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Question 1
Correct
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What role does adrenocorticotrophic hormone (ACTH) play in the body?
Your Answer: Stimulation of the release of glucocorticoids
Explanation:The Adrenal Cortex and Pituitary Gland
The adrenal cortex is composed of two layers, the cortical and medullary layers. The zona glomerulosa of the adrenal cortex secretes aldosterone, while the zona fasciculata secretes glucocorticoids and the zona reticularis secretes adrenal androgens. However, both layers are capable of secreting both glucocorticoids and androgens. The release of glucocorticoids from the adrenal cortex is stimulated by ACTH.
Antidiuretic hormone (ADH), also known as vasopressin, is secreted from the posterior pituitary and acts on the collecting ducts of the kidney to promote water reabsorption. Growth hormone, secreted by the anterior pituitary, promotes the growth of soft tissues. Prolactin secretion from the anterior pituitary is under inhibitory control from dopamine.
In summary, the adrenal cortex and pituitary gland play important roles in regulating hormone secretion and bodily functions. The adrenal cortex is responsible for the secretion of aldosterone, glucocorticoids, and adrenal androgens, while the pituitary gland secretes ADH, growth hormone, and prolactin.
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This question is part of the following fields:
- Endocrinology
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Question 2
Incorrect
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A 16-year-old boy with an 8-year history of type I diabetes presents to the Emergency Department (ED) with a 24-hour history of vomiting. He tested his glucose and ketones at home and they were both high, glucose 30 mmol/L, ketones 3 mmol/L, so he attended the ED. He admits to omitting his insulin frequently. He appears dehydrated, has ketotic fetor, BP 112/76 mmHg, pulse 108 beats per minute, temp 37 degrees, oxygen saturations 98% on room air. Clinical examination is otherwise normal. The following are his laboratory investigations:
Test Result Normal range
pH 7.2 7.35–7.45
Ketones 3 mmol/l < 0.6 mmol/l
Glucose 28 mmol/l 3.5–5.5 mmol/l
Bicarbonate 11 mmol/l 24–30 mmol/l
Base excess -5 mEq/l −2 to +2 mEq/l
C-reactive protein (CRP) 3 mg/l 0–10 mg/l
What is required to make a diagnosis of diabetic ketoacidosis in this patient?Your Answer: pH<7.30
Correct Answer:
Explanation:Understanding Diabetic Ketoacidosis: Diagnostic Criteria and Metabolic Imbalance
Diabetic ketoacidosis (DKA) is a life-threatening complication of type 1 diabetes that results from a complex metabolic imbalance. The diagnostic criteria for DKA include hyperglycaemia (glucose >11 mmol/l), ketosis (>3 mmol/l), and acidemia (pH <7.3, bicarbonate <15 mmol/l). DKA is caused by insulin deficiency and an increase in counterregulatory hormones, which lead to enhanced hepatic gluconeogenesis and glycogenolysis, severe hyperglycaemia, and enhanced lipolysis. The resulting accumulation of ketone bodies, including 3-beta hydroxybutyrate, leads to metabolic acidosis. Fluid depletion, electrolyte shifts, and depletion are also common in DKA. While anion gap is not included in the UK diagnostic criteria, it is typically high in DKA (>10). Understanding the diagnostic criteria and metabolic imbalance of DKA is crucial for its prevention and management.
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This question is part of the following fields:
- Endocrinology
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Question 3
Incorrect
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A 32-year-old woman presents with sudden onset of abdominal pain. She has a medical history of polycystic kidney disease and is currently taking alfacalcidol, ramipril, Renagel, and EPO injections. Her eGFR upon admission is 24 ml/min/1.73 m2. What analgesic would you recommend for her pain?
Your Answer: Morphine sulphate 5 mg 2-4 hourly
Correct Answer: Paracetamol 1 g QDS
Explanation:Medication Considerations for Patients with Renal Dysfunction
Patients with renal dysfunction should avoid taking NSAIDs as they can worsen their condition and increase the risk of gastrointestinal bleeding, which is already a common complication of chronic renal failure. Instead, alternative pain management options should be explored. If opiates are necessary, they should be prescribed with caution as they can accumulate in the body due to reduced renal excretion, especially in patients who have not previously taken them. It is important for healthcare providers to carefully consider the potential risks and benefits of any medication before prescribing it to a patient with renal dysfunction. Proper medication management can help prevent further damage to the kidneys and improve overall patient outcomes.
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This question is part of the following fields:
- Endocrinology
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Question 4
Incorrect
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A 55-year-old man with a history of hypertension and type 2 diabetes presents to the Emergency department with complaints of central chest pain that radiates down his left arm. He is currently taking ramipril, metformin, atorvastatin, and gliclazide. On examination, his blood pressure is 129/72 mmHg, and his pulse is 81. Bibasal crackles are heard on auscultation of his chest.
The following investigations were conducted:
- Haemoglobin: 138 g/L (130-180)
- White cell count: 8.9 ×109/L (4-11)
- Platelet: 197 ×109/L (150-400)
- Sodium: 141 mmol/L (135-146)
- Potassium: 4.1 mmol/L (3.5-5)
- Creatinine: 123 µmol/L (79-118)
- Glucose: 12.3 mmol/L (<7.0)
- ECG: Anterolateral ST depression
The patient is given sublingual GTN. What is the next most appropriate therapy?Your Answer: Beta blockade
Correct Answer: Aspirin 300 mg, clopidogrel 300 mg and unfractionated heparin
Explanation:Treatment Plan for High-Risk Patient with Type 2 Diabetes Mellitus
This patient, who has a history of type 2 diabetes mellitus, is considered high risk and requires immediate treatment. The recommended treatment plan includes loading the patient with both aspirin and clopidogrel to reduce the risk of further complications. If the patient experiences further chest pain or if ECG signs do not improve, additional interventions such as angiography may be necessary.
