Endocrinology — MCQs

A 45-year-old male sustained a severe head injury in a road traffic accident. Later, he developed pituitary insufficiency and is being treated with thyroid hormone, testosterone, glucocorticoids, and vasopressin. Which of the following findings would NOT be present in this patient due to growth hormone deficiency?

Endocrinology Indian Medical PG Practice Questions and MCQs

Question 701: All of the following are associated with glucose intolerance except?

A. Hyperaldosteronism
B. Acromegaly
C. Panhypopituitarism (Correct Answer)
D. Cushing's syndrome

Explanation: The correct answer is **Panhypopituitarism**. To understand this, one must distinguish between hormones that are "diabetogenic" (increase blood glucose) and those that maintain glucose levels. **1. Why Panhypopituitarism is the correct answer:** Panhypopituitarism involves a deficiency of multiple anterior pituitary hormones, most notably **Growth Hormone (GH)** and **ACTH** (which leads to secondary cortisol deficiency). Both GH and Cortisol are counter-regulatory hormones that oppose the action of insulin. Their absence leads to **increased insulin sensitivity** and a tendency toward **hypoglycemia**, rather than glucose intolerance [1]. **2. Why the other options are incorrect:** * **Acromegaly (Excess GH):** Growth hormone induces insulin resistance in peripheral tissues and increases hepatic gluconeogenesis, frequently leading to impaired glucose tolerance or "Pituitary Diabetes" [1]. * **Cushing’s Syndrome (Excess Cortisol):** Glucocorticoids stimulate gluconeogenesis and inhibit peripheral glucose uptake. About 80% of patients with Cushing’s exhibit glucose intolerance [3]. * **Hyperaldosteronism:** High levels of aldosterone lead to hypokalemia. **Hypokalemia** inhibits the release of insulin from pancreatic beta cells, thereby causing glucose intolerance. **Clinical Pearls for NEET-PG:** * **The "Diabetogenic" Hormones:** Growth Hormone, Cortisol, Glucagon, and Epinephrine [2]. * **Hypokalemia & Glucose:** Always remember that low potassium impairs insulin secretion. This is why thiazide diuretics can sometimes worsen glycemic control. * **Somatostatinoma:** A rare pancreatic tumor that causes diabetes because somatostatin inhibits the release of both insulin and glucagon.

Question 702: Which of the following is NOT seen in ACTH deficiency?

A. Hyperpigmentation (Correct Answer)
B. Weight loss
C. Hyponatremia
D. Hypoglycemia

Explanation: The correct answer is **Hyperpigmentation**. **1. Why Hyperpigmentation is NOT seen:** Hyperpigmentation is a hallmark of **Primary Adrenal Insufficiency** (Addison’s Disease) [1], not ACTH deficiency (Secondary Adrenal Insufficiency). In primary failure, the lack of cortisol feedback causes a massive compensatory increase in **ACTH** and its precursor, **Pro-opiomelanocortin (POMC)**. POMC is cleaved into ACTH and **Melanocyte-Stimulating Hormone (MSH)**. High levels of MSH/ACTH stimulate melanocytes, leading to skin darkening. In ACTH deficiency, ACTH levels are low or absent; therefore, MSH is not produced, and the skin typically appears pale. **2. Analysis of Incorrect Options:** * **Weight loss:** Cortisol is a catabolic hormone essential for maintaining appetite and metabolic tone. Its deficiency leads to anorexia and significant weight loss. * **Hyponatremia:** While aldosterone is usually normal in secondary insufficiency (as it is regulated by the RAAS, not ACTH) [2], hyponatremia occurs due to the **loss of cortisol's inhibitory effect on ADH**. High ADH levels lead to water retention and dilutional hyponatremia [2]. * **Hypoglycemia:** Cortisol is a counter-regulatory hormone that promotes gluconeogenesis. Its absence impairs glucose production, especially during fasting or stress. **Clinical Pearls for NEET-PG:** * **Mineralocorticoid Sparing:** Unlike Primary Adrenal Insufficiency, ACTH deficiency does **not** cause hyperkalemia because the Renin-Angiotensin-Aldosterone System (RAAS) remains intact [2]. * **The "Alabaster Skin":** Patients with Sheehan’s syndrome or pituitary tumors (ACTH deficiency) often present with a characteristic pale, "alabaster" skin tone. * **Crisis:** Adrenal crisis is generally less severe in secondary vs. primary insufficiency due to preserved aldosterone function.

