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Figure 2 Color M-mode Doppler of left ventricular filling obtained during esmolol, at baseline and during dobutamine infusion showing the changes in E and v_p. Peak E is given by the maximum color encoded velocity value during early filling (inside enclosed circle), while v_p is given by the slope of the isovelocity lines (white line). E = peak early transmitral flow velocity; v_p = flow propagation velocity. See text for details.