• Johannes Boehm, Katharina Hauner, Joachim Grammer, Wulf Dietrich, Stefan Wagenpfeil, Siegmund Braun, Rüdiger Lange, and Robert Bauernschmitt.
• Klinik fuer Herz- und Gefaesschirurgie, Deutsches Herzzentrum Muenchen, Technische Universitaet Muenchen, Lazarettstr 36, D-80636 Munich, Germany. johannesfboehm@googlemail.com
• Eur J Cardiothorac Surg. 2011 Jul 1;40(1):e50-4.

ObjectiveCardiac surgery using cardiopulmonary bypass (CPB) initiates an inflammatory response that shows a wide inter-individual range and determines postoperative morbidity. Previous research suggests that genetic diversity contributes to individual susceptibility to perioperative trauma and stress. Nevertheless, the genetic triggering of the tumor necrosis factor-alpha (TNF-α) release remains unclear. We tested two genetic single-nucleotide polymorphisms (SNPs) from the promoter region of the TNF-α gene for associations with perioperative TNF-α level after CPB.MethodsWe prospectively included 122 patients, who underwent elective coronary artery bypass grafting (CABG). Patients were genotyped for TNF-α -863 C/A (rs1800630) and TNF-α -308 G/A (rs1800629). Plasma level of TNF-α was obtained preoperatively, at the end of CPB, 6h postoperatively, and on the first postoperative day (POD).ResultsDemographic characteristics and operative data revealed no significant differences between the different genotypes. Multiple linear regression analyses revealed significant associations for the TNF-α 863 C/A polymorphism: the major -863 CC variant was associated with higher TNF-α level preoperatively (p = 0.003), after CPB (p = 0.005), and 6h postoperatively (p = 0.010), independently from CPB time, left ventricle (LV) function and age. Contrarily, the AA allele had lower TNF-α level preoperatively (p = 0.008), after surgery (p = 0.024) and 6h postoperatively (p = 0.001). For the TNF-α 308 G/A polymorphism, only few significant associations could be observed: -308 GG carriers were associated with lower TNF-α level immediately after CPB (p = 0.020), whereas 308 AA carriers were significantly associated with elevated TNF-α level preoperatively (p = 0.032) and immediately after CPB (p = 0.05). No heterozygote variant of both SNPs revealed any significant associations with perioperative TNF-α level.ConclusionsThe current study suggests that the major -863 CC variant determines elevated TNF-α level preoperatively and throughout the postoperative course after CPB.Copyright © 2011 European Association for Cardio-Thoracic Surgery. Published by Elsevier B.V. All rights reserved.

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