In addition to aspirin and clopidogrel, unfractionated heparin is also recommended as an alternative to fondaparinux for patients who are likely to undergo coronary angiography within 24 hours of admission. If the patient does not progress to angiogram, screening for ischaemia should be considered prior to discharge.
Overall, it is important to closely monitor this high-risk patient and adjust the treatment plan as necessary to ensure the best possible outcome.
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This question is part of the following fields:
- Endocrinology
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Question 5
Incorrect
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A floppy 1-month-old infant presented with vomiting, weight loss and circulatory collapse. Blood tests demonstrated hyponatraemia and hyperkalaemia. Further tests confirmed metabolic acidosis and hypoglycaemia. The paediatrician noticed that the penis was enlarged and the scrotum pigmented. The child was treated with both a glucocorticoid and a mineralocorticoid.
What is the most likely underlying diagnosis?Your Answer: Addisonian crisis
Correct Answer: Congenital adrenal hyperplasia
Explanation:Congenital adrenal hyperplasia is a group of genetic conditions that affect the production of hormones and steroids from the adrenal glands. The most common cause is a deficiency in the enzyme 21-hydroxylase. This leads to overactivity of the steroid-producing cells and inadequate cortisol production, resulting in an excess of mineralocorticoids and androgens/oestrogens. Symptoms can include ambiguous genitalia at birth in females, hyperpigmentation and penile enlargement in males, and biochemical abnormalities such as hyponatraemia and hyperkalaemia. Treatment involves hormone replacement therapy. Addisonian crisis is a potentially fatal episode caused by glucocorticoid and mineralocorticoid deficiency, usually occurring in adulthood and precipitated by stress. It presents with hyponatraemia, hyperkalaemia, hypoglycaemia and hypercalcaemia, and is managed with urgent administration of glucocorticoids. Conn syndrome is associated with primary hyperaldosteronism and presents with hypernatraemia and hypokalaemia. Cushing syndrome is due to cortisol excess and presents with weight gain, hypertension, oedema, hyperglycaemia, hypokalaemia and skin pigmentation. Thyrotoxic crisis is a life-threatening condition associated with excessive production of thyroid hormones, presenting with a range of symptoms including tachycardia, hypertension, fever, poor feeding, weight loss, diarrhoea, nausea, vomiting, seizures and coma. Prompt treatment is essential to prevent serious complications.
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This question is part of the following fields:
- Endocrinology
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Question 6
Incorrect
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A 30-year-old female patient complains of anxiety and weight loss. During the examination, a fine tremor of the outstretched hands, lid lag, and a moderate goitre with a bruit are observed. What is the probable diagnosis?
Your Answer: Hashimoto's thyroiditis
Correct Answer: Graves' disease
Explanation:Thyroid Disorders and their Differentiation
Thyroid disorders are a common occurrence, and their diagnosis is crucial for effective treatment. One such disorder is Graves’ disease, which is characterized by a goitre with a bruit. Unlike MNG, Graves’ disease is associated with angiogenesis and thyroid follicular hypertrophy. Other signs of Graves’ disease include eye signs such as conjunctival oedema, exophthalmos, and proptosis. Additionally, pretibial myxoedema is a dermatological manifestation of this disease.
De Quervain’s thyroiditis is another thyroid disorder that follows a viral infection and is characterized by painful thyroiditis. Hashimoto’s thyroiditis, on the other hand, is a chronic autoimmune degradation of the thyroid. Multinodular goitre (MNG) is the most common form of thyroid disorder, leading to the formation of multiple nodules over the gland. Lastly, a toxic thyroid nodule is a solitary lesion on the thyroid that produces excess thyroxine.
In conclusion, the different types of thyroid disorders and their symptoms is crucial for accurate diagnosis and effective treatment.
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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 27-year-old woman visits her GP for a routine health examination before beginning a new job. During the examination, thyroid function tests are conducted on her serum, which reveal elevated thyroid-stimulating hormone (TSH), reduced total thyroxine (T4), reduced free T4, and reduced triiodothyronine (T3) uptake. What is the most probable clinical manifestation that this patient will exhibit?
Your Answer: Weight gain
Explanation:Understanding the Symptoms of Hypothyroidism and Hyperthyroidism
Hypothyroidism and hyperthyroidism are two conditions that affect the thyroid gland, resulting in a range of symptoms. In hypothyroidism, there is a decrease in T4/T3, leading to symptoms such as lethargy, weight gain, depression, sensitivity to cold, myalgia, dry skin, dry hair and/or hair loss, constipation, menstrual irregularities, carpal tunnel syndrome, memory problems, difficulty concentrating, and myxoedema coma (a medical emergency). On the other hand, hyperthyroidism results in an increase in thyroid hormones, causing symptoms such as hyperactivity, diarrhea, heat intolerance, and tachycardia. Understanding these symptoms can help in the diagnosis and management of these conditions.
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This question is part of the following fields:
- Endocrinology
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Question 8
Incorrect
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A 50-year-old woman with a history of severe depression and a radical mastectomy for breast carcinoma one year ago presents with complaints of polyuria, nocturia, and excessive thirst. Her laboratory values show a serum sodium of 130 mmol/L (133-145), serum potassium of 3.6 mmol/L (3.5-5), serum calcium of 2.2 mmol/L (2.2-2.6), glucose of 5.8 mmol/L (3.5-6), urea of 4.3 mmol/L (3-8), and urine osmolality of 150 mosmol/kg (350-1000). What is the most likely diagnosis?
