Related Experiment Videos
Reoperative myocardial revascularization: an analysis of 458 reoperations and 2645 single operations
M Schmuziger1, J T Christenson, J Maurice
1Cardiovascular Unit, Hôpital de la Tour, Geneva, Switzerland.
Insights
Reoperative coronary artery bypass grafting (CABG) is effective but carries higher operative mortality and morbidity than primary CABG. Outcomes worsen with shorter intervals between surgeries, unstable angina, or poor left ventricular function.
Area of Science:
- Cardiovascular Surgery
- Cardiac Surgery Outcomes
- Coronary Artery Bypass Grafting
Background:
- Primary and reoperative coronary artery bypass grafting (CABG) patient cohorts were compared over a 9-year period.
- Reoperative patients presented with similar demographics but higher rates of clinical instability (NYHA class 4).
- Internal mammary artery (IMA) use was significantly lower in primary CABG patients who later required reoperation compared to primary CABG alone.
Purpose of the Study:
- To compare outcomes of primary versus reoperative coronary artery bypass grafting.
- To identify predictors of perioperative mortality in both primary and reoperative CABG.
- To evaluate the long-term effectiveness of reoperative CABG.
Main Methods:
- Analysis of 2645 primary CABG and 458 reoperative CABG patients.
- Comparison of preoperative risk factors, intraoperative variables, and postoperative outcomes.
- Assessment of long-term survival and cardiac event-free rates after reoperative CABG.
Main Results:
- Reoperative CABG had higher operative mortality (9.2% vs. 2.3%) and morbidity (e.g., myocardial infarction, ventilatory support).
- Mortality risk increased significantly when reoperation occurred within 1 year of the initial surgery (28% vs. 8.4%).
- Predictors of mortality included emergency operation, NYHA class 3-4, poor left ventricular function, and left main stem stenosis in reoperative cases.
Conclusions:
- Reoperative CABG is a viable option, offering long-term survival and symptom improvement.
- Increased operative risk in reoperative CABG is associated with clinical instability, left main stem stenosis, and impaired left ventricular function.
- Optimizing IMA graft utilization in initial surgeries may impact reoperation outcomes.
Abstract:
A consecutive series of 2645 patients underwent primary coronary bypass grafting while 458 patients underwent reoperative bypass during a 9-year period. The mean age (61 years), sex distribution (83% men) and preoperative risk factors were identical in the two groups. Significantly more patients belonged to New York Heart Association (NYHA) class 4 and were clinically unstable in the reoperative group (P < 0.001). The internal mammary artery was used in 43% of the single operation group but in only 23% of patients who subsequently required reoperation (P < 0.001). In reoperations 61% of the patients had an internal mammary artery graft (P < 0.001). The overall operative mortality rate for single operation was 2.3% (62/2645) versus 9.2% (42/458) for reoperations. Patients with a reoperative interval of more than 1 year had a 8.4% mortality rate, compared with 28% in those reoperated on 1 year or less after the initial operation (P < 0.01). Preoperative myocardial infarction, intra-aortic balloon pump insertion, prolonged ventilatory support and ventricular arrhythmias were all prevalent after reoperations (all P > 0.001), while postoperative myocardial infarctions and re-sternotomy for bleeding did not differ between the groups. Emergency operation, preoperative NYHA class 3-4 and poor left ventricular function were predictors of perioperative mortality in both groups. Left main stem stenosis was an added factor in the reoperative group. After reoperation 93% of the hospital survivors were alive at 5 years after surgery; the cardiac event-free rate was 59% and > 90% of the patients showed improvement of their NYHA class during the follow-up. Reoperative coronary artery bypass grafting is effective, but has an increased operative mortality and morbidity, especially in patients with unstable angina, left main stem stenosis and poor preoperative left ventricular function.