What does FS mean on echocardiogram?

Fractional shortening (FS) is a 2D M-Mode method. Using the M-Mode the parameters left ventricular end-systolic diameter (LVESD) and the left ventricular end-diastolic diameter (LVEDD) can be derived. These parameters refer to the size of the ventricle (captured with the M-Mode) at the end of systole and diastole.

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