In the treatment of angina, the mechanism of action of an organic nitrate is:

Increased contractility and heart rate.

Slowed heart rate and decreased contractility of the heart.

Relaxation of arterial and venous smooth muscle.

Increased peripheral resistance.

Answer and Explanation

The Correct Answer is C

A. Organic nitrates do not increase contractility and heart rate; they typically decrease myocardial oxygen demand.

B. Organic nitrates do not slow heart rate or decrease contractility of the heart.

C. The mechanism of action of organic nitrates in the treatment of angina is the relaxation of arterial and venous smooth muscle, leading to vasodilation and decreased myocardial oxygen demand.

D. Organic nitrates do not increase peripheral resistance; they typically cause vasodilation.

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Correct Answer is B

Explanation

Explanation:

A. Beta blockers are used to manage blood pressure and heart rate but are a different class.

B. Isosorbide is a nitrate, which is used primarily to treat and prevent episodes of angina by relaxing and widening blood vessels.

C. Calcium channel blockers also manage blood pressure and chest pain but act through a different mechanism.

D. Glycoprotein IIb/IIIa receptor antagonists are used to prevent platelet aggregation and are typically used in acute coronary syndrome, not as a long-term treatment for angina.

A. "Stable angina is predictable in its frequency, intensity, and duration. Unstable angina is when angina episodes become more frequent or severe, and occur during periods of rest.” B. "Unstable angina is predictable in its frequency, intensity, and duration. Stable angina is when angina episodes become more frequent or severe, and occur during periods of rest.” C. "Stable angina is caused by spasms of the coronary arteries. Unstable angina is when angina episodes become more frequent or severe, and occur during periods of rest.” D. "Unstable angina is caused by spasms of the coronary arteries. Stable angina is when angina episodes become more frequent or severe, and occur during period of rest."

Correct Answer is A

Explanation

A. Stable angina is predictable and typically occurs with exertion or emotional stress and is relieved with rest or nitroglycerin. Unstable angina is less predictable and more serious, occurring at rest, with minimal exertion, or worsening pattern from stable angina.

B. This answer misrepresents the characteristics and causes of stable and unstable angina, mixing definitions or incorrectly assigning causes.

C. This answer misrepresents the characteristics and causes of stable and unstable angina, mixing definitions or incorrectly assigning causes.

D. This answer misrepresents the characteristics and causes of stable and unstable angina, mixing definitions or incorrectly assigning causes.

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In the treatment of angina, the mechanism of action of an organic nitrate is:

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Naxlex Comprehensive Predictor Exams

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Correct Answer is B

Explanation

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Correct Answer is A

Explanation

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