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Cytokine and lipid mediator blood concentrations after coronary artery surgery
1Service d'Anesthésie Réanimation Chirurgicale, Centre Hospitalier Universitaire Dupuytren, Limoges, France.
Insights
Cytokine and lipid mediator levels correlate with post-CABG complications like cardiovascular dysfunction and lung injury. These inflammatory markers may predict adverse outcomes after coronary artery bypass grafting (CABG) with extracorporeal circulation (ECC).
Area of Science:
- Biomedical Science
- Cardiovascular Research
- Inflammation Biology
Background:
- Coronary artery bypass grafting (CABG) with extracorporeal circulation (ECC) can lead to postoperative complications.
- The role of inflammatory mediators in these complications requires further elucidation.
Purpose of the Study:
- To investigate the association between specific cytokines and lipid mediators and complications following CABG with ECC.
- To determine if these mediators correlate with hemodynamic parameters and organ function post-surgery.
Main Methods:
- 32 patients undergoing CABG with ECC were studied.
- Hemodynamic measurements and blood samples were collected pre- and post-ECC, and at 6 and 24 hours postoperatively.
- Coagulation, pulmonary, and cardiovascular functions were assessed.
Main Results:
- Elevated interleukin-8 (IL-8) levels were linked to cardiovascular dysfunction.
- Platelet-activating factor (PAF) and decreased PAF acetylhydrolase activity (AHA) were associated with moderate cardiovascular dysfunction.
- Severe lung injury correlated with altered levels of PAF, prostaglandins, and thromboxane B2, while IL-6 was linked to moderate lung injury and impaired hemostasis.
Conclusions:
- Aberrant levels of cytokines and lipid mediators are observed in patients with pulmonary, cardiovascular, or hemostasis dysfunction post-cardiopulmonary bypass.
- The precise relationship between these mediator changes and inflammatory response-induced complications warrants further investigation.
Unlabelled:
This study investigates whether increased levels of cytokines and lipid mediators may be associated with complications after coronary artery bypass grafting (CABG) with extracorporeal circulation (ECC). Hemodynamic measurements and blood samples were obtained in 32 patients before and after the end of ECC and at the 6th and the 24th postoperative hours. Coagulation and pulmonary and cardiovascular functions were specifically assessed postoperatively at the same time. Patients with cardiovascular dysfunction had higher interleukin 8 (IL-8) levels. Higher platelet-activating factor (PAF) and decreased PAF acetylhydrolase activity (AHA, the enzyme that inactivates PAF) levels were found in patients with moderate cardiovascular dysfunction. Interleukin 6 (IL-6), IL-8, and AHA levels correlated with most hemodynamic parameters and creatine phosphokinase myocardial band levels obtained after surgery. Patients with severe lung injury had lower PAF, 6-keto prostaglandin (Pg)F1alpha, and PgE2 levels and higher thromboxane (Tx) B2 concentrations compared with patients without lung injury. Increased IL6 levels were only associated with moderate lung injury. Impaired hemostasis was associated with higher IL6 levels. AHA, IL-6, and IL-8 seem to be associated with cardiovascular dysfunction. The IL-6 blood levels and the ratio of TxB2/6 keto-PgF1alpha blood levels are increased during post-CABG lung injury. These results identify an association between specific post-CABG complications and the systemic inflammatory response. The clinical significance of this association remains to be evaluated.
Implications:
Patients with pulmonary, cardiovascular, or hemostasis dysfunction after cardiopulmonary bypass demonstrate aberrancies in a variety of cytokines and lipid mediators in arterial blood or plasma. The relationship between these findings and inflammatory response-induced complications remains to be determined.