Figure 4. Dynamic appearance and disappearance of AP dome in the intra-trabecular Endo and phase-2 reentry-induced propagated extrasystole originating from the Endo of the RVOT in the presence of terfenadine. Each panel shows simultaneously recorded ECG and action potentials (AP). All recordings were obtained from the same preparation. The stimulation electrode was located on the “smooth” Endo.