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Incidence, risk, and outcome of reintervention after aortocoronary bypass surgery
Insights
Repeat procedures after coronary artery bypass grafting are common. While reintervention has higher mortality, it offers symptom relief and does not diminish long-term survival benefits from the initial bypass operation.
Area of Science:
- Cardiovascular Surgery
- Interventional Cardiology
- Clinical Outcomes Research
Background:
- Coronary artery bypass grafting (CABG) is a common treatment for coronary artery disease.
- Long-term patency of bypass grafts can decline, necessitating reintervention.
- Understanding outcomes of reintervention is crucial for patient management.
Purpose of the Study:
- To evaluate the outcomes of reintervention in patients who underwent their first isolated aortocoronary bypass operation.
- To assess the impact of reintervention on survival and symptomatic improvement.
- To identify factors influencing survival after initial bypass and subsequent reintervention.
Main Methods:
- Retrospective analysis of 1041 patients undergoing first isolated CABG.
- Follow-up for a mean of 7.5 years, documenting reinterventions (repeat bypass, angioplasty).
- Statistical analysis including survival probability and stepwise multivariate analysis.
Main Results:
- Reintervention was required in 12% of patients.
- Procedure-related mortality was higher during reintervention (5.6%) compared to primary operation (1.2%).
- Survival rates were similar between patients with and without reintervention; survival correlated with left ventricular function and vascular disease extent, not reintervention itself. Symptomatic improvement was high (89%) in survivors.
Conclusions:
- Repeat procedures are frequently necessary after CABG.
- Reintervention provides significant symptomatic relief without compromising long-term survival.
- Left ventricular function and extent of vascular disease are key predictors of survival post-CABG.
Abstract:
Reintervention was required in 123 (12%) individuals during a follow up (mean 7.5 years, range 5-14.5) of 1041 patients with consecutive, isolated, first aortocoronary bypass operations. In 89 patients the intervention was a repeat bypass operation, in 24 it was angioplasty, and 10 had both. Procedure related mortality was significantly higher at reintervention (5.6%) than at the primary operation (1.2%). Survival probability after a single bypass procedure was 90% at six years and 82(3)% at nine years. Corresponding figures six and nine years after reintervention were 89(6)% and 87(7)% respectively. Stepwise multivariate analysis showed that survival was significantly correlated with left ventricular function (rate ratio 1.82) and with extent of vascular disease (rate ratio 1.80) but not with reintervention (rate ratio 1.45). Symptomatic improvement occurred in 89% of the survivors with or without reintervention. Repeat procedures are often necessary after coronary artery bypass grafting but they appear to provide appreciable relief of symptoms without reducing any long term improvement in survival brought about by the original operation.