Please use this identifier to cite or link to this item:
Title: Atrial fibrillation after coronary artery bypass grafting is associated with sympathetic activation.
Austin Authors: Kalman, J M;Munawar, M;Howes, L G;Louis, William J ;Buxton, Brian F ;Gutteridge, Geoffrey A;Tonkin, Andrew M
Affiliation: Department of Cardiology, Austin Hospital, Melbourne, Australia
Issue Date: 1-Dec-1995
Publication information: The Annals of Thoracic Surgery; 60(6): 1709-15
Abstract: We prospectively investigated the role of sympathetic activation in the etiology of atrial fibrillation following coronary artery bypass grafting.Continuous ambulatory monitoring was performed for 80 hours in 131 patients after coronary artery bypass grafting. Right atrial plasma norepinephrine levels were assessed preoperatively and every 4 hours for 48 hours postoperatively.Of the 131 patients, 50% (65) had development of atrial fibrillation and 36% (47) required treatment. Onset of atrial fibrillation was preceded by a significant increase in sinus rate and atrial ectopic activity. On multivariate logistic regression, elevated mean postoperative norepinephrine levels (5.78 +/- 2.83 versus 3.57 +/- 1.31 nmol/L; p < 0.0001), increased age (68.9 +/- 5.7 versus 63.8 +/- 8.7 years; p = 0.02), and decreased postoperative magnesium levels (0.79 +/- 0.09 versus 0.83 +/- 0.10 mmol/L; p = 0.02) were independently associated with the occurrence of atrial fibrillation.Elevated norepinephrine levels suggest that sympathetic activation may be important in the pathogenesis of atrial fibrillation after coronary artery bypass grafting, and this underlines the importance of beta-adrenoceptor blockade as prophylaxis.
Gov't Doc #: 8787468
DOI: 10.1016/0003-4975(95)00718-0
Type: Journal Article
Subjects: Aged
Atrial Fibrillation.diagnosis.etiology.physiopathology
Coronary Artery Bypass.adverse effects
Electrocardiography, Ambulatory
Prospective Studies
Sympathetic Nervous System.physiopathology
Appears in Collections:Journal articles

Show full item record

Google ScholarTM


Items in AHRO are protected by copyright, with all rights reserved, unless otherwise indicated.