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In some adult patients with dementia and/or disorders of gait, symptoms have been related to communicating hydrocephalus: isotope encephalography demonstrates an associated CSF circulation/absorption abnormality. A simple manometric test involving pressure readings after removal and re-introduction of CSF is described. It has shown a distinctive pattern, correlating with radio-isotope studies in 14 patients, in the separation of this condition from other causes of adult dementia. The test also gave useful information in 2 of these patients concerning patency of the ventriculoatrial shunt apparatus.
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Braham et al. (2008) studied this question.
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