Does stapedotomy improve high frequency conductive hearing?

Area of Science:

• Otolaryngology
• Audiology
• Surgical Innovation

Background:

• Stapedotomy is a common surgical procedure to correct conductive hearing loss.
• While effective for low frequencies, high-frequency hearing outcomes post-stapedotomy are less predictable.
• High-frequency air-bone gap changes after stapedotomy require further investigation.

Purpose of the Study:

• To evaluate changes in high-frequency (HF) air-bone gap (ABG) after stapedotomy.
• To measure changes in HF air conduction (AC) thresholds as a function of frequency.
• To compare low-frequency (LF) and HF ABG closure post-stapedotomy.

Main Methods:

• Retrospective review of 46 patients undergoing primary stapedotomy with incus wire piston prosthesis.
• Analysis of pre- and postoperative audiograms.
• Calculation of LF ABG (250, 500, 1000 Hz) and HF ABG (4 kHz).

Main Results:

• Significant reduction in both LF ABG (36.9 to 9.35 dB) and HF ABG (31.1 to 14.5 dB) was observed (P < .001).
• LF ABG closure was over 1.5 times greater than HF ABG closure (P < .001).
• Air conduction gain decreased with increasing frequency (P < .001).

Conclusions:

• Stapedotomy yields greater hearing improvement at low frequencies compared to high frequencies.
• Postoperative air-bone gaps persist at 4 kHz.
• Further research into the biomechanics and histopathology of high-frequency deficits is needed to enhance stapedotomy outcomes.