RESUMO
Objective To investigate the effects of pyrrolidine dithiocarbamate (PDTC) on plasma concentrations of proinflammatory cytokines and myocardial energy metabolism induced by cardiopulmonary bypass (CPB) .Methods Twelve healthy mongrel dogs of both sexes weighing 13.5-17.5 kg were randomly divided into 2 groups (n = 6 in each group) : PDTC group and control group. The animals were anesthetized with intraperitoneal 2.5% pentobarbital sodium 25 mg?kg-1, intubated and mechanically ventilated. In PDTC group PDTC 30 mg?kg-1 was given i.v. after tracheal intubation while in control group normal saline was given instead of PDTC. Aorta was clamped for 60 min and then undamped for 60 min reperfusion during CPB. Blood samples were taken before (baseline), 30 and 60 min after aortic clamping and 30 and 60 min after aortic unclamping for determination of plasma concentrations of TNF-? and IL-1?. Myocardial tissue was obtained before and 60 min after aortic clamping and 60 min after aortic unclamping for determination of myocardial content of adenine nucleotide (ATP, ADP, AMP, TAN, EC) and expression of ICAM-1 protein.Results Plasma TNF-? concentration was increased after aortic cross-clamping as compared to the baseline value before clamping in both groups but the TNF-? concentration was significantly lower in PDTC group than in control group (P