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External auditory canal pH in chronic otitis externa.

P Martinez Devesa1, C M Willis, J W R Capper

  • 1ENT Department, Wycombe Hospital, Queen Alexandra Road, High Wycombe, Buckinghamshire, HP11 2TT, UK. pablo@2oto.fsnet.co.uk

Clinical Otolaryngology and Allied Sciences
|July 23, 2003
PubMed
Summary

Alkaline ear canal pH is a significant risk factor for developing chronic otitis externa. This study found higher ear canal pH in chronic otitis externa patients, especially younger individuals with more severe conditions.

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Area of Science:

  • Otolaryngology
  • Dermatology
  • Microbiology

Background:

  • Otitis externa can become chronic, with altered external auditory canal skin pH suggested as a contributing factor.
  • Previous studies noted pH changes in acute otitis externa, but their role in chronicity requires further investigation.

Purpose of the Study:

  • To compare the external auditory canal pH in individuals with chronic otitis externa versus a control group.
  • To investigate the correlation between external auditory canal pH and the severity of chronic otitis externa.
  • To explore the relationship between age, external auditory canal pH, and chronic otitis externa severity.

Main Methods:

  • Prospective control study comparing age/sex-matched chronic otitis externa patients (without current exacerbation) and healthy controls.

Related Experiment Videos

  • Measurement of external auditory canal skin pH and body skin pH.
  • Assessment of chronic otitis externa severity using a multiparameter scoring system.

    • Main Results:

    • Significantly higher external auditory canal pH was observed in the chronic otitis externa group compared to controls (P < 0.004).
    • No difference in body skin pH was found between groups.
    • A positive correlation existed between higher external auditory canal pH and increased chronic otitis externa severity (r = 0.562; P < 0.02).
    • Younger patients exhibited more severe chronic otitis externa (r = -0.813; P < 0.001) and higher ear canal pH (r = -0.550; P < 0.02).

    Conclusions:

    • Alkaline ear canal skin pH is identified as a local risk factor for the progression to chronic otitis externa.
    • The severity of chronic otitis externa is linked to higher ear canal pH.
    • Younger individuals with chronic otitis externa present with greater severity and higher ear canal pH.