Neuropsychological deficits in a case of H2S anoxic encephalopathy.

A comprehensive examination of the neuropsychological status of a young male patient of anoxic encephalopathy due to acute hydrogen sulfide intoxication was made. Agraphia, acalculia, deficits of associative verbal fluency and design fluency, and general intellectual deterioration were noted. Qualitative analysis of number operation revealed a specific impairment in the performance of division. Further analysis of graphic output showed a phonological substitution feature. The disorder of written language in the absence of disorders of language and communication in other modalities and praxis can be considered pure agraphia. The possible neural substrate for pure agraphia and partial acalculia was also discussed.