Psittacosis is a type of infection that can be transmitted from animals to humans, caused by a bacterium called Chlamydia psittaci. It is most commonly seen in people who own domestic birds, as well as those who work in pet shops or zoos. The typical symptoms of psittacosis include pneumonia that is acquired within the community, along with flu-like symptoms. Many patients also experience severe headaches and sensitivity to light. Enlargement of the spleen is a common finding in about two-thirds of individuals with this infection.

Infected individuals often develop a rash on their face, known as Horder’s spots, which appear as reddish macules. In some cases, erythema nodosum and erythema multiforme may also occur. The recommended treatment for psittacosis is a course of tetracycline or doxycycline for a period of 2-3 weeks.

On the other hand, rose spots are typically observed in cases of typhoid fever. These spots have a similar appearance to Horder’s spots but are usually found on the trunk rather than the face. Erythema marginatum is a pale red rash seen in rheumatic fever, while malar flush, also known as ‘mitral facies’, refers to the reddish discoloration of the cheeks commonly seen in individuals with mitral stenosis. Lastly, erythema chronicum migrans is the distinctive rash seen in Lyme disease, characterized by a circular rash with a central ‘bulls-eye’ appearance that spreads outward from the site of a tick bite.

Central retinal vein occlusion (CRVO) typically results in painless, one-sided vision loss. On fundoscopic examination, the retina displays a distinct appearance resembling a ‘pizza thrown against a wall’. This includes engorged retinal veins, swelling of the optic disc, multiple flame-shaped hemorrhages, and cotton wool spots. Hypertension is present in about 65% of CRVO patients, and it is more common in individuals over 65 years old.

In contrast, central retinal artery occlusion (CRAO) also causes sudden, painless, one-sided vision loss. However, the retina’s appearance in CRAO is different from CRVO. It appears pale, with narrowed blood vessels. A notable feature is the presence of a ‘cherry-red spot’ at the center of the macula, which is supplied by the underlying choroid. Examination often reveals an afferent pupillary defect.

Vitreous hemorrhage occurs when there is bleeding into the middle chamber of the eye, known as the vitreous. This can be caused by conditions such as proliferative diabetic retinopathy, trauma, or retinal detachment. The appearance of vitreous hemorrhage is described as ‘blood within a bloodless gel’, resulting in a diffuse red appearance of the retina. Unlike CRVO, there are no focal flame-shaped hemorrhages.

Diabetic maculopathy refers to the presence of diabetic eye disease within a one-disc diameter of the macula.

Wet age-related macular degeneration (ARMD) causes vision loss due to choroidal neovascularization, which leads to leakage of blood and protein beneath the macula. While there may be hemorrhages visible on the retina, the overall appearance does not match the description provided in the question.

When giving chest compressions to an adult, it is important to compress the sternum to a depth of 5-6 cm. The resuscitation council updated their guidance in 2015 and now recommends a ratio of 30 chest compressions to 2 rescue breaths. It is worth noting that according to the algorithm, checking for a pulse is no longer necessary in the latest BLS sequence. The chest compressions should be administered at a rate of 100-120 per minute, with a ratio of 30 compressions to 2 rescue breaths.

Further Reading:

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

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

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

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

The duration of the pause in chest compressions should be kept short, not exceeding 5 seconds. This applies to both pausing to assess the rhythm and pausing to administer a shock if the rhythm is deemed shockable. It is important to note that a pulse check lasting less than two seconds may fail to detect a palpable pulse, particularly in individuals with a slow heart rate (bradycardia).

Further Reading:

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

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

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

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

Moderate hypothermia is indicated by core temperatures ranging from 28-32ºC.

Further Reading:

Hypothermia is defined as a core temperature below 35ºC and can be graded as mild, moderate, severe, or profound based on the core temperature. When the core temperature drops, the basal metabolic rate decreases and cell signaling between neurons decreases, leading to reduced tissue perfusion. This can result in depressed myocardial contractility, vasoconstriction, ventilation-perfusion mismatch, and increased blood viscosity. Symptoms of hypothermia progress as the core temperature drops, starting with compensatory increases in heart rate and shivering, and eventually leading to bradyarrhythmias, prolonged PR, QRS, and QT intervals, and cardiac arrest.

