ABSTRACT
Objective:To determine the protective effect of cardio-pulmonary bypass(CPB) with autologous lung as oxygenator on CPB-relative inflammatory response.Methods:Twelve adult mongrel dogs were randomly divided into control group and study group.Cardiopulmonary bypass (CPB) using a membrane oxygenator (control group) or using the autologous lung (study group) for gas exchange was performed for 120 min in an alternating series of 12 mongrel dogs with the heart arrested for 90 min by crystalloid cardioplegia and 30 min reperfusion.The blood samples were collected at the same time point of pre-operation(T1),60 min of cardiopulmonary bypass(T2),and 1 hour(T3),2 hours(T4) after cardiopulmonary bypass. Plasma concentration of IL-6,IL-10,TNF-α were detected with ELISA.Results:The plasma levels of IL-6,IL-8,IL-10,TNF-α in each group were significantly increased at T2,T3,T4.The plasma levels of IL-6,IL-8 and TNF-α in study group were significantly lower than in the control group at T2,T3,T4.The plasma levels of IL-10 in study group were significantly higher than the levels in control group at T2,T3,T4.Conclusion:This study indicates that extracorporeal circulation with autologous lung as oxygenator could reduce the increased amplitude of plasma levels of TNF-α,IL-6 and IL-8 whereas enhance the increased amplitude of the plasma IL-10 levels that result from CPB.In other word,extracorporeal circulation with autologous lung as oxygenator possesses the effect to regulate inflammatory cytokine balance and down-regulate CPB-relative inflammatory response.