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We hypothesized that chronic atrial fibrillation (AF) originated from the pulmonary veins, and was maintained by irregular activations of the posterior left atrium. We had performed the box pulmonary vein isolation procedure for the elimination of chronic AF associated with solitary mitral valve disease from 1999 to 2004. This paper evaluated the long-term results of this procedure over more than 6 years, and discussed the role of the pulmonary veins and posterior left atrium in maintaining AF.

Long-Term Results after the Box Pulmonary Vein Isolation Procedure for Chronic Atrial Fibrillation in Mitral Valve Surgery