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[Myocardial infarction after coronary bypass surgery. Associated factors and prognosis]
A Dubost1, G De Gevigney, C Zambartas
1Service de cardiologie, hôpital cardiovasculaire Louis-Pradel, Lyon.
Insights
Perioperative myocardial infarction after coronary bypass surgery is linked to pre-existing heart conditions and longer surgery times. Patients experiencing this complication have significantly lower long-term survival rates.
Area of Science:
- Cardiology
- Cardiac Surgery
Context:
- Coronary bypass surgery (CABG) is a common procedure for coronary artery disease.
- Perioperative myocardial infarction (PMI) is a serious complication following CABG.
- Understanding PMI risk factors and prognosis is crucial for patient outcomes.
Purpose:
- To identify factors associated with perioperative myocardial infarction after coronary bypass surgery.
- To assess the medium-term prognosis of patients who experience PMI post-CABG.
Summary:
- A study of 470 patients undergoing CABG found PMI in 7.65%.
- Risk factors included crescendo angina, ECG abnormalities, poor coronary network, lower ejection fraction, incomplete revascularization, and longer bypass/clamping times.
- PMI patients faced higher acute complications and significantly reduced 5-year survival (76.5% vs 95.4%).
Impact:
- Identifies key predictors of PMI in CABG patients.
- Highlights the substantial negative impact of PMI on long-term survival.
- Informs clinical practice for risk stratification and management to improve outcomes after CABG.
Abstract:
This paper studies the factors associated with perioperative myocardial infarction after coronary bypass surgery and assesses the medium-term prognosis of these patients. Four hundred and seventy patients underwent coronary bypass surgery between January 1983 and December 1986. The appearance and persistence of pathological Q waves, absent on the preoperative ECG, was the unique criterion of perioperative infarction. This complication was observed in 36 patients (7.65%). A comparison of these patients with a random group of 144 of teh 434 patients without perioperative infarction showed that they had a higher incidence of crescendo angina (55% vs 21%; p less than 0.001), ST-T wave changes on the resting ECG (78% vs 46%; p less than 0.001) and poor distal left anterior descending network (33% vs 13%; p less than 0.001): in addition, the group with infarction had a lower left ventricular ejection fraction (0.58 vs 0.64, p less than 0.01), incomplete myocardial revascularisation procedures (58% vs 32%; p less than 0.01), longer cardiopulmonary bypass times (86 mn vs 69 mn; p less than 0.001) and longer aortic clamping times (44.5 mn vs 37.4 mn p less than 0.05). The acute phase of the perioperative infarct was characterised by a higher incidence of major cardiac complications such as low output states (30.5% vs 2.02%; p less than 0.001). The hospital mortality was higher in the infarct group (8.3% vs 2.01%) but this was not statistically significant. After an average follow-up of 44 +/- 3 months, the 5 year survival rate was 95.4 +/- 2.1 per cent in patients without infarction and 76.5 +/- 6.9 per cent in those with perioperative infarction (p less than 0.001).(ABSTRACT TRUNCATED AT 250 WORDS)