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Figure 1 Short-Axis Views During Baseline, Dobutamine Infusion, and LAD Occlusion, and the Corresponding Velocity, Strain, and SR Curves Obtained by VVI

Note the increased amplitude of the velocity vectors and velocity, strain, and strain rate (SR) values during dobutamine infusion and the dyskinetic motion, positive strain, and SR pattern during left anterior descending coronary artery (LAD) occlusion. End-diastole and end-systole (time of peak –dP/dt) are shown in blue lines. Values of the regional function parameters are shown. VVI = Velocity Vector Imaging.