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Related Experiment Videos

Polymorphous light eruption: action spectrum and photoprotection.

B Ortel, A Tanew, K Wolff

    Journal of the American Academy of Dermatology
    |May 1, 1986
    PubMed
    Summary
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    Photochemotherapy (psoralens with ultraviolet A [PUVA]) effectively prevents polymorphous light eruption, a common sun allergy. Most patients benefit from PUVA treatment, regardless of their specific light sensitivity spectrum.

    Area of Science:

    • Dermatology
    • Photobiology

    Background:

    • Polymorphous light eruption (PMLE) is a prevalent seasonal photodermatosis.
    • Diagnosis in remission relies on phototesting to reproduce lesions.
    • Photochemotherapy (PUVA) is an established preventive treatment for PMLE.

    Purpose of the Study:

    • To evaluate the efficacy of PUVA as a preventive treatment for PMLE.
    • To determine the action spectrum of PMLE in a patient cohort.
    • To assess patient outcomes following PUVA pretreatment.

    Main Methods:

    • 167 patients with PMLE history or active disease were enrolled.
    • Phototesting was performed on 142 patients to identify lesion triggers.
    • 122 patients received preventive PUVA treatment, with 51 undergoing follow-up.

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    Main Results:

    • 49% of tested patients developed PMLE lesions upon phototesting.
    • The action spectrum was predominantly UVA (56%), followed by UVB (17%) and both (26%).
    • 64% of followed patients reported total protection from PMLE with PUVA, 26% partial, and 10% none.

    Conclusions:

    • PUVA pretreatment offers significant protection against PMLE for the majority of patients.
    • Observed action spectra and phototest positivity rates varied from previous reports, suggesting a need for standardized testing.
    • PUVA is a beneficial treatment for PMLE irrespective of the identified action spectrum.