Adrenocorticosteroids Indian Medical PG Practice Questions and MCQs
Practice Indian Medical PG questions for Adrenocorticosteroids. These multiple choice questions (MCQs) cover important concepts and help you prepare for your exams.
Adrenocorticosteroids Indian Medical PG Question 1: Escape phenomenon in mineralocorticoid excess occurs due to:
- A. Angiotensin II
- B. Renin
- C. Mineralocorticoid-like action of cortisol
- D. ANP (Atrial Natriuretic Peptide) (Correct Answer)
Adrenocorticosteroids Explanation: ***ANP (Atrial Natriuretic Peptide)***
- The **escape phenomenon** in mineralocorticoid excess is an adaptive mechanism where initial sodium and water retention is followed by a return to near-normal sodium balance, primarily due to increased release of **ANP**.
- **ANP** promotes natriuresis (sodium excretion) and diuresis (water excretion), counteracting the effects of prolonged mineralocorticoid action.
*Angiotensin II*
- **Angiotensin II** stimulates aldosterone secretion and promotes sodium and water reabsorption, directly opposing the "escape" from mineralocorticoid-induced fluid retention.
- Its actions would exacerbate, rather than mitigate, the effects of mineralocorticoid excess.
*Renin*
- In mineralocorticoid excess, high sodium and fluid volume typically **suppress renin secretion**, which would lead to decreased angiotensin II and aldosterone production.
- Suppressed renin is a *consequence* of mineralocorticoid excess, not the mechanism for escape.
*Mineralocorticoid-like action of cortisol*
- While **cortisol** can exert mineralocorticoid effects, especially at high concentrations or in conditions like apparent mineralocorticoid excess, it would perpetuate rather than resolve the issues of sodium and water retention.
- The escape phenomenon describes the body's adaptation *despite* the continued presence of mineralocorticoid activity.
Adrenocorticosteroids Indian Medical PG Question 2: Which of the following is a short-acting glucocorticoid?
- A. Dexamethasone
- B. Hydrocortisone (Correct Answer)
- C. Fludrocortisone
- D. Aldosterone
Adrenocorticosteroids Explanation: ***Hydrocortisone***
- **Hydrocortisone** (Cortisol) is considered a **short-acting glucocorticoid** with a biological half-life of 8-12 hours [1].
- It has both **glucocorticoid** and significant **mineralocorticoid activity**, mimicking the natural adrenal hormone [1], [4].
*Fludrocortisone*
- **Fludrocortisone** is a synthetic corticosteroid with potent **mineralocorticoid activity** and some glucocorticoid effects [2].
- It is used primarily for its **mineralocorticoid effects** in conditions like Addison's disease for salt retention.
*Dexamethasone*
- **Dexamethasone** is a **long-acting glucocorticoid** with a biological half-life of 36-72 hours [1].
- It possesses potent **glucocorticoid activity** but negligible mineralocorticoid effects.
*Aldosterone*
- **Aldosterone** is a **mineralocorticoid hormone** produced by the adrenal glands, not a glucocorticoid [1], [3].
- Its primary role is to regulate **sodium and potassium balance** and blood pressure [3].
Adrenocorticosteroids Indian Medical PG Question 3: Which of the following has the least glucocorticoid activity?
- A. Fludrocortisone
- B. Cortisone (Correct Answer)
- C. Dexamethasone
- D. Betamethasone
Adrenocorticosteroids Explanation: ***Cortisone***
- **Cortisone has the LEAST glucocorticoid activity** among the options listed.
- It is a **prodrug** that must be converted to **hydrocortisone (cortisol)** by 11β-hydroxysteroid dehydrogenase in the liver to become active.
- Its glucocorticoid potency is approximately **0.8** relative to hydrocortisone (when hydrocortisone = 1).
- Due to variable hepatic conversion, it has **lower and less predictable glucocorticoid effects** compared to other agents.
*Fludrocortisone*
- Primarily used for its **potent mineralocorticoid activity** (125× that of hydrocortisone).
- However, it retains **significant glucocorticoid activity** approximately **10-15 times** that of hydrocortisone.
- Despite being marketed as a mineralocorticoid, its glucocorticoid potency is **considerably higher than cortisone**.
