Cardiovascular pharmacology Practice Questions
20 free Cardiovascular pharmacology practice questions for the USMLE Step 1. Tap an option to answer — you get instant feedback, the correct answer, and a detailed explanation for every question.
Which drug class lowers blood pressure primarily by inhibiting the conversion of angiotensin I to angiotensin II and increasing bradykinin levels?
- A Calcium channel blockers
- B Beta-blockers
- C ACE inhibitors
- D Thiazide diuretics
Correct answer: ACE inhibitors
ACE inhibitors block angiotensin-converting enzyme, reducing angiotensin II formation and preventing bradykinin breakdown. This causes vasodilation and lowers BP.
Which antihypertensive drug reduces cardiac output by blocking β₁-adrenergic receptors, thereby decreasing heart rate and contractility?
- A Losartan
- B Bisoprolol
- C Amlodipine
- D Hydrochlorothiazide
Correct answer: Bisoprolol
Bisoprolol is a β₁-selective blocker that reduces catecholamine-mediated heart rate and contractility. This lowers cardiac output and blood pressure.
Which class of antihypertensive drugs works by blocking L-type calcium channels in vascular smooth muscle to reduce peripheral resistance?
- A ACE inhibitors
- B Calcium channel blockers
- C Beta-blockers
- D Loop diuretics
Correct answer: Calcium channel blockers
Calcium channel blockers inhibit voltage-gated L-type calcium channels in vascular smooth muscle, causing vasodilation and reduced systemic vascular resistance.
Which diuretic acts on the distal convoluted tubule by inhibiting the Na⁺/Cl⁻ cotransporter, leading to lowered blood pressure?
- A Furosemide
- B Spironolactone
- C Chlorthalidone
- D Mannitol
Correct answer: Chlorthalidone
Chlorthalidone, a thiazide-like diuretic, inhibits the Na⁺/Cl⁻ cotransporter in the distal convoluted tubule, promoting natriuresis and lowering BP.
Why are angiotensin II receptor blockers (ARBs) sometimes used instead of ACE inhibitors?
- A They raise bradykinin levels much more
- B They also block L-type calcium channels
- C They avoid bradykinin-related cough
- D They directly inhibit renin release
Correct answer: They avoid bradykinin-related cough
ARBs block angiotensin II’s action at AT₁ receptors without affecting bradykinin breakdown. This reduces risk of ACE inhibitor–related cough and angioedema.
A patient with essential hypertension and osteoporosis may benefit from which antihypertensive drug due to favorable bone effects?
- A Verapamil
- B Chlorthalidone
- C Propranolol
- D Enalapril
Correct answer: Chlorthalidone
Thiazide-type diuretics such as chlorthalidone reduce urinary calcium excretion and are associated with lower risk of fractures, making them useful in patients with osteoporosis.
Which antihypertensive class typically causes ankle edema and headache due to arteriolar dilation?
- A Beta-blockers
- B ACE inhibitors
- C Calcium channel blockers
- D Loop diuretics
Correct answer: Calcium channel blockers
Calcium channel blockers cause arteriolar vasodilation, which can lead to increased capillary hydrostatic pressure and edema; vasodilation may also trigger headache.
Which medication would be most appropriate for acute hypertensive emergency requiring rapid vasodilation?
- A Amlodipine
- B Hydrochlorothiazide
- C Nitroprusside
- D Lisinopril
Correct answer: Nitroprusside
Nitroprusside is a direct vasodilator that rapidly reduces systemic vascular resistance, useful in hypertensive emergencies requiring prompt BP reduction.
Why might a β-blocker worsen asthma symptoms in a patient with reactive airway disease?
- A Because it typically causes marked fluid retention
- B Because β₂ blockade causes bronchoconstriction
- C Because it strongly induces angiotensin II
- D Because it markedly increases heart rate
Correct answer: Because β₂ blockade causes bronchoconstriction
Non-selective β-blockers block β₂ receptors in bronchial smooth muscle, leading to bronchoconstriction. This can exacerbate asthma or COPD.
Which antihypertensive drug can trigger a persistent dry cough as a side effect?
- A Losartan
- B Amlodipine
- C Lisinopril
- D Spironolactone
Correct answer: Lisinopril
ACE inhibitors like lisinopril increase bradykinin levels by inhibiting its breakdown, which frequently leads to a dry cough.
