Endocrinology Practice Questions

Q: All of the following may be used to treat acute hypercalcemia except?

Gallium nitrate. The management of **acute hypercalcemia** (hypercalcemic crisis) focuses on rapid volume expansion and immediate reduction of serum calcium levels. **Why Gallium Nitrate is the correct answer:** While Gallium nitrate is a potent inhibitor of bone resorption and is FDA-approved for cancer-related hypercalcemia, it is **not used in the acute setting**. Its onset of action is very slow (taking 5–10 days to reach peak effect) and it requires a continuous 5-day intravenous infusion. Furthermore, it is highly nephrotoxic, making it a poor choice compared to modern alternatives. **Analysis of other options:** * **Hydration with Saline (Option A):** This is the **first-line** treatment [1]. Isotonic saline (0.9% NaCl) restores intravascular volume and promotes calciuresis by increasing the glomerular filtration rate and inhibiting proximal tubular sodium-calcium co-transport. * **Calcitonin (Option B):** This is the drug of choice for **rapid** reduction of calcium [2]. It works within 4–6 hours by inhibiting osteoclast activity and increasing renal excretion [2]. However, its effect is limited by *tachyphylaxis* (diminishing effect after 48 hours). * **Bisphosphonates (Option C):** IV bisphosphonates (e.g., Zoledronic acid, Pamidronate) are the most effective agents for sustained control [1]. Though they take 48–72 hours to work, they are standard components of acute management protocols to prevent recurrence. **NEET-PG High-Yield Pearls:** 1. **First step in management:** Aggressive IV hydration (Normal Saline) [1]. 2. **Fastest acting drug:** Calcitonin (useful for the first 48 hours) [2]. 3. **Most potent/Long-term control:** IV Zoledronic acid [1]. 4. **Loop Diuretics (Furosemide):** Should only be used *after* volume status is restored, primarily to prevent fluid overload. 5. **Glucocorticoids:** Preferred treatment for hypercalcemia due to Vitamin D toxicity, Sarcoidosis, or Lymphoma.

Q: What is the most common ophthalmic complication of diabetes mellitus?

Retinopathy. **Explanation:** **1. Why Retinopathy is the Correct Answer:** Diabetic Retinopathy (DR) is the most common microvascular complication of diabetes mellitus and the leading cause of blindness in the working-age population [1]. It occurs due to chronic hyperglycemia leading to basement membrane thickening, pericyte loss, and microaneurysm formation. Epidemiologically, nearly all patients with Type 1 Diabetes and >60% of patients with Type 2 Diabetes will develop some degree of retinopathy after 20 years of disease duration. **2. Analysis of Incorrect Options:** * **B. Cataract:** While diabetics develop cataracts earlier and more frequently (due to sorbitol accumulation in the lens via the polyol pathway), it is less common than the baseline incidence of retinopathy. * **C. Rubeosis iridis:** This refers to neovascularization of the iris. It is a late-stage complication usually secondary to severe proliferative diabetic retinopathy (PDR) and is much rarer than retinopathy itself [1]. * **D. Vitreous hemorrhage:** This is a specific complication of Proliferative Diabetic Retinopathy (PDR) caused by the rupture of fragile new vessels [1]. It is a consequence of advanced disease, not the most common finding. **3. High-Yield Clinical Pearls for NEET-PG:** * **Earliest Clinical Sign:** Microaneurysms (seen as red dots on fundoscopy) [1]. * **Earliest Pathological Sign:** Loss of pericytes and basement membrane thickening. * **Classification:** Divided into Non-Proliferative (NPDR) and Proliferative (PDR). The hallmark of PDR is **Neovascularization** [1]. * **Screening Guidelines:** * Type 1 DM: 5 years after diagnosis. * Type 2 DM: At the time of diagnosis (as the duration of hyperglycemia is often unknown). * **Most common cause of vision loss in DM:** Macular Edema (can occur at any stage of NPDR or PDR) [1].

Q: What is a subtle presentation of hyperparathyroidism?

