title: Electrical impedance model for evaluation of skin irritation in rabbits and humans.
abstract: OBJECTIVE
  The electrical impedance method has been used as a quantitative technique for evaluating changes in the skin during irritation within the invisible range. The purpose of this study was to apply an electrical model of skin to the interpretation of impedance data after the application of an irritant (SLS) in the skin of humans and rabbits.
  
  
  METHODS
  Investigations were performed on 12 humans and 15 albino rabbits. Responses were evaluated by measuring electrical impedance before irritant exposure and 24 h after its removal and also by visual inspection. Using the raw impedance parameter, a novel index was developed and its value was correlated with visual scoring.
  
  
  RESULTS
  The derived impedance index showed a significant correlation with visual scores and its value decreased (P<0.05) after irritant removal even without macroscopic signs of irritation.
  
  
  CONCLUSIONS
  The proposed electrical model of skin seems to be suitable for the detection and interpretation of changes in the impedance characteristics of skin induced by SLS in rabbits and humans.
authors.affiliation: Program of Biomedical Engineering - COPPE, Federal University of Rio de Janeiro, Rio de Janeiro - RJ, Brazil.
authors.forename: D M
authors.initials: DM
authors.lastname: Ferreira
authors.forename: C S
authors.initials: CS
authors.lastname: Silva
authors.forename: M N
authors.initials: MN
authors.lastname: Souza
mesh_terms: D000293:Adolescent; D000328:Adult; D000818:Animals; D003877:Dermatitis, Contact / Q000175:diagnosis*; D017097:Electric Impedance; D004582:Electronics, Medical; D005260:Female; D006795:Household Products; D006801:Humans; D007509:Irritants; D008297:Male; D008954:Models, Biological; D011817:Rabbits; D012720:Severity of Illness Index; D023422:Skin Irritancy Tests / Q000295:instrumentation*; D012967:Sodium Dodecyl Sulfate
chemical_list: D007509:Irritants; D012967:Sodium Dodecyl Sulfate