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Question 1
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A 15-year-old boy arrives at the clinic with a history of fainting. Physical examination shows a male habitus, height above 75th percentile, weight and occipitofrontal circumference both below 50th percentile. Pectus excavatum and pectus carinatum can be seen. Hand joints are markedly flexible, and fingers show arachnodactyly. His palate is high arched. ophthalmoscopic examination reveals ectopia lentis. On auscultation, a 2/6 soft, systolic ejection murmur can be heard at the upper right 2nd intercostal space which radiates to the carotids. BP is normal, and so are the respiratory, abdominal and neurological examinations. investigations show a dilated aorta. HIs cerebral MRI scan, magnetic resonance angiography, ECG and blood tests are unremarkable. From the information provided, the boy most likely has which of the following?
Your Answer: Marfan syndrome
Explanation:Individuals with Marfan syndrome are usually tall and slender, have elongated fingers and toes (arachnodactyly), loose joints, and have an arm span that exceeds their body height. Other common features include a long and narrow face, crowded teeth, an abnormal curvature of the spine (scoliosis or kyphosis), stretch marks (striae) not related to weight gain or loss, and either a sunken chest (pectus excavatum) or a protruding chest (pectus carinatum). Some individuals develop an abnormal accumulation of air in the chest cavity that can result in the collapse of a lung (spontaneous pneumothorax). A membrane called the dura, which surrounds the brain and spinal cord, can be abnormally enlarged (dural ectasia) in people with Marfan syndrome. Dural ectasia can cause pain in the back, abdomen, legs, or head. Most individuals with Marfan syndrome have some degree of near-sightedness (myopia). Clouding of the lens (cataract) may occur in mid-adulthood, and increased pressure within the eye (glaucoma) occurs more frequently in people with Marfan syndrome than in those without the condition.
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This question is part of the following fields:
- Endocrinology
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Question 2
Correct
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Which of the following statements is MOST appropriate regarding the features of Graves disease?
Your Answer: Association with HLA-DR3
Explanation:Graves disease is an autoimmune disorder in which patients present with thyrotoxicosis and related ophthalmopathy, and dermopathy. Many affected patients experience hyperthyroidism. Peak incidence of graves disease is after the 3rd decade of life and is more common in women than in men. Graves susceptibility is association with HLA-DR3. Clinical features of Graves disease include an increased metabolic rate, heat intolerance, irritability, weight loss despite increasing appetite, diarrhoea palpitations, chemosis, acropachy and onycholysis.
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This question is part of the following fields:
- Endocrinology
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Question 3
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A 10-year-old girl with type-1 diabetes mellitus presents with vomiting and rapid breathing. A diagnosis of acute diabetic ketoacidosis was made. Which of the following regarding management is incorrect?
Your Answer: Bolus of insulin recommended
Explanation:The following methods are adopted for the treatment of DKA:
– Fluids: Bolus of 10 ml/kg of normal saline. Stop at three boluses to avoid precipitating cerebral oedema. The remaining deficit has to be corrected over 48 hours. Strict input/output, U&E, and pH monitoring is necessary in such patients.
– Insulin: Insulin infusion can be initiated at 0.05-0.1 unit/kg/hour. It is essential to monitor blood glucose closely, and the aim is to decrease by 2 mmol/hour.
– Potassium: Initially, it will be high, but following insulin administration, the levels drop quickly as K+ enters cells with glucose, and thus, replacement is almost always necessary.
– Acidosis: Bicarbonate is avoided unless pH is less than 7. Acidosis will get corrected with the correction of fluid and insulin deficits. The definitive treatment is directed towards correcting the underlying precipitants of DKA, e.g. sepsis, infections.
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This question is part of the following fields:
- Endocrinology
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Question 4
Correct
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The following is a sleep-related hormone released in an intermittent manner:
Your Answer: Prolactin
Explanation:Hormones can be secreted in a number of different ways, thus plasma levels of each may vary throughout the day. Many of these exhibit intermittent secretion related to sleep (growth hormone, and prolactin), while others are released based on circadian rhythms (cortisol). Some are released in a pulsatile fashion throughout the day such as FSH, LH, Thyroxine, while others are stress related like cortisol.
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This question is part of the following fields:
- Endocrinology
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Question 5
Correct
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A 16-year-old boy is brought to the clinic by his parents, who are concerned that he is shorter than the other boys at school, despite having attained puberty. His father is 1.70 m tall, and his mother is 1.50 m tall. Given his parents height, what is his adult height potential?