A patient with hypertension and benign prostatic hyperplasia (BPH) may benefit from which antihypertensive class because it improves urinary symptoms?
- A Calcium channel blockers
- B Alpha-1 adrenergic blockers
- C Beta-blockers
- D ACE inhibitors
Correct answer: Alpha-1 adrenergic blockers
Alpha-1 blockers relax smooth muscle in the bladder neck and prostate, improving urinary flow, while also lowering blood pressure.
Which antihypertensive mechanism acts by reducing circulating blood volume through increased sodium and water excretion?
- A ACE inhibition
- B Beta-adrenergic blockade
- C Diuretic therapy
- D Calcium channel blockade
Correct answer: Diuretic therapy
Diuretics promote natriuresis and diuresis, reducing blood volume and preload, thereby lowering blood pressure.
A patient with hypertension and type 2 diabetes is started on losartan. Which additional benefit besides BP reduction does losartan provide?
- A Causes hyperkalemia without added benefit
- B Slows progression of diabetic nephropathy
- C Markedly increased insulin resistance
- D Reliable dry cough prevention
Correct answer: Slows progression of diabetic nephropathy
ARBs like losartan reduce glomerular hypertension and proteinuria, thereby slowing the progression of diabetic nephropathy in patients with diabetes and hypertension.
Which calcium channel blocker class predominantly affects vascular smooth muscle rather than cardiac conduction and contractility?
- A Non-dihydropyridines
- B Dihydropyridines
- C Class I antiarrhythmics
- D ACE inhibitors
Correct answer: Dihydropyridines
Dihydropyridine CCBs (e.g., amlodipine) act mainly on vascular L-type calcium channels, causing vasodilation with minimal effects on cardiac conduction or contractility.
Which statement about combining a thiazide diuretic with a β-blocker is correct?
- A They act via the same mechanism, so combination is redundant
- B The diuretic-induced renin increase is blunted by β-blocker
- C Combination causes severe hyperkalemia
- D Combination greatly increases heart rate
Correct answer: The diuretic-induced renin increase is blunted by β-blocker
Thiazide diuretics increase renin release via volume reduction; β-blockers blunt this compensatory renin surge, enhancing antihypertensive efficacy.
Which antihypertensive agent is contraindicated in pregnancy because of teratogenic risk to the fetus?
- A Methyldopa
- B Hydrochlorothiazide
- C Enalapril
- D Labetalol
Correct answer: Enalapril
ACE inhibitors like enalapril are teratogenic and can impair fetal kidney development, thus are contraindicated during pregnancy.
Which antihypertensive drug class works in part by reducing aldosterone-mediated sodium and water retention?
- A ACE inhibitors
- B Calcium channel blockers
- C Alpha blockers
- D Non-steroidal anti-inflammatory drugs
Correct answer: ACE inhibitors
ACE inhibitors reduce angiotensin II formation, which decreases aldosterone release, leading to reduced sodium and water retention and lowering BP.
A patient with chronic hypertension has difficulty with adherence to multiple medications. Which strategy is often used to improve compliance?
- A Monotherapy with high-dose diuretic only
- B Fixed-dose combination pills
- C Alternating day dosing
- D Use of only natural remedies
Correct answer: Fixed-dose combination pills
Fixed-dose combination antihypertensive pills simplify regimens and improve adherence, while targeting multiple pathways affecting blood pressure.
Which antihypertensive class tends to be more effective at lowering systolic blood pressure in older adults compared to beta-blockers?
- A Calcium channel blockers and diuretics
- B ACE inhibitors and beta-blockers
- C Alpha-2 agonists and vasodilators
- D Direct renin inhibitors and others
Correct answer: Calcium channel blockers and diuretics
In older patients, diuretics and CCBs are often more effective than beta-blockers for reducing systolic blood pressure.
Which antihypertensive treatment would you choose for a patient with high BP and asthma to avoid bronchoconstriction?
- A Propranolol
- B Non-dihydropyridine CCB
- C Thiazide diuretic
- D Enalapril
Correct answer: Thiazide diuretic
Thiazide diuretics lower BP without affecting bronchial β₂-receptors. They avoid the risk of bronchoconstriction posed by non-selective β-blockers.