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Comparison of extensive encircling pulmonary vein isolation with and without interpulmonary isthmus ablation on posteroanterior and internal views of the pulmonary veins. White dots represent ablation points. LSPV, left superior pulmonary vein; RSPV, right superior pulmonary vein; RIPV, right inferior pulmonary vein; LIPV, left inferior pulmonary vein; PA, posterior-anterior; PV, pulmonary vein.