In the management of hypothermic cardiac arrest, ALS should be initiated with some modifications. The pulse check during CPR should be prolonged to 1 minute due to difficulty in obtaining a pulse. Rewarming the patient is important, and mechanical ventilation may be necessary due to stiffness of the chest wall. Drug metabolism is slowed in hypothermic patients, so dosing of drugs should be adjusted or withheld. Electrolyte disturbances are common in hypothermic patients and should be corrected.

Frostbite refers to a freezing injury to human tissue and occurs when tissue temperature drops below 0ºC. It can be classified as superficial or deep, with superficial frostbite affecting the skin and subcutaneous tissues, and deep frostbite affecting bones, joints, and tendons. Frostbite can be classified from 1st to 4th degree based on the severity of the injury. Risk factors for frostbite include environmental factors such as cold weather exposure and medical factors such as peripheral vascular disease and diabetes.

Signs and symptoms of frostbite include skin changes, cold sensation or firmness to the affected area, stinging, burning, or numbness, clumsiness of the affected extremity, and excessive sweating, hyperemia, and tissue gangrene. Frostbite is diagnosed clinically and imaging may be used in some cases to assess perfusion or visualize occluded vessels. Management involves moving the patient to a warm environment, removing wet clothing, and rapidly rewarming the affected tissue. Analgesia should be given as reperfusion is painful, and blisters should be de-roofed and aloe vera applied. Compartment syndrome is a risk and should be monitored for. Severe cases may require surgical debridement of amputation.

Discitis is an infection that affects the space between the intervertebral discs in the spine. This condition can have serious consequences, including the formation of abscesses and sepsis. The most common cause of discitis is usually Staphylococcus aureus, but other organisms like Streptococcus viridans and Pseudomonas aeruginosa may be responsible in intravenous drug users and those with weakened immune systems. Gram-negative organisms such as Escherichia coli and Mycobacterium tuberculosis can also cause discitis.

There are several risk factors that increase the likelihood of developing discitis. These include having undergone spinal surgery (which occurs in 1-2% of cases post-operatively), having an immunodeficiency, being an intravenous drug user, being under the age of eight, having diabetes mellitus, or having a malignancy.

The typical symptoms of discitis include back or neck pain (which occurs in over 90% of cases), pain that often wakes the patient from sleep, fever (present in 60-70% of cases), and neurological deficits (which can occur in up to 50% of cases). In children, refusal to walk may also be a symptom.

When diagnosing discitis, MRI is the preferred imaging modality due to its high sensitivity and specificity. It is important to image the entire spine, as discitis often affects multiple levels. Plain radiographs are not very sensitive to the early changes of discitis and may appear normal for 2-4 weeks. CT scanning is also not very sensitive in detecting discitis.

Treatment for discitis involves admission to the hospital for intravenous antibiotics. Before starting the antibiotics, it is important to send three sets of blood cultures and a full set of blood tests, including a CRP, to the lab. The choice of antibiotics depends on the specific situation. A typical antibiotic regimen for discitis may include IV flucloxacillin as the first-line treatment if there is no penicillin allergy, IV vancomycin if the infection was acquired in the hospital or there is a high risk of MRSA, and possibly IV gentamicin if there is a possibility of a Gram-negative infection. In cases where there is acute kidney injury and Gram-negative cover is required, IV piperacillin-tazobactam alone may be used.

Hypothermia occurs when the core body temperature drops below 35°C. It is categorized as mild (32-35°C), moderate (28-32°C), or severe (<28°C). Rescuers at the scene can use the Swiss staging system to describe the condition of victims. The stages range from clearly conscious and shivering to unconscious and not breathing, with death due to irreversible hypothermia being the most severe stage. There are several risk factors for hypothermia, including environmental exposure, unsatisfactory housing, poverty, lack of cold awareness, drugs, alcohol, acute confusion, hypothyroidism, and sepsis. The clinical features of hypothermia vary depending on the severity. At 32-35°C, symptoms may include apathy, amnesia, ataxia, and dysarthria. At 30-32°C, there may be a decreased level of consciousness, hypotension, arrhythmias, respiratory depression, and muscular rigidity. Below 30°C, ventricular fibrillation may occur, especially with excessive movement or invasive procedures. Diagnosing hypothermia involves checking the core temperature using an oesophageal, rectal, or tympanic probe with a low reading thermometer. Rectal and tympanic temperatures may lag behind core temperature and are unreliable in hypothermia. Various investigations should be carried out, including blood tests, blood glucose, amylase, blood cultures, arterial blood gas, ECG, chest X-ray, and CT head if there is suspicion of head injury or CVA. The management of hypothermia involves supporting the ABCs, treating the patient in a warm room, removing wet clothes and drying the skin, monitoring the ECG, providing warmed, humidified oxygen, correcting hypoglycemia with IV glucose, and handling the patient gently to avoid VF arrest. Rewarming methods include passive Rewarming with warm blankets or Bair hugger/polythene sheets, surface Rewarming with a water bath, core Rewarming with heated, humidified oxygen or peritoneal lavage, and extracorporeal Rewarming via cardiopulmonary bypass for severe hypothermia/cardiac arrest. In the case of hypothermic cardiac arrest, CPR should be performed with chest compressions and ventilations at standard rates.

