[Effect of reperfusion leukocyte-depleted blood on canine myocardial energy metabolism balance during cardiopulmonary bypass].

ABSTRACT

OBJECTIVE: To investigate the impact of myocardial energy metabolism of canine reperfused with leukocyte-depleted blood during cardiopulmonary bypass (CPB). METHODS: Eighteen adult healthy dogs undergoing CPB were randomly divided into 3 groups the control group (group C, n=6), whole blood (group W, n=6) and the experimental group (group L, n=6) with use of the leukocyte depletion filter (LDF) on the bypass circuit. The contents of adenine nucleotide, superoxide dismutase (SOD), glutathione peroxidase (GSH-PX), myeloperoxidase (MPO), malondialdehyde (MDA) and mitochondrial swelling of myocardia were determined respectively before cross-clamping, at 40 min and 60 min after aortic cross-clamping (AC), 30 min and 60 min after declamping (DC) during CPB. RESULTS: Reperfused with leukocyte-depleted blood by LDF connected with bypass circuit, the dog hearts of group L at 60 min after AC, 30 min and 60 min after DC were much better in the recovery of myocardium energy metabolism, higher in contents of myocardium SOD and GSH-PX than those in group C and W (P < 0.01). The myocardium MPO, MDA and mitochondrial swelling degree at 60 min after AC, 30 min and 60 min after DC were distinctly lower in group L than those in group C and W (P < 0.01). CONCLUSION: Myocardium has serious energy exhaustion and deteriorated metabolism during CPB. Myocardial mitochondrial structure and function can be protected and myocardial energy depletion can be reduced by infusion of leukocyte-depleted blood to the heart before DC, which can distinctly attenuate myocardial ischemia/reperfusion injury.