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Direct-Drive-Audiometry and Direct-Drive-ABR – new subjective and objective audiologic measurements for Vibroplasty-patients
Introduction Preoperative Direct-Drive-Simulation (DDS) simulates the sound of “Vibroplasty-Hearing” to vibroplasty-candidates. The direct-drive-pure-tone-audiometry (DD-PTA), direct-drive-speech-audiometry (DD-SA) and direct-drive-ABR (DD-ABR) as further developments of the DDS are new audiometric tools. This study shows the first results of vibroplasty-candidates and attempts to proof the reliability of the DDS even in case of mixed and conductive hearing loss.
Material und Methods 15 vibroplasty-candidates performed DDS, DD-PTA, DD-SA and DD-ABR. Candidates suffered from mixed, conductive or sensorineural hearing loss. The Results were compared with the results of standard audiometry. DD-ABR thresholds were related to DD-PTA thresholds. DD-PTA and DD-SA were performed with and without masking in 10 cases.
Results The DD-PTA threshold was close to the air conduction threshold of standard audiometry and congruent to the speech recognition threshold of DD-SA (50 % numbers). DD-ABR threshold lay approximately 10dB higher than DD-PTA threshold. DD-PTA and DD-SA where independent from masking.
Discussion Congruent results in DD-PTA, DD-SA and DD-ABR in patients with different hearing loss show the reliability of the new audiometric tools, which before was only shown in normal hearing listeners. The DD-ABR threshold proofs, that DDS is possible even in case of conductive or mixed hearing loss. To our knowledge, these audiometric measurements are the first masking-independent audiometric tools. Further research will show how far these new measurements have predictive value concerning the hearing results of vibroplasty candidates.
Conflict of interest
Der Erstautor gibt keinen Interessenskonflikt an.
Address for correspondence
13 May 2021 (online)
Georg Thieme Verlag KG
Rüdigerstraße 14, 70469 Stuttgart, Germany