Abstract
Ventriculoatrial shunt, with a Holter valve, is commonly used in the management of hydrocephalus. In three cases clinical evidence of raised intracranial pressure was noted 1, 4, and 9 years after establishment of the shunt. During surgical exploration the resistance of the valve to a column of saline solution 450 mm. high was increased. It is suggested that if raised intracranial pressure is confirmed at operation and if cerebrospinal fluid flows freely through the catheters, then the resistance of the valve should be checked.
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