OBJECTIVE: To report the feasibility of monitoring cochlear function during cochlear implantation. STUDY DESIGN: Case report. SETTING: Tertiary care referral center. METHODS: A child with audiologic features typical of bilateral auditory neuropathy underwent cochlear implantation. The scala tympani was entered inferior and slightly anterior to the round window membrane margin and smooth electrode insertion was achieved. Using single polarity click stimuli, the cochlear microphonic was measured at several steps during surgery. RESULTS: Cochlear microphonics were present at all stages during the implantation process and were clearly distinguished from neural responses by stimulus polarity inversion and constant latencies, despite changes in stimulus level. With the electrode in situ, amplitudes were smaller but persisted until the final measurement at 10 minutes after insertion. At follow-up 2 weeks after surgery, behavioral audiometry results indicated profound hearing loss in the operated ear. CONCLUSIONS: This paper demonstrates the feasibility of monitoring cochlear function during cochlear implantation. The routine surgical approach did not appear to adversely affect the functional measurements. Standard size, full electrode insertion did diminish the amplitude of the cochlear microphonics, possibly as a result of intracochlear mechanical impairment. Ultimately, profound hearing loss was documented, indicating that factors other than immediate changes induced by electrode insertion were likely responsible for the loss of cochlear function.
OBJECTIVE: To report the feasibility of monitoring cochlear function during cochlear implantation. STUDY DESIGN: Case report. SETTING: Tertiary care referral center. METHODS: A child with audiologic features typical of bilateral auditory neuropathy underwent cochlear implantation. The scala tympani was entered inferior and slightly anterior to the round window membrane margin and smooth electrode insertion was achieved. Using single polarity click stimuli, the cochlear microphonic was measured at several steps during surgery. RESULTS: Cochlear microphonics were present at all stages during the implantation process and were clearly distinguished from neural responses by stimulus polarity inversion and constant latencies, despite changes in stimulus level. With the electrode in situ, amplitudes were smaller but persisted until the final measurement at 10 minutes after insertion. At follow-up 2 weeks after surgery, behavioral audiometry results indicated profound hearing loss in the operated ear. CONCLUSIONS: This paper demonstrates the feasibility of monitoring cochlear function during cochlear implantation. The routine surgical approach did not appear to adversely affect the functional measurements. Standard size, full electrode insertion did diminish the amplitude of the cochlear microphonics, possibly as a result of intracochlear mechanical impairment. Ultimately, profound hearing loss was documented, indicating that factors other than immediate changes induced by electrode insertion were likely responsible for the loss of cochlear function.
Authors: Christine DeMason; Baishakhi Choudhury; Faisal Ahmad; Douglas C Fitzpatrick; Jacob Wang; Craig A Buchman; Oliver F Adunka Journal: Ear Hear Date: 2012 Jul-Aug Impact factor: 3.570
Authors: William J Riggs; Robert T Dwyer; Jourdan T Holder; Jameson K Mattingly; Amanda Ortmann; Jack H Noble; Benoit M Dawant; Carla V Valenzuela; Brendan P O'Connell; Michael S Harris; Leonid M Litvak; Kanthaiah Koka; Craig A Buchman; Robert F Labadie; Oliver F Adunka Journal: Otol Neurotol Date: 2019-06 Impact factor: 2.311
Authors: Oliver F Adunka; Christopher K Giardina; Eric J Formeister; Baishakhi Choudhury; Craig A Buchman; Douglas C Fitzpatrick Journal: Laryngoscope Date: 2015-09-11 Impact factor: 3.325
Authors: John S Oghalai; Ross Tonini; Jamie Rasmus; Claudia Emery; Spiros Manolidis; Jeffrey T Vrabec; Joann Haymond Journal: Cochlear Implants Int Date: 2009-03
Authors: Christofer W Bester; Luke Campbell; Adrian Dragovic; Aaron Collins; Stephen J O'Leary Journal: Front Neurosci Date: 2017-03-23 Impact factor: 4.677
Authors: Andreas Buechner; Michael Bardt; Sabine Haumann; Gunnar Geissler; Rolf Salcher; Thomas Lenarz Journal: PLoS One Date: 2022-04-22 Impact factor: 3.752
Authors: José Santos Cruz de Andrade; Peter Baumhoff; Oswaldo Laércio Mendonça Cruz; Thomas Lenarz; Andrej Kral Journal: Braz J Otorhinolaryngol Date: 2020-09-20