Acute bacterial prostatitis is a sudden inflammation of the prostate gland, which can be either focal or diffuse and is characterized by the presence of pus. The most common organisms that cause this condition include Escherichia coli, Streptococcus faecalis, Staphylococcus aureus, and Neisseria gonorrhoea. The infection usually reaches the prostate through direct extension from the posterior urethra or urinary bladder, but it can also spread through the blood or lymphatics. In some cases, the infection may originate from the rectum.

According to the National Institute for Health and Care Excellence (NICE), acute prostatitis should be suspected in men who present with a sudden onset of feverish illness, which may be accompanied by rigors, arthralgia, or myalgia. Irritative urinary symptoms like dysuria, frequency, urgency, or acute urinary retention are also common. Perineal or suprapubic pain, as well as penile pain, low back pain, pain during ejaculation, and pain during bowel movements, can occur. A rectal examination may reveal an exquisitely tender prostate. A urine dipstick test showing white blood cells and a urine culture confirming urinary infection are also indicative of acute prostatitis.

The current recommendations by NICE and the British National Formulary (BNF) for the treatment of acute prostatitis involve prescribing an oral antibiotic for a duration of 14 days, taking into consideration local antimicrobial resistance data. The first-line antibiotics recommended are Ciprofloxacin 500 mg twice daily or Ofloxacin 200 mg twice daily. If these are not suitable, Trimethoprim 200 mg twice daily can be used. Second-line options include Levofloxacin 500 mg once daily or Co-trimoxazole 960 mg twice daily, but only when there is bacteriological evidence of sensitivity and valid reasons to prefer this combination over a single antibiotic.

For more information, you can refer to the NICE Clinical Knowledge Summary on acute prostatitis.

Occlusion of the posterior inferior cerebellar artery leads to the development of lateral medullary syndrome, also known as Wallenberg’s syndrome. This condition is characterized by several distinct symptoms. Firstly, there is a loss of pain and temperature sensation on the opposite side of the body, which occurs due to damage to the spinothalamic tracts. Additionally, there is a loss of pain and temperature sensation on the same side of the face, resulting from damage to the fifth cranial nerve (CN V).

Furthermore, individuals with lateral medullary syndrome may experience vertigo, nystagmus, tinnitus, deafness, and vomiting. These symptoms arise from damage to the eighth cranial nerve (CN VIII). Lastly, the syndrome may also present with Horner’s syndrome, which is caused by damage to the descending hypothalamospinal tract.

In summary, occlusion of the posterior inferior cerebellar artery causes lateral medullary syndrome, leading to a combination of symptoms including sensory loss, vertigo, tinnitus, and Horner’s syndrome.

Generally speaking, if a child shows clinical signs of dehydration but does not exhibit shock, it can be assumed that they are 5% dehydrated. On the other hand, if shock is also present, it can be assumed that the child is 10% dehydrated or more. When we say 5% dehydration, it means that the body has lost 5 grams per 100 grams of body weight, which is equivalent to 50 milliliters per kilogram of fluid. Similarly, 10% dehydration implies a fluid loss of 100 milliliters per kilogram of fluid.

In the case of this child, they are 10% dehydrated, which means they have lost 100 milliliters per kilogram of fluid. Considering their weight of 30 kilograms, their estimated fluid loss amounts to 100 multiplied by 30, which equals 3000 milliliters.

Since this child is also in shock, they should receive a fluid bolus of 20 milliliters per kilogram. Therefore, the initial volume of fluid to administer would be 20 multiplied by 30 milliliters, resulting in 600 milliliters.

