Abstract
Primary spontaneous intracerebral hemorrhage (ICH) with secondary intraventricular hemorrhage (IVH) is an important clinical problem of which little is known. IVH and hydrocephalus are independent predictors of poor outcome in ICH. The aims of this study were, therefore, to establish a rat model of ICH with ventricular extension and investigate the occurrence of post-hemorrhagic chronic hydrocephalus and perihematomal tissue injury. Based on our previous rat model of IVH, we adjusted the injection coordinates and 200 μl autologous blood was stereotaxically infused into the right striatum (coordinates: 0.2 mm posterior, 2.2 mm lateral, and 5.0 mm depth to the bregma). At 24 h post-infusion, the rats produced reproducible hematoma and ventricle expansion, which closely mimics the ICH with ventricular extension in humans. Hematoma consequences and perihematomal tissue injury were evaluated on the acute phase. At 4 weeks, ventricular dilatation, brain tissue loss, hippocampus volume, and cortical thickness were measured with magnetic resonance imaging and neurocognitive function was assessed using the Morris water maze test. With blood infusion, the animals demonstrated brain edema, blood–brain barrier breakdown, and marked perihematomal tissue injury on the acute phase. At 4 weeks, the T2 images showed remarkable hydrocephalus and tissue loss, and the Morris water maze test revealed neurocognitive deficits. The present ICH with the ventricular extension rat model features characteristics of both ICH and IVH rat models, which could be used for extending our pathophysiological understanding of post-hemorrhagic chronic hydrocephalus and perihematomal tissue damage.
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Acknowledgments
We would like to thank Dr. Ya Hua from the University of Michigan for her professional comments on this research. This work was supported by grants 81070929 (Z.C) and 81271281 (Z.C) from the National Natural Science Foundation of China and 2014CB541606 (H.F) from the National Key Basic Research Development Program (973 Program) of China.
Conflict of Interest
Qianwei Chen, Jianbo Zhang, Jing Guo, Jun Tang, Yihao Tao, Lin li, Hua Feng, and Zhi Chen declare that they have no conflict of interest.
Compliance with Ethics Requirements
All institutional and national guidelines for the care and use of laboratory animals were followed.
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Chen, Q., Zhang, J., Guo, J. et al. Chronic Hydrocephalus and Perihematomal Tissue Injury Developed in a Rat Model of Intracerebral Hemorrhage with Ventricular Extension. Transl. Stroke Res. 6, 125–132 (2015). https://doi.org/10.1007/s12975-014-0367-5
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DOI: https://doi.org/10.1007/s12975-014-0367-5