*Dexamethasone*
- **Highly potent synthetic glucocorticoid** with negligible mineralocorticoid activity.
- Glucocorticoid potency is approximately **25-30 times** that of hydrocortisone.
- Long duration of action (36-72 hours) and excellent CNS penetration.
*Betamethasone*
- **Highly potent synthetic glucocorticoid**, structurally similar to dexamethasone (differs only in stereochemistry at C-16).
- Glucocorticoid potency is approximately **25-30 times** that of hydrocortisone.
- Minimal mineralocorticoid activity, with similar clinical applications to dexamethasone.
Adrenocorticosteroids Indian Medical PG Question 4: What is the primary mechanism by which steroids exert their anti-inflammatory action?
- A. Phospholipase A2 (Correct Answer)
- B. Myeloperoxidase
- C. Cyclooxygenase
- D. Lipoxygenase
Adrenocorticosteroids Explanation: ***Phospholipase A2***
- Steroids exert their primary anti-inflammatory action by inducing the synthesis of **lipocortin-1 (annexin-1)**, which then inhibits **phospholipase A2 (PLA2)**, an enzyme crucial for the release of **arachidonic acid** from cell membrane phospholipids.
- By blocking PLA2, steroids prevent the formation of all subsequent inflammatory mediators derived from arachidonic acid, including **prostaglandins**, **leukotrienes**, and **thromboxanes**.
- This represents the most **upstream** mechanism of steroid anti-inflammatory action, affecting multiple downstream pathways simultaneously.
*Cyclooxygenase*
- **Cyclooxygenase (COX)** enzymes, specifically COX-1 and COX-2, are responsible for converting arachidonic acid into **prostaglandins** and **thromboxanes**.
- While steroids ultimately reduce COX activity by limiting substrate availability, their direct and primary inhibition is not on COX itself but at an earlier step in the inflammatory cascade.
*Lipoxygenase*
- The **lipoxygenase (LOX)** pathway converts arachidonic acid into **leukotrienes**, which are potent mediators of inflammation, particularly in asthma and allergic reactions.
- Steroids do inhibit the formation of leukotrienes indirectly by blocking their precursor, arachidonic acid, but their direct target is not LOX itself.
*Myeloperoxidase*
- **Myeloperoxidase** is an enzyme found primarily in **neutrophils** and macrophages, playing a role in oxidative stress and microbial killing by producing hypochlorous acid (bleach).
- While steroids can modulate immune cell function, their direct anti-inflammatory mechanism is not through the inhibition of myeloperoxidase activity.
Adrenocorticosteroids Indian Medical PG Question 5: Which of the following is the drug of choice for Addison's disease?
- A. Hydrocortisone (Correct Answer)
- B. Betamethasone
- C. Dexamethasone
- D. Prednisolone
Adrenocorticosteroids Explanation: ***Hydrocortisone***
- **Hydrocortisone** is the **glucocorticoid of choice** for Addison's disease because it most closely mimics the body's natural cortisol in terms of **potency and duration of action**.
- It is preferred for **physiological replacement therapy** due to its short half-life (8-12 hours), allowing for dosing schedules that mimic the normal circadian rhythm of cortisol secretion.
- While hydrocortisone has **some mineralocorticoid activity**, it is usually **combined with fludrocortisone** (a synthetic mineralocorticoid) to provide complete hormone replacement in Addison's disease.
- The typical regimen is hydrocortisone **15-25 mg/day in divided doses** plus fludrocortisone **0.05-0.2 mg/day**.
*Betamethasone*
- **Betamethasone** is a **potent long-acting synthetic glucocorticoid** with **minimal mineralocorticoid activity**.
- Its **long duration of action** and high potency make it unsuitable for daily physiological replacement therapy, as it increases the risk of **cushingoid side effects** and cannot mimic normal cortisol circadian rhythm.
*Dexamethasone*
- **Dexamethasone** is a **very potent long-acting glucocorticoid** with **no mineralocorticoid activity**.
- Its **very long half-life (36-72 hours)** makes precise titration for physiological replacement extremely difficult and increases the risk of **overreplacement and cushingoid features**.
- It is not suitable for routine replacement therapy in Addison's disease.
