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Figure 6 Immediate effect of cardiac resynchronization therapy (CRT) on the severity of mitral regurgitation. Color-coded Doppler echocardiography shows moderate mitral regurgitation during no pacing (CRT OFF, A) and the estimated left ventricular (LV)peak +dP/dt is 361 mm Hg/s (CRT OFF, B). During CRT, the mitral regurgitant jet is smaller, corresponding to mild mitral regurgitation (CRT ON, C). The simultaneously acquired LVpeak +dP/dt by continuous-wave Doppler echocardiography has improved significantly to 823 mm Hg/s (CRT ON, D).
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