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Is it possible to predict diffuse obliterative otosclerosis preoperatively by audiologic examination
Aydan Genç1, Levent Sennaroğlu
1Department of Ear Nose Throat and Head and Neck Surgery, Section of Audiology, Hacettepe University, Faculty of Medicine, Ankara, Turkey. lsennar@tr.net
International Journal of Audiology
|May 10, 2007
Summary
A large air-bone gap in conductive hearing loss may indicate diffuse obliterative otosclerosis, suggesting a more complex surgery and potentially poorer hearing outcomes. This finding aids surgeons in patient counseling and surgical planning.
Area of Science:
- Otolaryngology
- Audiology
- Surgical Pathology
Background:
- Otosclerosis is a bone disease affecting the stapes, leading to conductive hearing loss.
- Diffuse obliterative otosclerosis presents more extensive footplate pathology than annular otosclerosis, requiring greater surgical skill and often yielding worse hearing results.
- Preoperative audiological assessment is crucial for differentiating otosclerosis subtypes and predicting surgical outcomes.
Purpose of the Study:
- To compare the preoperative audiological features of patients with annular versus diffuse obliterative otosclerosis.
- To identify audiological indicators that may predict the extent of otosclerosis pathology and surgical difficulty.
Main Methods:
- Retrospective study of 60 patients with conductive hearing loss who underwent stapedectomy.
- Patients were divided into two groups: 30 with annular otosclerosis and 30 with diffuse obliterative otosclerosis.
- Preoperative air- and bone-conduction thresholds were analyzed across various frequencies (125-6000 Hz).
Main Results:
- The diffuse obliterative otosclerosis group exhibited a significantly larger average air-bone gap (37.5 dB) compared to the annular group (23.8 dB).
- Audiogram patterns differed: annular otosclerosis showed a consistent air-bone gap across frequencies, while diffuse otosclerosis had a larger gap at low frequencies, decreasing at high frequencies.
- No significant differences were observed in bone-conduction thresholds or Carhart notch between the two groups.
Conclusions:
- A large air-bone gap in conductive hearing loss can be a predictive sign of diffuse obliterative otosclerosis.
- Identifying diffuse obliterative otosclerosis preoperatively can alert surgeons to potential surgical challenges and less favorable hearing outcomes.
- Informing patients about the possibility of diffuse otosclerosis when a large air-bone gap is present is recommended for managing expectations.
