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Risk factors for intermediate-term survival after coronary artery bypass grafting
S C Gardner1, G K Grunwald, J S Rumsfeld
1Division of Cardiac Research, Denver Department of Veterans Affairs Medical Center, Colorado 80220, USA.
Insights
Risk factors for intermediate-term mortality after coronary artery bypass grafting differ significantly from short-term risks. Noncardiac conditions like impaired functional status and COPD are key predictors of longer-term survival post-CABG.
Area of Science:
- Cardiovascular Surgery
- Outcomes Research
- Health Services Research
Background:
- Established risk factors for short-term mortality after coronary artery bypass grafting (CABG).
- Limited understanding of risk factors influencing intermediate-term mortality post-CABG.
Purpose of the Study:
- To identify and compare risk factors for intermediate-term versus short-term mortality following CABG.
- To inform preoperative risk assessment and patient counseling.
Main Methods:
- Analysis of outcomes for 11,815 patients undergoing CABG within the Department of Veteran Affairs.
- Utilized Cox proportional hazards regression models to determine risk factors.
- Explicit comparison of risk factor effects during short-term and intermediate-term periods.
Main Results:
- Significant differences observed in risk factor sets for intermediate-term versus short-term mortality.
- Noncardiac variables (impaired functional status, COPD, renal dysfunction) were major predictors of intermediate-term mortality.
- Cardiac-related variables (previous heart operation, severe angina, prior myocardial infarction, intraaortic balloon pump use) were more impactful for short-term mortality.
Conclusions:
- Identified risk factors for intermediate-term mortality can enhance preoperative risk assessment and patient counseling.
- Clinicians must recognize the significant role of noncardiac variables in predicting intermediate-term mortality after CABG.
Background:
Risk factors for short-term mortality after coronary artery bypass grafting are well established, but little is known about risk factors for intermediate-term mortality.
Methods:
We analyzed the outcomes of 11,815 patients undergoing coronary artery bypass grafting in one of the 43 cardiac surgery programs of the Department of Veteran Affairs. Risk factors for intermediate- and short-term mortality were determined using Cox proportional hazards regression models. Effects of risk factors during these two periods were explicitly compared.
Results:
We found important differences in mortality risk-factor sets between the intermediate- and short-term periods after coronary artery bypass grafting. The majority of predictors of intermediate-term mortality were noncardiac-related variables, whereas the majority of predictors of short-term mortality were cardiac-related variables. Impaired functional status, chronic obstructive pulmonary disease, and renal dysfunction had greater effects in the intermediate-term period. Previous heart operation, angina class III or IV, previous myocardial infarction, and preoperative use of an intraaortic balloon pump had greater effects in the short-term period.
Conclusions:
The risk factors for intermediate-term mortality identified in this study can augment preoperative risk assessment and counseling of patients. Clinicians should be aware of the importance of noncardiac-related variables as predictors of mortality in the intermediate-term period after coronary artery bypass grafting.
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