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Figure 1 Examples of posterior wall myocardial velocity gradient (MVG) (top), tissue Doppler imaging (TDI) M-mode images (middle), and corresponding transmitral flow velocity patterns (bottom) with electrocardiograms (ECG), phonocardiograms (PCG), tracings of left ventricular pressure (LVP), and first derivative of left ventricular pressure for a representative patient with hypertrophic cardiomyopathy. The arrow and blue line indicate the period of peak negative MVG. The peak negative MVG for this patient was –2.12/s.