Communicating hydrocephalus in adult rats with kaolin obstruction of the basal cisterns or the cortical subarachnoid space

Experimental Neurology
J LiM L Walker

Abstract

Communicating hydrocephalus (CH) occurs frequently, but clinically-relevant animal models amenable to diagnostic imaging and cerebrospinal fluid shunting are not available. In order to develop and characterize models of subarachnoid space (SAS) obstruction at the basal cisterns (BC) or cerebral convexities (CX), 25% kaolin was injected in adult female Sprague-Dawley rats following halothane anesthesia; intact- or saline-injected animals served as controls. For BC animals (n=28 hydrocephalics, n=20 controls), an anterior approach to the C1-clivus interval was employed and 30 microl of kaolin or saline was injected. For CX injections (n=13 hydrocephalics, n=3 controls), 50-60 microl of kaolin was injected bilaterally after separating the partitions in the SAS. In BC-injected rats, kaolin was observed grossly in the basal cisterns but not in the cisterna magna or at the foramina of Luschka, indicating that communicating (or extra-ventricular)--not obstructive--hydrocephalus had been induced. Following ketamine/xylazine anesthesia, magnetic resonance imaging (MRI) of gadolinium injected into the lateral ventricle also demonstrated CSF flow from the foramina of Luschka. MRI also revealed that ventriculomegaly progressed steadily in ...Continue Reading

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