Your Answer: 1.67 m
Explanation:The adult height potential may be calculated for a male child by (father’s height in cm + mother’s height in cm) / 2 then add 7 cm.In the scenario provided: (170 + 150)/2 + 7 = 167 cm = 1.67 m.For a female child by (father’s height in cm + mother’s height in cm) / 2 then minus 7 cm.This can then be plotted on a height centile chart to find the mid-parental centile.Causes of short stature include:- Normal variant (often familial)- Constitutional delay of growth and puberty- Chronic illness, e.g. cystic fibrosis, inflammatory bowel disease- Endocrine: growth hormone deficiency, hypothyroidism, steroid excess syndromes: Turner’s, Down’s, Prader-Willi- Skeletal dysplasias, e.g. achondroplasia
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This question is part of the following fields:
- Endocrinology
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Question 6
Correct
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Which of the given clinical features is found in multiple endocrine neoplasia (MEN) type 1?
Your Answer: Carcinoid tumours
Explanation:Multiple endocrine neoplasia type 1 is a rare, autosomal dominant disorder characterized by a higher propensity to develop various endocrine and nonendocrine tumours. The primary endocrine tumours that are a part of this disorder include carcinoid tumours and tumours of parathyroid, enteropancreatic, and anterior pituitary origin. Carcinoid tumours encountered in MEN type 1 are mostly of the foregut region. Non-endocrine tumours found in MEN type 1 include meningiomas and ependymomas, lipomas, angiofibromas, collagenomas, and leiomyomas. The pathogenesis of MEN type 1 is the inactivating mutation of the tumour suppressor gene MEN 1, which encodes the protein menin.
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This question is part of the following fields:
- Endocrinology
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Question 7
Correct
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A 5 year old diabetic boy had a blood sugar level of 3.0 mmol/L before eating a large meal at 6pm, presents with difficulties raising his blood glucose after the meal. His parents gave him a slightly lower insulin dose with the meal than usual. Blood glucose levels are not rising above 6 mmol/L. Parents are worried and do not want to send him to bed. What is the single most appropriate advice for the parents?
Your Answer: A fast acting glucose source would have been preferable to treat the hypoglycaemia and should be considered in the future
Explanation:The boy presented with mild hypoglycaemia and should be managed at home with fast-acting carbs. He should not sleep immediately. His parents should monitor his blood glucose every hour without letting him sleep in between.
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This question is part of the following fields:
- Endocrinology
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Question 8
Correct
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Which of the following produces the maximum levels of cortisol in the body?
Your Answer: Zona fasciculata of the adrenal
Explanation:Zona fasciculata of the adrenal produces the maximum levels of cortisol in the body.Functions of cortisol:- Increases blood pressure: permits normal response to angiotensin II and catecholamines by up-regulating alpha-1 receptors on arterioles.- Inhibits bone formation: decreases osteoblasts, type 1 collagen and absorption of calcium from the gut, and increases osteoclastic activity.- Increases insulin resistance.- Increases gluconeogenesis, lipolysis and proteolysis.- Inhibits inflammatory and immune responses.- Maintains function of skeletal and cardiac muscle.An excess of corticosteroids in the body causes various symptoms that are a part of Cushing’s syndrome.
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This question is part of the following fields:
- Endocrinology
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Question 9
Correct
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A 17-year-old Jewish girl presents with primary amenorrhoea. On examination, she looks a little hirsute and has evidence of facial acne. She is within her predicted adult height and has normal breast and external genitalia development, however, there is excess hair over her lower abdomen and around her nipple area.Investigations were as follows:Hb 13.1 g/dlWCC 8.6 x109/lPLT 201 x109/lNa+ 139 mmol/lK+ 4.5 mmol/lCreatinine 110 µmol/l17-OH progesterone 1.4 times the upper limit of normalPelvic ultrasound: bilateral ovaries and uterus visualised.Which of the following is the most likely diagnosis?
Your Answer: Non-classical congenital adrenal hyperplasia
Explanation:Mild deficiencies of 21-hydroxylase or 3-beta-hydroxysteroid dehydrogenase activity may present in adolescence or adulthood with oligomenorrhea, hirsutism, and/or infertility. This is termed nonclassical adrenal hyperplasia.Late-onset or nonclassical congenital adrenal hyperplasia (NCAH) due to 21-hydroxylase deficiency is one of the most common autosomal recessive disorders. Reported prevalence ranges from 1 in 30 to 1 in 1000. Affected individuals typically present due to signs and symptoms of androgen excess. Treatment needs to be directed toward the symptoms. Goals of treatment include normal linear growth velocity, a normal rate of skeletal maturation, ‘on-time’ puberty, regular menstrual cycles, prevention of or limited progression of hirsutism and acne, and fertility. Treatment needs to be individualized and should not be initiated merely to decrease abnormally elevated hormone concentrations.Normal Ultrasound rules out Turner’s syndrome.
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This question is part of the following fields:
- Endocrinology
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Question 10
Incorrect
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What is the average age that puberty starts in boys?
Your Answer: 11 years
Correct Answer: 12 years
Explanation:Puberty is when a child’s body begins to develop and change as they become an adult.The average age for girls to begin puberty is 11, while for boys the average age is 12.It’s completely normal for puberty to begin at any point from the ages of 8 to 14. The process can take up to 4 years.
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This question is part of the following fields:
- Endocrinology
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