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Relation between nasal and middle ear allergy. Experimental study.

T Yamashita, N Okazaki, T Kumazawa

    The Annals of Otology, Rhinology & Laryngology. Supplement
    |May 1, 1980
    PubMed
    Summary
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    Nasal allergy does not directly impact the middle ear or eustachian tube. Studies show allergic changes in the eustachian tube only occur when allergens directly enter the ear, not through nasal passages.

    Area of Science:

    • Otolaryngology
    • Allergy Immunology
    • Pathology

    Background:

    • Otitis media with effusion (OME) is a common condition, and its relationship with nasal allergies is often debated.
    • Understanding the direct pathological mechanisms linking nasal and middle ear conditions is crucial for effective treatment.

    Purpose of the Study:

    • To investigate the histological relationship between nasal allergy and otitis media with effusion.
    • To examine allergic-induced histological changes within the eustachian tube in an animal model.

    Main Methods:

    • Sensitized guinea pigs were used to model allergic responses.
    • Antigen was administered directly into the tympanic cavity in one group.
    • Antigen was administered intranasally in a separate group to assess differing routes of exposure.

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    Main Results:

    • Direct introduction of antigen into the tympanic cavity resulted in clear histological signs of allergic changes in the eustachian tube and middle ear.
    • Intranasal antigen administration led to significant allergic changes in the nasal passages and pharynx.
    • No allergic changes were observed in the eustachian tube or tympanic cavity following intranasal antigen administration.

    Conclusions:

    • Allergic rhinitis (nasal allergy) appears to have minimal direct pathological connection to middle ear conditions like otitis media with effusion.
    • The eustachian tube's allergic response is localized and dependent on direct allergen exposure to the middle ear space.