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Influence of left ventricular function and other parameters on early and late mortality following coronary bypass
Insights
Coronary bypass surgery outcomes depend on patient health before the procedure. Good left ventricular performance improves long-term survival, while surgical skill and vessel disease impact early mortality after bypass surgery.
Area of Science:
- Cardiology
- Cardiac Surgery
- Clinical Outcomes Research
Background:
- Coronary artery bypass grafting (CABG) is a critical intervention for coronary artery disease.
- Understanding factors influencing early and late mortality after CABG is essential for improving patient outcomes.
- Left ventricular (LV) function and coronary anatomy are key determinants of cardiac health.
Purpose of the Study:
- To compare preoperative left ventricular performance, coronary anatomy, and postoperative outcomes in patients surviving CABG versus those experiencing early or late death.
- To identify predictors of early and late mortality following CABG.
Main Methods:
- Retrospective analysis of 797 CABG survivors.
- Comparison of three groups: 66 controls (Group I), 45 early deaths (Group II), and 53 late deaths (Group III).
- Evaluation of preoperative left ventricular end-diastolic pressure, ejection fraction, mean circumferential fibre shortening rate, and wall motion abnormalities.
Main Results:
- Group I had significantly better preoperative LV parameters than Group III, but not Group II.
- Abnormal wall motion was less frequent in Group I compared to Groups II and III.
- Triple-vessel disease was more prevalent in early deaths (Group II) than controls (Group I).
- Perioperative myocardial infarction and low cardiac output syndrome were primary causes of early death.
- Late mortality was significantly higher in Group III due to myocardial infarction and heart failure compared to Group I.
Conclusions:
- Surgical expertise, preoperative ventricular performance, and triple-vessel disease are crucial for early mortality after CABG.
- Preoperative left ventricular performance is a primary determinant of late mortality following bypass surgery.
Abstract:
Left ventricular performance, coronary anatomy and postoperative clinical parameters of 66 control patients (group 1) randomly selected from 797 survivors of coronary bypass surgery were compared with those of 45 patients who died within 30 days of operation (group II) and 53 patients who died late (average, 22+/-2 mo) (group III). Average preoperative left ventricular end-diastolic pressure, ejection fraction and mean circumferential fibre shortening rate were significantly better in group I than in group III patients. These same parameters were not significantly different when group I was compared to group II. Abnormal wall motion was significantly less frequent in patients from group I than in patients from group II and III. Triple-vessel disease was present preoperatively in 40 (61%) controls compared with 37 (82%) early deaths (P = 0.021) and 35 (66%) late deaths (NS). The number of grafts placed per patient was not significantly different in the three groups. Perioperative myocardial in farction (MI) and low cardiac output syndrome were the commonest causes of early death. Late complications such as MI and heart failure occurred in 4 (6%) v; 15 (32%) (P = 0.0006) and 4 (6%) v. 27 (57%) (Pless than 0.0001) group I v. group III patients, respectively. Surgical expertise, preoperative ventricular performance and triple-vessel disease are important determinants of early mortality following bypass surgery and preoperative left ventricular performance is one of the most important determinants of late mortality,