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Risk factors for mortality in primary isolated coronary artery bypass grafting surgery
1Division of Cardiovascular Surgery, Department of Surgery, National Yang-Ming University School of Medicine, Taipei, Taiwan.
Insights
Emergency surgery, myocardial infarction history, peripheral artery occlusive disease (PAOD), and prolonged cardiopulmonary bypass (CPB) significantly increase mortality risk in coronary artery bypass grafting (CABG). Identifying these factors aids in improving CABG outcomes.
Area of Science:
- Cardiovascular Surgery
- Surgical Outcomes Research
- Public Health
Background:
- Improving surgical results in coronary artery bypass grafting (CABG) necessitates identifying mortality risk factors.
- This study focuses on primary isolated CABG procedures in a Taiwanese patient cohort.
Purpose of the Study:
- To identify significant risk factors associated with mortality in primary isolated CABG.
- To inform strategies for reducing mortality in CABG patients.
Main Methods:
- Retrospective review of 914 patient records from Veterans General Hospital-Taipei (1991-1995).
- Analysis of 18 clinical and 7 operative variables using univariate and multivariate methods.
- Identification of determinants of mortality in CABG surgery.
Main Results:
- Overall 30-day mortality was 3.4%; in-hospital mortality was 4.5%.
- Significant mortality determinants identified: emergency surgery, myocardial infarction history, peripheral artery occlusive disease (PAOD), and prolonged cardiopulmonary bypass (CPB).
- Emergency surgery patients faced the highest mortality risk.
Conclusions:
- Patients with a history of myocardial infarction, PAOD, or prolonged CPB undergoing emergency surgery face elevated mortality risk in CABG.
- Enhanced myocardial protection, surgical techniques, and postoperative care are crucial for high-risk CABG patients to reduce mortality.
Background And Purpose:
Identifying the risk factors for mortality in coronary artery bypass grafting (CABG) surgery is important to improve surgical results. The purpose of this study was to identify the risk factors for mortality in primary isolated CABG in a series of Taiwanese patients.
Methods:
Medical records of 914 patients who underwent primary isolated CABG surgery in Veterans General Hospital-Taipei during the period from January 1, 1991, to December 31, 1995, were reviewed. Eighteen clinical and seven operative variables were included in the univariate and multivariate analyses to identify the determinants of mortality in CABG surgery.
Results:
Thirty-one patients (3.4%) died within 30 days after surgery; 41 (4.5%) died during hospitalization for the procedure. After univariate and multivariate analyses, emergency surgery, history of myocardial infarction, concomitant peripheral artery occlusive disease (PAOD), and prolonged cardiopulmonary bypass (CPB) were found to be significant determinants of mortality in primary isolated CABG. Other variables, including age, sex, angina class, NYHA class, diabetes mellitus, the number of anastomoses, aortic cross-clamp time, stenosis of the left main coronary artery, the number of stenotic coronary arteries, history of congestive heart failure, and a left ventricular ejection fraction less than 35%, were not significant determinants of mortality. Patients undergoing emergency surgery were found to be at highest risk of mortality.
Conclusions:
Patients undergoing emergency surgery who had a history of myocardial infarction, concomitant PAOD, or prolonged CPB were at higher risk of mortality in CABG surgery. More comprehensive techniques in myocardial protection, surgical procedures, and postoperative care should be used in the treatment of high-risk patients to reduce mortality.