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[The pathogenesis of otitis externa].

W Mann, U Goebel, T Sanabria de Isele

    HNO
    |February 1, 1983
    PubMed
    Summary
    This summary is machine-generated.

    Gram-negative bacteria, particularly Pseudomonas aeruginosa, are key in otitis externa, especially recurrent cases and swimmer's ear. Exoenzyme activity, not disease severity, influences chronicity, decreasing with successful treatment.

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    Laryngo- rhino- otologie·2015

    Area of Science:

    • Microbiology
    • Otolaryngology
    • Infectious Diseases

    Background:

    • Otitis externa involves a shift from Gram-positive to Gram-negative microbial flora in the auditory canal.
    • Pseudomonas aeruginosa is frequently implicated in recurrent otitis externa and swimmer's ear.

    Purpose of the Study:

    • To investigate the microbial flora in otitis externa, focusing on Pseudomonas species.
    • To assess the role of Pseudomonas exoenzyme activity in disease chronicity and therapeutic outcomes.

    Main Methods:

    • Bacterial isolation and serotyping of Pseudomonas species from patients with otitis externa.
    • Analysis of protease and lipase activity in Pseudomonas isolates.
    • Correlation of microbial findings and enzyme activity with disease severity and chronicity.

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    Main Results:

    • Gram-negative flora, including Pseudomonas aeruginosa and occasionally Pseudomonas maltophilia, were identified in otitis externa.
    • No direct correlation was found between Pseudomonas protease/lipase activity and disease severity.
    • Exoenzyme activity appeared to influence the chronicity of otitis externa, with activity declining post-therapy.

    Conclusions:

    • Pseudomonas species are significant pathogens in otitis externa.
    • Exoenzyme activity is a potential factor in the chronicity of otitis externa.
    • Successful treatment of otitis externa correlates with reduced Pseudomonas exoenzyme activity.