineralocorticoids, and adrenal androgens. The deficiency of cortisol results in increased production of adrenocorticotropic hormone (ACTH) due to reduced negative feedback to the pituitary gland. This condition can cause metabolic disturbances such as hyperkalemia, hyponatremia, hypercalcemia, and hypoglycemia.

The symptoms of Addison’s disease can vary but commonly include fatigue, weight loss, muscle weakness, and low blood pressure. It is more common in women and typically affects individuals between the ages of 30-50. The most common cause of primary hypoadrenalism in developed countries is autoimmune destruction of the adrenal glands. Other causes include tuberculosis, adrenal metastases, meningococcal septicaemia, HIV, and genetic disorders.

The diagnosis of Addison’s disease is often suspected based on low cortisol levels and electrolyte abnormalities. The adrenocorticotropic hormone stimulation test is commonly used for confirmation. Other investigations may include adrenal autoantibodies, imaging scans, and genetic screening.

Addisonian crisis is a potentially life-threatening condition that occurs when there is an acute deficiency of cortisol and aldosterone. It can be the first presentation of undiagnosed Addison’s disease. Precipitating factors of an Addisonian crisis include infection, dehydration, surgery, trauma, physiological stress, pregnancy, hypoglycemia, and acute withdrawal of long-term steroids. Symptoms of an Addisonian crisis include malaise, fatigue, nausea or vomiting, abdominal pain, fever, muscle pains, dehydration, confusion, and loss of consciousness.

There is no fixed consensus on diagnostic criteria for an Addisonian crisis, as symptoms are non-specific. Investigations may include blood tests, blood gas analysis, and septic screens if infection is suspected. Management involves administering hydrocortisone and fluids. Hydrocortisone is given parenterally, and the dosage varies depending on the age of the patient. Fluid resuscitation with saline is necessary to correct any electrolyte disturbances and maintain blood pressure. The underlying cause of the crisis should also be identified and treated. Close monitoring of sodium levels is important to prevent complications such as osmotic demyelination syndrome.

Thyroid storm is a rare condition that affects only 1-2% of patients with hyperthyroidism. However, it is crucial to diagnose it promptly because it has a high mortality rate of approximately 10%. Thyroid storm is often triggered by a physiological stressor, such as stopping antithyroid therapy prematurely, recent surgery or radio-iodine treatment, infections (especially chest infections), trauma, diabetic ketoacidosis or hyperosmolar diabetic crisis, thyroid hormone overdose, pre-eclampsia. It typically occurs in patients with Graves’ disease or toxic multinodular goitre and presents with sudden and severe hyperthyroidism. Symptoms include high fever (over 41°C), dehydration, rapid heart rate (greater than 140 beats per minute) with or without irregular heart rhythms, low blood pressure, congestive heart failure, nausea, jaundice, vomiting, diarrhea, abdominal pain, confusion, agitation, delirium, psychosis, seizures, or coma.

To diagnose thyroid storm, various blood tests should be conducted, including a full blood count, urea and electrolytes, blood glucose, coagulation screen, CRP, and thyroid profile (T4/T3 and TSH). A bone profile/calcium test should also be done as 10% of patients develop hypocalcemia. Blood cultures should be taken as well. Other important investigations include a urine dipstick/MC&S, chest X-ray, and ECG.

The management of thyroid storm involves several steps. Intravenous fluids, such as 1-2 liters of 0.9% saline, should be administered. Airway support and management should be provided as necessary. A nasogastric tube should be inserted if the patient is vomiting. Urgent referral for inpatient management is essential. Paracetamol (1 g PO/IV) can be given to reduce fever. Benzodiazepines, such as diazepam (5-20 mg PO/IV), can be used for sedation. Steroids, like hydrocortisone (100 mg IV), may be necessary if there is co-existing adrenal suppression. Antibiotics should be prescribed if there is an intercurrent infection. Beta-blockers, such as propranolol (80 mg PO), can help control heart rate. High-dose carbimazole (45-60 mg/day) is recommended.

The superior orbital fissure is a gap in the back wall of the orbit, created by the space between the greater and lesser wings of the sphenoid bone. Several structures pass through it to enter the orbit, starting from the top and going downwards. These include the lacrimal nerve (a branch of CN V1), the frontal nerve (another branch of CN V1), the superior ophthalmic vein, the trochlear nerve (CN IV), the superior division of the oculomotor nerve (CN III), the nasociliary nerve (a branch of CN V1), the inferior division of the oculomotor nerve (CN III), the abducens nerve (CN VI), and the inferior ophthalmic vein.

Adjacent to the superior orbital fissure, on the back wall of the orbit and towards the middle, is the optic canal. The optic nerve (CN II) exits the orbit through this canal, along with the ophthalmic artery.

Superior orbital fissure syndrome (SOFS) is a condition characterized by a combination of symptoms and signs that occur when cranial nerves III, IV, V1, and VI are compressed or injured as they pass through the superior orbital fissure. This condition also leads to swelling and protrusion of the eye due to impaired drainage and congestion. The main causes of SOFS are trauma, tumors, and inflammation. It is important to note that CN II is not affected by this syndrome, as it follows a separate path through the optic canal.

