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 A
Explanation
A. Shaving excess hair from the skin before applying a nitroglycerin patch helps ensure proper adhesion and absorption of the medication.
B. Used nitroglycerin patches should be folded with the medication area to the inside and disposed of in a manner that prevents accidental exposure to others.
C. Nitroglycerin patches are typically worn for a specified duration, often 12 to 14 hours, before being removed and replaced with a new patch.
D. Using multiple nitroglycerin patches simultaneously is not recommended and could lead to overdose.
Correct Answer is D
Explanation
A. One and one-half tablets would exceed the prescribed dose.
B. One-quarter of a tablet would be 12.5 mg, which is less than the prescribed 25 mg.
C. One tablet would provide 50 mg, which is double the prescribed dose for the first week.
D. Half a tablet of a 50 mg tablet would correctly provide the 25 mg dose prescribed for the first week.
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