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Abstract
Atrial fibrillation (af) is the most prevalent cardiac arrhythemia treated in clinical practice .it is associated with significant morbidity and mortaily . in cardiac surgery, chronic af is exceptionally importamt because it is associated with significant morbidity and morality compared to patients with sr. the purpose of this study is diected towards assessing the feasibility , safety &efficacy of circumferential isolation of right and left pulmonary veinus