In the treatment of angina, the mechanism of action of an organic nitrate is:
Increased contractility and heart rate.
Slowed heart rate and decreased contractility of the heart.
Relaxation of arterial and venous smooth muscle.
Increased peripheral resistance.
The Correct Answer is C
A. Organic nitrates do not increase contractility and heart rate; they typically decrease myocardial oxygen demand.
B. Organic nitrates do not slow heart rate or decrease contractility of the heart.
C. The mechanism of action of organic nitrates in the treatment of angina is the relaxation of arterial and venous smooth muscle, leading to vasodilation and decreased myocardial oxygen demand.
D. Organic nitrates do not increase peripheral resistance; they typically cause vasodilation.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
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.
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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