Bromisoval has been used as a hypnotic for the past several decades, and its abuse was known to cause various neurological as well as psychiatric symptoms. Three patients showed a variety of symptoms which could not be explained neuroanatomically: nystagmus, gait disturbance and hyperreflexia of the limbs in all the cases, dysarthria, double vision, hypotonia, ataxic gait and disturbance of consciousness occasionally and auditory agnosia in one case. For the purpose of determining the diagnosis, an energy dispersive X-ray microanalysis (EDX) was used to detect bromine. Five microliters of specimens were placed on the carbon-coated mesh, and using a TN-2000 analyzer, characteristic X-ray peaks of bromine were detected in the serum, urine and cerebrospinal fluid. The sensitivity to detect bromine in the serum was 30 micrograms/ml.
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