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Figure 5 Monophasic action potential recordings obtained from the MAP catheter positioned at the RV apex during pacing at 120 beats/min. Top, Before ablation, APD90 was 229 ms and ERP was 200 ms, with evidence of capture at a coupling interval equal to 210 ms. Bottom, After ablation, APD90 increased to 258 ms and premature stimuli delivered at a coupling interval of 220 ms failed to capture. The ERP increased from 200 ms before ablation to 220 ms after ablation.