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Figure 5 Global left ventricular ejection fraction (LVEF) (upper panel) and left ventricular diastolic function (lower panel) after 6 and 18 months of right ventricular apex (RVA) (solid bars) and right ventricular outflow tract (RVOT) (open bars) pacing. The LVEF during RVA pacing at 18 months was significantly lower than that during RVOT pacing at 18 months (p < 0.05) and during RVA pacing at 6 months (p < 0.05). At both 6 and 18 months, the peak ventricular filling rate during RVA pacing was lower than that during RVOT pacing (p < 0.05).