Tissue Doppler Imaging : Evaluation Of Regional And Global Systolic Function

Evaluation Of Regional And Global Systolic Function

The extent of systolic movement of the mitral annulus correlates with LV systolic function and stroke volume. Normally, the systolic velocity (Sa or S’) of the mitral annulus is more than 6 cm/s. Although TDI of the mitral annulus reflects the global systolic and diastolic function of the LV, segmental or regional function can be assessed by performing TDI of various LV segments by placing the sample volume (2-5 mm) in the region of interest. The size of the sample volume depends on the location and intensity of the signal and is usually between 2-5 mm. Futher clinical experience with this variable will determine if Sa (or S’) can replace other more commonly used systolic variables.