Question 703: Which of the following is the most characteristic finding for Type III hyperlipoproteinemia?

A. Palmar xanthomas (Correct Answer)
B. Triglycerides > 1000 mg/dL
C. Subcutaneous extensor tendon xanthomas
D. Low serum cholesterol

Explanation: **Explanation:** **Type III Hyperlipoproteinemia**, also known as **Familial Dysbetalipoproteinemia** or Broad Beta Disease [1], is an autosomal recessive disorder caused by a deficiency in **Apolipoprotein E (ApoE)**. Since ApoE is essential for the hepatic uptake of chylomicron remnants and VLDL remnants (IDL), its deficiency leads to the accumulation of these "remnant particles" in the plasma [3]. 1. **Why Option A is correct:** **Palmar xanthomas** (specifically *Xanthoma striatum palmare*) are orange-yellow discolorations or plaques in the creases of the palms and fingers. They are considered **pathognomonic** (highly characteristic) for Type III hyperlipoproteinemia. 2. **Why Option B is incorrect:** While triglycerides are elevated in Type III (usually 300–600 mg/dL), levels >1000 mg/dL are more characteristic of **Type I (Familial Chylomicronemia)** or **Type V** hyperlipidemia, which carry a high risk of acute pancreatitis. 3. **Why Option C is incorrect:** Subcutaneous extensor tendon xanthomas (especially on the Achilles tendon) are the hallmark of **Type IIa (Familial Hypercholesterolemia)**, caused by LDL receptor defects [1]. 4. **Why Option D is incorrect:** In Type III, both serum cholesterol and triglycerides are typically elevated (often in a 1:1 ratio) due to the accumulation of IDL [1]. **High-Yield Clinical Pearls for NEET-PG:** * **Genetics:** Associated with the **ApoE2/E2 genotype** (ApoE2 has low affinity for the LDL receptor). * **Electrophoresis:** Shows a **"Broad Beta Band"** (due to IDL). * **Clinical Presentation:** Patients have a high risk of premature **Peripheral Vascular Disease (PVD)** and Coronary Artery Disease [1]. * **Treatment:** Highly responsive to **Fibrates** and lifestyle modifications [2].

Question 704: What are the symptoms of VIPOMA?

A. Gall stones
B. Secretory diarrhoea (Correct Answer)
C. Fat malabsorption
D. Flushing

Explanation: **Explanation:** **VIPoma** (also known as Verner-Morrison syndrome or WDHA syndrome) is a rare neuroendocrine tumor, usually located in the pancreas, that secretes excessive amounts of **Vasoactive Intestinal Peptide (VIP)** [1]. 1. **Why Secretory Diarrhea is Correct:** VIP stimulates adenylate cyclase in intestinal epithelial cells, increasing cAMP levels. This leads to massive secretion of water and electrolytes (sodium, potassium, and chloride) into the intestinal lumen, inhibiting acid secretion in the stomach [2]. The hallmark is **profuse, watery diarrhea** (often >3 liters/day) that persists even during fasting (secretory type) [2]. 2. **Why Other Options are Incorrect:** * **A. Gallstones:** These are classically associated with **Somatostatinomas** due to the inhibition of cholecystokinin (CCK) release and gallbladder contractility. * **C. Fat Malabsorption (Steatorrhea):** This is more typical of **Zollinger-Ellison Syndrome** (where low pH inactivates pancreatic lipases) or Somatostatinomas, rather than the watery diarrhea of VIPoma. * **D. Flushing:** While VIP can cause vasodilation, episodic flushing is the classic hallmark of **Carcinoid Syndrome** (mediated by serotonin and bradykinins) [1]. **High-Yield Clinical Pearls for NEET-PG:** * **WDHA Syndrome Mnemonic:** **W**atery **D**iarrhea, **H**ypokalemia, **A**chlorhydria (or Hypochlorhydria). * **Metabolic Profile:** Look for **Hyperglycemia** and **Hypercalcemia** in clinical vignettes. * **Diagnosis:** Elevated fasting plasma VIP levels (>75 pg/mL). * **Treatment:** The initial medical management of choice to control diarrhea is **Octreotide** (Somatostatin analog). * **Association:** About 5% of VIPomas are associated with **MEN-1 syndrome** [1].

Question 705: A 25-year-old male presents with weakness, occasional vomiting, hypotension, and skin and mucous membrane pigmentation. The diagnosis can be best established by?

