MRI bij patiënten met een cochleair implantaat

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Klinische les
01-05-2019
Berry de Vos, Fuat Ziylan, Esther Sanchez, Cas Smits en Paul Merkus

Dames en Heren,

Per jaar krijgen meer dan 500 patiënten in Nederland een cochleair implantaat (CI) als behandeling van ernstige perceptieve slechthorendheid. In Nederland zijn tot eind 2017 al ruim 7500 CI-operaties verricht bij 6600 personen. Het voorkómen van een incident met het implantaat is van groot belang voor de patiënten, omdat hun communicatie hier sterk afhankelijk van is.

MRI in patients with a cochlear implant: how to proceed

An increasing number of cochlear implantations are being performed for the treatment of severe sensorineural hearing loss. Implant-associated complications leading to malfunction are of major importance since patients are strongly dependent on their cochlear implant (CI) for communication. Here we describe two patients with a CI who underwent MRI for diagnostic purposes and which resulted in dislocation of the internal CI magnet. CIs are generally non-compatible with MRI. However, by taking precautionary measures it is possible to perform MRI under certain conditions, depending on the type of CI and the magnetic flux density of the MRI scanner. When using 1.5 Tesla equipment, a firm bandage is required to prevent the CI magnet from dislocating. If 3 Tesla equipment is used, almost all CIs must be surgically removed prior to scanning. Despite these precautionary measures, the risk of complications still exists. Patient, referring physician and radiologist should be aware of the risks and disadvantages of performing MRI in patients with a CI.

Conflict of interest and financial support: none declared.