Your Answer: Diabetes insipidus
Correct Answer: Psychogenic polydipsia
Explanation:Psychogenic Polydipsia
Psychogenic polydipsia is a rare condition where a person drinks excessive amounts of water without any physiological reason to do so. This disorder is usually well-tolerated unless it leads to hyponatremia. Psychogenic polydipsia is commonly observed in hospitalized schizophrenics, depressed patients, and children. The diagnosis of this condition is made by excluding other possible causes and requires specialized investigation and management. The water deprivation test is the most important test for diagnosing psychogenic polydipsia.
In contrast, diabetes insipidus is a condition caused by a lack of action of ADH, which results in high osmolality and high sodium levels, leading to dehydration. This condition causes inappropriately dilute urine. To exclude diabetes insipidus, a water deprivation test is required. However, in patients with psychogenic polydipsia, the urine becomes appropriately concentrated upon water deprivation, whereas in diabetes insipidus, the urine remains dilute.
In this patient, the history of depression, relative dilution of sodium, and low urine osmolality suggest a diagnosis of psychogenic polydipsia. The presence of hyponatremia further supports this diagnosis. Therefore, it is important to consider psychogenic polydipsia as a possible cause of excessive water drinking in patients with hyponatremia.
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This question is part of the following fields:
- Endocrinology
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Question 9
Incorrect
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A 28-year-old woman visited her GP complaining of low mood, weight gain, and irregular menstrual cycles. The GP conducted some tests and referred her to the hospital. The results of the investigations were as follows:
- Sodium: 150 mmol/l (135–145 mmol/l)
- Potassium: 2.5 mmol/l (3.5–5 mmol/l)
- Fasting blood glucose: 7.7 mmol/l (5–7.2 mmol/l)
- 24-hour urinary cortisol excretion: 840 nmol/24 hours (<300 nmol/24 hours)
- Plasma adrenocorticotropic hormone (ACTH): undetectable
- Dexamethasone suppression test:
- 0800 h serum cortisol after dexamethasone 0.5 mg/6 hours orally (po) for 2 days: 880 nmol/l (<50 nmol/l)
- 0800 h serum cortisol after dexamethasone 2 mg/6 hours po for 2 days: 875 nmol/l (<50 nmol/l)
What is the most probable clinical diagnosis?Your Answer:
Correct Answer: Adrenocortical tumour
Explanation:Adrenocortical Tumour: Localizing the Source of Excessive Cortisol Production
Cushing’s syndrome is characterized by the overproduction of glucocorticoids, which can lead to weight gain, mood disturbances, and irregular menses. In this case, the patient has proven high 24-hour urinary cortisol excretion, indicating excessive cortisol levels. However, the lack of response to low-dose dexamethasone and the low potassium and high sodium levels suggest that an adrenocortical tumour is the most likely cause.
An adrenocortical tumour results in excess cortisol secretion by the adrenal glands, leading to negative feedback at the pituitary level and very low or undetectable levels of ACTH. This is consistent with the patient’s presentation, ruling out Cushing’s disease, Conn’s syndrome, and acromegaly. Additionally, the absence of detectable ACTH levels rules out paraneoplastic syndrome secondary to small cell carcinoma of the lung.
In conclusion, the patient’s clinical picture and test results suggest an adrenocortical tumour as the source of excessive cortisol production.
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This question is part of the following fields:
- Endocrinology
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Question 10
Incorrect
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A 30-year-old man has been diagnosed with Addison's disease after presenting with symptoms of fatigue, weakness, gastrointestinal upset, and skin hyperpigmentation. Which adrenal hormone deficiency is typically responsible for the loss of sodium and water in Addison's disease?
Your Answer:
Correct Answer: Aldosterone
Explanation:Hormones Affected in Addison’s Disease
Addison’s disease is a condition where the adrenal glands do not produce enough hormones. This can lead to a variety of symptoms, including salt wasting and hyperkalaemia. Here are the hormones affected in Addison’s disease:
1. Aldosterone: Produced in the adrenal cortex, aldosterone is responsible for reabsorbing sodium and secreting potassium in the kidney. In Addison’s disease, aldosterone levels are low, leading to salt wasting and hyperkalaemia.
2. Cortisol: Low cortisol levels are a diagnostic marker for Addison’s disease. While cortisol does affect sodium homeostasis, its deficiency alone does not lead to salt wasting.
3. Adrenaline: The function of the adrenal medulla, which produces adrenaline, is preserved in Addison’s disease.
4. Angiotensin: While angiotensin does affect sodium reabsorption in the kidney, its levels would not be low in Addison’s disease.
5. Adrenocorticotropic hormone (ACTH): Levels of ACTH are high in Addison’s disease, which leads to the characteristic skin pigmentation.
Understanding the hormones affected in Addison’s disease can help with diagnosis and treatment of this condition.
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This question is part of the following fields:
- Endocrinology
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Question 11
Incorrect
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A 50-year-old woman presents to her general practitioner, complaining of a lump in her neck. She is a non-smoker and has no significant past medical history. On examination, there is a 2-cm firm, non-tender nodule on the left side of the anterior triangle of the neck, in the area of the thyroid.
