Anatomy & Physiology第 77 / 100 题
How does stable angina differ from a myocardial infarction?
a.Angina causes permanent muscle death; an infarction does not
b.Angina is temporary ischemia relieved by rest or nitroglycerin, while an infarction is prolonged blockage causing tissue death
c.Angina always shows ST elevation; an infarction never does
d.Angina occurs only at rest; an infarction occurs only with exertion
解析
Angina is chest pain from temporary oxygen shortage in the myocardium, typically brought on by exertion and relieved within minutes by rest or nitroglycerin, and it may show transient ST depression or T wave inversion. A myocardial infarction is sustained occlusion that kills muscle tissue and often produces ST elevation and later Q waves. It is the infarction, not angina, that causes permanent damage.
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