What is the normal fractional shortening of the left ventricle?

The normal fractional shortening of the left ventricle is considered to be greater than 25%. This measurement is an important parameter in assessing left ventricular function and contractility. Fractional shortening is calculated using the formula:

Fractional Shortening (%) = (LVEDD - LVESD) / LVEDD × 100

where LVEDD is the left ventricular end-diastolic diameter and LVESD is the left ventricular end-systolic diameter. A fractional shortening greater than 25% indicates that the left ventricle is contracting effectively and is a sign of good cardiac health. Values lower than this can suggest impaired ventricular function and may prompt further evaluation for conditions such as heart failure or cardiomyopathy.

Understanding the ranges of fractional shortening is crucial because it helps clinicians assess the overall cardiac output and performance of the heart during ejection.