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Cytokine Responses in Low-Risk Coronary Artery Bypass Surgery
Minxin Wei1, Pekka Kuukasjärvi, Jari Laurikka
1Division of Cardiovascular Surgery, Tampere University Hospital, Tampere, Finland
Insights
Coronary artery bypass surgery (CABG) elevates inflammatory cytokines like IL-6 and IL-8. These elevated cytokine levels are linked to postoperative cardiac dysfunction, impacting myocardial function after surgery.
Area of Science:
- Cardiology
- Immunology
- Surgical Research
Background:
- Inflammatory cytokines are linked to myocardial dysfunction, heart failure, and sepsis.
- Understanding cytokine response post-cardiac surgery is crucial for managing outcomes.
Purpose of the Study:
- To investigate if cytokine levels increase after coronary artery bypass surgery (CABG).
- To determine the association between elevated cytokines and postoperative cardiac dysfunction.
Main Methods:
- Studied 20 male patients undergoing elective CABG with cardiopulmonary bypass.
- Measured plasma levels of TNF-alpha, IL-6, IL-8, and IL-10 at multiple time points.
- Assessed postoperative cardiac function using CK-MB levels and hemodynamic data.
Main Results:
- Plasma levels of IL-6, IL-8, and IL-10 significantly increased after myocardial reperfusion.
- Elevated IL-6 and IL-8 levels post-reperfusion correlated with higher peak CK-MB values.
- Higher IL-6 and IL-8 levels were associated with a trend towards lower cardiac index.
Conclusions:
- Confirms elevated levels of IL-6, IL-8, and IL-10 following CABG.
- Suggests that increased systemic pro-inflammatory cytokines are partially associated with postoperative myocardial dysfunction.
Abstract:
Inflammatory cytokines have been implicated in myocardial function, severe congestive heart failure and sepsis. The present study tested the hypothesis that cytokine levels are elevated after low-risk coronary artery bypass surgery (CABG), and that they may be associated with postoperative cardiac dysfunction. Twenty male patients undergoing elective CABG in cardiopulmonary bypass (CPB) were studied. Plasma levels of tumor necrosis factor-alpha (TNF-alpha), interleukin (IL)-6, IL-8, and IL-10 were measured before anesthesia induction, 5 minutes after, and 1, 4, and 20 hours after reperfusion to the myocardium. Levels of the MB isoenzyme of creatine kinase (CK-MB) were measured postoperatively. Hemodynamic data were also recorded. Myocardial ischemia was followed by an increase in the plasma levels of IL-6, IL-8, and IL-10. The duration of IL-6 response lasted throughout the postoperative period studied. Plasma cytokine levels at 1 hour after reperfusion correlated with the maximum CK-MB value (IL-6, r = 0.587, p < 0.01; IL-8, r = 0.460, p < 0.05; IL-10, r = 0.570, p < 0.05). Higher plasma IL-6 and IL-8 levels after reperfusion tended to be linked with lower cardiac index. The present results confirm that the levels of inflammatory cytokines IL-6, IL-8, and IL-10 are elevated after CABG. Increased systemic pro-inflammatory cytokine levels were partially associated with postoperative myocardial dysfunction.