*Prednisolone*
- **Prednisolone** is an intermediate-acting glucocorticoid that can be used as an **alternative to hydrocortisone** for replacement therapy.
- However, **hydrocortisone remains preferred** because its pharmacokinetic profile more closely matches physiological cortisol secretion.
- Like hydrocortisone, prednisolone also requires **supplementation with fludrocortisone** for complete mineralocorticoid replacement.
Adrenocorticosteroids Indian Medical PG Question 6: A patient on long-term high-dose steroid therapy (prednisolone 20 mg/day for 6 months) is scheduled for major abdominal surgery. What is the most essential perioperative requirement?
- A. Insulin only
- B. Hydrocortisone only (Correct Answer)
- C. Both
- D. None of the options
Adrenocorticosteroids Explanation: ***Hydrocortisone only***
- Patients on chronic **high-dose steroid therapy** (>5 mg prednisolone daily for >3 weeks) are at risk of **adrenal insufficiency** during surgical stress due to suppression of the hypothalamic-pituitary-adrenal (HPA) axis.
- **Hydrocortisone stress dose** (100 mg IV at induction, followed by 50 mg every 8 hours) is the **most essential and immediate requirement** to prevent **adrenal crisis** during major surgery.
- Hydrocortisone has both glucocorticoid and mineralocorticoid activity, mimicking the body's natural cortisol response to surgical stress.
*Insulin only*
- While steroids can cause **hyperglycemia** requiring insulin management, this is a **secondary concern** compared to preventing life-threatening **adrenal crisis**.
- Insulin addresses a metabolic complication but does not protect against **inadequate cortisol response** to surgical stress.
- **Without stress-dose steroids**, the patient risks hemodynamic collapse regardless of glucose control.
*Both*
- Although **both** medications might eventually be needed if hyperglycemia develops, the question asks for the **most essential** requirement.
- **Hydrocortisone is non-negotiable** and must be given prophylactically; insulin is only needed if blood glucose is elevated.
- Prioritizing both equally misses the critical time-sensitive need for **adrenal axis support**.
*None of the options*
- This is incorrect because patients on chronic high-dose steroids undergoing major surgery **absolutely require stress-dose steroid coverage**.
- Failure to administer hydrocortisone can result in **acute adrenal crisis** with severe hypotension, shock, and potential mortality.
- Modern guidelines confirm the need for perioperative steroid supplementation in high-risk patients.
Adrenocorticosteroids Indian Medical PG Question 7: A 42-year old man with history of alcohol dependency presents with progressive abdominal distension. Abdominal examination reveals a shifting dullness. Which one of the following is the most appropriate drug to relieve this abdominal distension?
- A. Lactulose
- B. Spironolactone (Correct Answer)
- C. Propranolol
- D. Octreotide
Adrenocorticosteroids Explanation: **Spironolactone**
- **Spironolactone** is an **aldosterone antagonist**, which is the **first-line diuretic** used in the management of **ascites** due to **cirrhosis**, often developing secondary to alcohol dependency.
- It works by blocking aldosterone receptors in the **renal collecting duct**, leading to increased sodium and water excretion while conserving potassium, effectively reducing fluid accumulation.
*Lactulose*
- **Lactulose** is a non-absorbable disaccharide primarily used to treat and prevent **hepatic encephalopathy** by reducing ammonia levels.
- It does not directly relieve abdominal distension caused by ascites, and its use is unrelated to fluid overload.
*Propranolol*
- **Propranolol** is a **non-selective beta-blocker** used to reduce **portal pressure** and prevent **variceal bleeding** in patients with cirrhosis.
- While it addresses a complication of chronic liver disease, it does not directly manage or relieve ascites.
*Octreotide*
- **Octreotide** is a **somatostatin analog** used to treat complications like **acute variceal bleeding** or **hepatic encephalopathy** by reducing splanchnic blood inflow.
- It is not indicated for the management of ascites or relief of abdominal distension caused by fluid accumulation.
Adrenocorticosteroids Indian Medical PG Question 8: Which of the following potassium-sparing diuretics was the first to be shown to reduce cardiac mortality in chronic heart failure patients?
