Document Detail

Abnormal electrochemical skin conductance in cystic fibrosis.
MedLine Citation:
PMID:  20920895     Owner:  NLM     Status:  In-Data-Review    
BACKGROUND: Electrochemical skin conductance measurement is an active electrophysiologic method in which incremental low direct voltage is applied on the skin. It generates a current due to reverse iontophoresis which previous studies suggested to be mostly related to chloride anion movements. As sweat chloride movements upon electric stimulation were likely to be impaired in cystic fibrosis (CF) patients, we designed a proof-of-concept study to measure electrochemical skin conductance in CF patients and control subjects and to test the ability of this method to discriminate CF from controls.
METHODS: Electrochemical skin conductance was measured in 41 adult patients with classical CF and 20 healthy control subjects. Patients placed their hands and feet on nickel electrodes and an incremental low direct voltage was applied on the anode during 2min. The resulting voltage on the cathode and the current generated between anode and cathode were measured and from them, two electrochemical skin conductance variables were calculated: ESC, obtained when a low voltage of 1.6V was applied, and dESC which took into account electrochemical skin conductances obtained when low and high voltages were applied.
RESULTS: ESC measurements on hands and feet were significantly different in CF patients (on feet: 75±10μSi), as compared with control subjects (62±13μSi, p<0.0001); dESC was also significantly different and more discriminative in CF patients (on feet: 34±24μSi), as compared with control subjects (93±24μSi, p<0.0001). dESC measurement provided a diagnostic specificity of 1 and a sensitivity of 0.93.
CONCLUSIONS: These results show that electrochemical skin conductance which is easily and rapidly measured is abnormal in CF patients. Trial registry name in the European Clinical Trials Database (eudraCT): "EZSCAN MUCO1: Mesure de la conductance cutanée par chronoampérométrie", N°EUDRACT: 2007-A00221-52.
Dominique Hubert; Philippe Brunswick; Jean-Henri Calvet; Daniel Dusser; Isabelle Fajac
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of cystic fibrosis : official journal of the European Cystic Fibrosis Society     Volume:  10     ISSN:  1873-5010     ISO Abbreviation:  J. Cyst. Fibros.     Publication Date:  2011 Jan 
Date Detail:
Created Date:  2011-01-18     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101128966     Medline TA:  J Cyst Fibros     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  15-20     Citation Subset:  IM    
Copyright Information:
Copyright © 2010 European Cystic Fibrosis Society. Published by Elsevier B.V. All rights reserved.
Service de Pneumologie, AP-HP, Hôpital Cochin, Paris, France.
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