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Question 1
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A 42-year-old woman presents with a 2-day history of right-sided neck pain and left-sided sensorimotor disturbance. Shortly after the neck pain had begun, she had noted that her right eyelid was ‘drooping’ and that she had developed weakness and altered sensation in her left arm and leg. She had recently visited a physiotherapist for neck pain after a fall. Examination reveals right Horner syndrome, and weakness and sensory disturbance on the left-hand side, with a left extensor plantar response.
Which of the following is the most likely clinical diagnosis?Your Answer: Carotid artery dissection
Explanation:Differential Diagnosis for a Young Patient with Neck Pain and Stroke Syndrome
Carotid artery dissection, lateral medullary infarction, posterior fossa space-occupying lesion, subarachnoid hemorrhage, and venous sinus thrombosis are all potential causes of neck pain and stroke syndrome in a young patient. Carotid artery dissection is a tear in one of the carotid arteries that can occur spontaneously or following trauma. Symptoms may include vague headache, facial and neck pain, meiosis, ptosis, focal limb weakness, and cranial nerve palsies. Lateral medullary infarction is usually due to occlusion of the intracranial vertebral artery or the posterior inferior cerebellar artery and may present with vestibulocerebellar symptoms, ipsilateral Horner syndrome, sensory symptoms, and ipsilateral bulbar muscle weakness. Posterior fossa space-occupying lesions are more common in children and may cause symptoms due to raised intracranial pressure and brainstem/cerebellum compression. Subarachnoid hemorrhage presents with a sudden-onset, severe headache, while venous sinus thrombosis usually presents with progressive headache, nausea, vomiting, and seizures. Hemiplegia may occur in both posterior fossa space-occupying lesions and venous sinus thrombosis, but Horner syndrome does not occur in either. A thorough evaluation is necessary to determine the underlying cause of neck pain and stroke syndrome in a young patient.
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This question is part of the following fields:
- Neurology
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Question 2
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Which one of the following is not a recognized feature of anorexia nervosa in adolescents?
Your Answer: Reduced growth hormone levels
Explanation:Anorexia is characterized by low levels of various substances, including growth hormone, glucose, salivary glands, cortisol, cholesterol, and carotene.
Characteristics of Anorexia Nervosa
Anorexia nervosa is a disorder that is characterized by a number of clinical signs and physiological abnormalities. The most notable feature of this disorder is a reduced body mass index, which is often accompanied by bradycardia and hypotension. In addition, individuals with anorexia nervosa may experience enlarged salivary glands, which can cause discomfort and difficulty swallowing.
Physiological abnormalities associated with anorexia nervosa include hypokalaemia, which is a deficiency of potassium in the blood, as well as low levels of FSH, LH, oestrogens, and testosterone. Individuals with anorexia nervosa may also have raised levels of cortisol and growth hormone, impaired glucose tolerance, hypercholesterolaemia, hypercarotinaemia, and low T3.
Overall, anorexia nervosa is a complex disorder that can have a significant impact on an individual’s physical and emotional well-being. It is important for individuals who are struggling with this disorder to seek professional help in order to receive the support and treatment they need to recover.
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This question is part of the following fields:
- Psychiatry
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Question 3
Incorrect
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A 19-year-old man is being examined for excessive bleeding after a tooth extraction. The test results show:
Platelet count: 173 * 109/l
Prothrombin time (PT): 12.9 seconds
Activated partial thromboplastin time (APTT): 84 seconds
Which clotting factor is he most likely deficient in?Your Answer: Factor VII
Correct Answer: Factor VIII
Explanation:Understanding Haemophilia
Haemophilia is a genetic disorder that affects blood coagulation. It is caused by a deficiency in either factor VIII (Haemophilia A) or factor IX (Haemophilia B), which are essential for blood clotting. Although it is an X-linked recessive disorder, up to 30% of patients have no family history of the condition.
The symptoms of haemophilia include haemoarthroses, haematomas, and prolonged bleeding after surgery or trauma. Blood tests can confirm the diagnosis, with a prolonged APTT being a common finding. However, the bleeding time, thrombin time, and prothrombin time are usually normal.
Treatment for haemophilia involves replacing the missing clotting factor through regular infusions. However, up to 10-15% of patients with haemophilia A may develop antibodies to factor VIII treatment, which can make it less effective.
