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Question 1
Correct
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Which portion of the renal tubule absorbs amino acids and glucose?
Your Answer: Proximal convoluted tubule
Explanation:In relation to the morphology of the kidney as a whole, the convoluted segments of the proximal tubules are confined entirely to the renal cortex. Glucose, amino acids, inorganic phosphate and some other solutes are reabsorbed via secondary active transport in the proximal renal tubule through co-transport channels driven by the sodium gradient.
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This question is part of the following fields:
- Basic Sciences
- Physiology
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Question 2
Incorrect
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A 56-year-old female undergoes a low anterior resection for rectal cancer. The procedure is performed as open surgery, what is the most appropriate method for closure of the abdominal wall?
Your Answer: Mass closure of the abdomen obeying Jenkins rule using 1/0 nylon
Correct Answer: Mass closure of the abdomen obeying Jenkins rule using 1 PDS
Explanation:A midline incision is the most commonly used route of access to the abdominal cavity.
Peritoneal closure
A number of randomized, controlled trials have shown no benefit to peritoneal closure; thus, refraining from closing the peritoneum is a commonly accepted practice. Some surgeons believe that closure of the peritoneum reduces adhesions between the abdominal contents and the suture line; however, at this time, there is only limited scientific evidence for this belief.
Fascial closure
The technique of fascial closure is highly variable among surgeons; however, the various approaches may be grouped into two primary methods as follows:
Layered closure
Mass closure
Layered closure is the sequential closure of each fascial layer individually. The primary advantage of this method is that multiple suture strands exist so that if a suture breaks, the incision is held intact by the remaining sutures.
Mass closure is continuous fascial closure with a single suture. This method allows even distribution of tension across the entire length of the suture, resulting in minimization of tissue strangulation. The goal is an approximation of tissue edges to allow scar formation. Excessive tension leads to tissue necrosis and eventual failure of the closure.
The theoretical disadvantage of mass closure is that a single suture is responsible for maintaining the integrity of the closure. The benefits of mass closure include decreased cost and decreased operating time. There is no evidence that mass closure is associated with an increased incidence of hernia formation or wound dehiscence.
When rectus muscle is incorporated, using absorbable suture and a loose closure in order to decrease postoperative pain and tissue necrosis is important. The assistant following the continuous closure should apply sufficient tension to approximate the tissue without strangulating it. The suture is run in 1-cm intervals (maximally), with at least a 1-cm bite of fascia in each throw.
The two primary methods of skin closure are with suture or staples. Suture closure is generally performed with 3-0 or 4-0 absorbable suture in a running subcuticular fashion or with nylon running or interrupted transdermal suture. Staple closure is a viable alternative to suturing the skin. In a study comparing scar cosmesis at 6 months, no difference in appearance existed in patients with suture versus staple skin closure
What is Jenkins Rule?
It is a rule for closure of the abdominal wound. It states that for a continuous suture, the length of suture used should be at least four times the length of the wound with sutures 1cm apart and with 1cm bites of the wound edge -
This question is part of the following fields:
- Principles Of Surgery-in-General
- Surgical Technique And Technology
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Question 3
Correct
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If a 70-year-old man with known atrial fibrillation dies suddenly, which of these is the most likely cause of death?
Your Answer: Thromboembolism
Explanation:In atrial fibrillation, the abnormal atrial contraction can cause blood to stagnate in the left atrium and form a thrombus, which may then embolize. The patient’s history of AF suggest an embolic disease, which lead to his death.
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This question is part of the following fields:
- Basic Sciences
- Pathology
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Question 4
Correct
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The basilar artery arises from the confluence of which two arteries?
Your Answer: Vertebral
Explanation:The basilar artery is part of the vertebrobasilar system. It is formed by the confluence of the two vertebral arteries which arise from the subclavian arteries. These two vertebral arteries merge at the level of cranial nerve VI at the junction between the pons and the medulla oblangata to form what is know as the basilar artery. This vertebrobasilar system supplies the upper spinal cord, brainstem, cerebellum, and posterior part of brain.
