23 research outputs found

    CSF Fistulae as a Complication Due to Insufficient Correction of Altered CSF Dynamics

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    Hydrocephalus is a complex phenomenon and incomplete knowledge about CSF dynamics often complicates our understanding and management of symptoms in children with altered fluid mechanisms. Patients with low-pressure symptoms are sometimes misdiagnosed, and complications occur in children with CSF fistulae that interfere with proper management of the hydrocephalic condition. This chapter will focus on CSF dynamics and alterations of intracranial pressure-volume relationships that lead to symptoms or cause difficulty in management. Potential complications and suggestions for management will be offered

    Another small step toward understanding hydrocephalus

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    Hydrocephalus In The H-Tx Rat: A Monogenic Disease?

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    The H-Tx rat is a genetic model of hydrocephalus for which there is a poor understanding of the mode of inheritance. Previous studies suggested a polygenic mode of inheritance but the breeding data to support this hypothesis have not been reported. In an attempt to clarify the hereditary mode we have analyzed the data from eight generations of H-Tx rats and four generations of cross-matings between H-Tx rats and Sprague-Dawley (SD) rats. In the H-Tx rat colony 113 of 129 random brother-sister matings (87.60%) produced hydrocephalic offspring, with males and females being equally affected. The overall incidence varied greatly with an average of 30.35%. In matings with more than three litters, all mating pairs yielded hydrocephalic pups. In cross-matings both hydrocephalic and normal H-Tx rats were mated with normal SD rats. No hydrocephalus was observed in the first generation of 124 pups (F1). Subsequent brother-sister matings of F1 animals generated hydrocephalic pups in the F2 generation with a lower incidence (4.67% in hydrocephalic HTx/SD matings and 5.11% in normal HTx/SD matings, respectively) than in the H-Tx rat colony (30.35%). Back-cross-matings between F2 rats and normal H-Tx rats yielded an incidence of hydrocephalus higher than that of the cross-matings but lower than that of the H-Tx colony. These data strongly suggest that the H-Tx rat is a homozygous carrier of an autosomal recessive hydrocephalus gene with incomplete penetrance. Furthermore, the data clearly rule out sex-linked and polygenic modes of inheritance and provide further insight with respect to genetic inheritance of hydrocephalus. (C) 2000 Academic Press

    Arachnoid cysts: a diffuse spinal fluid absorption abnormality?

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