Cochlear implant; OTOPLAN®; Software; Otorhinolaryngology; Speech and Hearing
Abstract :
[en] [en] OBJECTIVE: The purpose of this study was to compare the originally applied frequency allocation of cochlear implant electrodes assigned by default at the time of activation with a more recent frequency allocation that is anatomy-based by a software called OTOPLAN®. Based on a computed tomography scan of the temporal bone, this software calculates the position of each electrode in the cochlea and its corresponding tonotopic frequency. We also evaluated whether patients with a significant mismatch between these two allocations present poorer speech intelligibility.
MATERIALS AND METHODS: Patients who underwent cochlear implantation from 2016 to 2021 at the University Hospital of Liege were included in this retrospective study. We used OTOPLAN® to calculate the tonotopic frequency allocation of each electrode according to its exact position in the cochlear duct. This anatomical frequency mapping was compared with the default frequency mapping at the time of cochlear implant activation. Finally, we compared the mismatch with the patients' auditory performance, represented by the Auditory Capacity Index (ACI).
RESULTS: Thirteen patients were included in the study. All patients had a mismatch between the two frequency maps, to a variable extent (200 Hz-1,100 Hz). Frequency shift was significantly inversely correlated with ACI and with the time needed to improve speech intelligibility.
CONCLUSION: Our primary results show that patients with a larger mismatch between default frequency mapping and anatomically assigned frequency mapping experience poorer hearing performance and slower adaptation to a cochlear implant.
Disciplines :
Otolaryngology
Author, co-author :
Dessard, Laura; Department of Otorhinolaryngology, CHU, Liège, Belgium
Gersdorff, Guillaume ; Centre Hospitalier Universitaire de Liège - CHU > > Service d'ORL, d'audiophonologie et de chir. cervico-faciale
Ivanovik, Nicola; Medel, Innsbruck, Austria
Zoca-Assadi, Masoud; Medel, Innsbruck, Austria
Nopp, Peter; Medel, Innsbruck, Austria
CAMBY, Séverine ; Centre Hospitalier Universitaire de Liège - CHU > > Service de chirurgie plastique et maxillo-faciale
Lefèbvre, Philippe ; Université de Liège - ULiège > Département des sciences cliniques > Oto-rhino-laryngologie et audiophonologie
Language :
English
Title :
Cochlear Implant: Analysis of the Frequency-to-Place Mismatch with the Table-Based Software OTOPLAN® and Its Influence on Hearing Performance.
Blamey P, Artieres F, Başkent D, Bergeron F, Beynon A, Burke E. Factors affecting auditory performance of postlinguistically deaf adults using cochlear implants: an update with 2,251 patients. Audiol Neurotol. 2013; 18 (1): 36-47.
Holden LK, Finley CC, Firszt JB, Holden TA, Brenner C, Potts LG. Factors affecting open-set word recognition in adults with cochlear implants. Ear Hear. 2013; 34 (3): 342-60.
Van Der Beek FB, Briaire JJ, Van Der Marel KS, Verbist BM, Frijns JHM. Intracochlear position of cochlear implants determined using CT scanning versus fitting levels: higher threshold levels at basal turn. Audiol Neurotol. 2016; 21 (1): 54-67.
Finley CC, Holden TA, Holden LK, Whiting BR, Chole RA, Neely GJ. Role of electrode placement as a contributor to variability in cochlear implant outcomes. Otol Neurotol. 2008; 29 (7): 920-8.
Buchman CA, Dillon MT, King ER, Adunka MC, Adunka O, Pillsbury HC. Influence of cochlear implant insertion depth on performance: a prospective randomized trial. Otol Neurotol. 2014; 35 (10): 1773-9.
Alexiades G, Dhanasingh A, Jolly C. Method to estimate the complete and two-turn cochlear duct length. Otol Neurotol. 2015; 36 (5): 904-7.
Escudé B, James C, Deguine O, Cochard N, Eter E, Fraysse B. The size of the cochlea and predictions of insertion depth angles for cochlear implant electrodes. Audiol Neurotol. 2006 11 Suppl 1 27-33.
Spiegel JL, Polterauer D, Hempel JM, Canis M, Spiro JE, Müller J. Variation of the cochlear anatomy and cochlea duct length: analysis with a new tablet-based software. Eur Arch Otorhinolaryngol. 2022; 279 (4): 1851-61.
Landsberger DM, Svrakic M, Roland JT Jr, Svirsky M. The relationship between insertion angles, default frequency allocations, and spiral ganglion place pitch in cochlear implants. Ear Hear. 2015; 36 (5): e207-13.
Mertens G, Van de Heyning P, Vanderveken O, Topsakal V, Van Rompaey V. The smaller the frequency-to-place mismatch the better the hearing outcomes in cochlear implant recipients. Eur Arch Otorhinolaryngol. 2022; 279 (4): 1875-83.
Di Maro F, Carner M, Sacchetto A, Soloperto D, Marchioni D. Frequency reallocation based on cochlear place frequencies in cochlear implants: a pilot study. Eur Arch Otorhinolaryngol. 2022; 279 (10): 4719-25.
Canfarotta MW, Dillon MT, Buss E, Pillsbury HC, Brown KD, O'Connell BP. Validating a new tablet-based tool in the determination of cochlear implant angular insertion depth. Otol Neurotol. 2019; 40 (8): 1006-10.
Schurzig D, Timm ME, Batsoulis C, Salcher R, Sieber D, Jolly C. A novel method for clinical cochlear duct length estimation toward patient-specific cochlear implant selection. OTO Open. 2018 2 4 2473974X18800238.
Canfarotta MW, Dillon MT, Buss E, Pillsbury HC, Brown KD, O'Connell BP. Frequency-to-place mismatch: characterizing variability and the influence on speech perception outcomes in cochlear implant recipients. Ear Hear. 2020; 41 (5): 1349-61.
Venail F, Mathiolon C, Menjot De Champfleur S, Piron JP, Sicard M, Villemus F. Effects of electrode array length on frequency-place mismatch and speech perception with cochlear implants. Audiol Neurotol. 2015; 20 (2): 102-11.
Lambriks L, van Hoof M, Debruyne J, Janssen M, Chalupper J, van der Heijden K. Imaging-based frequency mapping for cochlear implants: evaluated using a daily randomized controlled trial. Front Neurosci. 2023; 17: 1119933.
Reiss LAJ, Turner CW, Karsten SA, Gantz BJ. Plasticity in human pitch perception induced by tonotopically mismatched electro-acoustic stimulation. Neuroscience. 2014; 256: 43-52.
Adunka O, Unkelbach M, Mack M, Radeloff A, Gstoettner W. Predicting basal cochlear length for electric-acoustic stimulation. Arch Otolaryngol Head Neck Surg. 2005; 131 (6): 488-92.
Kawano A, Seldon H, Clark G. Computer-aided three-dimensional reconstruction in human cochlear maps: measurement of the lengths of organ of Corti, outer wall, inner wall, and Rosenthal's canal. Ann Otol Rhinol Laryngol. 1996; 105 (9): 701-9.
