Antihypertensive Agents — MCQs
The choice of antihypertensive medication also depends upon the co-morbid illness of the patient, and all of the following recommendations have been made except:
Side effects of thiazide diuretics include all of the following except?
What is the cause of cough and angioedema in a patient receiving ACE inhibitors?
Which of the following medications is most likely to cause reflex tachycardia?
Which of the following drugs decreases plasma renin activity
Thiazides and loop diuretics both have opposite action on which of the following ions ?
Plasma Renin activity is lowered by which of the following group of drugs?
Which of the following is not a contraindication for neuraxial block?
Coronary steal syndrome is associated with
A 30-year-old male chronic smoker presents with this condition. Which of the following drugs is the preferred drug for improving circulation?
Antihypertensive Agents Indian Medical PG Practice Questions and MCQs
Question 1: The choice of antihypertensive medication also depends upon the co-morbid illness of the patient, and all of the following recommendations have been made except:
- A. In hypertensive patients with gout, diuretics are the first-line treatment. (Correct Answer)
- B. In hypertensive patients with heart failure, ACE inhibitors may be preferred
- C. In hypertensive patients with migraine, beta blockers are an excellent choice
- D. In hypertensive patients with peripheral vascular disease, calcium channel blockers are recommended
Explanation: ***In hypertensive patients with gout, diuretics are the first-line treatment.*** * This statement is incorrect because **diuretics**, particularly **thiazide diuretics**, can **elevate uric acid levels** and precipitate or worsen gout attacks. * Therefore, they are generally **contraindicated or used with caution** in patients with gout, not recommended as first-line treatment. *In hypertensive patients with heart failure, ACE inhibitors may be preferred* * **ACE inhibitors** are a cornerstone of heart failure treatment due to their ability to **improve cardiac remodeling**, reduce mortality, and alleviate symptoms. * They are often preferred for their **vasodilatory effects** and ability to prevent volume overload, which benefits patients with heart failure. *In hypertensive patients with migraine, beta blockers are an excellent choice* * **Beta-blockers**, such as propranolol, are effective in both **blood pressure control** and the **prophylaxis of migraines** [1]. * This makes them an excellent choice for a hypertensive patient who also suffers from migraines, offering a dual therapeutic benefit [1]. *In hypertensive patients with peripheral vascular disease, calcium channel blockers are recommended* * **Calcium channel blockers (CCBs)**, especially dihydropyridines like amlodipine, are beneficial in peripheral vascular disease (PVD) due to their **vasodilatory effects**. * They can **improve blood flow** to the extremities, which is crucial in PVD, without negatively impacting symptoms like claudication.
Question 2: Side effects of thiazide diuretics include all of the following except?
- A. Hypokalemia
- B. Erectile dysfunction
- C. Hyponatremia
- D. Hypocalcemia (Correct Answer)
Explanation: ***Hypocalcemia*** - Thiazide diuretics are known to cause **hypercalcemia** (increased calcium reabsorption), NOT hypocalcemia, due to their action on the distal convoluted tubule. - This property makes them useful in treating conditions like **idiopathic hypercalciuria** and **calcium-containing kidney stones**. - The mechanism involves enhanced passive calcium reabsorption in the proximal tubule and active reabsorption in the distal tubule. *Hyponatremia* - Thiazide diuretics impair the kidney's ability to dilute urine and reabsorb sodium in the distal tubule, leading to **increased sodium excretion** and potential hyponatremia. - This effect is more pronounced in **elderly patients** and those with increased free water intake. - Hyponatremia is one of the most common electrolyte disturbances with thiazides. *Hypokalemia* - Thiazides increase the delivery of sodium and water to the collecting duct, leading to increased activity of the **renin-angiotensin-aldosterone system** and enhanced potassium secretion. - This results in **potassium wasting** and hypokalemia, which may require potassium supplementation or combination with potassium-sparing diuretics. *Erectile dysfunction* - Thiazide diuretics can cause **erectile dysfunction** through mechanisms including effects on vascular smooth muscle, reduced blood flow, and possible hormonal effects. - This is a common side effect reported in male patients using these medications for hypertension and may affect compliance.
Question 3: What is the cause of cough and angioedema in a patient receiving ACE inhibitors?
- A. Bradykinin
- B. Increased renin levels
- C. Increased angiotensin-II levels
- D. Bradykinin accumulation (Correct Answer)
Explanation: ***Bradykinin accumulation*** - **ACE inhibitors** block the enzyme **angiotensin-converting enzyme (ACE)**, which is responsible for degrading **bradykinin**. - The resulting **accumulation of bradykinin** is a potent vasodilator and increases capillary permeability, leading to **cough** (5-20% of patients) and **angioedema** (0.1-0.7%). - This is the most **precise answer** as it specifies the mechanism: impaired degradation leading to accumulation. *Bradykinin (alone)* - While **bradykinin** is the mediator involved, this option is **less precise** than "bradykinin accumulation." - **Bradykinin** is naturally present in the body; the problem with ACE inhibitors is specifically the **accumulation** due to impaired degradation. - The correct answer requires understanding that it's the **excess levels**, not just the presence, that causes symptoms. *Increased renin levels* - **ACE inhibitors** block the conversion of **angiotensin I to angiotensin II**, leading to reduced negative feedback. - This causes **compensatory increase in renin secretion** from the juxtaglomerular apparatus. - However, increased renin is **not responsible** for cough or angioedema—these are bradykinin-mediated effects. *Increased angiotensin-II levels* - **ACE inhibitors** actually **decrease angiotensin-II levels**, which is their primary **antihypertensive mechanism**. - This option is **incorrect** as ACE inhibitors reduce (not increase) angiotensin-II. - The reduction in angiotensin-II does not cause cough or angioedema.