In summary, haemophilia is a genetic disorder that affects blood coagulation and can cause symptoms such as haemoarthroses and prolonged bleeding. Diagnosis is confirmed through blood tests, and treatment involves replacing the missing clotting factor.
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This question is part of the following fields:
- Haematology/Oncology
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Question 4
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A 65-year-old man with chronic kidney failure has been instructed by his nephrologist to adhere to a 'renal diet'. He visits you to gain further knowledge about this. What is typically recommended to individuals with chronic kidney disease?
Your Answer: Low potassium diet
Explanation:Dietary Recommendations for Chronic Kidney Disease Patients
Chronic kidney disease patients are recommended to follow a specific diet to reduce the strain on their kidneys. This diet includes low levels of protein, phosphate, sodium, and potassium. The reason for this is that these substances are typically excreted by the kidneys, and reducing their intake can help ease the burden on the kidneys. By following this diet, patients can help slow the progression of their kidney disease and improve their overall health. It is important for patients to work with a healthcare professional or registered dietitian to ensure they are meeting their nutritional needs while following these dietary restrictions.
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This question is part of the following fields:
- Renal Medicine/Urology
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Question 5
Correct
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Which of the following statements about the correlation between the menstrual cycle and body temperature is accurate?
Your Answer: Body temperature rises following ovulation
Explanation:The increase in body temperature after ovulation is utilized in certain cases of natural family planning.
Phases of the Menstrual Cycle
The menstrual cycle is a complex process that can be divided into four phases: menstruation, follicular phase, ovulation, and luteal phase. During the follicular phase, a number of follicles develop in the ovaries, with one follicle becoming dominant around the mid-follicular phase. At the same time, the endometrium begins to proliferate. This phase is characterized by a rise in follicle-stimulating hormone (FSH), which results in the development of follicles that secrete oestradiol.
During ovulation, the mature egg is released from the dominant follicle and triggers the acute release of luteinizing hormone (LH). This phase occurs on day 14 of the menstrual cycle. Following ovulation, the luteal phase begins, during which the corpus luteum secretes progesterone. This hormone causes the endometrium to change into a secretory lining. If fertilization does not occur, the corpus luteum will degenerate, and progesterone levels will fall.
The cervical mucus also changes throughout the menstrual cycle. Following menstruation, the mucus is thick and forms a plug across the external os. Just prior to ovulation, the mucus becomes clear, acellular, and low viscosity. It also becomes ‘stretchy’ – a quality termed spinnbarkeit. Under the influence of progesterone, it becomes thick, scant, and tacky.
Basal body temperature is another indicator of the menstrual cycle. It falls prior to ovulation due to the influence of oestradiol and rises following ovulation in response to higher progesterone levels. Understanding the different phases of the menstrual cycle can help individuals track their fertility and plan for pregnancy.
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This question is part of the following fields:
- Reproductive Medicine
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Question 6
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A 68-year-old complains of tingling and numbness in his left little and ring finger. He states that the pain used to be intermittent but is now persistent. The pain intensifies when he puts pressure on his elbow, and he remembers fracturing his elbow as a child. Based on the provided medical history, what is the probable cause of his symptoms?
Your Answer: Cubital tunnel syndrome
Explanation:Cubital tunnel syndrome results from the ulnar nerve being compressed, leading to tingling and numbness in the 4th and 5th fingers. This condition is often aggravated by leaning on the affected elbow and may be associated with osteoarthritis or prior injury. Medial epicondylitis causes pain in the medial elbow, not distal hand symptoms. Radial tunnel syndrome causes aching and paraesthesia in the hand and forearm distal to the lateral epicondyle. Carpal tunnel syndrome, on the other hand, is caused by compression of the median nerve and presents with pain and tingling in the thumb, index, middle, and medial half of the ring finger. De Quervain’s tenosynovitis typically affects the base of the thumb.
Understanding Cubital Tunnel Syndrome
Cubital tunnel syndrome is a condition that occurs when the ulnar nerve is compressed as it passes through the cubital tunnel. This can cause a range of symptoms, including tingling and numbness in the fourth and fifth fingers, which may start off intermittent but eventually become constant. Over time, patients may also experience weakness and muscle wasting. Pain is often worse when leaning on the affected elbow, and there may be a history of osteoarthritis or prior trauma to the area.
