fractional shortening
Echocardiographic measure of left ventricular systolic function calculated from end-diastolic and end-systolic dimensions.
Full Definition
Fractional shortening (FS) is an echocardiographic parameter that quantifies left ventricular systolic function by measuring the percentage change in left ventricular internal dimension during systole. It is calculated as (end-diastolic dimension - end-systolic dimension)/end-diastolic dimension × 100. Normal fractional shortening ranges from 25-45%, with values below 25% indicating systolic dysfunction. In cardiothoracic anesthesia, fractional shortening provides a simple, reproducible assessment of cardiac contractility that helps guide perioperative management decisions, particularly regarding the need for inotropic support or mechanical circulatory assistance.
Usage
Usage note: Express as percentage; abbreviated as FS in clinical documentation.
In Context
- "Preoperative echocardiography showed reduced fractional shortening of 18%, indicating significant left ventricular dysfunction." — Cardiac catheterization report
- "The patient's fractional shortening improved from 20% to 32% following mitral valve repair." — Postoperative echocardiogram