Noninvasive management of cochlear implant's inner magnet displacement after magnetic resonance

Nardo, Walter Di; Giannantonio, Sara; Schinaia, Lorenzo; Corso, Eugenio De; Paludetti, Gaetano

doi:10.1002/lary.23668

Cited by 23 publications

(16 citation statements)

References 42 publications

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“…Interestingly, the initial small cadaveric and patient series showed minimal to no issues with MRI safety for CI and auditory brainstem implants (ABI) . However, despite these initial findings, there has been a plethora of case reports and additional patient series that describe a relatively high frequency of MRI‐related CI complications …”

Section: Introductionmentioning

confidence: 99%

“…6,7,12 However, despite these initial findings, there has been a plethora of case reports and additional patient series that describe a relatively high frequency of MRI-related CI complications. 3,4,[13][14][15][16][17][18][19][20] Herein, we summarize the MRI safety and image quality in our series of 18 patients with CI or ABI who collectively have undergone a total of 62 postimplantation MRI scans. Our review offers a unique perspective compared to the literature on the variety of CI manufacturers used at our institution.…”

Section: Introductionmentioning

confidence: 99%

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Magnetic resonance imaging with cochlear implants and auditory brainstem implants: Are we truly practicing MRI safety?

et al. 2018

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Objective Our objective is to evaluate the safety in patients with cochlear implants (CIs) and auditory brainstem implants (ABI) undergoing 1.5 Tesla (T) magnetic resonance imaging (MRI). Secondly, we want to raise awareness on CI and MRI safety, and advocate for continued improvement and advancement to minimize morbidity for our CI patients. Methods Retrospective case series from 2006 to 2018 at a single tertiary academic center. Data was collected on patients with CI or auditory brainstem implants undergoing MRI. Outcomes collected include demographic data, age at time of MRI, MRI characteristics, complications, CI manufacturer, and image quality. Results Eighteen patients with CI or ABI collectively underwent a total of 62 MRI scans. Five of 15 (33%) CI patients with magnet had complications: five total of 24 MRI scans (21%). Two patients had magnet removal prior to 29 MRI scans without complications. Four of five MRI‐related complications were equipped with a U.S. Food and Drug Administration‐approved head wrap. Three of five required a trip to the operating room to explore and reposition the CI magnet; two could not complete MRI secondary to pain. Of the complications, two were Cochlear (Sydney, Australia), two Advanced Bionics (Valencia, CA), and one MED‐EL (Innsbruck, Austria). Synchrony model (MED‐EL) had 0 of seven complications, with a total of 19 MRI scans, which features a freely rotating and self‐aligning magnet. Conclusion Our series offers a diverse number of CI manufacturers and is in accordance with other literature that CI MRI‐related adverse events are occurring at an unacceptable frequency. We can promote CI MRI safety through our institutions' MRI CI patient protocols, raise awareness that diagnostic MRI benefits must outweigh CI‐related complications, and advocate for continued industry technological innovation. Level of Evidence 4 Laryngoscope, 129:482–489, 2019

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Magnetic resonance imaging with cochlear implants and auditory brainstem implants: Are we truly practicing MRI safety?

et al. 2018

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“…This is a crucial difference between this case and Di Nardo's. 13) During the MR scan, the internal magnet is subjected to forces by a magnetic field. Eerkens reported main cause for magnet dislocation is rotational force in magnetic field of MRI.…”

Section: Discussionmentioning

confidence: 99%

“…Actually there is one case of vertical displacement of internal magnet after MRI. 13) Therefore, given these conditions, it could be possible that the reversed magnet wasn't fully anchored in the silicone bed at the first reversal event. Especially in this case, magnet is positioned in vertical direction at first, and reversed while the patient pressed with her one hand without any confirmation of axis or center of the magnet.…”

Section: Discussionmentioning

confidence: 99%

“…Compressive bandage before MRI is recommended to prevent these magnet-related complications in CI recipients. 13,15) However, even after compressive bandaging, complications related to internal magnet displacement or reversal have been reported. 12,16,17) In Crane groups' study, all CI recipients with mold material and gauze bandaging showed no CI malfunction or magnet displacement after MRI.…”

Section: Discussionmentioning

confidence: 99%

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Spontaneous Extrusion of a Reversed Internal Magnet of a Cochlear Implant

Kim¹,

Choi²,

Oh³

et al. 2021

J Clin Otolaryngol Head Neck Surg

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With the increasing of cochlear implantation, necessity of magnetic resonance imaging (MRI) of cochlear implant (CI) recipients is also increasing. This patient was previously reported as a case of reversion of internal magnet of CI after undergoing MRI. At that time, the CI device functioned normally after the polarity reversion of external device. Eight years later from that event, the patient came for sudden functional loss of the CI. Then, we found the patient's internal magnet of CI was spontaneously extruded through the skin. The function of CI was perfectly recovered after the surgery for insertion of internal magnet.

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