Asystole has an exceedingly high mortality rate because it:
A. reflects a prolonged period of myocardial ischemia.
B. does not respond favorably to cardiac defibrillation.
C. is usually the result of a massive myocardial infarction.
D. most often occurs in patients with significant heart disease.
Answer: A. reflects a prolonged period of myocardial ischemia.
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