title: [Postoperative atrial fibrillation in myocardial revascularization].
abstract: Many studies have demonstrated fairly high incidence of supraventricular arrhythmias after coronary artery bypass surgery, and have tried to identify preoperative, operative and postoperative factors related to their appearance. The present paper analysed 186 patients submitted to coronary artery bypass and reported a incidence of atrial fibrillation of 6.04% (11 cases). The male sex was dominant (81.2%) with ages varying from 49 to 73 (mean 54.58) years. The preoperative incidence of diabetes, smoking and systemic hypertension were, respectively, 18.2%, 54.51% and 36.4%. The mean number of vessels bypassed was 2.42 +/- 1.19 and the left circumflex artery was involved in 81.20% of these cases. Cardiopulmonary bypass time was 100 +/- 39.6 min and ischemic arrest time of 79.6 +/- 37.7 min. Single double stage cannulae for venous drainage were used in 45.5% of the patients and ventricular fibrillation and cardiac overdistention occurred in 63.60% immediately after CPB. Atrial fibrillation presented around 1.66 +/- 2.17 days in the postoperative period and 45.5% of the patients had more than one distinct episode of the arrhythmia. Treatment constituted of cardioversion in 25%, atenolol oral in 18.75% and digitalis associated to quinidine in 56.25%. These numbers permit us to suggest that some of the above factors may contribute to the genesis of arrhythmias, such as single double stage cannulation for venous drainage, inadequate myocardial protection, overdistention and cardiac fibrillation and, mainly, the presence of proximal circumflex artery obstructions responsible for atrial ischemia before and during surgery.
authors.forename: R N
authors.initials: RN
authors.lastname: Sgarbieri
authors.forename: J N
authors.initials: JN
authors.lastname: de Freitas
authors.forename: P R
authors.initials: PR
authors.lastname: Evora
authors.forename: J C
authors.initials: JC
authors.lastname: Brasil
authors.forename: P J
authors.initials: PJ
authors.lastname: Ribeiro
authors.forename: A G
authors.initials: AG
authors.lastname: Otaviano
authors.forename: H L
authors.initials: HL
authors.lastname: Bongiovanni
authors.forename: A C
authors.initials: AC
authors.lastname: Menardi
authors.forename: M A
authors.initials: MA
authors.lastname: Ferez
mesh_terms: D000368:Aged; D001281:Atrial Fibrillation / Q000209:etiology* / Q000628:therapy; D005112:Extracorporeal Circulation; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009204:Myocardial Revascularization; D011183:Postoperative Complications; D012189:Retrospective Studies; D012307:Risk Factors
vernacular_title: Fibrilação atrial pós-operatória na revascularização do miocárdio.