Fig 4.

Velocity-encoded particle tracings during assisted state (top panel) and unassisted state (bottom panel) in the same animal. Three phases of the cardiac cycle are shown: (A) early systole, (B) late systole, and (C) early diastole. In assisted systole (top panel A and B), there is efflux of blood in all directions away from the posterolateral scar. In contrast, during unassisted systole (bottom panel A and B) there is discoordinate movement of blood toward the infarct. Assisted systole (top panel C) shows augmentation of mitral inflow through the posterolateral toward the apex. Little movement of blood is identified during unassisted diastole (bottom panel C). Large flow voids are also visible along the unassisted posterolateral wall, which was improved after device activation. Bracket indicates posterolateral wall/device position. (Ao = aortic root; Ap = apex; LA = left atrium; RV = right ventricle.)