Radiologic Measurement of Cochlea and Hearing Preservation Rate Using Slim Straight Electrode (CI422) and Round Window Approach

Overview

Journal Acta Otorhinolaryngol Ital

Specialty Otorhinolaryngology

Date 2018 Dec 1

PMID 30498276

Citations 3

Authors

H Skarzynski

M Matusiak

M Furmanek

A Pilka

E Wlodarczyk

M Oldak

P H Skarzynski

Affiliations

Soon will be listed here.

Abstract

Hearing preservation surgery constitutes a considerable branch of cochlear implantation surgery and is being steadily developed and perfected. The aim of the study was to verify if insertion of a cochlear implant electrode according to individually calculated linear insertion depth improves hearing preservation. We evaluated the relations between the size of a cochlea, insertion depth angle, linear insertion depth and hearing preservation rate (HP) according to Hearing Preservation Classification in a retrospective case review of 54 patients implanted with a slim straight electrode Nucleus CI422 in 2008-2011. Group HP was 0.75 at activation, 0.67 at 12 months (for 53 patients) and 0.60 at 24 months. In 53 cases, the mean insertion depth angle was 375° (SD 17°); mean calculated cochlear duct length 35.87 mm (SD 1.95); mean calculated linear insertion depth 23.14 mm (SD 1.68). There was no significantly relevant relation between HP values and angular insertion depth or insertion depth. Preoperative measurements of cochlea and specific parameters such as linear insertion depth have no effect on hearing preservation. Poor hearing preservation in some deep insertion cases cannot be explained entirely by the electrode position.

Citing Articles

Evaluation of artifacts of cochlear implant electrodes in cone beam computed tomography.

Bevis N, Effertz T, Beutner D, Gueldner C Eur Arch Otorhinolaryngol. 2020; 278(5):1381-1386.

PMID: 32671538 PMC: 8057993. DOI: 10.1007/s00405-020-06198-y.

Preservation of residual hearing after cochlear implant surgery with slim modiolar electrode.

Iso-Mustajarvi M, Sipari S, Lopponen H, Dietz A Eur Arch Otorhinolaryngol. 2019; 277(2):367-375.

PMID: 31673779 PMC: 6981311. DOI: 10.1007/s00405-019-05708-x.

Hearing Preservation With the Use of Flex20 and Flex24 Electrodes in Patients With Partial Deafness.

Skarzynski P, Skarzynski H, Dziendziel B, Rajchel J, Gos E, Lorens A Otol Neurotol. 2019; 40(9):1153-1159.

PMID: 31318788 PMC: 6749963. DOI: 10.1097/MAO.0000000000002357.

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