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Figure 2 Total isovolumic time (IVT) at rest and peak stress in the control group and four patient groups. Total IVT was increased at peak stress in patients with left bundle branch block (LBBB) due to prolongation at rest and only shortened with stress in the absence of coronary artery disease (CAD). Data are given as the mean value ± SD. R = rest; S = stress; ns = not significant. ***p < 0.001.