Objective Measures by VSB-Patients-The Chirp-Stimuli. First results

 

Objective To date, objective measurement procedures are not routinely performed on VSB-treated patients. The aim of our study is to measure ABR potentials intra- and postoperatively.

Methods Six patients with severe mixed hearing loss and a mean sensorineural hearing loss component between 40 and 70 dB were examined intraoperatively and postoperatively.

Preoperatively, bone conduction was measured in each patient. The patients received a VSB with the Floating Mass Transducer (FMT) with different coupling.

Bone conduction was measured preoperatively in each patient and then stored on the AP404 processor. Intraoperatively, the transmission of the stimuli of the BERA system (Pilot Blankenfelde Medizinisch Elektronische Geräte GmbH) took place. The hose was directly connected to the processor. In addition to the study, a vibrogram was measured with SAMBA Hi postoperatively and the thresholds were transferred to the AP404 processor. The coupling of the AP404 was integrated postoperatively analogously intraoperatively. Results: We measured patient-response at 500 Hz, 1000 Hz, 2000 Hz and 4000 Hz. We have found that the responses at 1000 and 2000 Hz are clearly documented when the intensity of the stimuli is 30 dB, 40 dB and 50 dB. At other frequencies or intensities gave a saturation. Discussion: A chirp stimulus compensates dispersion by aligning the arrival time of each experiment by aligning the arrival time of each frequency component in the stimulus with its location of maximum excitement along the basilar membrane. The intraoperative measurement offers the possibility of the intraoperative coupling test as well as the postoperative threshold determination for adaptation and clinical follow-up.

Poster-PDF A-1054.pdf

Publication History

Article published online:
10 June 2020

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