A. Metyrapone test
B. Basal plasma cortisol level
C. 24-hour urinary 17-ketosteroid
D. ACTH stimulation test (Correct Answer)

Explanation: The clinical presentation of weakness, vomiting, hypotension, and **hyperpigmentation** (skin and mucous membranes) is a classic triad for **Primary Adrenocortical Insufficiency (Addison’s Disease)**. The pigmentation occurs because low cortisol levels lead to a compensatory increase in ACTH and its precursor, POMC, which contains Melanocyte-Stimulating Hormone (MSH) sequences [2]. **Why the ACTH Stimulation Test is the Correct Answer:** The **Short Synacthen (ACTH) Stimulation Test** is the gold standard for diagnosing adrenal insufficiency [1]. It assesses the adrenal gland's reserve. In a healthy individual, administering synthetic ACTH (Cosyntropin) should significantly increase serum cortisol. In Addison’s disease, the damaged adrenal cortex fails to respond, resulting in a flat or blunted cortisol response [1]. **Analysis of Incorrect Options:** * **Metyrapone Test:** This blocks 11-beta-hydroxylase and is primarily used to assess the integrity of the entire HPA axis (Secondary insufficiency) or to differentiate causes of Cushing’s syndrome. It is not the first-line diagnostic test for Addison’s. * **Basal Plasma Cortisol:** Cortisol is secreted in a diurnal rhythm and can be low in healthy individuals during the evening. A single random basal level is often non-diagnostic unless it is extremely low (<3 mcg/dL) in the early morning [1]. * **24-hour Urinary 17-ketosteroid:** This measures androgen metabolites and is an outdated, non-specific test with low sensitivity for diagnosing adrenal failure. **Clinical Pearls for NEET-PG:** * **Most common cause:** Autoimmune adrenalitis (Western world); Tuberculosis (Developing countries/India) [2]. * **Electrolyte profile:** Hyponatremia, Hyperkalemia, and Metabolic Acidosis. * **Acute Crisis Management:** Do not wait for tests; treat immediately with IV fluids (Normal Saline) and IV Hydrocortisone [1].

Question 706: What is the goal blood pressure to be maintained in a patient with diabetes mellitus and hypertension?

A. <160/90 mm Hg
B. <130/80 mm Hg (Correct Answer)
C. <140/80 mm Hg
D. <120/80 mm Hg

Explanation: **Explanation:** The management of hypertension in patients with Diabetes Mellitus (DM) is critical because the coexistence of these conditions synergistically increases the risk of atherosclerotic cardiovascular disease (ASCVD), heart failure, and microvascular complications like nephropathy [1]. **Why Option B is Correct:** According to the latest **ADA (American Diabetes Association) 2023/2024 Standards of Care** and the **ACC/AHA guidelines**, the recommended blood pressure goal for all people with diabetes and hypertension is **<130/80 mm Hg** [2]. This lower threshold is targeted to reduce the progression of albuminuria and decrease the risk of stroke and cardiovascular events, provided it can be reached safely without undue treatment burden [1]. **Analysis of Incorrect Options:** * **Option A (<160/90 mm Hg):** This represents Stage 2 hypertension and is far above any therapeutic target; maintaining this level would significantly increase the risk of end-organ damage. * **Option C (<140/80 mm Hg):** This was the older target (ADA 2022 and prior). However, recent evidence (such as the SPRINT trial) suggests that more intensive control (<130/80) provides superior protection against major adverse cardiovascular events (MACE). * **Option D (<120/80 mm Hg):** While "lower is often better," a target of <120/80 is generally not recommended as a standard goal due to the increased risk of adverse effects like electrolyte imbalances, syncope, and acute kidney injury from aggressive polypharmacy. **High-Yield Clinical Pearls for NEET-PG:** * **First-line agents:** ACE inhibitors (e.g., Enalapril) or ARBs (e.g., Losartan) are the drugs of choice, especially if **albuminuria** (UACR ≥30 mg/g) is present, due to their renoprotective effects [2]. * **Initial Therapy:** If BP is ≥150/90 mm Hg, guidelines recommend starting with **two** drugs (e.g., ACEi + Calcium Channel Blocker or Diuretic). * **Monitoring:** Always check serum creatinine and potassium levels within 1–2 weeks of starting an ACE inhibitor or ARB.

Question 707: Which of the following medications is typically avoided in patients with pheochromocytoma due to the risk of hypertensive crisis?

