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Eur J Cardiothorac Surg 1999;16:435-439
© 1999 Elsevier Science NL
Istituto Medico-Chirurgico di Cardiologia, Piazza, L. Miraglia, 80138 Napoli, Italy
Corresponding author. Present address: Corso Europa 72, 80127, Naples, Italy. Tel.: +39-081-643-055; fax: +39-081-714-5205
e-mail: adandrea{at}synapsis.it
Objective: Atrial fibrillation (AF) is the most frequently encountered arrhythmic complication associated with coronary surgery. The aim of this paper was then to identify the clinical predictors of post-CABG AF occurrence. Methods: 150 consecutive patients were included in this study and divided into two groups according to the absence (SR group, 104 male and 22 female, age 58.4±8.8 years) or presence (AF group, 23 male and 1 female, age 65.4±6.3 years) of post-CABG AF. Forty-seven perioperative variables were considered. Results: After univariate analysis, advanced age (SR vs. AF: 58.4±8.8 vs. 65.4±6.3, P<0.001), an increased BMI (SR vs. AF: 26.1±2.7 vs. 27.4±2.5, P=0.026), a prior history of paroxysmal AF (SR vs. AF: 3.2% vs. 16.7%, P=0.028), left atrial enlargement (SR vs. AF: 21.1% vs. 70.8%, P<0.001) and a more severe coronary artery disease (CAD) (SR vs. AF: no. of diseased vessels: 2.42±0.7 vs. 2.91±0.3, P=0.001; three-vessel CAD (54.1% vs. 91.3%, P=0.002) were the only factors that statistically differed between the groups. Multivariate logistic regression analysis identified left atrial enlargement (P<0.0001), a prior history of paroxysmal AF (P=0.007) and a more severe CAD (P=0.0047) to be independent correlates for AF. Conclusions: Post-CABG AF seems to require a well definite anatomical and electrical substrate that is generated by increased left atrial dimensions, a greater extension of coronary lesions and a possible electrical remodeling consequent to prior repetitive episodes of paroxysmal AF.
Key Words: Atrial fibrillation Coronary artery bypass graft Postoperative arrhythmia
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