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[Emergent coronary bypass grafting after acute myocardial infarction]
1Department of Cardiovascular Surgery, Kameda Medical Center, Chiba, Japan.
Insights
Emergent coronary bypass graft surgery (ECABG) after acute myocardial infarction (AMI) has a 20.8% hospital mortality. Preoperative shock and using only saphenous vein grafts (SVG) are linked to higher death rates and poorer long-term outcomes.
Area of Science:
- Cardiovascular Surgery
- Cardiac Surgery Outcomes
- Myocardial Infarction Management
Context:
- Emergent coronary artery bypass graft surgery (ECABG) is a critical intervention for acute myocardial infarction (AMI).
- Understanding factors influencing ECABG outcomes is essential for improving patient survival and recovery.
- This study reviews ECABG cases performed between 1987 and 1995 to identify key prognostic indicators.
Purpose:
- To investigate factors affecting short- and long-term results of ECABG following AMI.
- To identify predictors of hospital mortality and long-term survival after ECABG.
- To evaluate the impact of specific surgical techniques and patient characteristics on ECABG outcomes.
Summary:
- A review of 48 patients undergoing ECABG after AMI revealed a 20.8% hospital mortality rate.
- Preoperative shock, type of infarction, and exclusive use of saphenous vein grafts (SVG) were significantly associated with increased hospital death.
- Long-term follow-up showed that SVG alone was linked to decreased survival and event-free rates, while internal thoracic artery use improved outcomes in select patients.
Impact:
- Identifies preoperative shock and SVG-only use as negative prognostic factors for ECABG.
- Suggests that non-Q-wave infarction patients without cardiogenic shock can undergo ECABG relatively safely.
- Highlights the benefit of internal thoracic artery use in ECABG for improved long-term survival and reduced coronary events, particularly in patients without cardiogenic shock.
Abstract:
In an attempt to examine various factors affecting the short- and long-term results of emergent coronary bypass graft surgery (ECABG) after an acute myocardial infarction (AMI), all patients undergoing ECABG without associated procedures at our institution from January 1987 to July 1995 were reviewed. Forty eight patients underwent ECABG after AMI. The hospital mortality rate was 20.8%. The charts of these patients were reviewed with regard to sex, age, preoperative shock, location of AMI, type of infarction, coronary anatomy, presence of postinfarction angina, technique of myocardial preservation, use of saphenous vein graft (SVG) alone, time from AMI to operation and short and long-term outcome. Univariate analyses showed that three factors were significantly associated with increased hospital death: preoperative shock (p = 0.001), type of infarction (p = 0.01), use of SVG alone (p = 0.003). Follow-up was 100% complete at a mean time of 36.4 +/- 4.8 months. Of all patients 77.0% were alive at 5 years after operation. Univariate comparison of survival curves and coronary event free curves showed that use of SVG alone was associated with decreased survival (p = 0.0009) and event free (p = 0.02) rates. Patients with non-Q-wave infarction and without cardiogenic shock may undergo ECABG relatively safely at any time. The use of internal thoracic artery at ECABG without cardiogenic shock does not increase hospital mortality and improves both long-term survival and freedom from coronary events.