Lateral Tissue Doppler S' Unit Converter

Lateral Tissue Doppler S' (S prime) is an echocardiographic measurement of the peak systolic velocity at the lateral mitral annulus. It reflects how quickly the heart muscle contracts in the longitudinal direction during each heartbeat.

Because the apex of the heart stays relatively still during contraction, the movement of the mitral annulus toward the apex serves as a reliable indicator of overall left ventricular systolic function. S' captures this motion as a velocity, measured in centimeters per second (cm/s).

The lateral measurement is taken from the side wall of the left ventricle, which typically shows higher velocities than the septal (middle) wall. It is often reported alongside the septal S' and other tissue Doppler parameters such as e' and a'.

The S' velocity originates from the longitudinal contraction of left ventricular myocardial fibers, particularly the subendocardial fibers that run from base to apex. It is measured at the lateral mitral annulus using tissue Doppler imaging during a standard echocardiogram.