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Eur J Cardiothorac Surg 1999;15:340-345
© 1999 Elsevier Science NL

The heart produces but the lungs consume proinflammatory cytokines following cardiopulmonary bypass¹

^a Department of Cardiothoracic Surgery, University of Regensburg, Regensburg, Germany
^b Department of Anesthesiology, University of Regensburg, Regensburg, Germany

Received 26 October 1998; received in revised form 31 December 1998; accepted 13 January 1999.

Corresponding author. Tel.: +49-941-944-9801; fax: +49-941-944-9802; e-mail: andreas.liebold@klinik.uni-regensburg.de

Objective: Proinflammatory cytokines, such as interleukin-6 (IL-6), and soluble adhesion molecules, such as E-selectin, may play an important role in patient response to cardiopulmonary bypass (CPB). We sought to define whether the heart and the lungs serve as important sources of these inflammatory mediators under clinical conditions of myocardial revascularization using CPB and cardioplegic arrest. Methods: Plasma levels of IL-6 and E-selectin were measured in coronary sinus (CS), arterial, pulmonary arterial (PA) and left atrial (LA) blood samples taken from 12 consecutive patients (68.3±11 years; five females) undergoing coronary artery bypass grafting (CABG). Blood samples were collected preoperatively, after reperfusion, and 1, 6, 12 and 18 h following surgery. CS and LA blood was drawn using transcutaneous catheters. PA artery blood was obtained through a Swan–Ganz catheter. Cytokine levels were determined by standard enzyme linked immunosorbent assay (ELISA) technique. Results: A mean of 3.8±1 coronary anastomoses were performed. The CPB time and aortic X-clamp time were 91±15 and 45±10 min, respectively. IL-6 levels increased significantly after CPB and peaked 6 h postoperatively. There was also a significant increase of E-selectin levels with an onset at 1 h and a peak at 12 h postoperatively. At all time points the IL-6 and E-selectin concentrations were significantly higher in the CS than in arterial blood. In contrast, the levels of both mediators measured in the LA were significantly lower than those in the PA. Conclusion: The reperfusion of ischemic myocardium during CABG results in a significant increase in plasma levels of IL-6 and E-selectin. Our data indicate that the myocardium, but not the lungs, is a predominant source of IL-6 and E-selectin release following CPB. The lungs may consume rather than release those mediators during reperfusion. Not the CPB per se, but the myocardial ischemia seems to be crucial in the pathogenesis of the inflammatory response observed following open heart surgery.

Key Words: Interleukin-6 • E-selectin • Coronary sinus • Inflammatory response • Coronary artery bypass grafting

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