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Figure 8 Comparison of circumferential post-systolic shortening (PSS) in the apical subepicardium with hemodynamic pressure tracings. The repolarization wave in epicardial bipolar tracing (arrow) extends well beyond the aortic valve closure and beyond the T-wave on the surface electrocardiogram. The right panel shows linear regression analysis and correlation between the period of diastole occupied by post-systolic subepicardial contraction (Tpeak, X-axis) in the eight pigs and the diastole time period required for reaching minimum left ventricular (LV) diastolic pressures (TLVmin, Y-axis). Values on both axes are expressed as percentage of the entire diastolic relaxation period. Ao = aortic; AVO = aortic valve opening; EMG = electromyogram; LA = left atrial; MVO = mitral valve opening; Tpeak = time to peak strain; TVLVmin = time-to-minimum LV pressure.
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