A. Promethazine
B. Metoclopramide (Correct Answer)
C. Haloperidol
D. Ondansetron

Explanation: In patients with **Pheochromocytoma**, certain medications can trigger a life-threatening hypertensive crisis by stimulating the release of catecholamines from the tumor or blocking their reuptake [1]. **Why Metoclopramide is the Correct Answer:** Metoclopramide is a dopamine ($D_2$) receptor antagonist. In the adrenal medulla, dopamine normally exerts an inhibitory effect on catecholamine release. By blocking these inhibitory receptors, metoclopramide causes a sudden, massive release of stored epinephrine and norepinephrine from the pheochromocytoma. Additionally, it may directly stimulate the tumor. This leads to a precipitous rise in blood pressure, making it strictly contraindicated in these patients. **Analysis of Incorrect Options:** * **A. Promethazine:** While it is an antihistamine with some sedative properties, it does not typically trigger catecholamine release. However, phenothiazines as a class are generally used with caution. * **C. Haloperidol:** Although an antipsychotic, it is not the classic trigger associated with hypertensive crisis in this context compared to metoclopramide. * **D. Ondansetron:** This is a $5-HT_3$ receptor antagonist and is considered a safe antiemetic choice for patients with pheochromocytoma. **High-Yield Clinical Pearls for NEET-PG:** * **Drugs to Avoid in Pheochromocytoma:** Metoclopramide, Tricyclic Antidepressants (TCAs), Glucagon (used in provocative tests, now obsolete), Beta-blockers (if given without prior Alpha-blockade), and certain anesthetics like Desflurane. * **The "Rule of 10s":** 10% bilateral, 10% malignant, 10% pediatric, 10% extra-adrenal (Paraganglioma), and 10% familial [1]. * **Management Sequence:** Always **Alpha-blockade first** (e.g., Phenoxybenzamine) for 10–14 days, followed by Beta-blockade to prevent "unopposed alpha stimulation" which causes severe hypertension [1].

Question 708: Which of the following is true about thyroid storm?

A. Bradycardia
B. Hyperthermia
C. Hypotension (Correct Answer)
D. Cardiac arrhythmia

Explanation: Explanation: Thyroid storm is a life-threatening exacerbation of hyperthyroidism characterized by a hypermetabolic state [1]. While the clinical presentation is dominated by sympathetic overactivity, the hemodynamic profile can be complex. **Why Hypotension is the Correct Answer:** In the context of thyroid storm, **hypotension** (Option C) is a critical late-stage finding. While initial stages may show a widened pulse pressure [2], progressive thyroid storm leads to high-output heart failure, profound dehydration (due to vomiting, diarrhea, and diaphoresis), and eventually, cardiovascular collapse [1]. The development of hypotension is a poor prognostic sign indicating impending circulatory failure. **Analysis of Incorrect Options:** * **A. Bradycardia:** This is incorrect. Thyroid storm is classically associated with profound **tachycardia**, often out of proportion to the fever [1]. * **B. Hyperthermia:** While hyperthermia is a hallmark of thyroid storm (often >104°F) [1], the question asks for what is "true" in a specific clinical context. (Note: In many standardized exams, if multiple symptoms are present, the one representing a life-threatening complication or a specific diagnostic criterion like hypotension/shock is prioritized). * **D. Cardiac Arrhythmia:** While arrhythmias (especially Atrial Fibrillation) are very common in thyroid storm [1], hypotension represents the systemic failure of the compensatory mechanisms. **High-Yield Clinical Pearls for NEET-PG:** * **Burch-Wartofsky Point Scale:** Used for diagnosis; scores ≥45 are highly suggestive of thyroid storm. * **Management Sequence (P-I-G):** 1. **P**ropylthiouracil (PTU) – Inhibits T4 to T3 conversion. 2. **I**odine (Lugol’s/SSKI) – Give *after* PTU to prevent the Jod-Basedow effect. 3. **G**lucocorticoids – Inhibit peripheral conversion and treat potential adrenal insufficiency. 4. **Beta-blockers** (Propranolol) – For symptomatic control [1]. * **Aspirin is contraindicated:** It displaces T4 from Thyroid Binding Globulin (TBG), increasing free T4 levels. Use Acetaminophen for fever.

Question 709: A patient presents with Diabetic Ketoacidosis (DKA). What is the initial management?

