OBJECTIVE: To evaluate the effect of the intracochlear electrode position on the residual hearing and VNG- and cVEMP responses. DESIGN: Prospective pilot study. STUDY SAMPLE: Thirteen adult patients who underwent unilateral cochlear implant surgery were examined with high-resolution rotational tomography after cochlear implantation. All subjects were also tested with VNG, and 12 of the subjects were tested with cVEMP and audiometry before and after surgery. RESULTS: We found that although the electrode was originally planned to be positioned inside the scala tympani, only 8 of 13 had full insertion into the scala tympani. Loss of cVEMP response occurred to the same extent in the group with full scala tympani positioning and the group with scala vestibuli involvement. There was a non-significant difference in the loss of caloric response and residual hearing between the two groups. Interscalar dislocation of the electrode inside the cochlea was observed in two patients. A higher loss of residual hearing could be seen in the group with electrode dislocation between the scalae. CONCLUSIONS: Our findings indicate that intracochlear electrode dislocation is a possible cause to loss of residual hearing during cochlear implantation but cannot be the sole cause of postoperative vestibular loss.
OBJECTIVE: To evaluate the effect of the intracochlear electrode position on the residual hearing and VNG- and cVEMP responses. DESIGN: Prospective pilot study. STUDY SAMPLE: Thirteen adult patients who underwent unilateral cochlear implant surgery were examined with high-resolution rotational tomography after cochlear implantation. All subjects were also tested with VNG, and 12 of the subjects were tested with cVEMP and audiometry before and after surgery. RESULTS: We found that although the electrode was originally planned to be positioned inside the scala tympani, only 8 of 13 had full insertion into the scala tympani. Loss of cVEMP response occurred to the same extent in the group with full scala tympani positioning and the group with scala vestibuli involvement. There was a non-significant difference in the loss of caloric response and residual hearing between the two groups. Interscalar dislocation of the electrode inside the cochlea was observed in two patients. A higher loss of residual hearing could be seen in the group with electrode dislocation between the scalae. CONCLUSIONS: Our findings indicate that intracochlear electrode dislocation is a possible cause to loss of residual hearing during cochlear implantation but cannot be the sole cause of postoperative vestibular loss.
Authors: Brendan P O'Connell; Ahmet Cakir; Jacob B Hunter; David O Francis; Jack H Noble; Robert F Labadie; Geraldine Zuniga; Benoit M Dawant; Alejandro Rivas; George B Wanna Journal: Otol Neurotol Date: 2016-09 Impact factor: 2.311
Authors: Manuel Christoph Ketterer; A Aschendorff; S Arndt; I Speck; A K Rauch; R Beck; F Hassepass Journal: Eur Arch Otorhinolaryngol Date: 2020-10-22 Impact factor: 2.503
Authors: Paul Van de Heyning; Peter Roland; Luis Lassaletta; Sumit Agrawal; Marcus Atlas; Wolf-Dieter Baumgartner; Kevin Brown; Marco Caversaccio; Stefan Dazert; Wolfgang Gstoettner; Rudolf Hagen; Abdulrahman Hagr; Greg Eigner Jablonski; Mohan Kameswaran; Vladislav Kuzovkov; Martin Leinung; Yongxin Li; Andreas Loth; Astrid Magele; Robert Mlynski; Joachim Mueller; Lorne Parnes; Andreas Radeloff; Chris Raine; Gunesh Rajan; Joachim Schmutzhard; Henryk Skarzynski; Piotr H Skarzynski; Georg Sprinzl; Hinrich Staecker; Timo Stöver; Dayse Tavora-Viera; Vedat Topsakal; Shin-Ichi Usami; Vincent Van Rompaey; Nora M Weiss; Wilhelm Wimmer; Mario Zernotti; Javier Gavilan Journal: Front Surg Date: 2022-03-24