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
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Related Questions
Correct Answer is B
Explanation
A. Meperidine is contraindicated with monoamine oxidase inhibitors (MAOIs) and can lead to serotonin syndrome rather than being an antidote for hypertensive crisis.
B. Calcium channel blockers, such as nifedipine, are commonly used as antidotes for hypertensive crisis associated with MAOI use.
C. Carbamazepine is not indicated for the treatment of hypertensive crisis associated with MAOI use.
D. Dextromethorphan is contraindicated with MAOIs due to the risk of serotonin syndrome.
Correct Answer is C
Explanation
A. Verapamil is a calcium channel blocker, not a beta blocker.
B. Captopril is an angiotensin-converting enzyme (ACE) inhibitor, not a beta blocker.
C. Atenolol is a beta blocker commonly used to treat hypertension, angina, and other cardiovascular conditions.
D. Clopidogrel is an antiplatelet medication used to prevent blood clots, not a beta blocker.
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