A. 3% saline
B. 5% dextrose
C. 0.9% saline (Correct Answer)
D. Colloids

Explanation: **Explanation:** The primary goal in the initial management of Diabetic Ketoacidosis (DKA) is the restoration of circulatory volume and the correction of profound dehydration caused by osmotic diuresis [1]. **Why 0.9% Saline is Correct:** Isotonic saline (0.9% NaCl) is the fluid of choice for initial resuscitation [2]. Patients with DKA typically have a fluid deficit of 3–6 liters [1]. 0.9% saline effectively expands the extracellular fluid (ECF) volume, stabilizes blood pressure, and improves renal perfusion, which aids in the clearance of glucose and ketones. **Analysis of Incorrect Options:** * **3% Saline:** This is a hypertonic solution used for symptomatic hyponatremia or cerebral edema. In DKA, it would worsen cellular dehydration and hyperosmolality. * **5% Dextrose:** This is contraindicated as the initial fluid because the patient is already severely hyperglycemic. However, it is added to the regimen later (usually when blood glucose falls below 200–250 mg/dL) to prevent hypoglycemia while insulin continues to suppress ketogenesis [2]. * **Colloids:** These are generally not indicated in DKA unless there is refractory hypovolemic shock. Crystalloids are superior for correcting the total body water deficit. **High-Yield NEET-PG Pearls:** * **The "Rule of 10":** Initial fluid bolus is typically 15–20 mL/kg or roughly 1 liter in the first hour [2]. * **Potassium Management:** Never start insulin if K+ is <3.3 mEq/L. Insulin shifts potassium intracellularly, which can lead to fatal arrhythmias [2]. * **Bicarbonate:** Not routinely recommended unless arterial pH is <6.9. * **Resolution Criteria:** DKA is considered resolved when the anion gap closes (<12 mEq/L) and the patient can tolerate oral intake, not just when glucose levels normalize [3].

Question 710: A 45-year-old male sustained a severe head injury in a road traffic accident. Later, he developed pituitary insufficiency and is being treated with thyroid hormone, testosterone, glucocorticoids, and vasopressin. Which of the following findings would NOT be present in this patient due to growth hormone deficiency?

A. Abnormal lipid profile
B. Atherosclerosis
C. Increased bone mineral density (Correct Answer)
D. Increased waist-to-hip ratio

Explanation: In adults, **Growth Hormone (GH) deficiency** (often part of panhypopituitarism following trauma) leads to a specific metabolic syndrome characterized by body composition changes and increased cardiovascular risk. Head injury is a recognized cause of pituitary hormone deficiency [1]. **Why Option C is the correct answer:** Growth hormone is essential for maintaining bone mass. It stimulates osteoblast activity and the production of IGF-1, which promotes bone formation. Therefore, GH deficiency leads to **decreased bone mineral density (osteopenia/osteoporosis)** and an increased risk of fractures, rather than an increase. **Analysis of Incorrect Options:** * **Option A (Abnormal lipid profile):** GH has lipolytic effects. Its deficiency leads to increased LDL cholesterol and triglycerides, contributing to a pro-atherogenic profile. * **Option B (Atherosclerosis):** Due to the combination of dyslipidemia, increased inflammatory markers (like CRP), and impaired endothelial function, patients with GH deficiency have an accelerated progression of atherosclerosis. * **Option D (Increased waist-to-hip ratio):** GH deficiency causes a shift in body composition, specifically an **increase in visceral/abdominal fat** and a decrease in lean body mass (muscle). This manifests clinically as an increased waist-to-hip ratio. **Clinical Pearls for NEET-PG:** * **Adult GH Deficiency Diagnosis:** The "Gold Standard" test is the **Insulin Tolerance Test (ITT)** (contraindicated in epilepsy/ischemic heart disease). Alternatively, the Glucagon stimulation test is used [1]. * **IGF-1 Levels:** While useful, a normal IGF-1 does not rule out adult GH deficiency; provocative testing is usually required. * **Replacement Therapy:** GH replacement in adults improves lipid profiles, increases exercise capacity, and improves bone density, but must be monitored for side effects like carpal tunnel syndrome and peripheral edema.

Practice by Chapter

Diabetes Mellitus

Practice Questions

Thyroid Disorders

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Adrenal Gland Disorders

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Pituitary Disorders

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Calcium and Bone Metabolism

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Reproductive Endocrinology

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Lipid Disorders

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Endocrine Hypertension

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Multiple Endocrine Neoplasia

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Obesity and Metabolic Syndrome

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Neuroendocrine Tumors

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Endocrine Emergencies

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