In the treatment of angina, the mechanism of action of a beta-adrenergic blocker is:
Decreased peripheral resistance.
Increased contractility and heart rate.
Relaxation of arterial and venous smooth muscle.
Slowed heart rate and decreased contractility of the heart.
The Correct Answer is D
A. Beta-adrenergic blockers primarily work by decreasing heart rate and contractility rather than directly affecting peripheral resistance.
B. Beta-adrenergic blockers decrease contractility and heart rate, rather than increasing them.
C. Relaxation of arterial and venous smooth muscle is typically associated with calcium channel blockers, not beta-adrenergic blockers.
D. Beta-adrenergic blockers slow the heart rate and reduce the force of contraction of the heart muscle, reducing myocardial oxygen demand and helping to relieve angina symptoms.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. The normal therapeutic range for lithium is typically considered to be between 0.6-1.5 mEq/L. Levels above or below this range may indicate the need for dosage adjustment or potential toxicity.
B. The normal therapeutic range for lithium is typically considered to be between 0.6-1.5 mEq/L. Levels above or below this range may indicate the need for dosage adjustment or potential toxicity.
C. The normal therapeutic range for lithium is typically considered to be between 0.6-1.5 mEq/L. Levels above or below this range may indicate the need for dosage adjustment or potential toxicity.
D. The normal therapeutic range for lithium is typically considered to be between 0.6-1.5 mEq/L. Levels above or below this range may indicate the need for dosage adjustment or potential toxicity.
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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