A rapid heart rate can lower cardiac output because:

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Study for the Nassau County EMT Test. Prepare with flashcards and multiple-choice questions. Each question is accompanied by hints and explanations. Get ready for your exam!

Multiple Choice

A rapid heart rate can lower cardiac output because:

Explanation:
Cardiac output equals heart rate multiplied by stroke volume. When the heart rate becomes very fast, the time available for the ventricles to fill between beats (diastolic filling time) becomes shorter. If filling time is too short, the ventricles don’t fill completely, so stroke volume drops. Even though the heart is beating faster, the smaller amount of blood pumped with each beat can lead to an overall decrease in cardiac output. In short, insufficient filling time at a rapid rate reduces the amount of blood the heart can eject each beat, lowering total output.

Cardiac output equals heart rate multiplied by stroke volume. When the heart rate becomes very fast, the time available for the ventricles to fill between beats (diastolic filling time) becomes shorter. If filling time is too short, the ventricles don’t fill completely, so stroke volume drops. Even though the heart is beating faster, the smaller amount of blood pumped with each beat can lead to an overall decrease in cardiac output. In short, insufficient filling time at a rapid rate reduces the amount of blood the heart can eject each beat, lowering total output.

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