A Quantitative Approach for the Objective Assessment of Coupling Efficiency for an Active Middle Ear Implant by Recording Auditory Steady-state Responses.
Journal
Otology & neurotology : official publication of the American Otological Society, American Neurotology Society [and] European Academy of Otology and Neurotology
ISSN: 1537-4505
Titre abrégé: Otol Neurotol
Pays: United States
ID NLM: 100961504
Informations de publication
Date de publication:
08 2020
08 2020
Historique:
entrez:
14
7
2020
pubmed:
14
7
2020
medline:
15
4
2021
Statut:
ppublish
Résumé
The coupling efficiency of a semi-implantable active middle ear implant with an electromagnetically driven floating mass transducer coupled to a middle ear ossicle or the round window can only be quantified postoperatively in cooperative patients by measuring behavioral vibroplasty in situ thresholds in comparison with bone conduction thresholds. The objective of the study was to develop a method to objectively determine the vibroplasty in situ thresholds by determining calibration factors from the relation between the objective and behavioral vibroplasty in situ thresholds. Prospective experimental study. Fifteen patients, implanted with an active middle ear implant for at least 6 months. Diagnostic. Vibroplasty in situ thresholds measured objectively by auditory steady state responses (floating mass transducer [FMT]ASSR). Subjective vibroplasty in situ thresholds were measured in this experimental ASSR set-up (FMTsubj.) and behaviorally by pure-tone audiometry (vibrogram). All thresholds were obtained at 500, 1000, 2000, and 4000 Hz. Thresholds could be objectively measured by ASSR in all patients. Differences between the FMTASSR and FMTsubj. were statistically significant but small. A significant correlation was found between the FMTASSR and the vibrogram thresholds at 4000 Hz but not for the other test frequencies. The method is feasible to measure objective vibroplasty in situ thresholds in active middle ear implant users. Since calibration factors could not be determined for all frequencies, the method is only applicable to comparatively determine the coupling efficiency of the floating mass transducer.
Identifiants
pubmed: 32658108
doi: 10.1097/MAO.0000000000002484
pii: 00129492-202008000-00044
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
e906-e911Références
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