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Synthetic pyrethroid insecticides: a dermatological evaluation.

S A Flannigan, S B Tucker, M M Key

    British Journal of Industrial Medicine
    |June 1, 1985
    PubMed
    Summary
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    Synthetic pyrethroids like fenvalerate and permethrin cause distinct skin sensations due to their chemical structure. Vitamin E acetate effectively treats these pyrethroid-induced paresthesias, offering a high therapeutic index.

    Area of Science:

    • Toxicology
    • Neuroscience
    • Organic Chemistry

    Background:

    • Synthetic pyrethroids are widely used insecticides.
    • Their biological activity is linked to molecular structure.
    • Cutaneous sensations are a known side effect of some pyrethroids.

    Purpose of the Study:

    • To investigate differences in cutaneous sensations induced by alpha-cyano (fenvalerate) and non-cyano (permethrin) synthetic pyrethroids.
    • To establish a correlation between pyrethroid concentration and the degree of induced dysesthesia.
    • To evaluate the efficacy of dl-alpha tocopherol acetate (vitamin E acetate) in treating pyrethroid-induced paresthesia.

    Main Methods:

    • Human participants were exposed topically to fenvalerate and permethrin.
    • Participants reported and quantified their cutaneous sensations.

    Related Experiment Videos

  • Linear regression analysis was used to correlate concentration with sensation intensity.
  • The therapeutic effect of vitamin E acetate was assessed.

    • Main Results:

    • Fenvalerate and permethrin induced different cutaneous sensations, with alpha-cyano pyrethroids causing more intense sensations.
    • A strong positive correlation was found between insecticidal potency and induced cutaneous sensation.
    • A linear relationship was observed between the concentration of both pyrethroids and the degree of induced dysesthesia.
    • Topical vitamin E acetate demonstrated a high efficacy (nearly 100% therapeutic index) in inhibiting pyrethroid-induced paresthesia.

    Conclusions:

    • The presence of a cyano group in synthetic pyrethroids significantly influences the type and intensity of cutaneous sensations.
    • Cutaneous sensation intensity is directly related to pyrethroid concentration and insecticidal potency.
    • Vitamin E acetate is a highly effective treatment for managing sensory disturbances caused by synthetic pyrethroid exposure.