The most common cause of myocardial ischemia is:
a. idiopathic vasospasm.
b. arterial emboli from a heart valve.
c. atherosclerosis.
d. venous emboli.
ANS: C
The most common cause of myocardial ischemia is atherosclerosis. Myocardial ischemia is not caused by idiopathic vasospams or venous emboli. Arterial emboli may cause ischemia, but ath-erosclerosis is the major cause of myocardial ischemia.
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