Question 4: Which of the following medications is most likely to cause reflex tachycardia?
- A. Nifedipine (Correct Answer)
- B. Verapamil
- C. Propranolol
- D. Amlodipine
Explanation: ***Nifedipine*** - Nifedipine is a **dihydropyridine calcium channel blocker** that causes significant peripheral vasodilation, leading to a rapid drop in blood pressure. - This sudden drop in blood pressure triggers a **baroreflex response**, compensatory increase in heart rate. *Verapamil* - Verapamil is a **non-dihydropyridine calcium channel blocker** that primarily acts on the cardiac pacemaker cells and slows AV nodal conduction. - While it can cause vasodilation, its direct negative chronotropic effect on the heart often **blunts or prevents reflex tachycardia**. *Propranolol* - Propranolol is a **non-selective beta-blocker** that blocks beta-1 and beta-2 adrenergic receptors. - It directly **decreases heart rate and myocardial contractility**, thereby preventing reflex tachycardia. *Amlodipine* - Amlodipine is a **dihydropyridine calcium channel blocker**, similar to nifedipine, but it has a **slower onset of action and a longer half-life**. - Its more gradual onset of vasodilation often results in a significantly **less pronounced or absent reflex tachycardia** compared to nifedipine.
Question 5: Which of the following drugs decreases plasma renin activity
- A. Nifedipine
- B. Hydralazine
- C. Enalapril
- D. Clonidine (Correct Answer)
Explanation: ***Clonidine*** - **Clonidine** is a centrally acting alpha-2 adrenergic agonist that reduces **sympathetic outflow** from the brainstem. - This reduction in sympathetic activity leads to decreased release of **norepinephrine**, which in turn reduces renin secretion by the kidneys. *Nifedipine* - **Nifedipine** is a **dihydropyridine calcium channel blocker** that causes peripheral vasodilation. - The vasodilation often leads to a **reflex increase in sympathetic activity** and, consequently, an increase in plasma renin activity. *Hydralazine* - **Hydralazine** is a direct systemic **vasodilator** that decreases peripheral vascular resistance. - This vasodilation can cause a **reflex increase in sympathetic activity** and **renin release** as the body tries to compensate for the drop in blood pressure. *Enalapril* - **Enalapril** is an **ACE inhibitor** that blocks the conversion of angiotensin I to angiotensin II. - This action directly leads to **increased plasma renin activity** due to the disruption of the negative feedback loop on renin release.
Question 6: Thiazides and loop diuretics both have opposite action on which of the following ions ?
- A. Potassium
- B. Sodium
- C. Chloride
- D. Calcium (Correct Answer)
Explanation: ***Calcium*** - Thiazide diuretics **increase calcium reabsorption** in the distal convoluted tubule, leading to decreased urinary calcium excretion. - Loop diuretics **decrease calcium reabsorption** in the thick ascending limb of the loop of Henle, resulting in increased urinary calcium excretion. *Potassium* - Both thiazide and loop diuretics can cause **hypokalemia** by increasing potassium excretion in the urine. - This is due to increased sodium delivery to the collecting duct, which stimulates potassium secretion. *Sodium* - Both thiazide and loop diuretics inhibit sodium reabsorption at different sites in the nephron, leading to **increased urinary sodium excretion** (natriuresis). - This is their primary mechanism of action for diuresis. *Chloride* - Both thiazide and loop diuretics inhibit **chloride reabsorption** as they block specific sodium-chloride cotransporters. - Thiazides inhibit the Na-Cl cotransporter in the DCT, while loop diuretics inhibit the Na-K-2Cl cotransporter in the thick ascending limb.
Question 7: Plasma Renin activity is lowered by which of the following group of drugs?
