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Κυριακή 13 Ιανουαρίου 2019

The combination of lanolin alcohol and Amerchol L101 is effective in patch testing for diagnosing lanolin contact allergy

Diagnosing lanolin contact allergy with lanolin alcohol and Amerchol L101
Jannet Knijp  Derk P. Bruynzeel  Thomas Rustemeyer
First published: 09 January 2019 https://doi.org/10.1111/cod.13210
This article has been accepted for publication and undergone full peer review but has not been through the copyediting, typesetting, pagination and proofreading process, which may lead to differences between this version and the Version of Record. Please cite this article as doi: 10.1111/cod.13210.
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Summary
Background
The prevalence of lanolin contact allergy in dermatitis patients varies from 1.2% to 6.9%. Different lanolin derivatives are used in patch testing.

Objectives
To determine which combination of lanolin derivatives is most effective in patch testing for diagnosing lanolin contact allergy.

Methods
A retrospective analysis of patients patch tested between 2016 and 2017 was performed. Patients were eligible if tested with lanolin alcohol 30% pet., Amerchol L101 50% pet. and a supplementary series containing other lanolin derivatives. Lanolin alcohol and Amerchol L101 were tested in duplicate.

Results
Out of 594 patients, 28.6% (95% confidence interval [CI]: 25.1%‐32.3%) had a positive patch test reaction to at least one lanolin derivative. Reactions were common to lanolin alcohol (14.7%, 95% CI: 11.3%‐18.2%) and Amerchol L101 (15.0%, 95% CI: 11.5%‐18.5%) in the routinely tested series. Reactions to other test preparations were significantly less frequent (P < 0.05). The addition of Amerchol L101 to lanolin alcohol significantly increased the number of positive cases (odds ratio 1.79, P < 0.001).

Conclusions
The combination of lanolin alcohol and Amerchol L101 is effective in patch testing for diagnosing lanolin contact allergy. Routinely testing with other lanolin derivatives may not be worthwhile as it detects only few additional patients.
https://onlinelibrary.wiley.com/doi/10.1111/cod.13210

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