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Optimal timing of abdominal aortic aneurysm repair after coronary artery revascularization
L H Blackbourne1, C G Tribble, S E Langenburg
1Department of Surgery, University of Virginia Health Sciences Center, Charlottesville.
Insights
Optimal timing for abdominal aortic aneurysm (AAA) repair after coronary artery bypass graft (CABG) is crucial. Repairing AAA simultaneously or within two weeks of CABG minimizes mortality risk and prevents late AAA rupture.
Area of Science:
- Cardiovascular Surgery
- Vascular Surgery
- Aortic Aneurysm Research
Background:
- Cardiac events are the leading cause of mortality following elective abdominal aortic aneurysm (AAA) repair.
- Preoperative coronary revascularization significantly lowers postoperative cardiac complications in patients undergoing AAA repair.
- Current practice often involves AAA repair within six months of coronary revascularization.
Purpose of the Study:
- To determine the optimal time interval for abdominal aortic aneurysm (AAA) repair subsequent to coronary artery revascularization.
- To assess the impact of timing on patient mortality and AAA rupture risk.
Main Methods:
- Retrospective review of patients undergoing asymptomatic AAA repair or scheduled repair within six months of coronary artery bypass graft (CABG).
- Data collected from March 1988 to October 1993.
- Analysis of mortality rates and causes of death based on the timing of AAA repair relative to CABG.
Main Results:
- No mortality was observed in patients undergoing AAA repair simultaneously or within 14 days of CABG (n=14).
- A significantly higher mortality rate (33%, 3 of 9) occurred in patients scheduled for AAA repair more than two weeks after CABG (p < 0.05).
- All fatalities in the delayed repair group were due to AAA rupture between 16 and 29 days post-CABG.
Conclusions:
- Elective AAA repair should be performed concurrently with or within two weeks of coronary artery revascularization.
- Delaying AAA repair beyond two weeks post-CABG increases the risk of aneurysm rupture and mortality.
- Simultaneous or early postoperative AAA repair does not elevate overall surgical risk.
Objective:
The authors ascertained the optimal timing of repair of an abdominal aortic aneurysm (AAA) after coronary artery revascularization.
Summary Background Data:
Cardiac events are the most common cause of death after elective repair of AAA. Preoperative coronary revascularization has significantly reduced postoperative cardiac complications after elective AAA repair. Currently, most patients undergo repair of asymptomatic AAA within 6 months after the coronary revascularization.
Methods:
The authors performed a retrospective review of patients who underwent repair or scheduled repair of an asymptomatic AAA within 6 months after coronary artery bypass graft (CABG) between March 1988 and October 1993.
Results:
There was no mortality in the group of patients (n = 14) who underwent repair of AAA simultaneously or within 14 days of coronary revascularization. In contrast, there was a significantly increased mortality rate of 3 of 9 (33%) in patients scheduled to undergo repair of the AAA more than 2 weeks after coronary revascularization (p < 0.05). All nonsurvivors died between 16 and 29 days after CABG, and died as a result of ruptured AAA.
Conclusion:
Elective AAA repair should be undertaken simultaneously or within 2 weeks of coronary artery revascularization because of an increased risk of postoperative AAA rupture seen after this time period. In addition, simultaneous or early postoperative AAA repair does not increase the overall operative risk.