- A. Arteriolar dilators
- B. Alpha 2 agonists (Correct Answer)
- C. Calcium channel blockers
- D. ACE inhibitors
Explanation: ***Alpha 2 agonists*** - **Alpha-2 agonists** (e.g., clonidine) work by stimulating central alpha-2 adrenergic receptors, which reduces **sympathetic outflow** from the CNS. - This reduction in sympathetic tone decreases **renin release** from the juxtaglomerular cells in the kidney, thereby lowering plasma renin activity. *Arteriolar dilators* - **Arteriolar dilators** (e.g., hydralazine, minoxidil) decrease peripheral vascular resistance and lower blood pressure. - This reduction in blood pressure and renal perfusion can activate the **renin-angiotensin-aldosterone system (RAAS)**, leading to an **increase** in plasma renin activity as a compensatory mechanism. *Calcium channel blockers* - **Calcium channel blockers** (e.g., nifedipine, amlodipine) directly relax vascular smooth muscle and reduce peripheral resistance. - Some calcium channel blockers, particularly **dihydropyridines**, can cause reflex sympathetic activation due to vasodilation, potentially **increasing** renin release. *ACE inhibitors* - **ACE inhibitors** (e.g., enalapril, lisinopril) block the conversion of angiotensin I to angiotensin II. - By inhibiting the negative feedback that angiotensin II typically exerts on renin release, ACE inhibitors actually lead to an **increase** in plasma renin activity.
Question 8: Which of the following is not a contraindication for neuraxial block?
- A. Patient on clopidogrel
- B. Patient on antihypertensive medication (Correct Answer)
- C. Local infection
- D. Platelet count < 50,000
Explanation: ***Patient on antihypertensive medication*** - Antihypertensive medications are generally **not a contraindication** for neuraxial block; however, careful management of **blood pressure** especially following the sympathetic block is essential. - The primary concern is **hypotension** due to the sympathetic blockade, which can be managed with fluids and vasopressors, not an absolute contraindication. *Patient on clopidogrel* - **Clopidogrel** is an **antiplatelet agent** that increases the risk of **spinal hematoma** if a neuraxial block is performed. - This medication should typically be discontinued for a specific period before neuraxial procedures to minimize bleeding risk. *Local infection* - Performing a neuraxial block through an infected area increases the risk of introducing **pathogens into the subarachnial space**, leading to severe complications like **meningitis** or an **epidural abscess**. - This is an **absolute contraindication** to protect against central nervous system infection. *Platelet count < 50,000* - A **low platelet count** indicates impaired hemostasis, significantly increasing the risk of **bleeding** and the formation of a **spinal hematoma** following neuraxial puncture. - While exact thresholds vary, a platelet count below 50,000 is generally considered an **absolute contraindication** for neuraxial anesthesia.
Question 9: Coronary steal syndrome is associated with
- A. Sevoflurane
- B. Halothane
- C. Isoflurane (Correct Answer)
- D. Desflurane
Explanation: ***Isoflurane*** - **Isoflurane** is a potent coronary vasodilator which can cause coronary steal syndrome in patients with existing **coronary artery disease**. - It preferentially dilates normal coronary arteries, diverting blood flow away from stenotic areas, potentially worsening **myocardial ischemia**. *Sevoflurane* - **Sevoflurane** is also a vasodilator but is generally considered to have a lower risk of coronary steal compared to isoflurane. - Its vasodilatory effects are less pronounced in diseased arteries, making it a safer option for patients with **ischemic heart disease**. *Halothane* - **Halothane** is known for myocardial depression and arrhythmias, but its coronary dilating properties are less pronounced and it is infrequently associated with coronary steal. - It is an older inhalational anesthetic that has largely been replaced due to its side effect profile, including potential **hepatotoxicity**. *Desflurane* - **Desflurane** is a potent vasodilator, similar to isoflurane, but it typically causes peripheral vasodilation rather than significant coronary steal. - Its rapid onset and offset are beneficial, but it can cause **tachycardia** and **hypertension** with rapid increases in concentration.
Question 10: A 30-year-old male chronic smoker presents with this condition. Which of the following drugs is the preferred drug for improving circulation?
- A. Prasugrel
- B. Naftidrofuryl
- C. Cilostazol (Correct Answer)
- D. Xanthine nicotinate
Explanation: ***Cilostazol*** - The image shows **gangrenous toes** in a **chronic smoker**, suggesting peripheral arterial disease (PAD) or Buerger's disease (thromboangiitis obliterans), which is typically seen in young to middle-aged males who are heavy smokers and presents with limb ischemia. - **Cilostazol** is a phosphodiesterase-3 inhibitor that inhibits platelet aggregation and is a direct arterial vasodilator, making it the preferred drug for improving **claudication** and circulation in PAD. *Prasugrel* - **Prasugrel** is an antiplatelet drug used primarily in acute coronary syndromes undergoing percutaneous coronary intervention (PCI) to reduce thrombotic events. - While it reduces platelet aggregation, it does not directly improve peripheral circulation or symptoms of claudication as effectively as cilostazol in PAD. *Naftidrofuryl* - **Naftidrofuryl** is a peripheral vasodilator and serotonin 5-HT2 receptor antagonist used primarily for treating intermittent claudication and has some evidence for improving pain-free walking distance. - However, it is generally considered a second-line agent, and its efficacy is often less pronounced than cilostazol, particularly in severe cases of peripheral ischemia. *Xanthine nicotinate* - **Xanthine nicotinate** is a derivative of nicotinic acid with vasodilator properties, sometimes used to improve circulation in peripheral vascular disease. - Its efficacy in severe peripheral ischemia or symptomatic claudication is generally considered limited compared to other agents like cilostazol, and it is not typically a preferred first-line treatment.
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