Risk of magnetic resonance imaging-induced magnet dislocation for different types of cochlear implants: a single-center retrospective study

Rupp R, Balk M, Sievert M, Leibl V, Schleder S, Allner M, Iro H, Hoppe U, Hornung J, Gostian AO (2023)

Publication Type: Journal article

Publication year: 2023

Journal

Journal of Otolaryngology-Head & Neck Surgery BioMed Central

Book Volume: 52

Article Number: 28

Journal Issue: 1

DOI: 10.1186/s40463-023-00633-w

Abstract

Background: When performing magnetic resonance imaging (MRI) in patients with a cochlear implant (CI), complication rates vary widely in the literature. The primary objective of this retrospective study was to determine the prevalence of complications, in particular magnet dislocation, in patients with CI undergoing 1.5 Tesla (T) MRI. As a secondary objective, the prevalence of magnet dislocation for specific cochlear implant device types was elaborated. Methods: In a single-center retrospective study, all patients with a cochlear implant presenting for an MRI examination at 1.5 T at our institution between January 1st, 2010 and December 31st, 2020 were included. Implants with axial and diametrical magnets were included in the study. MRI safety measures were applied before imaging. The prevalence of complications was evaluated. Magnet dislocation rates were calculated for device types with at least 20 MRI exposures. Results: During the study period, 196 MRI examinations were performed in a total of 128 patients, accounting for 149 different implants (21 implanted bilaterally) with a total of 231 implant exposures to MRI (average 1.69 ± 1.57; min. 1, max. 12). Complications were reported in 50 out of 231 cochlear implant exposures (21.6%). Magnet dislocation occurred in a total of 27 cases (11.7%). Dislocation rates were 29.6% for the Cochlear® CI500 series (24 dislocations from 81 exposures), 1.1% for the Cochlear® CI24RE series (1 from 87) and 0% for the MED-EL® Synchrony (0 from 36). The dislocation rate for the CI500 was significantly higher than for the CI24RE (χ2(1) = 26.86; p < 0.001; ϕ = 0.40) or the Synchrony (χ2(1) = 13.42; p < 0.001; ϕ = 0.34). Conclusions: For 1.5 T MRI, the risk of magnet dislocation ranges from 0 to 29.6% and depends on the CI device type. Implants with a diametrical magnet can be considered potentially MRI-safe, whereas in CIs with axial magnets, the CI500 is at high risk of magnet dislocation. Therefore, apart from a strict indication for an MRI and adherence to safety protocols, post-MRI follow-up examination to rule out magnet dislocation is recommended. Graphical Abstract: [Figure not available: see fulltext.].

Authors with CRIS profile

Robin Rupp Department of Otorhinolaryngology – Head and Neck Surgery Matthias Balk Department of Otorhinolaryngology – Head and Neck Surgery Matti Sievert Department of Otorhinolaryngology – Head and Neck Surgery Victoria Leibl Department of Otorhinolaryngology – Head and Neck Surgery Moritz Allner Department of Otorhinolaryngology – Head and Neck Surgery Heinrich Iro Lehrstuhl für Hals-, Nasen- und Ohrenheilkunde Ulrich Hoppe Professur für Audiologie Joachim Hornung Department of Otorhinolaryngology – Head and Neck Surgery Antoniu-Oreste Gostian Department of Otorhinolaryngology – Head and Neck Surgery

Involved external institutions

Klinikum St. Elisabeth Straubing GmbH DE Germany (DE)

How to cite

APA:

Rupp, R., Balk, M., Sievert, M., Leibl, V., Schleder, S., Allner, M.,... Gostian, A.-O. (2023). Risk of magnetic resonance imaging-induced magnet dislocation for different types of cochlear implants: a single-center retrospective study. Journal of Otolaryngology-Head & Neck Surgery, 52(1). https://doi.org/10.1186/s40463-023-00633-w

MLA:

Rupp, Robin, et al. "Risk of magnetic resonance imaging-induced magnet dislocation for different types of cochlear implants: a single-center retrospective study." Journal of Otolaryngology-Head & Neck Surgery 52.1 (2023).

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