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This question is part of the following fields:
- Anatomy
- Basic Sciences
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Question 5
Correct
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A patient gives a history of dull discomfort in her abdomen associated with pain that she points to be on her right shoulder and right scapula. The following organs are most likely to be source of her pain:
Your Answer: Liver, duodenum and gallbladder
Explanation:Referred pain is felt at a point away from the source of the pain or the unpleasant sensation. It arises when a nerve is damaged or compressed at a point but the pain is felt at another site that is the territory of that nerve. Common abdominal causes of referred pain to the shoulder and the shoulder blade are the liver, duodenum and gall bladder.
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This question is part of the following fields:
- Anatomy
- Basic Sciences
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Question 6
Incorrect
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A 70-year-old man suffers an ischaemic stroke and develops a left homonymous hemianopia. Where is the likely infarct?
Your Answer: Left occipital lobe
Correct Answer: Right occipital lobe
Explanation:The man has a left homonymous hemianopia which means he is unable to view objects in the left visual field. This information is processed by the right primary visual cortex which lies in the right occipital lobe.
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This question is part of the following fields:
- Basic Sciences
- Pathology
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Question 7
Incorrect
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A 4-year-old boy is brought to the clinic with symptoms of urinary hesitancy and poor stream. Which of the following is the most likely underlying diagnosis?
Your Answer: Neurogenic bladder
Correct Answer: Posterior urethral valves
Explanation:In children, more common causes of Urinary tract obstruction include the following:
UPJ or UVJ obstruction
Ectopic ureter
Ureterocoele
Megaureter
Posterior urethral valvesPosterior urethral valves:
During the early stages of embryogenesis, the most caudal end of the wolffian duct is absorbed into the primitive cloaca at the site of the future verumontanum in the posterior urethra. In healthy males, the remnants of this process are the posterior urethral folds, called plicae colliculi. Histologic studies suggest that PUVs are formed at approximately 4 weeks’ gestation, as the wolffian duct fuses with the developing cloaca.
Congenital obstructing posterior urethral membrane (COPUM) was first proposed by Dewan and Goh and was later supported by histologic studies by Baskin. This concept proposes that instead of a true valve, a persistent oblique membrane is ruptured by initial catheter placement and, secondary to rupture, forms a valve like configuration.
Indicators of possible PUVs later in childhood include the following:
Urinary tract infection (UTI)
Diurnal enuresis in boys older than 5 years
Secondary diurnal enuresis
Voiding pain or dysfunction
Abnormal urinary stream -
This question is part of the following fields:
- Generic Surgical Topics
- Paediatric Surgery
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Question 8
Correct
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What is the most likely cause of bitemporal hemianopia?
Your Answer: Prolactinoma
Explanation:Prolactinoma is the mot common pituitary adenoma; leading to hyperprolactinaemia. By virtue of their size, macroprolactinomas press on the adjacent structures leading to headaches and loss of vision due to the pressure effect on optic chiasm. Women notice a change in their menstrual cycle due to raised prolactin levels. In comparison, the problem goes unnoticed in men in the initial stages. Craniopharyngioma is a less common space-occupying lesions affecting children and young adults.
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This question is part of the following fields:
- Basic Sciences
- Pathology
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Question 9
Correct
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The pterygoid plexus receives tributaries from which of the following veins?
Your Answer: Maxillary vein
Explanation:The pterygoid plexus of veins is the main venous component associated with the infratemporal fossa. It receives tributaries corresponding to the branches of the internal maxillary artery. This plexus communicates freely with the anterior facial vein; it also communicates with the cavernous sinus, by branches through the foramen of Vesalius, foramen ovale and foramen lacerum. The (internal) maxillary vein is a short trunk which accompanies the first part of the (internal) maxillary artery. It is formed by a confluence of the veins of the pterygoid plexus and passes backward between the sphenomandibular ligament and the neck of the mandible and unites with the temporal vein to form the posterior facial vein. It carries blood away from the infratemporal fossa.
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This question is part of the following fields:
- Anatomy
- Basic Sciences
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Question 10
Incorrect
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Which of the following nerves has its terminal branch at the supratrochlear nerve?
Your Answer: Ophthalmic
Correct Answer: Frontal
Explanation:The supratrochlear nerve is a branch of the frontal nerve which comes from the ophthalmic division of cranial nerve V (trigeminal nerve). It passes above the superior oblique nerve and its descending filaments join the infratrochlear branch of the nasociliary nerve. From the orbit, it exits between the supraorbital foramen and the pulley of the superior oblique. It then curves up to the forehead beneath the corrugator supercilli and frontalis muscle. It further divides into branches that supply sensory innervation to the bridge of the nose, medial part of the upper eyelid and medial forehead.
