Why Would a Heart Rate in Excess of 170 to 220

question 23

Multiple Choice

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.

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