Why would a heart rate in excess of 170 to 220 bpm result in decreased cardiac output?
A) The diastolic time becomes too short to allow adequate ventricular filling.
B) The sinoatrial conduction slows down at high heart rates.
C) The blood volume in the ventricles is normal but the ejection fraction decreases.
D) The systolic time becomes too short to allow adequate ventricular emptying.
Correct Answer:
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