Asymptomatic hypercalcemia. **Explanation:** Primary Hyperparathyroidism (PHPT) is most commonly caused by a solitary parathyroid adenoma. In the modern era of routine biochemical screening, the clinical profile of the disease has shifted significantly. **Why D is the correct answer:** **Asymptomatic hypercalcemia** is now the most common presentation of PHPT (found in >80% of cases). Most patients are identified incidentally during routine blood tests (e.g., a comprehensive metabolic panel) showing elevated serum calcium and inappropriately high or normal PTH levels. These patients lack the classic "bones, stones, abdominal groans, and psychic moans" and are clinically "subtle" or asymptomatic. **Why other options are incorrect:** * **B (Nephrocalcinosis) & C (Abdominal pain):** These represent the "Stones" and "Groans" of the classic tetrad. Nephrocalcinosis and peptic ulcer disease/pancreatitis are late-stage, overt complications of chronic, severe hypercalcemia, rather than subtle presentations. * **A (Psychiatric manifestation):** Known as "Psychic moans" (depression, fatigue, or confusion), these occur in symptomatic disease. While they can be vague, they are considered part of the established clinical syndrome rather than the most common subtle finding. **NEET-PG High-Yield Pearls:** * **Most common cause:** Solitary Adenoma (85-90%). * **Classic X-ray finding:** Subperiosteal bone resorption (most common in the radial aspect of middle phalanges) and "Salt and pepper" skull. * **Brown Tumors:** Also known as Osteitis Fibrosa Cystica; these are non-neoplastic lesions due to increased osteoclast activity. * **Biochemical Hallmark:** ↑ Serum Calcium, ↓ Serum Phosphate, ↑ PTH, and ↑ Urinary cAMP. * **Hungry Bone Syndrome:** A common post-operative complication after parathyroidectomy characterized by severe hypocalcemia.

Q: Which of the following tests is best for differentiating an ACTH-secreting pituitary tumor from ectopic ACTH production?

High-dose dexamethasone suppression test. ### Explanation The diagnostic approach to Cushing’s syndrome follows a stepwise protocol: first, confirming hypercortisolism, and second, determining the etiology (ACTH-dependent vs. independent) [1]. **Why Option D is Correct:** The **High-Dose Dexamethasone Suppression Test (HDDST)** is used to differentiate between ACTH-dependent causes [3]. Pituitary adenomas (Cushing’s Disease) retain some degree of negative feedback sensitivity. Therefore, a high dose of dexamethasone (8 mg) is sufficient to suppress cortisol levels (usually by >50%). In contrast, **Ectopic ACTH production** (e.g., small cell lung cancer) is autonomous and does not respond to negative feedback, resulting in no cortisol suppression. **Why Other Options are Incorrect:** * **Options A, B, and C:** These are **screening tests** used to establish the diagnosis of Cushing’s syndrome (hypercortisolism) [1]. They cannot differentiate the source of ACTH [2]. * **24-hour Urinary Free Cortisol (UFC):** Measures integrated cortisol excretion [1]. * **Overnight/Low-Dose DST (LDDST):** Demonstrates the loss of normal negative feedback; failure to suppress cortisol confirms Cushing’s syndrome but not the cause [1]. **NEET-PG High-Yield Pearls:** * **Gold Standard:** The most accurate test to differentiate pituitary vs. ectopic ACTH is **Inferior Petrosal Sinus Sampling (IPSS)** with CRH stimulation. * **CRH Stimulation Test:** Pituitary tumors respond with a rise in ACTH/cortisol; ectopic sources do not. * **Imaging:** Once HDDST suggests a pituitary source, an MRI brain is the next step [3]. If it suggests ectopic, CT Chest/Abdomen is indicated. * **Classic Association:** Ectopic ACTH is frequently associated with profound hypokalemia and very high hyperpigmentation compared to Cushing’s disease.

Q: A 31-year-old woman presents with new-onset headaches and elevated blood pressure. She also reports episodic symptoms including palpitations, anxiety, and marked blood pressure elevation. Workup for secondary causes of hypertension reveals elevated urinary free catecholamines. What is the typical cardiovascular involvement in a patient with this systemic disease?

Focal myocardial necrosis. The clinical presentation of episodic hypertension, palpitations, anxiety, and elevated urinary catecholamines is classic for **Pheochromocytoma**. This catecholamine-secreting tumor (usually of the adrenal medulla) leads to significant cardiovascular morbidity. **1. Why Focal Myocardial Necrosis is correct:** Chronic or paroxysmal exposure to high levels of circulating catecholamines (epinephrine and norepinephrine) causes direct toxic effects on the myocardium. This leads to **"Catecholamine Myocarditis,"** characterized by focal myocardial necrosis, mononuclear cell infiltration, and interstitial fibrosis. This damage can manifest as Takotsubo-like cardiomyopathy, arrhythmias, or congestive heart failure. **2. Why the other options are incorrect:** * **Proximal aortitis:** This is typically associated with large-vessel vasculitides like Takayasu arteritis or Syphilis, not catecholamine excess. * **Endothelial plaques:** While hypertension accelerates atherosclerosis (plaque formation), it is a chronic, non-specific process [2]. Focal necrosis is the specific, "typical" pathological hallmark of pheochromocytoma-induced heart disease. * **Systolic scratchy sound:** This refers to a pericardial friction rub (pericarditis) or the Hamman sign (pneumomediastinum). Pheochromocytoma does not typically cause pericardial inflammation. **High-Yield Clinical Pearls for NEET-PG:** * **Rule of 10s:** 10% bilateral, 10% malignant, 10% extra-adrenal (Paraganglioma), 10% pediatric, and 10% familial. * **Diagnosis:** Best initial screening test is **Plasma free metanephrines**; most specific is **24-hour urinary metanephrines** [1]. * **Management:** Always start **Alpha-blockers first** (e.g., Phenoxybenzamine) for 10-14 days before Beta-blockers to avoid a hypertensive crisis (unopposed alpha-stimulation) [1]. * **Associated Syndromes:** MEN 2A, MEN 2B, von Hippel-Lindau (VHL), and NF-1.