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This question is part of the following fields:
- Anatomy
- Basic Sciences
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Question 11
Incorrect
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A 73-year-old woman goes to the doctor complaining of pain and stiffness in her shoulders and hips for 4 months, which is worst in the mornings. She has also been suffering from fatigue, weight loss and depression. There were no abnormal findings on physical examination. The erythrocyte sedimentation rate was 110 mm/hour, and serum rheumatoid factor and antinuclear antibody assays were negative. Mild normochromic normocytic anaemia was also found. What is the most likely diagnosis in this case?
Your Answer: Polymyositis
Correct Answer: Polymyalgia rheumatica
Explanation:Polymyalgia rheumatica (PMR) affects older adults, with an acute or subacute onset. Symptoms include severe pain and stiffness of the neck and pectoral or pelvic girdles, which is worse in the morning or after a period of inactivity and is usually bilateral. Other symptoms can include fatigue, weight loss, depression and fever. The erythrocyte sedimentation rate is usually elevated, and normochromic normocytic anaemia can occur. Other tests are usually normal in this disease.
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This question is part of the following fields:
- Basic Sciences
- Pathology
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Question 12
Correct
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A 50-year old, obese gentleman with a compression fracture of T11 vertebra was admitted in the hospital. Examination revealed a raised blood pressure 165/112 mmHg and blood glucose 8.5 mmol/l. His abdomen had the presence of purplish striae. What condition is he likely to be suffering from?
Your Answer: Adrenal cortical carcinoma
Explanation:Adrenocortical carcinomas are rare tumours with reported incidence being only two in a million. However, they have a poor prognosis. These are large tumours and range from 4-10 cm in diameter. They arise from the adrenal cortex and 10% cases are bilateral. 50-80% are known to be functional, leading to Cushing syndrome. Even though the tumour affects both sexes equally, functional tumours are slightly commoner in women and non-functional tumours are commoner in men. As compared to women, men also develop this tumour at an older age and seem to have a poorer prognosis.
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This question is part of the following fields:
- Basic Sciences
- Pathology
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Question 13
Incorrect
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A 76 year old man who presented with lower back pain is diagnosed with prostatic carcinoma that has metastasized to his lumber spine. Which of the following markers is characteristically elevated?
Your Answer:
Correct Answer: PSA
Explanation:Spread of prostatic carcinoma is common to the lumbar spine and pelvis. This results in osteoblastic metastases that will present as lower back pain with increased alkaline phosphatase, prostatic acid phosphates and PSA. PSA is more specific and a PSA > 10 ng/ml for any age is worrisome.
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This question is part of the following fields:
- Basic Sciences
- Pathology
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Question 14
Incorrect
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A 25 year old woman is trapped for several hours after falling down a slope while hiking in the winter. She is airlifted to the nearest hospital where she was found to be hypothermic with a core temperature of 29oC. What is the most effective method of raising core temperature?
Your Answer:
Correct Answer: Instillation of warmed intra peritoneal fluid
Explanation:Answer: Instillation of warmed intra peritoneal fluid
Hypothermia describes a state in which the body’s mechanism for temperature regulation is overwhelmed in the face of a cold stressor. Hypothermia is classified as accidental or intentional, primary or secondary, and by the degree of hypothermia.
Active central rewarming is the fastest and most invasive method of rewarming. It involves use of warm IV fluids, gastric lavage and peritoneal dialysis by warm fluids. Peritoneal dialysis can be safely done with crystalloid dialysate at 40 to 42°C and it raises the body temperature by 4 to 6°C/hour. -
This question is part of the following fields:
- Emergency Medicine And Management Of Trauma
- Principles Of Surgery-in-General
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Question 15
Incorrect
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A cerebellar tremor can be differentiated from a Parkinsonian tremor in that:
Your Answer:
Correct Answer: It only occurs during voluntary movements
Explanation:Cerebellar disease leads to intention tremors, which is absent at rest and appears at the onset of voluntary movements. In comparison, Parkinson’s tremor is present at rest. Frequency of tremor is a less reliable means to differentiate between the two as the oscillation amplitude of the tremor is not constant throughout a voluntary action.
