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Evaluation of Surgically Treated Hydrocephalus by Radionuclide Clearance Studies of the Cerebrospinal Fluid Shunt

A simple radionuclide test is described which permits accurate assessment of shunt function in an out‐patient setting. The results of 146 such tests in 96 patients are summarised. Three groups of patients were defined: in group A were those asymptomatic for raised intracranial pressure and with functioning shunts; in group B were those asymptomatic but with non‐functioning shunts; and in group C were those symptomatic and with non‐functioning shunts. The authors discuss the advantages of this method of testing, and the interesting finding that 21 of the 96 patients were no longer shunt‐dependent.