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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 vp. Peak E is given by the maximum color encoded velocity value during early filling (inside enclosed circle), while vp is given by the slope of the isovelocity lines (white line). E = peak early transmitral flow velocity; vp = flow propagation velocity. See text for details.
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