Intraoperative Recording of Auditory Brainstem Responses for Monitoring of Floating Mass Transducer Coupling Efficacy During Revision Surgery—Proof of Concept. Issue 2 (February 2020)

• Record Type: Journal Article
• Authors: Fröhlich, Laura; Rahne, Torsten; Plontke, Stefan K.; Oberhoffner, Tobias; Dziemba, Oliver; Gadyuchko, Maria; Hoth, Sebastian; Mir-Salim, Parwis; Müller, Alexander
• Is Part Of: Otology & neurotology. Volume 41:Issue 2(2020)
• Publication Date: 2020-02
• Subjects: Active middle ear implant -- Coupling efficiency -- Floating mass transducer -- Intraoperative -- Objective measures; Otology -- Periodicals; Ear -- Diseases -- Periodicals; Skull base -- Surgery -- Periodicals; 617.8005
• DOI: 10.1097/MAO.0000000000002511
• Languages: English
• ISSNs: 1531-7129

Abstract

Abstract : 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.