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Figure 3 The summed rest (upper panel) and stress (lower panel) scores for dipyridamole thallium-201 myocardial scintigraphy after 6 and 18 months of right ventricular apex (RVA) (solid bars) and right ventricular outflow tract (RVOT) (open bars) pacing. The summed rest and stress scores during RVA pacing at 18 months were significantly higher than those during RVOT pacing at 18 months (p < 0.05) and during RVA pacing at 6 months (p < 0.05).