In a left ventricular pressure-volume loop, what does the width of the loop represent?

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Prepare for the Cardiovascular Dynamics Lab Test. Utilize flashcards and multiple choice questions with hints and explanations. Boost your test readiness!

Multiple Choice

In a left ventricular pressure-volume loop, what does the width of the loop represent?

Explanation:
The width of the left ventricular pressure-volume loop represents the amount of blood the ventricle ejects per beat: the stroke volume. On the loop, the horizontal axis is volume, from end-diastolic volume (at the start of systole) to end-systolic volume (at the end of systole). The difference between these two volumes is the stroke volume, so the wider the loop, the larger the stroke volume. This width does not reflect LV pressure (that’s the vertical dimension), heart rate, or the end-diastolic volume itself.

The width of the left ventricular pressure-volume loop represents the amount of blood the ventricle ejects per beat: the stroke volume. On the loop, the horizontal axis is volume, from end-diastolic volume (at the start of systole) to end-systolic volume (at the end of systole). The difference between these two volumes is the stroke volume, so the wider the loop, the larger the stroke volume. This width does not reflect LV pressure (that’s the vertical dimension), heart rate, or the end-diastolic volume itself.

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