Twelve hospitalized adult patients received 300 mg of oral caffeine 1 h before a diagnostic lumbar puncture. Caffeine concentrations were determined simultaneously in saliva, plasma, and cerebrospinal fluid (CSF). Mean caffeine concentrations in plasma, saliva, and CSF were 5.9 +/- 2.1, 4.4 +/- 1.5, and 2.9 +/- 1.1 micrograms/ml, respectively, with… (More)
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