To summarize the clinical features of dehydration and shock, please refer below:

Dehydration (5%):
– The child appears unwell
– Normal heart rate or tachycardia
– Normal respiratory rate or tachypnea
– Normal peripheral pulses
– Normal or mildly prolonged capillary refill time (CRT)
– Normal blood pressure
– Warm extremities
– Decreased urine output
– Reduced skin turgor
– Sunken eyes
– Depressed fontanelle
– Dry mucous membranes

Clinical shock (10%):
– Pale, lethargic, mottled appearance
– Tachycardia
– Tachypnea
– Weak peripheral pulses
– Prolonged capillary refill time (CRT)
– Hypotension
– Cold extremities
– Decreased urine output
– Decreased level of consciousness

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

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

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

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

This patient’s history is indicative of episodic tension-type headache. Chronic tension-type headache is defined as experiencing headaches on more than 15 days per month.

Migraine with typical aura presents with temporary visual disturbances such as hemianopia or scintillating scotoma that spreads. Migraine without aura must meet the criteria set by the International Headache Society, which are outlined below:

1. The patient must have at least five attacks that meet criteria 2-4.
2. The duration of each headache attack should be between 4 and 72 hours.
3. The headache must have at least two of the following characteristics:
– Located on one side of the head
– Pulsating quality
– Moderate or severe pain intensity
– Aggravation or avoidance of routine physical activity (e.g., walking or climbing stairs)
4. During the headache, the patient must experience at least one of the following:
– Nausea and/or vomiting
– Sensitivity to light (photophobia) and sound (phonophobia)
5. The headache should not be attributed to another disorder.

Medication overuse headache is suspected when a patient uses multiple medications, often at low doses, without experiencing any relief from their headaches. Combination medications containing barbiturates, codeine, and caffeine are frequently involved. The diagnosis can only be confirmed when the symptoms improve after discontinuing the medication.

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.

This patient is displaying symptoms consistent with hyperthyroidism, including palpitations or a fast heart rate, anxiety, clubbing, tremors, and heat intolerance. Other common symptoms of hyperthyroidism include eye signs such as proptosis and lid retraction, weight loss, pretibial myxoedema, diarrhea, increased appetite, and irregular menstrual periods. It is important to note that while some of these symptoms can also occur in phaeochromocytoma, this condition is rare and typically accompanied by high blood pressure.

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. hypotension, hypoventilation, altered mental state, seizures and/or coma.

Addison’s disease occurs when the adrenal glands do not produce enough steroid hormones. This includes glucocorticoids, mineralocorticoids, and sex steroids. The most common cause is autoimmune adrenalitis, which accounts for about 70-80% of cases. It is more prevalent in women and typically occurs between the ages of 30 and 50.

The clinical symptoms of Addison’s disease include weakness, lethargy, low blood pressure (especially when standing up), nausea, vomiting, weight loss, reduced hair in the armpits and pubic area, depression, and hyperpigmentation (darkening of the skin in certain areas like the palms, mouth, and exposed skin).

Biochemically, Addison’s disease is characterized by increased levels of ACTH (a hormone that tries to stimulate the adrenal glands), low sodium levels, high potassium levels, high calcium levels, low blood sugar, and metabolic acidosis.

People with Addison’s disease have a higher risk of developing type 1 diabetes, Hashimoto’s thyroiditis, Grave’s disease, premature ovarian failure, pernicious anemia, vitiligo, and alopecia.

Management of Addison’s disease should be overseen by an Endocrinologist. Treatment typically involves taking hydrocortisone, fludrocortisone, and dehydroepiandrosterone. Some patients may also need thyroxine if there is hypothalamic-pituitary disease present. Treatment is lifelong, and patients should carry a steroid card and a MedicAlert bracelet in case of an Addisonian crisis.

The primary symptom typically associated with carbon monoxide poisoning is a headache.

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.

Gastroenteritis is a common condition in children, particularly those under the age of 5. It is characterized by the sudden onset of diarrhea, with or without vomiting. The most common cause of gastroenteritis in infants and young children is rotavirus, although other viruses, bacteria, and parasites can also be responsible. Prior to the introduction of the rotavirus vaccine in 2013, rotavirus was the leading cause of gastroenteritis in children under 5 in the UK. However, the vaccine has led to a significant decrease in cases, with a drop of over 70% in subsequent years.

