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  Indian J Med Microbiol
 

Figure 3 Example of longitudinal strain rate (SR) graph (Doppler derived). Longitudinal strain rate using the region of interest. y-Axis represents strain rate (s-1), x-axis represents time (one cardiac cycle). Note the negative SR during systole when ε becomes more negative (myocardial shortening) and the positive SR during the upstroke of the strain curve during the E and A wave. The SR is zero when no deformation occurs [18].

Figure 3 Example of longitudinal strain rate (SR) graph (Doppler derived). Longitudinal strain rate using the region of interest. <i>y</i>-Axis represents strain rate (s-1), <i>x</i>-axis represents time (one cardiac cycle). Note the negative SR during systole when <i>ε</i> becomes more negative (myocardial shortening) and the positive SR during the upstroke of the strain curve during the E and A wave. The SR is zero when no deformation occurs [18].