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- Isolation of pulmonary veins with duty-cycled circular multi-polar catheter : randomized controlled clinical trialPublication . Pinto, Fausto J.; Sobral, S.; Ribeiro, J.; Barreiros, C.; Bernardes, Ana; António, P. Silvério; Ferreira, A. Nunes; Silva, Gustavo Lima; Carpinteiro, Luís; Cortez-Dias, Nuno; Sousa, João deIntroduction: Pulmonary vein isolation (PVI) is the central element in the ablation of atrial fibrillation (AF), and can be obtained with different ablation modalities. The dutycycled circular multipole catheter PVAC® (Medtronic) allows linear application of radiofrequency energy, with the production of circumferential lesions. Conceptually, it can make ablation simpler and faster in patients with favorable anatomy.