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Figure 2 An example of exit block of the pulmonary vein (PV) potential after isolation of the left inferior PV using cryoablation. Isolation of the PV is confirmed by abolition (but there are still potentials visible) of all PV potentials as recorded by the decapolar ring catheter (PV1-2 to PV10-1). Exit block of the PV potential (arrow) is observed during spontaneous discharge inside the PV. CSDis = distal coronary sinus; CryoDis = cryoablation catheter.
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