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Figure 4 Simultaneous recordings of the ECG and the MAPs in the RVOT and RVA during failed internal defibrillation shock delivered by the implantable cardioverter defibrillator (ICD). The PSRT in the RVOT is 125 ms; the PSRT in the RVA is 210 ms. The PSDR is 85 ms. The VF persisted following the shock. Abbreviations as in Figure 1.