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Figure 2 Kaplan-Meier Curves According to Combinations of LVEF, NSVT, and QTe-Slope

Kaplan-Meier estimates for arrhythmia-free survival for: (A) combinations of left ventricular ejection fraction (LVEF) (35% or >35%) and presence or absence of nonsustained ventricular tachycardia (NSVT) (NSVT+ and NSVT–, respectively); (B) combinations of LVEF (35% or >35%) and slope of linear regression analysis of QT end and RR intervals (QTe-slope) (>0.19 or 0.19); (C) combinations of LVEF >35%, NSVT– and QTe-slope <0.19 (Group A); LVEF >35%, NSVT+ or QTe-slope >0.19 (Group B); LVEF 35%, NSVT–, and QTe-slope 0.19 (Group C); LVEF 35%, NSVT+ or QTe-slope >0.19 (Group D). No differences were observed among survival curves of patients belonging to Group A, B, and C (chi-square 1.36; p = 0.51). Only when Group D patients were included in the analysis did the comparison reach statistical significance (chi-square 20.20; p < 0.0001).