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Lethal mesenteric ischaemia after cardiopulmonary bypass: a common complication?
R V Venkateswaran1, S C Charman, M Goddard
1Department of Cardiothoracic Surgery, Papworth Hospital NHS Trust, Cambridge, UK.
Summary
Acute mesenteric ischaemia (AMI) occurs in 0.49% of patients after cardiopulmonary bypass (CPB). Risk factors include peripheral vascular disease, IABP use, and renal failure, but not diabetes or hypertension.
Area of Science:
- Cardiovascular Surgery
- Gastrointestinal Surgery
- Critical Care Medicine
Background:
- Acute mesenteric ischaemia (AMI) is a rare but serious complication following cardiac surgery requiring cardiopulmonary bypass (CPB).
- Understanding the incidence and associated factors of AMI post-CPB is crucial for improving patient outcomes.
Purpose of the Study:
- To determine the incidence of AMI following CPB.
- To identify demographic, clinical, and operative factors associated with the development of AMI after CPB.
Main Methods:
- Retrospective review of autopsy reports from 1994-2000.
- Identified 52 cases of AMI post-cardiac surgery.
- Matched 208 controls and used conditional logistic regression for analysis.
Main Results:
- AMI incidence was 0.49% among 11,202 patients undergoing CPB.
- Significant associations with AMI included peripheral vascular disease, intra-aortic balloon pump (IABP) use, post-operative renal failure, specific operation types (e.g., major cardiac), emergency surgery, smoking, and longer CPB/cross-clamp times.
- Diabetes and hypertension were not significantly associated with AMI.
Conclusions:
- AMI is a significant factor in mortality following CPB, occurring in 11% of deaths.
- Key risk factors for AMI post-CPB include pre-existing vascular disease, IABP use, renal complications, and prolonged CPB duration.
- The study highlights specific risk factors, differentiating them from general vascular disease risk factors.