High-frequency electrostimulation hearing after mastoidectomy

Mark Hegewald, Robin Heitman, Michael L. Wiederhold, J. C. Cooper, George A. Gates

Research output: Contribution to journalArticlepeer-review

23 Scopus citations


This study was undertaken to measure the degree of high-frequency sensorineural hearing loss following mastoid surgery. Twenty-five patients undergoing mastoidectomy procedures were tested preoperatively, less than 2 days postoperatively, and at 30 days postoperatively using the Tonndorf Audimax 500 high-frequency audiometer. Electrostimulation thresholds in 1-kHz intervals, from 1 to 20 kHz, were measured, and the highest detectable frequency was determined to within 0.1 kHz. Surgical drilling time was recorded. Average drilling time was 51 minutes. A significant temporary threshold shift was observed, measurable at multiple frequencies, less than 48 hours after mastoidectomy. There was no clinically significant change in electrostimulation thresholds (measured in 1-kHz increments, from 1 to 16 kHz) preoperatively to 30 days postoperatively. A statistically significant average loss of 0.89 kHz in the highest frequency producing a measurable response was noted (p < 0.05). Determinations of the highest measurable frequency may be the most sensitive measure of surgically-induced, high-frequency sensorineural hearing changes.

Original languageEnglish (US)
Pages (from-to)49-56
Number of pages8
JournalOtolaryngology–Head and Neck Surgery
Issue number1
StatePublished - Jan 1989

ASJC Scopus subject areas

  • Surgery
  • Otorhinolaryngology


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