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This question is part of the following fields:
- Basic Sciences
- Physiology
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Question 16
Incorrect
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Choose the most correct answer regarding the obturator internus muscle.
Your Answer:
Correct Answer: It emerges from the pelvis through the lesser sciatic foramen
Explanation:The obturator internus arises from the inner surface of the anterolateral wall of the pelvis and the pelvic surface of the obturator membrane. The fibres converge rapidly towards the lesser sciatic foramen and end in four or five tendinous bands and leave the pelvis through the lesser sciatic foramen.
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This question is part of the following fields:
- Anatomy
- Basic Sciences
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Question 17
Incorrect
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Streptokinase is used to break down clots in some cases of myocardial infarction, pulmonary embolism, and arterial thromboembolism; however, it is not recommended to use it again after 4 days from the first administration. Which complication could arise from repeated use?
Your Answer:
Correct Answer: Allergic reaction
Explanation:Streptokinase belongs to a group of medications known as ‘fibrinolytics’ and is an extracellular metallo-enzyme produced by beta-haemolytic streptococci, used as an effective clot-dissolving medication in patients with myocardial infarction and pulmonary embolism. As Streptokinase is a bacterial product, the body has the ability to build up an immunity to it. Therefore, it is recommended that this medication should not be used again after four days from the first administration, as it may not be as effective and may also cause an allergic reaction.
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This question is part of the following fields:
- Basic Sciences
- Pathology
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Question 18
Incorrect
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The circle of Willis is an arterial anastomosis in the base of the brain and is one of the cerebrovascular safeguards in the brain. Where is the circle of Willis contained?
Your Answer:
Correct Answer: Cisterna basalis
Explanation:Cisterns refers to a system of intercommunicating pools formed by the subarachnoid space at the base of the brain and around the brainstem. Cisterna basalis/basal cistern (interpeduncular cistern) is found at the base of the brain between the two temporal lobes and it contains the arterial circle of Willis. The lumbar cistern is contained in the spinal canal while the foramen magna refers to the opening at the base of the skull though which the spinal cord enters into the skull.
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This question is part of the following fields:
- Anatomy
- Basic Sciences
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Question 19
Incorrect
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When one is silently counting, what part of his brain will show increased regional cerebral blood flow (rCBF)?
Your Answer:
Correct Answer: Supplementary motor area
Explanation:Regional cerebral blood flow (rCBF) increases in the superior speech cortex (supplementary motor area) during periods of silent counting, whereas speaking aloud will do so in the motor cortex and medial temporal lobe, along with the superior speech cortex.
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This question is part of the following fields:
- Basic Sciences
- Physiology
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Question 20
Incorrect
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A 12-year old girl was brought to the hospital with recurrent headaches for 6 months. Her physical examination revealed no abnormality. A CT scan of the head revealed a suprasellar mass with calcifications, eroding the surrounding sella turcica. The lesion is likely to represent:
Your Answer:
Correct Answer: Craniopharyngioma
Explanation:Craniopharyngiomas (also known as Rathke pouch tumours, adamantinomas or hypophyseal duct tumours) affect children mainly between the age of 5 and 10 years. It constitutes 9% of brain tumours affecting the paediatric population. These are slow-growing tumours which can also be cystic, and arise from the pituitary stalk, specifically the nests of epithelium derived from Rathke’s pouch. Histologically, this tumour shows nests of squamous epithelium which is lined on the outside by radially arranged cells. Calcium deposition is often seen with a papillary type of architecture.
ACTH-secreting pituitary adenomas are rare and mostly microadenomas. Paediatric astrocytoma’s usually occur in the posterior fossa. Although null cell adenomas can cause mass effect and give rise to the described symptoms, they are not suprasellar. Prolactinomas can also show symptoms of headache and disturbances in the visual field, however they are known to be small and slow-growing. -
This question is part of the following fields:
- Basic Sciences
- Pathology
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Question 21
Incorrect
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what is the cause of a prolonged PT(prothrombin time)?
Your Answer:
Correct Answer: Liver disease
Explanation:PT measure the intrinsic pathway of coagulation. It determines the measure of the warfarin dose regime, liver disease and vit K deficiency status along with the clotting tendency of blood. PT measured factors are II,V,VII,X and fibrinogen. It is used along with aPTT which measure the intrinsic pathway.