Investigations:
Thyroid stimulating hormone: 2.5 mu/l (0.4–4.0 mu/l)
Fine-needle aspiration biopsy: partial papillary architecture with some thyroid follicles present. Thyrocytes are abnormally large with an abnormal nucleus and cytoplasm and frequent mitoses. Psammoma bodies are also demonstrated in the sample.
Which of the following fits best with the underlying diagnosis?Your Answer:
Correct Answer: Papillary thyroid carcinoma
Explanation:Thyroid Cancer Types and Diagnosis
Thyroid cancer can be classified into different types based on the cells involved. Papillary thyroid carcinoma is the most common type, where the papillary architecture of the thyroid is partially preserved. Surgery followed by radioiodine therapy is the standard treatment for this condition. Medullary thyroid carcinoma is less common and results in elevated calcitonin levels. Non-toxic multinodular goitre can be diagnosed through fine-needle aspiration biopsy, which shows colloid nodules. Follicular thyroid carcinoma exhibits variable morphology and is not consistent with fine-needle aspiration biopsy findings. Solitary toxic nodule can be ruled out if thyroid function is within normal limits. Proper diagnosis and treatment can lead to a high survival rate for patients under 40 years of age with papillary thyroid carcinoma.
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This question is part of the following fields:
- Endocrinology
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Question 12
Incorrect
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A 12-year-old boy is presenting with nocturnal enuresis, poor academic performance, and easy fatigue with physical activity. A full examination, including blood pressure, is unremarkable. Laboratory results show elevated WBC count and high bicarbonate levels. The 24-hour urine test reveals high potassium levels and low sodium levels. What is the likely diagnosis?
Your Answer:
Correct Answer: Bartter's syndrome
Explanation:Bartter’s Syndrome: A Rare Condition with Unique Symptoms
Bartter’s syndrome is a rare condition that is usually diagnosed in childhood. It is characterized by polyuria, nocturnal enuresis, and growth retardation. Patients with this syndrome also experience hypokalaemic metabolic alkalosis with urinary potassium wasting. This is due to the hyperplasia of the juxtaglomerular apparatus.
The absence of hypertension in the patient makes it unlikely that they have Conn’s or renal artery stenosis. Bartter’s syndrome is a unique condition that presents with specific symptoms and laboratory findings. It is important for healthcare providers to be aware of this condition and consider it in the differential diagnosis of patients with similar symptoms. Early diagnosis and treatment can improve the patient’s quality of life and prevent complications.
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This question is part of the following fields:
- Endocrinology
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Question 13
Incorrect
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A 14-year-old girl (who has been recently diagnosed with anorexia nervosa) exercises regularly. During one period of exercise, she becomes very light-headed. Several minutes later, she breaks into a sweat and develops palpitations. A friend takes her to an Emergency Department where a serum glucose of 2.2 mmol/l is demonstrated. The patient is given a soft drink to sip and feels better half an hour later.
Which of the following hormones most likely triggered the sweating and palpitations the patient experienced?Your Answer:
Correct Answer: Epinephrine
Explanation:Hormones and their Role in Hypoglycaemia
Hypoglycaemia, or low blood sugar, can be caused by various factors including exercise and minimal glycogen and lipid stores. Hormones play a crucial role in the body’s response to hypoglycaemia.
Epinephrine is released in response to hypoglycaemia and promotes hepatic glucose production and release. Adrenocorticotropic hormone (ACTH) triggers cortisol release, which stimulates gluconeogenesis over several hours. Calcitonin modulates serum calcium levels but does not play a direct role in hypoglycaemia.
Insulin secretion is associated with hypoglycaemia but does not cause symptoms such as sweating or palpitations. Similarly, thyroxine can cause similar symptoms but is not responsible for a specific role in the body’s response to hypoglycaemia. Understanding the role of hormones in hypoglycaemia can aid in its diagnosis and management.
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This question is part of the following fields:
- Endocrinology
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Question 14
Incorrect
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A 56-year-old male presents to the general practitioner (GP) with worries about his facial appearance, which he believes has changed significantly over the past five years. He also reports that his shoes no longer fit properly, and that his hands seem larger. The GP suspects that he may be suffering from acromegaly, and the patient is referred to the Endocrinology Department for further evaluation and treatment.
Regarding acromegaly, which of the following statements is accurate?Your Answer:
Correct Answer: There is an increased risk of colon cancer
Explanation:Understanding Acromegaly: Symptoms, Causes, and Risks
Acromegaly is a rare hormonal disorder that results from excess growth hormone (GH) in adulthood. This condition is typically caused by a pituitary tumour, which secretes GH and insulin growth factor 1 (IGF-1), leading to increased cellular growth and turnover. Unfortunately, this increased cellular activity also increases the risk of colon cancer.
While an enlarged upper jaw is often associated with acromegaly, it is actually the lower jaw that is more commonly affected, resulting in the classic underbite seen in these patients. Additionally, untreated acromegaly can lead to osteoarthritis, which is associated with excessive cartilage and connective tissue growth, but not autoimmune destruction of the joint.
It is important to recognize the symptoms of acromegaly, such as enlarged hands and feet, thickened skin, and deepening of the voice, as early diagnosis and treatment can prevent further complications.
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This question is part of the following fields:
- Endocrinology
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Question 15
Incorrect
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A 65-year-old patient presents with decompensated liver disease due to hepatocellular carcinoma. She is currently encephalopathic and has an INR of 6. What low-dose medication can be safely administered?