Diagnosis of cubital tunnel syndrome is usually made based on clinical features, although nerve conduction studies may be used in selected cases. Management of the condition typically involves avoiding aggravating activities, undergoing physiotherapy, and receiving steroid injections. In cases where these measures are not effective, surgery may be necessary. By understanding the symptoms and treatment options for cubital tunnel syndrome, patients can take steps to manage their condition and improve their quality of life.
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This question is part of the following fields:
- Musculoskeletal
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Question 7
Incorrect
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A 7-year-old boy is presented for surgery due to recurring headaches. What is the primary reason for headaches in children?
Your Answer: Tension-type headache
Correct Answer: Migraine
Explanation:In children, primary headache is most commonly caused by migraine.
Understanding Headaches in Children
Headaches are a common occurrence in children, with up to 50% of 7-year-olds and 80% of 15-year-olds experiencing at least one headache. Migraine without aura is the most common cause of primary headache in children, with a strong female preponderance after puberty. The International Headache Society has produced criteria for diagnosing pediatric migraine without aura, which includes headache attacks lasting 4-72 hours, with at least two of four specific features and accompanying symptoms such as nausea and vomiting.
When it comes to acute management, ibuprofen is considered more effective than paracetamol for pediatric migraine. Triptans may be used in children over 12 years old, but follow-up is required, and only sumatriptan nasal spray is licensed for use in young people. However, oral triptans are not currently licensed for those under 18 years old, and side effects may include tingling, heat, and pressure sensations.
Prophylaxis for pediatric migraine is limited, with no clear consensus guidelines. Pizotifen and propranolol are recommended as first-line preventatives, while valproate, topiramate, and amitriptyline are considered second-line preventatives. Tension-type headache is the second most common cause of headache in children, with diagnostic criteria including at least 10 previous headache episodes lasting from 30 minutes to 7 days, with specific pain characteristics and the absence of nausea or vomiting.
In summary, headaches in children are common, and migraine without aura is the most common primary headache. Acute management includes ibuprofen and triptans, while prophylaxis is limited. Tension-type headache is also a common cause of headache in children. It is important to seek medical advice if headaches are frequent or severe, or if there are any concerning symptoms such as neurological deficits or changes in behavior.
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This question is part of the following fields:
- Paediatrics
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Question 8
Correct
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A 42-year-old female complains of a burning sensation on the anterolateral aspect of her right thigh. The doctor suspects meralgia paraesthetica. Which nerve is the most probable cause of this condition?
Your Answer: Lateral cutaneous nerve of thigh
Explanation:A possible cause of burning pain in the thigh is compression of the lateral cutaneous nerve, which can lead to a condition called meralgia paraesthetica. Meralgia paraesthetica, a condition characterized by burning pain in the thigh, may result from compression of the lateral cutaneous nerve of the thigh.
Understanding Meralgia Paraesthetica
Meralgia paraesthetica is a condition characterized by paraesthesia or anaesthesia in the distribution of the lateral femoral cutaneous nerve (LFCN). It is caused by entrapment of the LFCN, which can be due to various factors such as trauma, iatrogenic causes, or neuroma. Although not rare, it is often underdiagnosed.
The LFCN is a sensory nerve that originates from the L2/3 segments and runs beneath the iliac fascia before exiting through the lateral aspect of the inguinal ligament. Compression of the nerve can occur anywhere along its course, but it is most commonly affected as it curves around the anterior superior iliac spine. Meralgia paraesthetica is more common in men than women and is often seen in those aged between 30 and 40.
Patients with meralgia paraesthetica typically experience burning, tingling, coldness, or shooting pain, as well as numbness and deep muscle ache in the upper lateral aspect of the thigh. Symptoms are usually aggravated by standing and relieved by sitting. The condition can be mild and resolve spontaneously or severely restrict the patient for many years.
Diagnosis of meralgia paraesthetica can be made based on the pelvic compression test, which is highly sensitive. Injection of the nerve with local anaesthetic can also confirm the diagnosis and provide relief. Ultrasound is effective both for diagnosis and guiding injection therapy. Nerve conduction studies may also be useful. Overall, understanding meralgia paraesthetica is important for prompt diagnosis and management of this condition.