Norovirus is the most common cause of gastroenteritis in adults, but it also accounts for a significant number of cases in children. In England & Wales, there are approximately 8,000 cases of norovirus each year, with 15-20% of these cases occurring in children under 9.

When assessing a child with gastroenteritis, it is important to consider whether there may be another more serious underlying cause for their symptoms. Dehydration assessment is also crucial, as some children may require intravenous fluids. The NICE traffic light system can be used to identify the risk of serious illness in children under 5.

In terms of investigations, stool microbiological testing may be indicated in certain cases, such as when the patient has been abroad, if diarrhea lasts for more than 7 days, or if there is uncertainty over the diagnosis. U&Es may be necessary if intravenous fluid therapy is required or if there are symptoms and/or signs suggestive of hypernatremia. Blood cultures may be indicated if sepsis is suspected or if antibiotic therapy is planned.

Fluid management is a key aspect of treating children with gastroenteritis. In children without clinical dehydration, normal oral fluid intake should be encouraged, and oral rehydration solution (ORS) supplements may be considered. For children with dehydration, ORS solution is the preferred method of rehydration, unless intravenous fluid therapy is necessary. Intravenous fluids may be required for children with shock or those who are unable to tolerate ORS solution.

Antibiotics are generally not required for gastroenteritis in children, as most cases are viral or self-limiting. However, there are some exceptions, such as suspected or confirmed sepsis, Extraintestinal spread of bacterial infection, or specific infections like Clostridium difficile-associated pseudomembranous enterocolitis or giardiasis.

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

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

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

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

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

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

Women have three options when requesting emergency contraception. The first option is Levonelle 1.5 mg, which contains levonorgestrel and can be used up to 72 hours after unprotected sexual intercourse (UPSI). If vomiting occurs within 2 hours of taking the tablet, another one should be given. Levonelle mainly works by preventing ovulation.

The second option is ulipristal acetate, the newest treatment available. It can be used up to 120 hours after UPSI. If vomiting occurs within 3 hours of ingestion, another tablet should be given. Ulipristal acetate also works by inhibiting ovulation. However, it should be avoided in patients taking enzyme-inducing drugs, those with severe hepatic impairment, or those with severe asthma requiring oral steroids.

The third option is the copper IUD, which can be fitted up to 5 days after UPSI or ovulation, whichever is longer. The failure rate of the copper IUD is less than 1 in 1000, making it 10-20 times more effective than oral emergency contraceptive options. It is important to note that Levonelle and ulipristal may be less effective in women with higher BMIs.

The most probable diagnosis in this situation is Goodpasture’s syndrome, a rare autoimmune vasculitic disorder characterized by three main symptoms: pulmonary hemorrhage, glomerulonephritis, and the presence of anti-glomerular basement membrane (Anti-GBM) antibodies. Goodpasture’s syndrome is more prevalent in men, particularly in smokers. It is also associated with HLA-B7 and HLA-DRw2.

The clinical manifestations of Goodpasture’s syndrome include constitutional symptoms like fever, fatigue, nausea, and weight loss. Patients may also experience hemoptysis or pulmonary hemorrhage, chest pain, breathlessness, and inspiratory crackles at the lung bases. Anemia due to bleeding within the lungs, arthralgia, rapidly progressive glomerulonephritis, hematuria, hypertension, and rarely hepatosplenomegaly may also be present.

Blood tests will reveal iron deficiency anemia, an elevated white cell count, and renal impairment. Elisa for Anti-GBM antibodies is highly sensitive and specific, but it is not widely available. Approximately 30% of patients may also have circulating antineutrophilic cytoplasmic antibodies (ANCAs), although these are not specific for Goodpasture’s syndrome and can be found in other conditions such as Wegener’s granulomatosis, which also cause renal impairment and pulmonary hemorrhage.

Diagnosis is typically confirmed through a renal biopsy, which can detect the presence of anti-GBM antibodies. This would be the most appropriate investigation to confirm the diagnosis in this case.

The management of Goodpasture’s syndrome involves a combination of plasmapheresis to remove circulating antibodies and the use of corticosteroids or cyclophosphamide.

Delirium is an acute syndrome that causes disturbances in consciousness, attention, cognition, and perception. It is also known as an acute confusional state. The DSM-IV criteria for diagnosing delirium include recent onset of fluctuating awareness, impairment of memory and attention, and disorganized thinking. Delirium typically develops over hours to days and may be accompanied by behavioral changes, personality changes, and psychotic features. It often occurs in individuals with predisposing factors, such as advanced age or multiple comorbidities, when exposed to new precipitating factors, such as medications or infection. Symptoms of delirium fluctuate throughout the day, with lucid intervals occurring during the day and worse disturbances at night. Falling and loss of appetite are often warning signs of delirium.