Your Answer:
Correct Answer: Codeine
Explanation:Adjusting Drug Dosages for Patients with Hepatic Impairment
Patients with hepatic impairment may require adjustments to their medication regimen to prevent further liver damage or reduced drug metabolism. Certain drugs should be avoided altogether, including paracetamol, carbamazepine, oral contraceptive pills, ergometrine, and anticoagulants or antiplatelets like aspirin or warfarin due to the risk of gastrointestinal bleeding. Other medications, such as opiates, methotrexate, theophylline, and phenytoin, may still be prescribed but at a reduced dose to minimize potential harm to the liver. It is important for healthcare providers to carefully consider the potential risks and benefits of each medication and adjust dosages accordingly for patients with hepatic impairment. Proper medication management can help improve patient outcomes and prevent further liver damage.
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This question is part of the following fields:
- Endocrinology
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Question 16
Incorrect
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An infant is born with ambiguous genitalia, following an uneventful pregnancy and delivery. Upon further investigation, it is discovered that the child has congenital adrenal hyperplasia caused by 21-hydroxylase deficiency.
What is a characteristic of 21-hydroxylase deficiency-related congenital adrenal hyperplasia?Your Answer:
Correct Answer: Adrenocortical insufficiency
Explanation:Understanding the Effects of 21-Hydroxylase Deficiency on Health Conditions
21-hydroxylase deficiency is a medical condition that affects the adrenal glands, resulting in decreased cortisol synthesis and commonly reducing aldosterone synthesis. This condition can lead to adrenal insufficiency, causing salt wasting and hypoglycemia, which may present as symptoms of type II diabetes mellitus. However, it is not associated with diabetes insipidus, which is characterized by low ADH levels.
While 21-hydroxylase deficiency is associated with elevated androgens, it is not a feature of hypogonadism. Instead, patients with this condition may experience stunted growth and may be treated with gonadotrophin-releasing hormone (GnRH). Acromegaly, on the other hand, is not typically associated with 21-hydroxylase deficiency.
Overall, understanding the effects of 21-hydroxylase deficiency on various health conditions can help healthcare professionals provide appropriate treatment and management for affected individuals.
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This question is part of the following fields:
- Endocrinology
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Question 17
Incorrect
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A 35-year-old male is scheduled for his annual diabetic review. During the examination, it is noted that his body mass index has increased to 31.5 kg/m2. How do you calculate body mass index?
Your Answer:
Correct Answer: Weight/(Height)2
Explanation:BMI is a calculation of weight over height squared and is used to determine if someone is underweight, normal weight, overweight, or obese. A BMI above 30 indicates obesity and is associated with increased risks for various health issues and surgical complications.
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This question is part of the following fields:
- Endocrinology
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Question 18
Incorrect
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A 55-year-old man is scheduled for colorectal carcinoma resection and has type 2 diabetes. He is currently well-controlled on 5 mg glibenclamide daily. What is the best pre-operative plan for managing his blood sugar levels?
Your Answer:
Correct Answer: Stop glibenclamide on the morning of surgery and commence insulin by intravenous infusion
Explanation:Management of Glibenclamide in a Patient Undergoing Major Surgery
During major surgery, it is crucial to maintain optimal glycaemic control in patients with diabetes. In the case of a patient taking glibenclamide, the most appropriate course of action is to discontinue the medication on the morning of surgery. Instead, the patient should be started on intravenous (IV) insulin and dextrose with potassium. This approach allows for frequent blood glucose measurements and adjustment of the insulin infusion rate as needed.
By stopping glibenclamide, the risk of hypoglycaemia during surgery is reduced. IV insulin and dextrose with potassium provide a more controlled and predictable method of glycaemic control during the stress of surgery. This approach ensures that the patient’s blood glucose levels remain within a safe range, reducing the risk of complications such as infection, delayed wound healing, and poor surgical outcomes.
In summary, the management of glibenclamide in a patient undergoing major surgery involves discontinuing the medication on the morning of surgery and starting the patient on IV insulin and dextrose with potassium. This approach allows for optimal glycaemic control during the stress of surgery and reduces the risk of complications.
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This question is part of the following fields:
- Endocrinology
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Question 19
Incorrect
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A 25-year-old woman visits her GP complaining of sweating, tremors, and palpitations that have been ongoing for 6 weeks. The patient is currently 7 months pregnant and has no significant medical history. Upon examination, the patient has bulging eyes, a heart rate of 110 bpm, and a small goitre. The following laboratory results were obtained:
- Free T4: 42 pmol/l (normal range: 11-22 pmol/l)
- Free T3: 16 pmol/l (normal range: 3.5-5 pmol/l)
- Thyroid stimulating hormone (TSH): <0.01 µU/l (normal range: 0.17-3.2 µU/l)
- TSH receptor antibody (TRAb): 20 U/l (normal range: <0.9 U/l)
What treatment should be recommended for this patient?Your Answer:
Correct Answer: Carbimazole
Explanation:The patient is showing signs of an overactive thyroid, likely due to Graves’ disease. Propranolol can provide temporary relief, but long-term treatment involves blocking the thyroid gland with carbimazole or replacing thyroid hormones with thyroxine. Ibuprofen is not indicated for this condition. Tri-iodothyronine is more potent than thyroxine but less stable, making thyroxine the preferred hormone replacement medication. Propylthiouracil can also be used to block thyroid hormone formation, but its use in the first trimester of pregnancy is avoided due to potential teratogenic effects. PTU can be used in pregnancy, but only at the lowest effective dose.
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This question is part of the following fields:
- Endocrinology
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Question 20
Incorrect
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A 32-year-old teacher comes to the clinic with a complaint of secondary amenorrhoea lasting for six months. She reports experiencing white discharge from her breasts. Despite taking a home urine pregnancy test, the result was negative. What is the most useful blood test to aid in the diagnosis?
