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Question 1
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Which one of the following factors is the most likely etiological factor for abnormally short stature amongst children?
Your Answer: Familial short stature
Explanation:Familial/inherited short stature is the most likely and commonest factor resulting in short stature among the children. Klinefelter syndrome is characterised by tall stature, widely spaces nipples and infertility. Other factors include congenital heart disease, maternal deprivation and diabetes mellitus but these are the rare causes.
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This question is part of the following fields:
- Genetics And Dysmorphology
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Question 2
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A 6 week old female patient was brought by her mother to the emergency department with icterus. Although she's had a good appetite, and breast-feeding well, she hasn't gained any weight. Her mother noticed that her stools are pale while her urine is noticeably dark. What is the most probable diagnosis?
Your Answer: Biliary atresia
Explanation:Biliary atresia is a rare condition that usually becomes symptomatic 2 to 8 weeks after birth. It can be congenital or acquired. Typical symptoms include jaundice, weight loss, dark urine and pale stools.
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This question is part of the following fields:
- Gastroenterology And Hepatology
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Question 3
Correct
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What is the cause for tinea incognito?
Your Answer: Inappropriate treatment with steroid cream
Explanation:“Tinea incognito” is a term used to describe a tinea infection modified by topical steroids. It is caused by prolonged use of topical steroids, sometimes prescribed as a result of incorrect diagnosis. Topical steroids suppress the local immune response and allow the fungus to grow easily. As a result, the fungal infection may take on the bizarre appearance seen in this patient.The diagnosis of tinea incognito is simple to confirm by microscopic visualization of branching hyphae and spores typical of dermatophytes in a potassium hydroxide preparation.Treatment of tinea incognito requires cessation of all topical steroid use and implementation of specific antifungal treatment. A low-potency corticosteroid may be used briefly to avoid the flare often associated with abrupt cessation of a potent steroid. Patients should be warned of this possibility so they do not reinstitute use of topical steroids on their own.
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This question is part of the following fields:
- Dermatology
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Question 4
Incorrect
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A child defecates a few minutes after being fed by the mother. This is most likely due to:
Your Answer: Oesophagoenteric reflex
Correct Answer: Gastrocolic reflex
Explanation:The gastrocolic reflex is a physiological reflex that involves increase in colonic motility in response to stretch in the stomach and by-products of digestion in the small intestine. It is shown to be uneven in its distribution throughout the colon, with the sigmoid colon affected more than the right side of the colon in terms of a phasic response. Various neuropeptides have been proposed as mediators of this reflex, such as serotonin, neurotensin, cholecystokinin and gastrin.
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This question is part of the following fields:
- Gastroenterology And Hepatology
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Question 5
Correct
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A new treatment reduces blood pressure for hypertensive patients by 10 mmHg more than the current standard treatment (95% confidence interval minus 2 to 22).Which of the following statements is most accurate?
Your Answer: The difference is not statistically significant
Explanation:If the 95% confidence interval contains zero (more precisely, the parameter value specified in the null hypothesis), then the effect will not be significant at the 0.05 level.If the 95% CI for the DIFFERENCE between the 2 groups contains the value 0, this means that the p-value will be greater than 0.05. Conversely, if the 95% CI does not contain the value 0, then the p-value will be strictly less than 0.05. The same applies when comparing groups using a ratio, such as an odds ratio or risk ratio. When using a RATIO instead of a DIFFERENCE, the situation of no difference between the 2 groups will be indicated by a value of 1 instead of 0. If the ratio equals to 1, the 2 groups are equal. Hence, if the 95% CI of the ratio contains the value 1, the p-value will be greater than 0.05. Alternatively, if the 95% CI does not contain the value 1, the p-value is strictly less than 0.05.