Delirium can be classified into three subtypes based on the person’s symptoms. Hyperactive delirium is characterized by inappropriate behavior, hallucinations, and agitation. Restlessness and wandering are common in this subtype. Hypoactive delirium is characterized by lethargy, reduced concentration, and appetite. The person may appear quiet or withdrawn. Mixed delirium presents with signs and symptoms of both hyperactive and hypoactive subtypes.

The exact pathophysiology of delirium is not fully understood, but it is believed to involve multiple mechanisms, including cholinergic deficiency, dopaminergic excess, and inflammation. The cause of delirium is usually multifactorial, with predisposing factors and precipitating factors playing a role. Predisposing factors include older age, cognitive impairment, frailty, significant injuries, and iatrogenic events. Precipitating factors include infection, metabolic or electrolyte disturbances, cardiovascular disorders, respiratory disorders, neurological disorders, endocrine disorders, urological disorders, gastrointestinal disorders, severe uncontrolled pain, alcohol intoxication or withdrawal, medication use, and psychosocial factors.

Delirium is highly prevalent in hospital settings, affecting up to 50% of patients aged over 65 and occurring in 30% of people aged over 65 presenting to the emergency department. Complications of delirium include increased risk of death, high in-hospital mortality rates, higher mortality rates following hospital discharge, increased length of stay in hospital, nosocomial infections, increased risk of admission to long-term care or re-admission to hospital, increased incidence of dementia, increased risk of falls and associated injuries, pressure sores.

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

In cases where there are no reasons to avoid them, high-dose NSAIDs are the first choice for treating acute gout. A commonly used and effective regimen is to take Naproxen 750 mg as a single dose, followed by 250 mg three times a day. Aspirin should not be used for gout because it reduces the clearance of urate in the urine and interferes with the action of uricosuric agents. Instead, Naproxen, diclofenac, or indomethacin are more suitable options.

Allopurinol is used as a preventive measure to reduce future gout attacks by lowering the levels of uric acid in the blood. However, it should not be started during an acute gout episode as it can worsen the severity and duration of symptoms. Colchicine works by affecting neutrophils, binding to tubulin to prevent their migration into the affected joint. It is equally effective as NSAIDs in relieving acute gout attacks and can also be used for prophylactic treatment if a patient cannot tolerate allopurinol.

NSAIDs should not be used in patients with heart failure as they can lead to fluid retention and congestive cardiac failure. In such cases, colchicine is the preferred treatment option. Colchicine is also recommended for patients who cannot tolerate NSAIDs. Febuxostat (Uloric) is an alternative to allopurinol and is used for managing chronic gout.

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.

Generalized anxiety disorder (GAD) is the most probable diagnosis in this case.

The primary distinction between GAD and panic disorder lies in their symptoms. GAD is primarily characterized by anxiety, whereas panic disorder is characterized by panic attacks. Individuals with GAD typically do not experience frequent panic attacks, although they may occasionally occur. In this patient’s case, while he did experience occasional panic attacks, they were not his main symptom, and his anxiety was not centered around these episodes.

GAD is associated with persistent physical symptoms such as muscle tension, aches, headaches, fatigue, trembling, twitching, irritability, difficulty swallowing, and the sensation of a lump in the throat.

On the other hand, panic disorder primarily revolves around the panic attacks themselves. A panic attack is a brief and intense episode characterized by overwhelming feelings of dread and fear, which may or may not be triggered by a specific situation. Common physical symptoms experienced during panic attacks include dizziness, sweating, chills, nausea, trembling, shaking, abdominal cramps, throat tightness, shortness of breath, numbness in the extremities, rapid heartbeat, palpitations, and chest pain.

The NICE guidelines for suspected deep vein thrombosis (DVT) suggest considering the possibility of DVT if typical symptoms and signs are present, particularly if the person has risk factors like previous venous thromboembolism and immobility.

Typical signs and symptoms of DVT include unilateral localized pain (often throbbing) that occurs during walking or bearing weight, as well as calf swelling (or, less commonly, swelling of the entire leg). Other signs to look out for are tenderness, skin changes such as edema, redness, and warmth, and vein distension.