Your Answer:
Correct Answer: Prolactin
Explanation:Prolactinomas: Pituitary Tumours that Affect Hormone Secretion
Prolactinomas are tumours that develop in the pituitary gland and secrete prolactin, a hormone that stimulates milk production in women. These tumours can be either microscopic or macroscopic, with the latter causing mass effects that can lead to headaches, visual disturbances, and other symptoms. In addition to galactorrhoea, prolactinomas can also cause menstrual disturbances, amenorrhoea, and infertility. Some prolactinomas may also co-secrete other pituitary hormones, such as growth hormone, which can further complicate the diagnosis and treatment of the condition.
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This question is part of the following fields:
- Endocrinology
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Question 21
Incorrect
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Which gland produces thyroid stimulating hormone (TSH) in the endocrine system?
Your Answer:
Correct Answer: Anterior pituitary
Explanation:The Thyroid Hormone Axis
The thyroid hormone axis is a complex system that involves the hypothalamus, pituitary gland, and thyroid gland. The hypothalamus produces a hormone called thyrotropin-releasing hormone (TRH), which stimulates the anterior pituitary gland to release thyroid-stimulating hormone (TSH). TSH then stimulates the thyroid gland to produce and release the thyroid hormones thyroxine (T4) and tri-iodothyronine (T3).
Both T4 and T3 are primarily bound to proteins in the bloodstream, but it is the free, unbound hormones that are biologically active. The secretion of TSH is inhibited by the presence of thyroid hormones in the bloodstream. This negative feedback loop helps to regulate the levels of thyroid hormones in the body.
In summary, the thyroid hormone axis is a tightly regulated system that involves multiple hormones and glands working together to maintain proper levels of thyroid hormones in the body.
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This question is part of the following fields:
- Endocrinology
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Question 22
Incorrect
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A 38-year-old patient presents with excessive thirst and abdominal pain.
Bloods show:
Investigation Result Normal value
Calcium (Ca2+) 3.02 mmol/l 2.20–2.60 mmol/l
Phosphate (PO43–) 0.42 mmol/l 0.70–1.40 mmol/l
Alkaline phosphatase (ALP) 324 IU/l 30–130 IU/l
Looking at these blood results, which of the following is the most likely cause?Your Answer:
Correct Answer: Primary hyperparathyroidism
Explanation:Causes and Clinical Presentations of Hyperparathyroidism, Bone Metastases, Excessive Vitamin D, Renal Failure, and Hypoparathyroidism
Hyperparathyroidism is a condition where the parathyroid glands secrete an excessive amount of parathyroid hormone, leading to increased serum calcium levels. This can be caused by a solitary parathyroid adenoma of parathyroid hyperplasia. The clinical presentation includes excessive bone resorption, kidney stone formation, gastrointestinal symptoms, and neurological effects.
Bone metastases also present with hypercalcaemia and a high alkaline phosphatase level, but phosphate levels will be normal. Vitamin D excess can also cause hypercalcaemia with a normal or high phosphate level, but alkaline phosphatase will be normal.
In chronic renal failure, there is a reduction in the excretion of phosphate and a low glomerular filtration rate, leading to secondary hyperparathyroidism with hypocalcaemia and hyperphosphataemia.
Hypoparathyroidism is associated with a decreased production of parathyroid hormone, leading to cramping and paraesthesiae due to low circulating calcium levels. Biochemical abnormalities include low circulating parathyroid hormone and calcium levels, raised phosphate levels, and normal alkaline phosphatase levels.
Overall, understanding the causes and clinical presentations of these conditions is important for accurate diagnosis and appropriate treatment.
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This question is part of the following fields:
- Endocrinology
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Question 23
Incorrect
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A 52-year-old male who works as a truck driver and has been diagnosed with type 2 diabetes for the past 8 years is due for his annual check-up. Despite being on maximum oral hypoglycemic therapy, his HbA1c levels are alarmingly high at 91 mmol/mol (20-42). He has not experienced any hypoglycemic episodes or developed retinopathy. You suggest switching to insulin, but he declines as it would result in him losing his HGV license and having to reapply. The DVLA is aware of his diabetes and current treatment. What is the most appropriate course of action in this scenario?
Your Answer:
Correct Answer: Continue to review patient in clinic and accept that he continues to drive
Explanation:Diabetes and Driving: the Guidelines
When it comes to diabetes and driving, there are certain guidelines that must be followed. In cases where a patient has poor glycaemic control, but no other features that would prevent them from driving, they cannot be forced to switch to insulin or have their driving privileges revoked. However, patients who hold a HGV license and are treated on insulin will initially lose their license and have to re-apply for it.
It’s important to note that regular medical check-ups are necessary for patients who wish to maintain their HGV license. These check-ups should occur every three years to ensure that the patient’s diabetes is under control and that they are fit to drive.
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This question is part of the following fields:
- Endocrinology
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Question 24
Incorrect
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A 46-year-old man with type 1 diabetes for 20 years presents with an ulcer on his right foot. The ulcer is located on the outer aspect of his right big toe and measures 2 cm in diameter. Despite having palpable peripheral pulses, he experiences peripheral neuropathy to the mid shins. The ulcer has an erythematosus margin and is covered by slough. What is the most probable infective organism?
