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
Explanation:
A. There is no evidence in the scenario to suggest that Ms. Garcia developed unstable angina.
B. Exposure to light, particularly sunlight, can degrade nitroglycerin, reducing its effectiveness over time.
C. There is no indication that Ms. Garcia developed tolerance to sublingual nitroglycerin in this scenario.
D. Ms. Garcia's storage method for the nitroglycerin tablets, not the interval or duration of administration, likely affected their effectiveness.
Correct Answer is D
Explanation
A. Taking cholestyramine with food may interfere with its absorption, reducing its effectiveness.
B. Taking cholestyramine without food is not typically recommended.
C. Taking cholestyramine in the morning is not specifically indicated; it can be taken at any time of the day.
D. Taking cholestyramine with large amounts of fluid helps prevent gastrointestinal side effects and improves its effectiveness in lowering cholesterol levels.
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