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Related Experiment Videos

Allergic contact sensitivity in elderly patients.

Stefano Piaserico1, Francesca Larese, Giovanni Piero Recchia

  • 1Institute of Dermatology, University of Padova, Padova, Italy.

Aging Clinical and Experimental Research
|October 7, 2004
PubMed
Summary

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Elderly individuals show fewer positive patch tests for allergic contact dermatitis overall, but higher sensitization to certain topical treatment allergens. Their allergic response may be delayed, requiring extended patch test readings.

Area of Science:

  • Dermatology
  • Allergology
  • Gerontology

Background:

  • Aging influences contact sensitization rates and types.
  • Limited research exists on patch test reactivity in large elderly populations.

Purpose of the Study:

  • To evaluate patch test reactivity in elderly subjects (>65 years).
  • To compare allergic contact dermatitis response patterns between elderly and younger adults.

Main Methods:

  • Patch testing was performed on 1444 elderly subjects and a control group of younger adults (20-40 years).
  • Response patterns and sensitization rates to various allergens were analyzed.

Main Results:

  • Elderly patients had a significantly lower overall positive patch test prevalence (40.7% vs 47.8%).

Related Experiment Videos

  • Increased sensitization rates were observed in elderly patients for specific allergens like primin, neomycin, and lanolin alcohols.
  • Positive reactions were less intense in the elderly, with a higher proportion of weak reactions.
  • Delayed reaction patterns, with increased intensity at 72 hours versus 48 hours, were more frequent in elderly patients.

    • Conclusions:

    • Overall patch test reactivity declines with age, but sensitization to certain topical treatment allergens increases.
    • Allergic responses in the elderly may be delayed, necessitating extended patch test reading times (e.g., 7 days).
    • Weak patch test reactions in elderly patients should be carefully interpreted as potentially valid positive results.