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
A. Naproxen does not typically interact with sildenafil.
B. Sildenafil interacts with nitrates such as isosorbide, leading to severe hypotension, making it contraindicated in patients taking nitrates.
C. Metformin does not typically interact with sildenafil.
D. Cefuroxime does not typically interact with sildenafil.
Correct Answer is ["A","C"]
Explanation
A. Feelings of despair or hopelessness are common symptoms of depression, reflecting a persistent low mood.
B. Increased energy is not typically associated with depression; instead, individuals with depression often experience fatigue or loss of energy.
C. Sleep disturbances, such as insomnia or hypersomnia, are common symptoms of depression, affecting both the ability to fall asleep and stay asleep.
D. Euphoria, or a feeling of intense happiness or excitement, is not typically associated with depression and may indicate a different mood disorder, such as bipolar disorder.
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