Tricuspid annular plane systolic excursion (TAPSE) is measured as the linear displacement of the tricuspid annulus during systole and is expressed in centimeters (cm). It quantifies right ventricular longitudinal systolic function.

Centimeters per second is a velocity measurement used in tissue Doppler imaging. Milliliters per minute refers to volume flow, and millimeters of mercury measures pressure.

This is standardized in the 'Textbook of Clinical Echocardiography, 6e', Chapter on Right Ventricular Functional Assessment20:320-325Textbook of Clinical Echocardiography.