Peroperative temporary threshold shift in ear surgery. An electrocochleographic study.
TTS resulting from drilling in the temporal bone was detected by means of pre- and post-exposure ECoG recordings taken during ear surgery for chronic otitis media. The TTS obtained varied between 5 and 40 dB at 4 and 8 kHz. The correlation between duration of noise exposure and magnitude of TTS was statistically significant. The results indicate that drill-induced noise in ear surgery may result in postoperative high-tone sensorineural hearing loss, and support the view that manipulation of the ossicular chain during ear surgery causes mainly a threshold shift at the lower frequencies.
D000161:Acoustic Stimulation; D001309:Auditory Threshold; D001844:Bone Conduction; D003051:Cochlea / Q000502:physiology*; D003638:Deafness / Q000209:etiology; D004423:Ear / Q000601:surgery*; D004566:Electrodes; D005500:Follow-Up Studies; D006801:Humans; D009622:Noise / Q000009:adverse effects; D010033:Otitis Media / Q000601:surgery; D011183:Postoperative Complications; D013997:Time Factors