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Risk factors for post-cardiopulmonary bypass vasoplegia in patients with preserved left ventricular function
A Mekontso-Dessap1, R Houël, C Soustelle
1Service de Chirurgie Thoracique et Cardiovasculaire, CNRS UPRES-A 7053, Centre Hospitalo-Universitaire Henri Mondor, Créteil, France.
The Annals of Thoracic Surgery
|June 1, 2001
Summary
Preoperative use of angiotensin-converting enzyme inhibitors and intravenous heparin are key predictors of vasodilatory shock after cardiopulmonary bypass. Identifying these risk factors can help manage patients undergoing cardiac surgery.
Area of Science:
- Cardiology
- Anesthesiology
- Critical Care Medicine
Background:
- Vasodilatory shock (VS) is a significant complication following cardiopulmonary bypass (CPB).
- The underlying pathophysiology of post-CPB VS is not fully understood.
- Identifying predisposing factors independent of ventricular function is crucial for patient management.
Purpose of the Study:
- To determine factors predisposing patients to vasodilatory shock after cardiopulmonary bypass.
- To identify risk factors independent of cardiac function.
Main Methods:
- A case-control study comparing 36 patients with post-CPB VS to 72 controls.
- Patients were matched for age, sex, operation date, and left ventricle ejection fraction.
- Both groups received the same anesthetic protocol.
Main Results:
- No significant differences in preoperative or intraoperative characteristics between groups.
- Preoperative use of angiotensin-converting enzyme inhibitors (ACEIs) and intravenous heparin were independent predictors of VS (RR 2.26 and 2.78).
- VS cases had longer ICU and hospital stays but similar early mortality.
Conclusions:
- Preoperative ACEI use and intravenous heparin are the sole independent risk factors for post-CPB VS.
- These risk factors are not influenced by age, gender, anesthetic protocol, or left ventricle ejection fraction.