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Figure 3 Tetralogy of Fallot (TOF) patients with and without left ventricular asynchrony. According to the mean left ventricular delay among the normal subjects, a normal range (mean ± 2 SD) was plotted. Using this normal range, TOF patients were further divided into two groups: group 1, TOF patients without left ventricular asynchrony (n = 12, 48%) and group 2, TOF patients with left ventricular asynchrony (n = 13, 52%). Solid circles = patients after TOF repair; open triangles = healthy control subjects.