Double-blind placebo-controlled provocation study in patients with subjective Multiple Chemical Sensitivity (MCS) and matched control subjects.
BACKGROUND
Multiple Chemical Sensitivity (MCS) is an acquired disorder with recurrent symptoms referable to multiple organ systems. No widely accepted test of physiologic function correlates with symptoms and it has not been recognized as a distinct entity by the scientific community. Few double-blind placebo-controlled studies have been done. The objectives of this study were to test two hypotheses: that patients with MCS can distinguish reliably between solvents and placebo, and that there are significant differences in objective biological and neuropsychological parameters between solvent and placebo exposures.


METHODS
Twenty patients with MCS and 17 controls underwent six exposure sessions (solvent mixture and clean air in random order, double-blind) in a challenge chamber. Positive reactions were defined as subjective perception of being exposed to solvents, blood pressure or heart rate change of > or = 10%, rash or clinical signs of hypoxia, or symptom severity rise after exposure.


RESULTS
No differences between the groups with regard to sensitivity, specificity, and accuracy were found. Cognitive performance was not influenced by solvent exposure, and did not differ between the groups. There was no difference between the groups in serum cortisol levels measured before and after exposures.


CONCLUSIONS
The hypotheses were not confirmed.
Department of Toxicology, Technical University of Munich, Klinikum rechts der Isar, Muenchen, Germany. s.bornschein@lrz.tum.de
Susanne
S
Bornschein
Constanze
C
Hausteiner
Horst
H
Römmelt
Dennis
D
Nowak
Hans
H
Förstl
Thomas
T
Zilker
D000328:Adult; D001794:Blood Pressure / Q000187:drug effects; D003071:Cognition / Q000187:drug effects; D018592:Cross-Over Studies; D004311:Double-Blind Method; D005260:Female; D006339:Heart Rate / Q000187:drug effects; D006801:Humans; D006854:Hydrocortisone / Q000097:blood; D000860:Hypoxia / Q000209:etiology; D008297:Male; D008875:Middle Aged; D018777:Multiple Chemical Sensitivity / Q000209:etiology* / Q000523:psychology; D009483:Neuropsychological Tests; D010465:Perception; D015990:Placebo Effect; D012720:Severity of Illness Index; D012997:Solvents / Q000009:adverse effects*
D012997:Solvents; D006854:Hydrocortisone