This book adresses to the effectiveness of single prophylactic dose of amiodarone in the presence of an irritative arrythymia prone left atrium and its role in restoring sinus rhythm which is always preferred but unattainable.All though many studies have been done in establishing the role of prophylactic oral amiodarone in valve replacement surgery, this study is unique because here prophylactic intravenous amiodarone was administered irrespective of the presence of atrial fibrillation.This study advocates to use low dose intravenous amiodarone prophylactically to reduce adverse arrhythmic events post bypass.