Miller Fisher test
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The Miller Fisher Test (also known as the lumbar tap test) is used to decide whether shunting of cerebrospinal fluid (CSF) would be helpful in a patient with normal pressure hydrocephalus (NPH). The test involves removing 50 mL of CSF, after which cognitive function is clinically reassessed.
Clinical improvement showed a high predictive value for subsequent success with shunting. A "negative" test has a very low predictive accuracy, as many patients may improve after a shunt in spite of lack of improvement after CSF removal.
This is a process that was described by neurologist, Charles Miller Fisher.
This is a nasty process.