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Intraoperative assessment of left ventricular diastolic function using mid-esophageal four-chamber view of transesophageal echocardiography. (A) Transmitral flow velocity measured by pulse-wave Doppler echocardiography. E indicates E-wave, representing the peak early transmitral velocity. (B) Mitral annular velocity measured by tissue Doppler imaging. e' represents the early diastolic velocity at the mitral annulus.