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This question is part of the following fields:
- Basic Sciences
- Physiology
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Question 22
Incorrect
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A 63 year old woman reports colicky abdominal pain and foul smelling diarrhoea on the 4th day following a cholecystectomy for acute cholecystitis. Her surgery was complicated as the gallbladder spilled stones intraoperatively. She has been on ciprofloxacin therapy ever since her surgery. Which of the following organisms is most likely responsible for her symptoms?
Your Answer:
Correct Answer: Clostridium difficile
Explanation:Clostridioides difficile (C. difficile; formerly known as Clostridium difficile) is a gram-positive rod-shaped bacillus that is commonly involved in antibiotic-associated diarrhoea. As the bacterial spores are difficult to eradicate and easily transmitted (via faecal-oral transmission), the C. difficile infection rate is particularly high among hospitalized patients and residents in long-term care facilities.
Colonization with C. difficile occurs following antibiotic treatment of other diseases, as the bacteria is particularly resistant to antibiotics. The resulting damage to the intestinal flora promotes infection, which may be accompanied by high fever, abdominal pain, and characteristically foul-smelling diarrhoea. The most severe form of C. difficile infection is pseudomembranous colitis, which may lead to ileus, sepsis, and toxic megacolon. In most cases, however, colonization results in asymptomatic carriage rather than symptomatic infection.
Diagnosis is usually made via detection of the C. difficile toxin and/or corresponding genes in stool samples. C. difficile infections are treated with oral vancomycin or oral fidaxomicin. Following diagnosis, strict adherence to hygiene measures and patient isolation is essential, especially in hospitals and other healthcare settings. -
This question is part of the following fields:
- Clinical Microbiology
- Principles Of Surgery-in-General
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Question 23
Incorrect
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Calculate the stroke volume in a patient admitted for coronary bypass surgery, with the following parameters pre-operatively: Oxygen consumption = 300 ml/min, Arterial oxygen content = 20 ml/100 ml blood, Pulmonary arterial oxygen content = 15 ml/100 ml blood and Heart rate = 100 beats/min.
Your Answer:
Correct Answer: 60 ml
Explanation:By Fick’s principle, cardiac output can be calculated as follows: VO2 = CO × (CAO2– CVO2) where VO2= oxygen consumption, CO = cardiac output, CAO2 = arterial oxygen content and CvO2 = mixed venous oxygen content. Thus, in the given problem, 300 ml/min = CO × (20 – 15) ml/100 ml CO = 300 × 100/5 ml/min CO = 6000 ml/min. Also, cardiac output = stroke volume × heart rate. Thus, 6000 ml/min = stroke volume × 100 beats/min. Hence, stroke volume = 6000/100 ml/min which is 60 ml/min.
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This question is part of the following fields:
- Basic Sciences
- Physiology
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Question 24
Incorrect
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A 44-year old gentleman presented to the hospital in congestive cardiac failure. On further investigation, he was found to have a right-sided retroperitoneal mass. On enquiry, he gave a history of intermittent hypertensive attacks. 24-hour urine specimen revealed raised metanephrine and vanillylmandelic acid levels. What is the likely diagnosis?
Your Answer:
Correct Answer: Pheochromocytoma
Explanation:A neuroendocrine tumour of the chromaffin cells in adrenal medulla, pheochromocytoma secretes excessive catecholamines – adrenaline (epinephrine) and noradrenaline (norepinephrine). Pheochromocytomas are also known as the ‘10% tumour’. This is because 10% of them are bilateral, 10% are malignant, and 10% are extra-adrenal. Extra-adrenal paragangliomas (also known as extra-adrenal pheochromocytomas) are less common than pheochromocytomas and arise in the ganglia of sympathetic nervous system. Around 25% of pheochromocytomas are familial. Symptoms are described as feeling of ‘impending doom’, and include tachycardia, hypertension, palpitations, anxiety, headaches and pallor. Orthostatic hypertension is typically seen where there is a more than 100 mmHg fall in systolic pressure when the patient stands up. Pheochromocytomas can also lead to malignant hypertension. Diagnosis is by measurement of catecholamines and metanephrines in blood or in 24-hour urine, after exclusion of other possible causes such as stress, hypoglycaemia and drugs (methyldopa, dopamine agonists, ganglion-blocking antihypertensive). Imaging is also needed to localize the tumour. Localization of the tumour can also be done by Iodine-131 meta-iodobenzylguanidine (I131-MIBG) imaging.