To rule out other potential causes for the symptoms and signs, it is important to conduct a physical examination and review the person’s general medical history.

When assessing leg and thigh swelling, it is recommended to measure the circumference of the leg 10 cm below the tibial tuberosity and compare it with the unaffected leg. A difference of more than 3 cm between the two legs increases the likelihood of DVT.

Additionally, it is important to check for edema and dilated collateral superficial veins on the affected side.

To assess the likelihood of DVT and guide further management, the two-level DVT Wells score can be used.

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

The first-line treatment for C.diff infection is typically oral vancomycin. When managing moderate cases, it is important to stop the antibiotics that caused the infection, ensure proper hydration, and provide guidance on hygiene measures. The recommended treatment is to prescribe oral vancomycin 125 mg four times a day for 10 days. Alternatively, fidaxomicin 200 mg twice a day for 10 days can be used as a second-line treatment. In severe cases, oral vancomycin may be combined with intravenous metronidazole, but it is advisable to consult with a local microbiologist or infectious disease specialist before proceeding.

Further Reading:

Clostridium difficile (C.diff) is a gram positive rod commonly found in hospitals. Some strains of C.diff produce exotoxins that can cause intestinal damage, leading to pseudomembranous colitis. This infection can range from mild diarrhea to severe illness. Antibiotic-associated diarrhea is often caused by C.diff, with 20-30% of cases being attributed to this bacteria. Antibiotics such as clindamycin, cephalosporins, fluoroquinolones, and broad-spectrum penicillins are frequently associated with C.diff infection.

Clinical features of C.diff infection include diarrhea, distinctive smell, abdominal pain, raised white blood cell count, and in severe cases, toxic megacolon. In some severe cases, diarrhea may be absent due to the infection causing paralytic ileus. Diagnosis is made by detecting Clostridium difficile toxin (CDT) in the stool. There are two types of exotoxins produced by C.diff, toxin A and toxin B, which cause mucosal damage and the formation of a pseudomembrane in the colon.

Risk factors for developing C.diff infection include age over 65, antibiotic treatment, previous C.diff infection, exposure to infected individuals, proton pump inhibitor or H2 receptor antagonist use, prolonged hospitalization or residence in a nursing home, and chronic disease or immunosuppression. Complications of C.diff infection can include toxic megacolon, colon perforation, sepsis, and even death, especially in frail elderly individuals.

Management of C.diff infection involves stopping the causative antibiotic if possible, optimizing hydration with IV fluids if necessary, and assessing the severity of the infection. Treatment options vary based on severity, ranging from no antibiotics for mild cases to vancomycin or fidaxomicin for moderate cases, and hospital protocol antibiotics (such as oral vancomycin with IV metronidazole) for severe or life-threatening cases. Severe cases may require admission under gastroenterology or GI surgeons.

Entonox®, also known as ‘gas and air’ or ‘laughing gas’, is a combination of nitrous oxide and oxygen in equal proportions. It offers a mild sedative effect and helps reduce anxiety.

Further Reading:

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

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

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

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

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

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

Haemolytic disease of the newborn is a condition that occurs in the fetus when IgG antibodies from the mother pass through the placenta. This is classified as a type II hypersensitivity reaction, also known as cytotoxic hypersensitivity. In this type of reaction, antibodies produced by the immune response attach to antigens on the patient’s own cell surfaces.

The rhesus gene is composed of three parts, which can be C or c, D or d, and E or e. Approximately 15% of the population consists of rhesus negative women who are homozygous for d. When rhesus-positive fetal cells enter the bloodstream of a rhesus-negative mother, maternal anti-D IgG antibodies may be produced. This commonly occurs during delivery, but can also happen after fetal-maternal hemorrhage and certain medical procedures.

Some other examples of type II hypersensitivity reactions include autoimmune hemolytic anemia, ANCA-associated vasculitides, Goodpasture’s syndrome, myasthenia gravis, and rhesus incompatibility.

Inspired oxygen primarily works by removing nitrogen from the lungs, which would otherwise take up a significant portion of the lung capacity. This nitrogen is replaced with oxygen, leading to improved oxygenation of the tissues and an increased oxygen reserve. As a result, the patient can safely hold their breath for a longer period of time. It is recommended to preoxygenate the patient for at least 3 minutes.

