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Figure 3 Still images of an apical four-chamber two-dimensional view and tissue Doppler-derived strain rate color map (left). The graph shows a typical longitudinal strain rate with the mechanical events of the left (LV) and right ventricle (RV) during conventional dual-chamber pacing. HR = heart rate; IVT = isovolumic tensing; PSC = peak systolic contraction; SR = strain rate; SRI = strain rate index; V = ventricle.