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Functional correlations of tympanic membrane perforation size.

Bob Lerut¹, Alain Pfammatter, Johnny Moons

¹Department of Otorhinolaryngology, Head and Neck Surgery, AZ Sint Jan Brugge-Oostende AV, campus Brugge, Bruges, West-Vlaanderen, Belgium. bob.lerut@azbrugge.be

Otology & Neurotology : Official Publication of the American Otological Society, American Neurotology Society [And] European Academy of Otology and Neurotology

|February 16, 2012

Summary

Conductive hearing loss is linearly related to eardrum perforation size. Umbo involvement worsens hearing, but perforation location does not impact hearing loss, with the least effect at 2 kHz.

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Area of Science:

Otolaryngology
Audiology
Surgical Pathology

Background:

Tympanic membrane perforations are common sequelae of chronic otitis media.
Conductive hearing loss is a frequent complication of eardrum perforations.
Understanding the relationship between perforation characteristics and hearing loss is crucial for surgical planning.

Purpose of the Study:

To investigate the correlation between the size and location of tympanic membrane perforations and the degree of conductive hearing loss.
To identify specific perforation features that significantly impact hearing outcomes.
To establish guidelines for assessing additional middle ear pathology based on air-bone gap patterns.

Main Methods:

Prospective analysis of 220 patients undergoing primary surgery for chronic otitis media with eardrum perforation.
Inclusion of 155 perforations from 151 patients with confirmed diagnosis, normal middle ear status, and intact ossicular chain.
Primary myringoplasty performed on all included patients.

Main Results:

A significant linear relationship was observed between eardrum perforation size and conductive hearing loss.
Involvement of the umbo at the perforation margin resulted in a 5-6 dB worsening of hearing (p < 0.0001).
The resonance frequency of 2 kHz showed the least impact; an 'inverted V-shape' air-bone gap pattern was consistent above and below this frequency.

Conclusions:

Standardized documentation of perforation size is recommended for preoperative assessment.
The size of the eardrum perforation directly correlates with conductive hearing loss.
Umbo involvement negatively impacts hearing, while perforation position is not a significant factor. An 'inverted V-shape' air-bone gap pattern aids in identifying additional pathologies.