Fröhlich, Laura;
Rahne, Torsten;
Plontke, Stefan K.;
Oberhoffner, Tobias;
Dziemba, Oliver;
Gadyuchko, Maria;
Hoth, Sebastian;
Mir-Salim, Parwis;
Müller, Alexander
Intraoperative Recording of Auditory Brainstem Responses for Monitoring of Floating Mass Transducer Coupling Efficacy During Revision Surgery—Proof of Concept
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Media type:
E-Article
Title:
Intraoperative Recording of Auditory Brainstem Responses for Monitoring of Floating Mass Transducer Coupling Efficacy During Revision Surgery—Proof of Concept
Contributor:
Fröhlich, Laura;
Rahne, Torsten;
Plontke, Stefan K.;
Oberhoffner, Tobias;
Dziemba, Oliver;
Gadyuchko, Maria;
Hoth, Sebastian;
Mir-Salim, Parwis;
Müller, Alexander
Description:
Objective: The objective of the study was to measure auditory brainstem responses elicited by stimulation via a semi-implantable active middle ear implant with an electromagnetically driven floating mass transducer to quantify the coupling efficacy (=vibroplasty in situ thresholds – bone conduction thresholds) in a patient during a revision surgery. Patients: One patient, reimplanted with an active middle ear implant in a revision surgery. Intervention(s): Diagnostic. Main Outcome Measure(s): Intraoperative auditory brainstem responses evoked by stimulation via an active middle ear implant in a calibrated set-up directly indicating the coupling efficacy magnitude (auditory brainstem response threshold = coupling efficacy), as well as pre- and postoperative bone conduction and vibroplasty in situ thresholds. Results: The intraoperative auditory brainstem response threshold was detected at 0 dB nHL, i.e., the magnitude of coupling efficacy was determined intraoperatively to be 0 dB. The actual postoperative coupling efficacy (=postoperative vibroplasty in situ – postoperative bone conduction thresholds) was –2.5 dB. Conclusions: The coupling efficacy determined intraoperatively was consistent with the postoperative coupling efficacy. The described method seems to be a promising tool to objectively quantify the magnitude of coupling efficacy in active middle ear implant surgeries.