Endocrinology Practice Questions

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

Panhypopituitarism. 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.

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

Hyperpigmentation. 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.

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

Palmar xanthomas. **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].

Q: What are the symptoms of VIPOMA?

Secretory diarrhoea. **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].

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

ACTH stimulation test. 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].

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

Metoclopramide. 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].

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

0.9% saline. **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].

Q: 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?

Increased bone mineral density. 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.

Question 1

All of the following are associated with glucose intolerance except?

Accepted Answer

Panhypopituitarism

Answer

Hyperaldosteronism

Answer

Acromegaly

Answer

Cushing's syndrome

Question 2

Which of the following is NOT seen in ACTH deficiency?

Accepted Answer

Hyperpigmentation

Answer

Weight loss

Answer

Hyponatremia

Answer

Hypoglycemia

Question 3

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

Accepted Answer

Palmar xanthomas

Answer

Triglycerides > 1000 mg/dL

Answer

Subcutaneous extensor tendon xanthomas

Answer

Low serum cholesterol

Question 4

What are the symptoms of VIPOMA?

Accepted Answer

Secretory diarrhoea

Answer

Gall stones

Answer

Fat malabsorption

Answer

Flushing

Question 5

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

Accepted Answer

ACTH stimulation test

Answer

Metyrapone test

Answer

Basal plasma cortisol level

Answer

24-hour urinary 17-ketosteroid

Question 6

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

Accepted Answer

<130/80 mm Hg

Answer

<160/90 mm Hg

Answer

<140/80 mm Hg

Answer

<120/80 mm Hg

Question 7

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

Accepted Answer

Metoclopramide

Answer

Promethazine

Answer

Haloperidol

Answer

Ondansetron

Question 8

Which of the following is true about thyroid storm?

Accepted Answer

Hypotension

Answer

Bradycardia

Answer

Hyperthermia

Answer

Cardiac arrhythmia

Question 9

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

Accepted Answer

0.9% saline

Answer

3% saline

Answer

5% dextrose

Answer

Colloids

Question 10

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?

Accepted Answer

Increased bone mineral density

Answer

Abnormal lipid profile

Answer

Atherosclerosis

Answer

Increased waist-to-hip ratio

Endocrinology — MCQs

Endocrinology — MCQs

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