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Published on: February 26, 2013
New-Onset Atrial Fibrillation After Cardiac Surgery is a Significant Risk Factor for Long-Term Stroke: An Eight-Year
Kevin K P Wang1, Weiling Liu2, Sophia T H Chew3
1Yong Loo Lin School of Medicine, National University of Singapore, Singapore.
Insights
New-onset atrial fibrillation after cardiac surgery significantly increases the risk of long-term stroke and mortality. Early detection and management are crucial for improving patient outcomes and reducing these serious complications.
Area of Science:
- Cardiology
- Cardiac Surgery
- Epidemiology
Background:
- Atrial fibrillation is a common arrhythmia.
- Postoperative atrial fibrillation (POAF) is a known complication after cardiac surgery.
- The long-term impact of new-onset atrial fibrillation on stroke and mortality requires further investigation.
Purpose of the Study:
- To determine the incidence of new-onset atrial fibrillation following cardiac surgery.
- To evaluate new-onset atrial fibrillation as an independent risk factor for long-term stroke.
- To assess the association between new-onset atrial fibrillation and long-term mortality after cardiac surgery.
Main Methods:
- Prospective cohort study involving 3008 patients undergoing coronary artery bypass grafting and/or valve surgery.
- Analysis of new-onset atrial fibrillation as a risk factor for postoperative stroke using multivariate logistic regression.
- Cox regression modeling with time-dependent variables to assess the relationship between new-onset atrial fibrillation and survival.
Main Results:
- New-onset atrial fibrillation occurred in 19.0% of patients.
- The incidence of postoperative stroke was significantly higher in patients with new-onset atrial fibrillation (9.9%) compared to those without (6.8%).
- New-onset atrial fibrillation was an independent risk factor for postoperative stroke (OR, 1.53) and was associated with significantly shorter survival (HR, 1.49).
Conclusions:
- New-onset atrial fibrillation is a significant predictor of long-term stroke and mortality after cardiac surgery.
- Close monitoring and timely treatment of new-onset atrial fibrillation are essential.
- Strategies to mitigate the risks associated with new-onset atrial fibrillation should be implemented to improve patient outcomes.
Objectives:
This study sought to determine the incidence and significance of new-onset atrial fibrillation as a risk factor for long-term stroke and mortality after cardiac surgery.
Design:
A prospective cohort study.
Setting:
Two large tertiary public hospitals.
Participants:
The study comprised 3008 patients who underwent coronary artery bypass grafting and/or valve surgery from 2008 to 2012.
Interventions:
None.
Measurements And Main Results:
New-onset atrial fibrillation was analyzed as a risk factor for postoperative stroke using a multivariate logistic regression model after adjustment for potential confounders. A Cox regression model with time-dependent variables was used to analyze relationships between new-onset atrial fibrillation and postoperative survival. New-onset atrial fibrillation was detected in 573 (19.0%) patients. Stroke occurred in 234 (7.8%) patients during the mean postoperative follow-up period of six ± two years. The incidence of postoperative stroke in patients with new-onset atrial fibrillation (9.9%) and patients with both preoperative and postoperative atrial fibrillation (13.8%) was higher than in patients with no atrial fibrillation (6.8%) (p = 0.002). New-onset atrial fibrillation (odds ratio, 1.53; 95% confidence interval [CI], 1.08-2.18; p = 0.017) was identified as an independent risk factor for postoperative stroke. A total of 518 (17.2%) mortalities occurred within the mean postoperative follow-up period of eight ± two years. New-onset atrial fibrillation was associated with shorter survival (hazard ratio, 1.49; 95% CI, 1.22-1.81; p < 0.001) compared with patients with no atrial fibrillation.
Conclusions:
New-onset atrial fibrillation is a significant risk factor for long-term stroke and mortality after cardiac surgery. Close monitoring and treatment of this condition may be necessary to reduce the risk of postoperative stroke and mortality.
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