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The Effect of Mandibulectomy and Mandibulotomy on Cochlear Function.

Sercan Gode1, Isa Kaya, Goksel Turhal

  • 1Otolaryngology Department, Ege University Faculty of Medicine, Izmir, Turkey.

The Journal of Craniofacial Surgery
|December 23, 2016
PubMed
Summary

Mandibulectomy and mandibulotomy surgeries negatively impact cochlear function, as evidenced by diminished distortion product otoacoustic emissions (DPOAEs) near the osteotomy site shortly after the procedure.

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Area of Science:

  • Otolaryngology
  • Audiology
  • Neurosurgery

Background:

  • Mandibulectomy and mandibulotomy utilize oscillating saws, generating acoustic energy.
  • This energy can transfer to the cochlea via the temporomandibular joint and air conduction.
  • The potential ototoxic effects of these surgical procedures on hearing require investigation.

Purpose of the Study:

  • To evaluate the impact of mandibulectomy and mandibulotomy on cochlear function.
  • To assess changes in auditory function following osteotomy procedures.
  • To determine if surgical side correlates with cochlear function changes.

Main Methods:

  • Prospective study involving 15 patients undergoing mandibulectomy or mandibulotomy.
  • Preoperative and postoperative pure-tone audiometry and distortion product otoacoustic emission (DPOAE) measurements were collected.
  • Statistical analysis focused on signal-to-noise ratio (SNR) differences and correlations.

Main Results:

  • A statistically significant decrease in DPOAE signal-to-noise ratio (SNR) was observed at 4 kHz in the operated ear (P < 0.05).
  • DPOAEs were diminished on the osteotomy side one day postoperatively.
  • A significant correlation was found between SNR measurements and the side of the osteotomy (P < 0.05).

Conclusions:

  • Mandibulectomy and mandibulotomy procedures have a demonstrable negative effect on cochlear function in the early postoperative period.
  • Distortion product otoacoustic emissions indicate temporary cochlear damage.
  • Further research with longer follow-up is needed to understand the long-term prognosis of cochlear function after these surgeries.