On the relation of magnetic resonance imaging (MRI) in hearing implant patients and the probability of associated medical complications

Magnetic resonance imaging (MRI) is used in Cochlear Implant (CI) patients for diagnostic measures. Interactions with the implanted magnetic components may pose a risk. The aim of this study is to assess the frequency of MRI scans in CI patients and the probability of associated medical complications.

130 CI patients were asked to fill in questionnaires regarding past MRI scans during regular follow-up appointments. Examined body region, safety precautions and symptoms during the scan were assessed. Radiological reports and applied magnetic field strengths were further collected.

1 – 3 (mean 1.7) MRI scans were used in 17 patients. Examined body areas included the head (6), lower extremities (4), lumbar (3) and cervical spine (2), shoulder and hip (each 1). In a single case the magnetic field strength was 1 Tesla, all other scans were conducted at 1.5 Tesla. Magnetic components were never removed. Safety dressings were used in 15 scans. 7 patients reported about pain during the examination. Dislocation of the magnetic components occurred in 3 patients while safety dressings were used in 2 cases. 2 Patients needed surgical treatment whereas manual reduction of the magnetic component was sufficient in one case.

MRI scans are common in CI patients (13% in this study). Therefore the medical need should be carefully considered individually and a structured approach during examination is necessary. Patients should be informed on the risk of examination related pain and magnetic component dislocation (18% in this study) despite safety precautions such as dressings.

Publication History

Publication Date:
23 April 2019 (online)