Q: Obesity is associated with all of the following except?

Pancreatitis. The correct answer is **Pancreatitis**. While obesity is a major risk factor for several metabolic and mechanical disorders, it is not a direct cause of pancreatitis. However, obesity can indirectly increase the risk of pancreatitis by predisposing individuals to **gallstones** (biliary pancreatitis) or **hypertriglyceridemia**. Furthermore, if pancreatitis occurs in an obese patient, it tends to follow a more severe clinical course with a higher risk of complications, but obesity itself is not listed as a primary etiology in standard classifications. **Analysis of Incorrect Options:** * **Osteoarthritis:** Obesity increases mechanical loading on weight-bearing joints (knees/hips). Additionally, adipose tissue releases pro-inflammatory cytokines (adipokines) that contribute to cartilage degradation [1]. * **Hypertension:** Obesity leads to increased sympathetic nervous system activity, activation of the Renin-Angiotensin-Aldosterone System (RAAS), and physical compression of the kidneys by visceral fat, all of which elevate blood pressure [1]. * **Gallstones:** Obesity increases the hepatic synthesis and biliary secretion of cholesterol, leading to supersaturation of bile and the formation of cholesterol stones. **NEET-PG High-Yield Pearls:** * **Pickwickian Syndrome:** Also known as Obesity Hypoventilation Syndrome; characterized by the triad of obesity, daytime hypercapnia, and sleep-disordered breathing. * **Metabolic Syndrome (ATP III Criteria):** Requires 3 out of 5: Abdominal obesity, High Triglycerides, Low HDL, Hypertension, and High Fasting Glucose [1]. * **Cancer Risk:** Obesity is strongly linked to cancers of the endometrium, breast (post-menopausal), colon, and esophagus (adenocarcinoma).

Q: Syndrome of Inappropriate secretion of Anti-Diuretic hormone (SIADH) may be seen in all of the following conditions except?

Primary pulmonary emphysema. **Explanation:** SIADH is characterized by the excessive release of ADH (Vasopressin) from the posterior pituitary or an ectopic source, leading to water retention, dilutional hyponatremia, and concentrated urine [1]. **Why Primary Pulmonary Emphysema is the Correct Answer:** SIADH is commonly associated with pulmonary pathologies that disrupt normal physiology (like infections or tumors), but **Primary Pulmonary Emphysema** (a form of COPD) is typically **not** a cause. In fact, severe COPD can sometimes lead to compensatory mechanisms that differ from the unregulated water retention seen in SIADH. **Analysis of Incorrect Options:** * **Oat Cell Carcinoma (Small Cell Lung Cancer):** This is the most common cause of ectopic ADH production. The tumor cells directly secrete ADH, making it a classic paraneoplastic syndrome. * **Use of Vincristine:** Several drugs trigger SIADH by either increasing ADH release or enhancing the kidney's sensitivity to it. Vincristine (vinca alkaloid) is a high-yield causative agent, along with Cyclophosphamide and SSRIs. * **Acute Attack of Porphyria:** Acute Intermittent Porphyria (AIP) can cause hypothalamic damage during an attack, leading to the inappropriate release of ADH. **NEET-PG High-Yield Pearls:** 1. **Diagnostic Criteria:** Look for hyponatremia, low serum osmolality ( 100 mOsm/kg) in a **euvolemic** patient [1]. 2. **CNS Causes:** Stroke, trauma, and meningitis are frequent triggers. 3. **Treatment:** Fluid restriction is the first-line treatment. For severe cases, Vaptans (Vasopressin receptor antagonists) or hypertonic saline are used. 4. **Caution:** Rapid correction of hyponatremia can lead to **Osmotic Demyelination Syndrome (Central Pontine Myelinolysis).**

