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Relationship Between Leukocyte Kinetics and Behavioral Tests Changes in the Inflammatory Process of Hemorrhagic Stroke Recovery

In this study, we investigated the inflammatory response to hemorrhagic stroke (HS) as the main mechanism of brain functional recovery. Sprague-Dawley rats (n = 24) underwent surgery with sterile saline (control group, n = 12) and collagenase IV-S (stroke group, n = 12) being injected into the right striatum. White blood cell analysis, histological and immunohistological examination of the brain slices, as well as densitometric analysis of polymorphonuclear and microglial cells/macrophages were correlated with behavioral tests, and the data were subjected to appropriate statistical processing. The results indicate a strong correlation between polymorphonuclear and mononuclear changes in the blood and the zone of hemorrhagic stroke with behavioral tests of functional brain recovery. We propose that the inflammatory response is determined by kinetics of polymorphonuclear and mononuclear cells in both the blood and the hemorrhagic stroke zone. Kinetics of these cells is followed by the restoration of functions, and the maximum functional recovery is observed by the time polymorphonuclear and mononuclear stages have completed. With the development of inflammation and leukocyte kinetics, it is possible to predict functional recovery of hemorrhagic stroke. Improvement of the degree and rate of hemorrhagic stroke functional recovery may be achieved by therapeutic interventions into the inflammatory mechanisms influencing polymorphonuclear and mononuclear cell kinetics.