Abstract: Objective To investigate the effect of sufentanil on inflammatory cytokines and MDA of plasma in valve replacement surgery during cardiopulmonary bypass(CPB) . Methods Thirty adult patients undergoing valve replacement with cardiopulmonary bypass were randomly divided into 3 groups: GroupS1 (sulfentanil 3 μg/kg) ,GroupS2 (sulfentanil 5 μg/kg) , GroupS3 (sulfentanil 10 μg/kg) . Blood samples were taken before anesthesia(T1),5 min after opening the thorax(T2),30 min after aortic clamping (T3),2 h after aortic declamping (T4) ,and 24 h(T5)after the operation for determination of plasma levels of tumornecrosis factor (TNF-α) ,interteukin-6(IL-6)and MDA. The stage of ICU and the extubation time were recorded. Results Levels of TNF-α,IL-6 and MDA after the CPB in the 3 groups were significantly higher compared with T0 (P<0.01) . TNF-α (ng/L) ,IL-6 (ng/L)and MDA(mmol/L) levels at T2, T3 were significantly lower in GroupS2(atT2: TNF-α15.7±4.1, IL-6 116.5±18.2 and MDA 8.5±0.8,atT3:TNF-α22.8±3.6, IL-6 158.9±13.7 and MDA 10.2±1.3) than those in GroupS1(at T2: TNF-α 20.3±4.5、 IL-6 141.8±21.3 and MDA 10.6±0.9,at T3: TNF-α28.1±3.7、 IL-6 175.6±15.1 and MDA 12.5±1.4). TNF-α, IL-6 and MDA levels at T2,T3 were significantly lower in GroupS3 (at T2: TNF-α15.7±4.1、 IL-6 116.5±18.2 and MDA 8.5±0.8, at T3: TNF-α22.8±3.6、 IL-6 158.9±13.7 and MDA 10.2±1.3) than those in GroupS1. But levels of TNF-α, IL-6 and MDA in GroupS2 were not significantly different compared with those in GroupS3. The duration of stay in ICU and time of endotracheal extubation were significantly longer in patients of GroupS3(3.5±0.5)d, (29.3±3.0)h than those of GroupS1(2.2±0.5)d,(18.2±2.5)h andS2 (2.4±0.4)d,(19.3±2.8)h(P<0.05). Conclusion CPB leads to a proinflammatory response,as well as oxygen free radicals release. Larger dose sufentanil seemed to be effective in reducing CPB-induced inflammatory response and ischemic reperfusion injury,but the effect was not dependent on dose while sufentanil dose reaching some value,at the same time the duration of stay in ICU and time of endotracheal extubation were longer.
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