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Longitudinal strain rate and strain: multiple simultaneous traces from three different regions in the septum. Left: strain rate, Right: Strain. As thelongitudinal systolic deformation is shortening, the systolic strain and strain rate is negative. The strain curves shows the gradual decrease in length during systole, and then the gradual lengthening during diastole, but strain rate fremans negative during the whole heart cycle, as the ventricular length is shorter than at end systole. Strain rate is the rate of deformation, and is negative during systole, when the ventricle shortens. Strain rate, however, becomes positive when the ventricle lengthens. Thus the more rapid phase shifts show details of the lengthening, displaying that it is not homogeneous.

Own work

Asbjorn Stoylen

See below.