Atropine is a medication that slows down the movement of the digestive system and is not recommended for use in individuals with intestinal blockage. It works by blocking the effects of a neurotransmitter called acetylcholine, which is responsible for promoting gastrointestinal motility and the emptying of the stomach. Therefore, atropine should not be given to patients with gastrointestinal obstruction as it can further hinder the movement of the intestines.

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Types of Heart Block:

1. Atrioventricular (AV) Blocks:
– Disrupt electrical conduction between the atria and ventricles at the AV node.
– Three degrees of AV block: first degree, second degree (type 1 and type 2), and third degree (complete) AV block.

– First degree AV block: PR interval > 0.2 seconds.
– Second degree AV block:
– Type 1 (Mobitz I, Wenckebach): progressive prolongation of the PR interval until a dropped beat occurs.
– Type 2 (Mobitz II): PR interval is constant, but the P wave is often not followed by a QRS complex.
– Third degree (complete) AV block: no association between the P waves and QRS complexes.

Features of complete heart block: syncope, heart failure, regular bradycardia (30-50 bpm), wide pulse pressure, JVP (jugular venous pressure) cannon waves in neck, variable intensity of S1.

2. Bundle Branch Blocks:
– Electrical conduction travels from the bundle of His to the left and right bundle branches.
– Diagnosed when the duration of the QRS complex on the ECG exceeds 120 ms.

– Right bundle branch block (RBBB).
– Left bundle branch block (LBBB).
– Left anterior fascicular block (LAFB).
– Left posterior fascicular block (LPFB).
– Bifascicular block.
– Trifascicular block.

ECG features of bundle branch blocks:
– RBBB: QRS duration > 120 ms, RSR’ pattern in V1-3 (M-shaped QRS complex), wide S wave in lateral leads (I, aVL, V5-6).
– LBBB: QRS duration > 120 ms, dominant S wave in V1, broad, notched (‘M’-shaped) R wave in V6, broad monophasic R wave in lateral leads (I, aVL, V5-6), absence of Q waves in lateral leads, prolonged R wave peak time > 60 ms in leads V5-6.

WiLLiaM MaRROW is a useful mnemonic for remembering the morphology of the QRS in leads V1 and V6 for LBBB.

Transfusion-associated circulatory overload (TACO) is a reaction that occurs when a large volume of blood is infused rapidly. It is the second leading cause of deaths related to transfusions, accounting for about 20% of all fatalities.

TACO typically happens in patients with limited cardiac reserve or chronic anemia who receive a fast blood transfusion. Elderly individuals, infants, and severely anemic patients are particularly vulnerable.

The common signs of TACO include acute respiratory distress, rapid heartbeat, high blood pressure, the appearance of acute or worsening fluid accumulation in the lungs on a chest X-ray, and evidence of excessive fluid retention.

The B-type natriuretic peptide (BNP) can be a helpful diagnostic tool for TACO. Usually, the BNP level is elevated to at least 1.5 times the baseline before the transfusion.

In many cases, simply slowing down the rate of transfusion, positioning the patient upright, and administering diuretics will be sufficient. In more severe cases, the transfusion should be stopped, and non-invasive ventilation may be considered.

Acute kidney injury (AKI), previously known as acute renal failure, is a sudden decline in kidney function. This leads to the accumulation of urea and other waste products in the body, as well as disturbances in fluid balance and electrolyte levels. 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, affecting approximately 15% of adults admitted to hospitals in the UK.

AKI is categorized into three stages based on specific criteria. In stage 1, there is a rise in creatinine levels of 26 micromol/L or more within 48 hours, or a rise of 50-99% from the baseline within 7 days. Additionally, a urine output of less than 0.5 mL/kg/hour for more than 6 hours is indicative of stage 1 AKI.

Stage 2 AKI is characterized by a creatinine rise of 100-199% from the baseline within 7 days, or a urine output of less than 0.5 mL/kg/hour for more than 12 hours.

The most severe stage, stage 3 AKI, is identified by a creatinine rise of 200% or more from the baseline within 7 days. It can also be diagnosed if the creatinine level reaches 354 micromol/L or more with an acute rise of 26 micromol/L or more within 48 hours, or a rise of 50% or more within 7 days. Additionally, a urine output of less than 0.3 mL/kg/hour for 24 hours or anuria (no urine production) for 12 hours is indicative of stage 3 AKI.

The diagnosis in this case is clearly gout. According to the guidelines from the European League Against Rheumatism (EULAR), the development of sudden joint pain accompanied by swelling, tenderness, and redness, which worsens over a period of 6-12 hours, strongly suggests crystal arthropathy.

Checking serum urate levels to confirm high levels of uric acid before starting treatment for acute gout attacks is not very beneficial and should not delay treatment. While these levels can be useful for monitoring treatment response, they often decrease during an acute attack and can even be normal. If levels are checked and found to be normal during an attack, they should be rechecked once the attack has resolved.