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This question is part of the following fields:
- Epidemiology And Statistics
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Question 6
Incorrect
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The mother of 6 months old girl tests positive for HIV. Doctors test her daughter as well and the results turn out to be positive for HIV, both by polymerase chain reaction (PCR) and serology. The girl is clinically healthy and seems to attain normal developmental milestones. Which of the following is the most appropriate next step?
Your Answer: Start co-trimoxazole prophylaxis and antiretroviral therapy immediately
Correct Answer: Start co-trimoxazole prophylaxis immediately and plan to start antiretrovirals once further work-up is complete
Explanation:Infants exposed to maternal HIV and with positive results require immediate management with co-trimoxazole prophylaxis, regardless of their CD4 levels. Antiretroviral treatment is necessary as well but it could wait until further work-up is complete.
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This question is part of the following fields:
- HIV
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Question 7
Incorrect
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A 16-year-old boy presents to the emergency department with abdominal pain, fever, and vomiting. On examination, palpation of the left lower quadrant of the abdomen elicits pain in the right lower quadrant. What is this sign?
Your Answer: Murphy's sign
Correct Answer: Rovsing's sign
Explanation:Based on the findings presented, the sign elicited is Rovsing’s sign.Rovsing’s sign:It is a sign suggestive of appendicitis. A positive sign is determined when palpation in the left lower quadrant of a patient’s abdomen causes pain in the right lower quadrant.Other options:- Murphy’s sign is positive in gallbladder inflammation. With the upper border of the examiner’s hand in the right upper quadrant of the abdomen under the rib cage, the patient is asked to inhale. Inhalation causes the gallbladder to descend, which catches on the fingers, causing pain.- Cullen’s sign is suggestive of ectopic pregnancy or acute pancreatitis and describes the bruising around the umbilicus.- Tinel’s sign is positive in those with carpal tunnel syndrome. The examiner’s fingers tap the median nerve over the flexor retinaculum, which causes paraesthesia over the distribution of the median nerve.- Battles’ sign describes bruising behind the ear, suggesting a basal skull fracture of the posterior cranial fossa.
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This question is part of the following fields:
- Emergency Medicine
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Question 8
Incorrect
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Which of the following changes can be seen on a blood film post-splenectomy?
Your Answer: Teardrop-shaped cells
Correct Answer: Target cells
Explanation:The diagnosis of a post-splenectomy/hyposplenism blood picture can be made reliably by identifying Howell Jolly bodies in routine Wright-Giemsa stained blood and target cells. These are round basophilic bodies in red blood cells that represent residual nuclear material from marrow nucleated red cell precursors that are usually culled out by the spleen.These do not occur in individuals with normally functioning splenic tissue and their presence indicates either 1) an asplenic state or 2) hypofunctioning splenic tissue as might be seen in a patient with late-stage sickle cell anaemia. Their presence in an individual with splenomegaly leads to a narrow differential diagnosis and their absence in a splenectomised individual indicates accessory splenic Heinz bodies and poikilocytosis typically increase in a splenectomised individual and care must be taken not to overdiagnose haemolysis in such an individual.
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This question is part of the following fields:
- Haematology And Oncology
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Question 9
Correct
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A 16-year-old girl was brought to the ED by her gym instructor after developing severe shortness of breath and chest pain at the gym. She has a history of asthma since childhood. Her skin colour looked normal| however, breath sounds were found to be diminished on auscultation of the right lung. Which investigation will you order first?
Your Answer: Chest x-ray
Explanation:Asthma patients have an increased risk of developing complications like pneumonia or collapsed lung. A clear visualization of the lungs through a CXR will define the management necessary for this patient.
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This question is part of the following fields:
- Respiratory
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Question 10
Incorrect
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What serious side effect would you expect, after giving IV lorazepam to a 4-year-old boy suffering from febrile convulsions?
Your Answer: Amnesia
Correct Answer: Apnoea
Explanation:Lorazepam is known to cause respiratory depression and finally apnoea as a side effect.
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This question is part of the following fields:
- Pharmacology
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