Retrograde Cerebral Perfusion Results in Better Perfusion to the Striatum Than the Cerebral Cortex During Deep Hypothermic Circulatory Arrest: A Microdialysis Study

It remains controversial whether contemporary cerebral perfusion techniques, utilized during deep hypothermic circulatory arrest (DHCA), establish adequate perfusion to deep structures in the brain. This study aimed to investigate whether selective antegrade cerebral perfusion (SACP) or retrograde cerebral perfusion (RCP) can provide perfusion equally to various anatomical positions in the brain using metabolic evidence obtained from microdialysis. Eighteen piglets were randomly assigned to 40min of circulatory arrest (CA) at 18 degrees C without cerebral perfusion (DHCA group, n=6) or with SACP (SACP group, n=6) or RCP (RCP group, n=6). Microdialysis parameters (glucose, lactate, pyruvate, and glutamate) were measured every 30min in cortex and striatum. After 3h of reperfusion, brain tissue was harvested for Western blot measurement of -spectrin. After 40min of CA, the DHCA group showed marked elevations of lactate and glycerol and a reduction in glucose in the microdialysis perfusate (all P<0.05). The changes in glucose, lactate, and glycerol in the perfusate and -spectrin expression in brain tissue were similar between cortex and striatum in the SACP group (all P>0.05). In the RCP group, the cortex exhibited lower glucose, higher lactate, and higher glycerol in the perfusate and higher -spectrin expression in brain tissue compared with the striatum (all P<0.05). Glutamate showed no difference between cortex and striatum in all groups (all P>0.05). In summary, SACP provided uniform and continuous cerebral perfusion to most anatomical sites in the brain, whereas RCP resulted in less sufficient perfusion to the cortex but better perfusion to the striatum.