Do high-frequency air-bone gaps persist after ossiculoplasty?

Laryngoscope Investigative Otolaryngology

article

Marc D. Polanik¹  Danielle R. Trakimas⁴  Melissa Castillo-Bustamante¹  Jeffrey T. Cheng¹  Elliott D. Kozin¹  Aaron K. Remenschneider¹ 

[1] Eaton-Peabody Laboratories;Department of Otolaryngology, UMass Memorial Medical Center;University of Massachusetts Medical School;Department of Otolaryngology-Head & Neck Surgery, Johns Hopkins School of Medicine;Department of Otolaryngology-Head & Neck Surgery, Harvard Medical School

关键词: conductive hearing loss;    hearing loss;    high-frequency hearing loss;    middle ear reconstruction;    ossiculoplasty;   

DOI  :  10.1002/lio2.418

学科分类：环境科学（综合）

来源: Wiley

【 摘 要 】

Objectives: Conventional reporting of postoperative hearing outcomes utilizes a pure-tone averaged air-bone gap (ABG) that is biased toward low frequencies. Consequently, a high-frequency ABG after otologic surgery may go unnoticed. In this study, we evaluate changes in low- and high-frequency ABG following ossiculoplasty. Study design: Retrospective review. Subjects and setting: Consecutive series of patients who underwent ossiculoplasty at a single tertiary care center. Patients with pre- and postoperative audiograms were included. Methods: Low-frequency ABG was calculated as the mean ABG at 250, 500, and 1000 Hz. High-frequency ABG was calculated at 4 kHz. Pre- and postoperative ABGs were compared. Results: Thirty-seven consecutive patients were included. Mean age at surgery was 38 years (range, 7-77 years). Reconstruction materials included: cartilage (N = 4), hydroxyapatite cement (N = 5), and partial or total ossicular replacement prostheses (N = 20 and N = 8, respectively). Postoperatively, the mean low-frequency ABG improved by 11.9 ± 15.1 dB (P < .0001) and the mean high-frequency ABG improved by 5.9 ± 16.0 dB (P = .030). Low-frequency ABG closure was significantly larger than high-frequency ABG closure (P = .007). Mean postoperative persistent high-frequency ABG was 22.0 ± 13.8 dB. Conclusion: In this series, ossiculoplasty improved ABG across all frequencies, but greater improvements were observed at low frequencies when compared to high frequency. Current reporting standards may not identify persistent high-frequency ABG. Additional study of the mechanisms of high-frequency sound conduction in reconstructed middle ears is needed to improve high-frequency hearing outcomes in ossiculoplasty.

【 授权许可】

CC BY|CC BY-NC-ND