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This question is part of the following fields:
- Musculoskeletal
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Question 9
Correct
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A 25-year-old man with known type I diabetes mellitus presents to the Emergency Department with abdominal pain and vomiting.
On examination, he appears dehydrated. He is started on an insulin infusion. His blood tests are shown below:
Investigation Result Normal value
pH (venous) 7.23 7.35–7.45
Partial pressure of carbon dioxide (pCO2) 2.1 kPa 4.5–6.0 kPa
Partial pressure of oxygen (pO2) 11.2 kPa 10–14 kPa
Sodium (Na+) 135 mmol/l 135–145 mmol/l
Potassium (K+) 3.1 mmol/l 3.5–5.0 mmol/l
Bicarbonate 13 mmol/l 22–28 mmol/l
Glucose 22.4 mmol/l < 11.1 mmol/l
Ketones 3.6 mmol/l < 0.6 mmol/l
What should happen to his regular insulin while he is treated?
Select the SINGLE best treatment from the list below.
Your Answer: Continue long-acting insulin and stop short-acting insulin
Explanation:Treatment of Diabetic Ketoacidosis: Continuing Long-Acting Insulin and Stopping Short-Acting Insulin
When a patient presents with diabetic ketoacidosis (DKA), it is important to provide prompt treatment. This involves fluid replacement with isotonic saline and an intravenous insulin infusion at 0.1 unit/kg per hour. While this takes place, the patient’s normal long-acting insulin should be continued, but their short-acting insulin should be stopped to avoid hypoglycemia.
In addition to insulin and fluid replacement, correction of electrolyte disturbance is essential. Serum potassium levels may be high on admission, but often fall quickly following treatment with insulin, resulting in hypokalemia. Potassium may need to be added to the replacement fluids, guided by the potassium levels. If the rate of potassium infusion is greater than 20 mmol/hour, cardiac monitoring is required.
Overall, the key to successful treatment of DKA is a careful balance of insulin, fluids, and electrolyte replacement. By continuing long-acting insulin and stopping short-acting insulin, healthcare providers can help ensure the best possible outcome for their patients.
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This question is part of the following fields:
- Endocrinology/Metabolic Disease
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Question 10
Incorrect
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A 35-year-old woman comes to the clinic worried about a lump in her right breast that she discovered a few days ago. Upon examination, the lump is painless, smooth, soft, and easily movable. There is no history of breast cancer in her family. What is the most probable diagnosis?
Your Answer:
Correct Answer: Fibroadenoma
Explanation:Breast masses are a common concern among women, and it is important to understand the possible causes to determine the appropriate course of action. Here are some of the most common causes of breast masses and their characteristics:
Fibroadenoma: This is the most common cause of breast mass in women under 35 years old. It appears as a singular, firm, rubbery, smooth, mobile, painless mass ranging in size from 1 cm to 5 cm. Ultrasonography reveals a well-defined, hypoechoic, homogeneous mass 1–20 cm in diameter.
Fat Necrosis: This is a benign inflammatory process that occurs when there is saponification of local fat. It can result from direct trauma or nodular panniculitis. The breast mass is usually firm, round, and painless, and there may be a single mass or multiple masses. It may be tender or painful in some people.
Breast Abscess: This usually presents with localised breast oedema, erythema, warmth, and pain. There may be associated symptoms of fever, nausea, vomiting, spontaneous drainage from the mass or nipple, and a history of previous breast infection.
Breast Cancer: Early breast cancer may be asymptomatic, and pain and discomfort are typically not present. It is often first detected as an abnormality on a mammogram before it is felt by the patient or healthcare professional. If a lump is discovered, there may be a change in breast size or shape, skin dimpling or skin changes, recent nipple inversion or skin change, or nipple abnormalities.
Lipoma: Lipomas are common benign tumors composed of mature adipocytes that typically present clinically as well-circumscribed, soft, mobile, nontender masses. The classic mammographic appearance of lipoma is a circumscribed fat-containing mass.
It is important to note that the physical examination findings may not always be enough to determine the cause of the breast mass, and further testing may be necessary. Consultation with a healthcare professional is recommended for proper diagnosis and treatment.
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This question is part of the following fields:
- Reproductive Medicine
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