**Question:** Which of the following drug is most likely to precipitate angina:

A. Nitroglycerin
B. Beta-blockers
C. Calcium channel blockers
D. ACE inhibitors

**Core Concept:**
Angina is a clinical term describing chest pain caused by reduced blood flow to the heart muscle, typically due to coronary artery disease. Drugs that can precipitate angina may do so by causing a mismatch between oxygen demand and supply in the heart, worsening the condition.

**Why the Correct Answer is Right:**
Nitroglycerin (Option A) is a potent vasodilator, causing smooth muscle relaxation and increased blood flow to the heart. However, this increased flow can cause a mismatch between oxygen demand and supply, leading to angina in patients with underlying coronary artery disease.

**Why Each Wrong Option is Incorrect:**
Beta-blockers (Option B) are used to lower heart rate and blood pressure, reducing cardiac workload and decreasing myocardial oxygen demand. Although they may occasionally cause angina in susceptible patients, their primary effect is not to precipitate angina.

Calcium channel blockers (Option C) are used to lower blood pressure and heart rate by blocking calcium influx into myocardial cells, thereby reducing myocardial workload and oxygen demand. Similarly to beta-blockers, calcium channel blockers are primarily used to treat cardiovascular conditions rather than precipitate angina.

ACE inhibitors (Option D) are used to lower blood pressure and heart rate by blocking angiotensin II and angiotensin converting enzyme (ACE) pathways, leading to vasodilation. While they may cause angina in susceptible patients, their primary function is to lower blood pressure and reduce cardiac workload, not precipitate angina.

**Clinical Pearl:**
In clinical practice, it is essential to consider angina precipitation when prescribing vasodilators (such as nitroglycerin) in patients with underlying coronary artery disease. This information helps to make an informed decision about the choice of medication and monitor for potential adverse effects.

**Correct Answer:** Beta-blockers (Option B)

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For patients with coronary artery disease, precipitating angina is less likely with beta-blockers compared to nitroglycerin. Beta-blockers primarily serve to reduce cardiac workload and lower cardiovascular risk factors, rather than causing increased myocardial oxygen demand, thereby reducing the likelihood of angina precipitation.