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 B
Explanation
A. Slow heart rate and difficulty standing are not typical symptoms of angina.
B. Chest pain that occurs on physical exertion or emotional stress is the classic symptom of angina, caused by reduced blood flow to the heart muscle.
C. Sudden weakness with a severe headache could suggest other medical issues such as a stroke, not angina.
D. Difficulty breathing and increased temperature are not specific to angina and could indicate other health problems like infection or respiratory issues.
Correct Answer is D
Explanation
A. Fibric acids are a different class of lipid-lowering agents.
B. Bile acid resins are another class of drugs used to lower cholesterol but work differently.
C. Omega-3 fatty acids are used to lower triglycerides and improve heart health but are not HMG-CoA reductase inhibitors.
D. Statins are drugs that inhibit the enzyme HMG-CoA reductase, which is crucial in the synthesis of cholesterol, thereby lowering cholesterol levels.
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