Your Answer:
Correct Answer: Staphylococcus aureus
Explanation:Diabetic foot ulcers can be categorized into neuropathic and ischemic. Infections in diabetic feet are serious and can range from superficial to deep infections and gangrene. Diabetics are more susceptible to foot ulceration due to neuropathy, vascular insufficiency, and reduced neutrophil function. Local signs of wound infection include friable granulation tissue, yellow or grey moist tissue, purulent discharge, and an unpleasant odor. Methicillin-resistant Staphylococcus aureus (MRSA) is more common in previously hospitalized or antibiotic-treated patients. Deep swab and tissue samples should be sent for culture and broad-spectrum antibiotics started if infection is suspected. Urgent surgical intervention is indicated for a large area of infected sloughy tissue, localised fluctuance and expression of pus, crepitus in the soft tissues on radiological examination, and purplish discoloration of the skin. Antibiotic treatment should be tailored according to the clinical response, culture results, and sensitivity. If osteomyelitis is present, surgical resection should be considered, and antibiotics continued for four to six weeks.
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This question is part of the following fields:
- Endocrinology
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Question 25
Incorrect
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A 55-year-old woman is undergoing investigation by her GP for potential issues in her hypothalamic-pituitary-thyroid axis. The following findings were recorded:
Thyroid-stimulating hormone (TSH) 5.2 mu/l (0.4-4.0 mu/l)
fT4 8.0 pmol/l (9.0-26.0 pmol/l)
fT3 3.5 pmol/l (3.0-9.0 pmol/l)
What condition is indicated by these results?Your Answer:
Correct Answer: Hypothyroidism
Explanation:Thyroid Disorders: Understanding the Different Presentations
Thyroid disorders can present with various symptoms and laboratory findings. Here are some of the common presentations of different thyroid disorders:
Hypothyroidism: This condition is characterized by elevated TSH and low fT4 levels. It is more common in females and occurs mainly in middle life. The elevated TSH is due to reduced negative feedback at the level of the pituitary.
Thyroid Hormone Resistance: In this condition, TSH and fT4 levels are raised. Thyroid hormone resistance results in decreased response to a given thyroid hormone, which prompts the thyroid axis to increase TSH and fT4 levels. The patient may not be symptomatic and may even present hypothyroid clinically.
Hyperthyroidism: This condition is characterized by low TSH and usually raised fT4 and fT3 levels.
Pituitary TSH-Secreting Tumour: This condition presents with raised TSH and fT4 levels.
Subclinical Hypothyroidism: This condition presents with elevated TSH but normal fT4 levels.
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This question is part of the following fields:
- Endocrinology
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Question 26
Incorrect
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A 28-year-old woman presents with a three month history of weight gain. During this time her weight has increased from 56 kg to 81 kg.
She works as a teacher and was in a long-term relationship until three months ago. Following the break-up, she started to drink more and her meals became erratic. She has been recently diagnosed with anxiety. In addition, she recently broke her left ankle after falling while hiking.
Her regular medications now include sertraline, vitamin D, and a benzoyl peroxide gel for acne.
What is the next best test?Your Answer:
Correct Answer: Blood for midnight cortisol
Explanation:Screening for Cushing’s Syndrome
This patient is exhibiting symptoms of Cushing’s syndrome, including acne, weight gain, depression, and brittle bones. The most appropriate screening test for this condition is a midnight cortisol level in the blood or a 24-hour urinary free cortisol test. While a dexamethasone suppression test can also be used, a single midnight cortisol level has the same sensitivity and is easier to administer.
It is important to note that morning cortisol levels are more appropriate for diagnosing Addison’s disease. Additionally, while morning cortisol levels are used after a dexamethasone suppression test, the upper limit of normal is not well-defined, unlike the lower limit of normal. Therefore, levels below 550 ng/ml may indicate steroid insufficiency, but high levels cannot provide specific information.
While hypothyroidism may explain some of the patient’s symptoms, a TSH test is not the best option for screening for Cushing’s syndrome. Similarly, while blood sugar levels may be abnormal in this case, they will not aid in diagnosing the cause of the patient’s symptoms. Given the severity of the patient’s symptoms, it is important to take action and screen for Cushing’s syndrome.
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This question is part of the following fields:
- Endocrinology
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Question 27
Incorrect
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A 28-year-old man comes to the clinic complaining of gradual weight loss. He has lost 8 kg over the past three months, and his previous weight was 62 kg.
Two years ago, he volunteered at a child rehabilitation program in India and contracted pulmonary tuberculosis, which was successfully treated. A recent chest x-ray showed no suspicious lesions in the lungs, and there is no lymphadenopathy. He denies having a fever or night sweats.
During the examination, he reveals that he has been drinking one bottle of wine per day for the past three weeks, following a breakup with his girlfriend.
Which test is likely to show a positive result for the weight loss?Your Answer:
Correct Answer: Abdominal x ray
Explanation:Overlooked Causes of Weight Loss: Addison’s Disease
Weight loss can be caused by a variety of factors, and it is important to consider all possibilities when investigating the underlying cause. One often overlooked cause is Addison’s disease, which can occur as a result of past tuberculosis affecting the adrenal glands. This rare condition can be identified through abdominal x-rays, which may show adrenal calcification shadows.
While alcohol abuse can lead to liver damage and hepatitis, it is not likely to be the cause of weight loss in this case. Similarly, steatorrhoea, a manifestation of malabsorption, can cause weight loss, but there are no other indications of malabsorption in this patient’s history.
Thyrotoxicosis, or an overactive thyroid, can also cause weight loss, but it is usually accompanied by other symptoms such as anxiety, tremors, and eye signs. Finally, surreptitious laxative abuse can lead to weight loss, but it is not likely to be the cause in this case given the patient’s history of tuberculosis.
