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Figure 7 Tissue tracking (TT) in a patient with heart failure and left bundle branch block. An irregular distribution of color-bands is seen during systole (left panel), indicating poor systolic performance of the lateral wall. Systolic apical displacement occurs only in the basal part of the lateral wall, whereas the remaining parts of the lateral wall show no net apical displacement during systole (gray color). After adjusting the TT time interval to left ventricular diastole (identified by aortic valve closure and mitral valve closure), the delayed longitudinal shortening of the lateral wall can be visualized by the apical displacement during diastole (right panel).
