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Related Experiment Videos

Patch tests with potassium dichromate removed after 24 and 48 hours.

E Rudzki, Z Zakrzewski, G Prokopczyk

    Contact Dermatitis
    |December 1, 1976
    PubMed
    Summary

    Potassium dichromate release from patches was rapid, with over 90% released within 24 hours. Most patients positive for potassium dichromate remained positive after early patch removal, indicating reliable patch test results.

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    Area of Science:

    • Dermatology
    • Toxicology
    • Materials Science

    Background:

    • Potassium dichromate is a common contact allergen.
    • Patch testing is crucial for diagnosing allergic contact dermatitis.
    • Understanding in vitro release kinetics is vital for optimizing diagnostic accuracy.

    Purpose of the Study:

    • To determine the in vitro release rate of potassium dichromate from patch tests.
    • To assess the impact of early patch removal on diagnostic outcomes.
    • To evaluate the reliability of patch tests with varying potassium dichromate concentrations.

    Main Methods:

    • In vitro release assay of four potassium dichromate concentrations (0.01% to 0.5%).
    • Analysis of K2Cr2O7 release over 24 and 48 hours.

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  • Clinical patch testing on 30 patients positive for 0.05% potassium dichromate, with early (24h) and routine removal.

    • Main Results:

    • Over 90% of potassium dichromate was released within 24 hours in vitro.
    • 29 out of 30 patients (96.7%) remained positive to 0.05% potassium dichromate after 24-hour patch removal.
    • Early patch removal showed consistent results, even with lower concentrations.

    Conclusions:

    • Potassium dichromate exhibits rapid in vitro release kinetics.
    • Patch tests for potassium dichromate allergy are reliable even with early removal.
    • The findings support the efficacy of standard patch testing protocols for diagnosing potassium dichromate sensitivity.