Q: Diabetic neuropathy is a type of:

All of the above. Diabetic neuropathy is a common microvascular complication of diabetes mellitus, resulting from chronic hyperglycemia leading to nerve ischemia and metabolic derangement (polyol pathway). It is not a single entity but a spectrum of disorders affecting different parts of the nervous system [1]. **Explanation of Options:** * **A. Distal Symmetric Sensory Polyneuropathy (DSPN):** This is the most common clinical presentation [1]. It typically follows a "stocking-and-glove" distribution, starting in the toes and progressing proximally. It primarily involves sensory loss and paresthesia. * **B. Mononeuritis:** Diabetes can cause focal nerve damage. This includes cranial mononeuropathies (CN III is most common, typically pupil-sparing) or compression neuropathies like Carpal Tunnel Syndrome [3]. Mononeuritis multiplex can also occur. * **C. Autonomic Neuropathy:** This affects the involuntary nervous system, leading to resting tachycardia, orthostatic hypotension, gastroparesis, diabetic diarrhea, and erectile dysfunction [2]. Since diabetic neuropathy encompasses all these patterns, **Option D (All of the above)** is the correct answer. **High-Yield Clinical Pearls for NEET-PG:** * **Earliest Sign:** Loss of vibration sense (tested with a 128 Hz tuning fork) and loss of ankle jerk reflex [1]. * **Screening:** The 10g Semmes-Weinstein monofilament test is the gold standard for identifying a "foot at risk" for ulceration. * **Cranial Nerve III Palsy:** In diabetes, the pupillary reflex is usually **preserved** because the parasympathetic fibers are peripheral and receive a separate blood supply. * **Treatment:** First-line agents for painful neuropathy include Pregabalin, Duloxetine, or Amitriptyline. Tight glycemic control is the only way to prevent progression.

Question 1

All of the following may be used to treat acute hypercalcemia except?

Accepted Answer

Gallium nitrate

Answer

Hydration with saline

Answer

Calcitonin

Answer

Biphosphonates

Question 2

What is the most common ophthalmic complication of diabetes mellitus?

Accepted Answer

Retinopathy

Answer

Cataract

Answer

Rubeosis iridis

Answer

Vitreous hemorrhage

Question 3

What is a subtle presentation of hyperparathyroidism?

Accepted Answer

Asymptomatic hypercalcemia

Answer

Psychiatric manifestation

Answer

Nephrocalcinosis

Answer

Abdominal pain

Question 4

Which of the following tests is best for differentiating an ACTH-secreting pituitary tumor from ectopic ACTH production?

Accepted Answer

High-dose dexamethasone suppression test

Answer

24-hour urinary free cortisol

Answer

Overnight dexamethasone suppression test

Answer

Low-dose dexamethasone suppression test

Question 5

What is true about diabetic nephropathy?

Accepted Answer

Pancreatic transplantation can improve proteinuria in the early stage.

Answer

Microalbuminuria is not an indicator of long-term cardiovascular morbidity.

Answer

Strict glycemic control cannot prevent microalbuminuria.

Answer

Angiotensin receptor blockers have no additive advantage over other drugs except for blood pressure control.

Question 6

A 31-year-old woman presents with new-onset headaches and elevated blood pressure. She also reports episodic symptoms including palpitations, anxiety, and marked blood pressure elevation. Workup for secondary causes of hypertension reveals elevated urinary free catecholamines. What is the typical cardiovascular involvement in a patient with this systemic disease?

Accepted Answer

Focal myocardial necrosis

Answer

Proximal aortitis

Answer

Endothelial plaques

Answer

Systolic scratchy sound

Question 7

Obesity is associated with all of the following except?

Accepted Answer

Pancreatitis

Answer

Osteoarthritis

Answer

Hypertension

Answer

Gall stones

Question 8

Syndrome of Inappropriate secretion of Anti-Diuretic hormone (SIADH) may be seen in all of the following conditions except?

Accepted Answer

Primary pulmonary emphysema

Answer

Use of vincristine

Answer

Oat cell carcinoma of lung

Answer

Acute attack of porphyria

Question 9

Diabetic neuropathy is a type of:

Accepted Answer

All of the above

Answer

Distal symmetric sensory polyneuropathy

Answer

Mononeuritis

Answer

Autonomic neuropathy

Question 10

If a normal individual receives an insulin injection that lowers plasma glucose to 30 mg/dl, which of the following hormones will NOT be released?

Accepted Answer

Aldosterone

Answer

ACTH

Answer

Epinephrine

Answer

Growth hormone

Endocrinology — MCQs

Endocrinology — MCQs

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