title: Effects of hydrogen sulfide on neurobehavioral function.
abstract: BACKGROUND
  Nineteen hydrogen sulfide (H2S)-exposed patients were compared with 202 unexposed subjects. This 1997-to-2001 case-referent series was compared with 16 previous (1991-1996) case-referent patients.
  
  
  METHODS
  New patients were bystanders of H2S exposure and none had been unconscious. In contrast, 13 members of the prior group were exposed at work and 7 had been unconscious. The three groups were compared on the basis of 8 physiologic and 12 psychological measurements. Observed measurements were compared with predicted ones after adjusting for age, sex, educational attainment (years), and other significant factors (observed/predicted x 100).
  
  
  RESULTS
  The new group performed poorly compared with unexposed controls and were similar to the first group on balance, reaction time, color discrimination, visual performance, hearing, Culture Fair, digit symbol, vocabulary, verbal recall, peg placement, trail making A and B, and information.
  
  
  CONCLUSIONS
  H2S impairments associated with H2S were similar in 19 workers (44% had been unconscious) and in 16 bystanders who had not been unconscious.
authors.affiliation: Environmental Sciences Laboratory, Keck School of Medicine, University of Southern California, Los Angeles, CA 90033, USA. kilburn@usc.edu
authors.forename: Kaye H
authors.initials: KH
authors.lastname: Kilburn
mesh_terms: D000328:Adult; D000368:Aged; D000393:Air Pollutants / Q000009:adverse effects*; D000395:Air Pollutants, Occupational / Q000009:adverse effects*; D001927:Brain Diseases / Q000139:chemically induced* / Q000175:diagnosis; D016022:Case-Control Studies; D003118:Color Perception / Q000187:drug effects; D004305:Dose-Response Relationship, Drug; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D006862:Hydrogen Sulfide / Q000009:adverse effects*; D008297:Male; D008875:Middle Aged; D009460:Neurologic Examination / Q000187:drug effects; D009483:Neuropsychological Tests; D009784:Occupational Diseases / Q000139:chemically induced* / Q000175:diagnosis; D004856:Postural Balance / Q000187:drug effects; D011596:Psychomotor Disorders / Q000139:chemically induced* / Q000175:diagnosis; D011930:Reaction Time / Q000187:drug effects; D014474:Unconsciousness / Q000139:chemically induced
chemical_list: D000393:Air Pollutants; D000395:Air Pollutants, Occupational; D006862:Hydrogen Sulfide