The aim of the study was to investigate whether repeated ischemic preconditioning or N-acetylcystein (NAC) prevents ischemic-reperfusion injury as determined by having favourable hemodynamic effects during reperfusion in canine livers. Methods: The control group (n = 10) underwent 60 minutes of hepatic ischemia followed by 180 minutes reperfusion. In the NAC group (n = 5) 150 mg kg-1 of NAC was administered intravenously before inducing ischemia. In the preconditioned group (n = 5) animals received ischemic preconditioning (10 minutes of ischemia followed by 10 minutes of reperfusion repeated three times) before clamping the portal triad. Results: 18 dogs survived the study period. One dog in the NAC group died due to circulatory failure unresponsive to inotropic drugs. The cardiac index and the intrathoracic blood volume index were significantly higher in the preconditioning group compared to the controls throughout the study period. Conclusions: Repeated ischemic preconditioning might improve hemodynamic parameters, whereas we were unable to find any significant differences between the groups regarding N-acetylcystein.
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