Average Tissue Doppler e' Unit Converter

Average Tissue Doppler e' (also called average e-prime) is an echocardiography measurement that reflects how well your heart muscle relaxes during early filling. It is calculated as the average of two velocities measured at the septal and lateral sides of the mitral valve annulus using pulsed-wave tissue Doppler imaging.

The e' wave captures the speed at which the mitral annulus moves downward as the left ventricle fills with blood in early diastole. Higher velocities indicate the heart is relaxing normally, while lower velocities suggest impaired relaxation.

Averaging the septal and lateral measurements helps standardize the result, since lateral e' is normally slightly higher than septal e' due to differences in myocardial fiber orientation.

The e' velocity originates from the movement of the left ventricular myocardium itself. It is measured at the mitral valve annulus as the heart muscle actively relaxes and lengthens during early diastolic filling.