Effects of middle ear surgery on extended high frequency hearing. (2020)
Type of ContentElectronic Thesis or Dissertation
Thesis DisciplineSpeech and Language Sciences
Degree NameMaster of Audiology
PublisherUniversity of Canterbury
AuthorsTimajo, Davidshow all
It is well documented that middle ear surgery leads to a deterioration in hearing acuity in the extended high frequency range (EHF). However, it is yet to be determined whether this deterioration is due to a disruption in sound transmission through the middle ear system or damage to the inner ear. Gaining this information remains a challenge due to limitations in the output of EHF stimuli. The current study aimed to build on two small pilot studies which used a system capable of measuring air conduction (AC) and bone conduction (BC) EHF pure tone thresholds with some degree of masking. Using a modified TEAC HP-F100 BC transducer and a custom laptop audiometer, AC and BC thresholds across the entire audiometric frequency range were monitored up to 1 month (N =20) and 3 months (N =11) post middle ear surgery. Results from this study demonstrate post-operative deterioration in AC thresholds immediately post-op followed by some recovery. Despite encountering constraints in EHF masking output, we report clear evidence of a deterioration in in EHF BC thresholds that persists up to 3 months post-op mainly at 9 to 11.2 kHz. The current study builds a foundation for future studies to examine post-operative outcomes in the range of hearing.