What is the cause of a myocardial infarction?
a. Decreased perfusion to the pulmonary ar-tery
b. Partial or complete obstruction of a coro-nary artery
c. Blockage in one or more of the great ves-sels
d. Narrowing of part of the aorta
ANS: B
Partial obstruction of a coronary artery may lead to tissue ischemia (decreased O2 supply), a clin-ical condition called angina pectoris. Complete obstruction may cause tissue death or infarct, a condition called myocardial infarction (MI).
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