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
Explanation:
A. This statement accurately reflects the relationship between high cholesterol levels and cardiovascular disease risk.
B. This statement is incorrect; dietary modifications are often recommended to help control cardiovascular risk, including reducing cholesterol intake.
C. This statement is incorrect; high cholesterol levels are a well-established risk factor for cardiovascular disease.
D. This statement is incorrect; while family history can predispose individuals to high cholesterol, anyone can develop high cholesterol and be at risk for cardiovascular disease.
Correct Answer is A
Explanation
Explanation:
A. This is because lithium levels can be affected by changes in sodium balance and hydration levels in the body. Excessive sweating can lead to dehydration, which can increase lithium levels and potentially lead to toxicity. Therefore, it is important for clients to be aware of the need to maintain hydration and to communicate with their healthcare provider if there are any significant changes in their fluid balance, such as those caused by excessive sweating.
B. Stopping lithium abruptly, especially when moods are stable, can lead to relapse of bipolar disorder symptoms and is not recommended.
C. Regular monitoring of blood levels of lithium is essential to ensure therapeutic levels and prevent toxicity; therefore, the statement indicating the client no longer needs blood checks is incorrect.
D. Restricting salt intake lowers the sodium levels which can decrease lithium elimination, hence increasing the risk of toxicity.
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