- A. Spironolactone (Correct Answer)
- B. Amiloride
- C. Triamterene
- D. Eplerenone
Adrenocorticosteroids Explanation: ***Spironolactone***
- **Spironolactone** was the first potassium-sparing diuretic shown to reduce **cardiac mortality** in patients with **chronic heart failure** in the **RALES trial** (Randomized Aldactone Evaluation Study).
- Its beneficial effects in heart failure are primarily attributed to its **aldosterone receptor antagonist** properties, which counteract the harmful effects of aldosterone on the myocardium and vasculature, rather than just its diuretic effect.
*Amiloride*
- **Amiloride** is a potassium-sparing diuretic that works by directly inhibiting **epithelial sodium channels (ENaC)** in the collecting duct.
- While it helps in potassium conservation, it has not been shown to significantly reduce cardiac mortality in chronic heart failure patients in clinical trials.
*Triamterene*
- **Triamterene** is another potassium-sparing diuretic that also directly inhibits **ENaC** in the collecting duct, similar to amiloride.
- Like amiloride, it is used to prevent hypokalemia but lacks evidence for significant **cardiac mortality reduction** in chronic heart failure.
*Eplerenone*
- **Eplerenone** is a selective **aldosterone receptor antagonist**, similar to spironolactone, with fewer hormonal side effects.
- While it has been shown to reduce **cardiac mortality** in chronic heart failure (e.g., in the EMPHASIS-HF trial), it was introduced later than spironolactone and was not the *first* to demonstrate this benefit.
Adrenocorticosteroids Indian Medical PG Question 9: Which of the following steroids possesses maximum glucocorticoid activity?
- A. Prednisolone
- B. Aldosterone
- C. Dexamethasone (Correct Answer)
- D. Cortisol
Adrenocorticosteroids Explanation: ***Dexamethasone***
- **Dexamethasone** is a synthetic glucocorticoid with high potency, making it one of the steroids with the **maximum glucocorticoid activity** [1], [2].
- It exhibits a much longer duration of action and significantly greater anti-inflammatory effects compared to natural glucocorticoids like cortisol [2].
*Prednisolone*
- **Prednisolone** is a synthetic glucocorticoid that has approximately four times the anti-inflammatory potency of cortisol [1].
- While potent, it does not reach the glucocorticoid activity levels of dexamethasone.
*Cortisol*
- **Cortisol** is the body's primary natural glucocorticoid, involved in stress response and metabolism [2].
- Its glucocorticoid activity serves as a baseline for comparing the potencies of other synthetic corticosteroids [2].
*Aldosterone*
- **Aldosterone** is primarily a mineralocorticoid, not a glucocorticoid, with its main role being the regulation of electrolyte and water balance [2].
- It possesses minimal to no glucocorticoid activity.
Adrenocorticosteroids Indian Medical PG Question 10: Preferred first-line drug for infantile spasms is –
- A. ACTH
- B. Ethosuximide
- C. Vigabatrin (Correct Answer)
- D. Carbamazepine
Adrenocorticosteroids Explanation: ***Vigabatrin***
- **Vigabatrin** is considered the preferred first-line treatment for infantile spasms, particularly effective for both **cryptogenic** and **symptomatic** cases, and especially for cases associated with **tuberous sclerosis complex (TSC)**.
- It works by irreversibly inhibiting **GABA transaminase**, increasing GABA levels in the brain, thereby suppressing seizures with fewer long-term side effects compared to ACTH.
*ACTH*
- **ACTH** is also an effective first-line treatment for infantile spasms and may be preferred in certain clinical scenarios or when vigabatrin is **contraindicated** or **unavailable**.
- Its mechanism of action is not fully understood but may involve **steroid receptors**, suppression of inflammatory cytokines, and modulation of neuronal excitability.
*Ethosuximide*
- **Ethosuximide** is the drug of choice for **absence seizures** (petit mal seizures), not infantile spasms.
- It acts by blocking **T-type calcium channels** in the thalamus, which are crucial for the generation of absence seizures.
*Carbamazepine*
- **Carbamazepine** is primarily used for **focal (partial) seizures** and **tonic-clonic seizures**, not infantile spasms.
- It works by blocking **voltage-gated sodium channels**, stabilizing inactivated states and preventing repetitive neuronal firing.
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