Abstract: Objective To evaluate the effect of aortic root infusion of sufentanil on ischemia/reperfusion(I/R) injury in patients undergoing mitral valve replacement. Methods Sixty adult patients (ASA grade Ⅱ or Ⅲ, NYHA class Ⅰ or Ⅱ) of both sexes aged 18 y-65 y undergoing mitral valve replacement with cardiopulmonary bypass(CPB) were randomly divided into 2 groups(n=30): control group (group C) and sufentanil postconditioning group (group S). The patients received a bolus infusion of sufentanil(0.2 μg/kg) 5 min before aortic unclamping in group S, while the patients received equal volume of normal saline in group C. Blood samples were obtained from the right internal jugular vein for determination of plasma concentration of cardiac troponin I(cTnI) and activity of creatine kinase-MB(CK-MB) before induction of anesthesia(baseline) and at 4,8,24 h and 48 h after aortic unclamping. The hemodynamic parameters and duration of mechanical ventilation, lengths of intensive care unit (ICU) and postoperative hospital stay, the first 24 h postoperative inotropic score were recorded in both groups. Results Parameters of mean artery pressure (MAP), heart rate (HR), central venous pressure (CVP), cardiac output (CO), stroke volume (SV) were similar in both groups. The postoperative cTnI [(0.50±0.09),(0.39±0.08) μg/L] and CK-MB [(63±7), (61±7) U/L] release at 4, 8 h after aortic unclamping were lower in the sufentanil postconditioning patients compared with the group C [(0.70±0.11), (0.50±0.10) μg/L and (83±10),(75±7) U/L](P<0.05). Sufentanil postconditioned patients had shorter duration of mechanical ventilation [(12±4) h], length of ICU stay [(34±11) h] as well as postoperative hospital stay [(10±3) d] as compared to the group C [(14±4) h, (44±14) h,(13±4) d](P<0.05). The required inotropes were reduced in postconditioning group[(7.6±2.8) μg·kg-1·min-1] compared with the group C [(10.3±3.9) μg·kg-1·min-1] (P<0.05). Conclusions Aortic root infusion of sufentanil can attenuate myocardial I/R injury in patients undergoing mitral valve replacement with CPB, but its mechanism remains to be study.
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