The first-line treatment for acute gout attacks is non-steroidal anti-inflammatory drugs (NSAIDs) like naproxen. However, caution should be exercised when using NSAIDs in patients with a history of hypertension. Since this patient has had difficulty controlling their blood pressure and remains hypertensive, it would be wise to avoid NSAIDs in this case.

Colchicine is an effective alternative for treating gout, although it may take longer to take effect. It is often used in patients who cannot take NSAIDs due to contraindications, such as hypertension or a history of peptic ulcer disease. It’s important to note that colchicine can have effects on the bone marrow, leading to an increase in neutrophils and a decrease in platelets. Therefore, it should not be used in patients with blood disorders, as is the case with this patient.

Allopurinol should not be used during an acute gout attack as it can prolong the attack and even trigger another acute attack. If a patient is already taking allopurinol, it should be continued, and the acute attack should be treated with NSAIDs, colchicine, or corticosteroids as appropriate.

Corticosteroids are an effective alternative for managing acute gout in patients who cannot take NSAIDs or colchicine. They can be administered orally, intramuscularly, intravenously, or directly into the affected joint. In this patient’s case, using corticosteroids would be the safest and most reasonable treatment option.

The therapeutic range for lithium typically falls between 0.4-0.8 mmol/l, although this range may differ depending on the laboratory. In general, the lower end of the range is the desired level for maintenance therapy and treatment in older individuals. Toxic effects are typically observed when levels exceed 1.5 mmol/l.

This patient is displaying symptoms and signs that are consistent with a diagnosis of acute pyelonephritis. Additionally, she is showing signs of sepsis and is pregnant, which makes it necessary to admit her for inpatient treatment.

According to the National Institute for Health and Care Excellence (NICE), patients with pyelonephritis should be admitted if it is severe or if they exhibit any signs or symptoms that suggest a more serious illness or condition, such as sepsis. Signs of sepsis include significant tachycardia, hypotension, or breathlessness, as well as marked signs of illness like impaired level of consciousness, profuse sweating, rigors, pallor, or significantly reduced mobility. A temperature greater than 38°C or less than 36°C is also indicative of sepsis.

NICE also recommends considering referral or seeking specialist advice for individuals with acute pyelonephritis if they are significantly dehydrated or unable to take oral fluids and medicines, if they are pregnant, if they have a higher risk of developing complications due to known or suspected structural or functional abnormalities of the genitourinary tract or underlying diseases like diabetes mellitus or immunosuppression, or if they have recurrent episodes of urinary tract infections (UTIs).

For non-pregnant women and men, the recommended choice of antibacterial therapy is as follows: oral first-line options include cefalexin, ciprofloxacin, or co-amoxiclav (taking into account local microbial resistance data), and intravenous first-line options (if severely unwell or unable to take oral treatment) include amikacin, ceftriaxone, cefuroxime, ciprofloxacin, or gentamicin. Co-amoxiclav may be used if given in combination or if sensitivity is known. Antibacterials may be combined if there are concerns about susceptibility or sepsis. For intravenous second-line options, it is recommended to consult a local microbiologist.

For pregnant women, the recommended choice of antibacterial therapy is as follows: oral first-line option is cefalexin, and intravenous first-line option (if severely unwell or unable to take oral treatment) is cefuroxime. Intravenous second-line options or combining antibacterials should be considered if there are concerns about susceptibility or sepsis, and consultation with a local microbiologist is recommended.

A pneumothorax is an abnormal collection of air in the pleural cavity of the lung. It can be classified by cause as primary spontaneous, secondary spontaneous, or traumatic. Primary spontaneous pneumothorax occurs without any obvious cause in the absence of underlying lung disease, while secondary spontaneous pneumothorax occurs in patients with significant underlying lung diseases. Traumatic pneumothorax is caused by trauma to the lung, often from blunt or penetrating chest wall injuries.

Tension pneumothorax is a life-threatening condition where the collection of air in the pleural cavity expands and compresses normal lung tissue and mediastinal structures. It can be caused by any of the aforementioned types of pneumothorax. Immediate management of tension pneumothorax involves the ABCDE approach, which includes ensuring a patent airway, controlling the C-spine, providing supplemental oxygen, establishing IV access for fluid resuscitation, and assessing and managing other injuries.

Treatment of tension pneumothorax involves needle thoracocentesis as a temporary measure to provide immediate decompression, followed by tube thoracostomy as definitive management. Needle thoracocentesis involves inserting a 14g cannula into the pleural space, typically via the 4th or 5th intercostal space midaxillary line. If the patient is peri-arrest, immediate thoracostomy is advised.

The pathophysiology of tension pneumothorax involves disruption to the visceral or parietal pleura, allowing air to flow into the pleural space. This can occur through an injury to the lung parenchyma and visceral pleura, or through an entry wound to the external chest wall in the case of a sucking pneumothorax. Injured tissue forms a one-way valve, allowing air to enter the pleural space with inhalation but prohibiting air outflow. This leads to a progressive increase in the volume of non-absorbable intrapleural air with each inspiration, causing pleural volume and pressure to rise within the affected hemithorax.