A simple, safe radionuclide technique for evaluating the functional status of a cerebrospinal fluid shunt has been used in the clinical management of hydrocephalus in 306 patients over a seven-year period. Results of 526 studies showed greater than 99% sensitivity and accuracy in diagnosing distal shunt obstruction and 96% correct correlation with clinical outcome overall. Intrareservoir pressure measurements are especially valuable to diagnose proximal catheter shunt malfunction and to assess shunt dependency.
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Hayden et al. (1980) studied this question.