Overall, it is important to consider all possible causes of weight loss, including rare conditions like Addison’s disease, in order to provide the most effective treatment and care for patients.
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This question is part of the following fields:
- Endocrinology
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Question 28
Incorrect
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A 50-year-old woman presents with symptoms of lethargy, weight gain, dry hair and skin, cold intolerance, constipation and low mood. What is the most probable diagnosis?
Your Answer:
Correct Answer: Hypothyroidism
Explanation:Understanding Hypothyroidism and Differential Diagnosis
Hypothyroidism is a condition characterized by a range of symptoms, including lethargy, weight gain, depression, sensitivity to cold, myalgia, dry skin, dry hair and/or hair loss, constipation, menstrual irregularities, carpal tunnel syndrome, memory problems, difficulty concentrating, and myxoedema coma. Diagnosis is made by measuring TSH and T4 levels, with elevated TSH and decreased T4 confirming the diagnosis. Treatment involves titrating doses of levothyroxine until serum TSH normalizes and symptoms resolve. Differential diagnosis includes hypercalcaemia, hyperthyroidism, Addison’s disease, and Cushing’s disease, each with their own unique set of symptoms. Understanding these conditions and their symptoms is crucial for accurate diagnosis and effective treatment.
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This question is part of the following fields:
- Endocrinology
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Question 29
Incorrect
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A 28-year-old woman visited her GP with complaints of low mood, weight gain, and irregular menstrual cycles. The GP conducted some tests and referred her to the hospital. The results of the investigations are as follows:
- Sodium: 150 mmol/l (normal value: 135-145 mmol/l)
- Potassium: 2.5 mmol/l (normal value: 3.5-5.0 mmol/l)
- Fasting blood glucose: 7.7 mmol/l (normal value: <7 mmol/l)
- 24-hour urinary cortisol excretion: 840 nmol/24 h
- Plasma ACTH (0900 h): 132 ng/l (normal value: 0-50 ng/l)
- Dexamethasone suppression test:
- 0800 h serum cortisol after dexamethasone 0.5 mg/6 h orally (po) for two days: 880 nmol/l (<50 nmol/l).
- 0800 h serum cortisol after dexamethasone 2 mg/6 h PO for two days: 875 nmol/l (<50 nmol/l).
What is the most likely diagnosis for this 28-year-old woman?Your Answer:
Correct Answer: Paraneoplastic syndrome secondary to small cell carcinoma of the lung
Explanation:Paraneoplastic Syndrome Secondary to Small Cell Carcinoma of the Lung Causing Cushing Syndrome
Cushing syndrome is a clinical state resulting from chronic glucocorticoid excess and lack of normal feedback mechanisms of the hypothalamo-pituitary-adrenal axis. While Cushing’s disease, paraneoplastic syndrome secondary to small cell carcinoma of the lung, and adrenocortical tumor are specific conditions resulting in Cushing syndrome, this patient’s symptoms are caused by paraneoplastic syndrome secondary to small cell carcinoma of the lung.
In some cases of small cell carcinoma of the lung, ectopic adrenocorticotropic hormone (ACTH) production occurs, leading to elevated plasma ACTH and cortisol levels. The mineralocorticoid activity of cortisol results in sodium retention and potassium excretion, leading to glucose intolerance and hyperglycemia. The differentiation between Cushing’s disease and ectopic ACTH secretion is made by carrying out low- and high-dose dexamethasone suppression tests. In cases of ectopic ACTH secretion, there is usually no response to dexamethasone, as pituitary ACTH secretion is already maximally suppressed by high plasma cortisol levels.
The absence of response to dexamethasone suggests an ectopic source of ACTH production, rather than Cushing’s disease. Other differential diagnoses for Cushing syndrome include adrenal neoplasia, Conn’s syndrome, and premature menopause. However, in this case, the blood test results suggest ectopic production of ACTH, indicating paraneoplastic syndrome secondary to small cell lung carcinoma as the most likely cause.
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This question is part of the following fields:
- Endocrinology
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Question 30
Incorrect
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A 16-year-old female presents with a four-month history of amenorrhoea. During investigations, her GP notes an elevated prolactin concentration of 1500 mU/L (50-550). The patient's mother reports that she had previously experienced regular periods since her menarche at 12 years of age. Physical examination reveals a healthy female with normal pubertal development and no abnormalities in any system. There is no galactorrhoea upon expression. Further investigations show oestradiol levels of 5000 pmol/L (130-800), prolactin levels of 2000 mU/L (50-550), LH levels of 2 U/L (3-10), and FSH levels of 2 U/L (3-15). What test should be requested for this patient?
Your Answer:
Correct Answer: Pregnancy test
Explanation:Pregnancy Hormones
During pregnancy, a woman’s body undergoes significant hormonal changes. One of the key hormones involved is oestradiol, which is produced in large quantities by the placenta. In pregnant women, oestradiol levels can be significantly elevated, which can be confirmed through a pregnancy test. Additionally, pregnant women often have suppressed levels of LH/FSH and elevated levels of prolactin, which helps to produce breast milk. Prolactin levels can increase by 10 to 20 times during pregnancy and remain high if the woman is breastfeeding after the baby is born. It’s important to note that even routine examinations may not detect a pregnancy until later stages, such as 16 weeks. these hormonal changes can help women better prepare for and manage their pregnancies.
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This question is part of the following fields:
- Endocrinology
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SESSION STATS - PERFORMANCE PER SPECIALTY