Further Reading:

Rapid sequence induction (RSI) is a method used to place an endotracheal tube (ETT) in the trachea while minimizing the risk of aspiration. It involves inducing loss of consciousness while applying cricoid pressure, followed by intubation without face mask ventilation. The steps of RSI can be remembered using the 7 P’s: preparation, pre-oxygenation, pre-treatment, paralysis and induction, protection and positioning, placement with proof, and post-intubation management.

Preparation involves preparing the patient, equipment, team, and anticipating any difficulties that may arise during the procedure. Pre-oxygenation is important to ensure the patient has an adequate oxygen reserve and prolongs the time before desaturation. This is typically done by breathing 100% oxygen for 3 minutes. Pre-treatment involves administering drugs to counter expected side effects of the procedure and anesthesia agents used.

Paralysis and induction involve administering a rapid-acting induction agent followed by a neuromuscular blocking agent. Commonly used induction agents include propofol, ketamine, thiopentone, and etomidate. The neuromuscular blocking agents can be depolarizing (such as suxamethonium) or non-depolarizing (such as rocuronium). Depolarizing agents bind to acetylcholine receptors and generate an action potential, while non-depolarizing agents act as competitive antagonists.

Protection and positioning involve applying cricoid pressure to prevent regurgitation of gastric contents and positioning the patient’s neck appropriately. Tube placement is confirmed by visualizing the tube passing between the vocal cords, auscultation of the chest and stomach, end-tidal CO2 measurement, and visualizing misting of the tube. Post-intubation management includes standard care such as monitoring ECG, SpO2, NIBP, capnography, and maintaining sedation and neuromuscular blockade.

Overall, RSI is a technique used to quickly and safely secure the airway in patients who may be at risk of aspiration. It involves a series of steps to ensure proper preparation, oxygenation, drug administration, and tube placement. Monitoring and post-intubation care are also important aspects of RSI.

Hyperosmolar hyperglycaemic state (HHS) is a condition characterized by extremely high blood sugar levels, dehydration, and increased osmolality without significant ketosis. In this patient, the symptoms are consistent with HHS as they have high blood sugar levels without significant ketoacidosis (pH is above 7.3 and ketones are less than 3 mmol/L). Additionally, they show signs of dehydration with low blood pressure and a fast heart rate. The osmolality is calculated to be equal to or greater than 320 mosmol/kg, indicating increased concentration of solutes in the blood.

Further Reading:

Hyperosmolar hyperglycaemic state (HHS) is a syndrome that occurs in people with type 2 diabetes and is characterized by extremely high blood glucose levels, dehydration, and hyperosmolarity without significant ketosis. It can develop over days or weeks and has a mortality rate of 5-20%, which is higher than that of diabetic ketoacidosis (DKA). HHS is often precipitated by factors such as infection, inadequate diabetic treatment, physiological stress, or certain medications.

Clinical features of HHS include polyuria, polydipsia, nausea, signs of dehydration (hypotension, tachycardia, poor skin turgor), lethargy, confusion, and weakness. Initial investigations for HHS include measuring capillary blood glucose, venous blood gas, urinalysis, and an ECG to assess for any potential complications such as myocardial infarction. Osmolality should also be calculated to monitor the severity of the condition.

The management of HHS aims to correct dehydration, hyperglycaemia, hyperosmolarity, and electrolyte disturbances, as well as identify and treat any underlying causes. Intravenous 0.9% sodium chloride solution is the principal fluid used to restore circulating volume and reverse dehydration. If the osmolality does not decline despite adequate fluid balance, a switch to 0.45% sodium chloride solution may be considered. Care must be taken in correcting plasma sodium and osmolality to avoid complications such as cerebral edema and osmotic demyelination syndrome.

The rate of fall of plasma sodium should not exceed 10 mmol/L in 24 hours, and the fall in blood glucose should be no more than 5 mmol/L per hour. Low-dose intravenous insulin may be initiated if the blood glucose is not falling with fluids alone or if there is significant ketonaemia. Potassium replacement should be guided by the potassium level, and the patient should be encouraged to drink as soon as it is safe to do so.

Complications of treatment, such as fluid overload, cerebral edema, or central pontine myelinolysis, should be assessed for, and underlying precipitating factors should be identified and treated. Prophylactic anticoagulation is required in most patients, and all patients should be assumed to be at high risk of foot ulceration, necessitating appropriate foot protection and daily foot checks.