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This question is part of the following fields:
- Basic Sciences
- Pathology
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Question 25
Incorrect
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A tumour growing in the posterior mediastinum is found in a 40-year-old man who presented to the out patient clinic with chest pain. Such a tumour is likely to compress the following structure:
Your Answer:
Correct Answer: Oesophagus
Explanation:The boundaries of the posterior mediastinum are: the superiorly through the sternal angle and T4/5, inferiorly, the diaphragm, anteriorly, by the middle mediastinal structures and posteriorly by the spinal cord. Structures in the posterior mediastinum include the descending thoracic aorta, the azygos system, oesophagus, thoracic duct and lymph nodes. The great vessels and structures at the root of the lung are part of the middle mediastinum. The oesophagus is the only structure in the posterior mediastinum among the choices.
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This question is part of the following fields:
- Anatomy
- Basic Sciences
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Question 26
Incorrect
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A 40-year-old woman is suspected to have an ovarian cancer. Which tumour marker should be requested to confirm the diagnosis?
Your Answer:
Correct Answer: CA-125
Explanation:CA-125 is a protein that is used as a tumour marker. This substance is found in high concentration in patients with ovarian cancer. It is the only tumour marker recommended for clinical use in the diagnosis and management of ovarian cancer.
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This question is part of the following fields:
- Basic Sciences
- Pathology
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Question 27
Incorrect
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A 20-year-old African man is admitted to the hospital with acute severe abdominal pain. He has just flown to UK after a long-haul flight, and the pain developed mid-flight. On examination, there is tenderness in the left upper abdominal quadrant. His blood tests, done on his arrival, show:Hb: 5 g/dLWCC: 20 x 10^9/LRetic count: 30% What is the most likely underlying cause?
Your Answer:
Correct Answer: Sickle cell anaemia
Explanation:The combination of a high reticulocyte count and severe anaemia indicates aplastic crisis in patients with sickle cell anaemia. Another differential can be that of a transient aplastic crisis due to parvovirus. This is less likely as it causes reticulocytopenia rather than reticulocytosis.
Parvovirus B19 infects erythroid progenitor cells in the bone marrow and causes temporary cessation of red blood cell production. People who have underlying haematologic abnormalities such as sickle cell anaemia are at risk of cessation of red blood cell production if they become infected. This can result in a transient aplastic crisis. It is more common in people of African, Indian, and Middle Eastern backgrounds. Typically, these patients have a viral prodrome followed by anaemia, often with haemoglobin concentrations falling below 5.0 g/dL and reticulocytosis.
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This question is part of the following fields:
- Emergency Medicine And Management Of Trauma
- Principles Of Surgery-in-General
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Question 28
Incorrect
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A CT scan of 65 year old male patient at an outpatient clinic suggested a bone tumour at the stylomastoid foramen. Which of the following cranial nerves is likely to be affected with this tumour?
Your Answer:
Correct Answer: VII
Explanation:Cranial nerve VII, the facial nerve, is found in the internal acoustic canal and runs through this canal into the facial canal before exiting through the stylomastoid foramen. In the case of a bone tumour at the stylomastoid process, the facial nerve is the nerve that will most likely be affected.
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This question is part of the following fields:
- Anatomy
- Basic Sciences
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Question 29
Incorrect
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What is the normal duration of the ST segment?
Your Answer:
Correct Answer: 0.08 s
Explanation:The ST segment lies between the QRS complex and the T-wave. The normal duration of the ST segment is 0.08 s. ST-segment elevation or depression may indicate myocardial ischaemia or infarction.
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This question is part of the following fields:
- Basic Sciences
- Physiology
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Question 30
Incorrect
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In which of the following compartments of the femoral sheath is the femoral artery located?
Your Answer:
Correct Answer: Lateral compartment
Explanation:The femoral sheath also known as the crural sheath is made up of three compartments; lateral, intermediate and the medial. The femoral artery is contained in the lateral compartment of the femoral sheath while the femoral vein is in the intermediate compartment.
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This question is part of the following fields:
- Anatomy
- Basic Sciences
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SESSION STATS - PERFORMANCE PER SPECIALTY
