External hearing aids are included in the category of electronically-activated devices that may be found in patients referred for MR procedures. Exposure to the magnetic fields used for MR examinations can damage these devices. Therefore, a patient or other individual with an external hearing aid must not enter the MR system room. Fortunately, most external hearing aids can be readily identified and removed from the patient or individual to prevent damage associated with the MRI environment.
Other hearing devices may have external components as well as pieces that are surgically implanted. Hearing devices with external and internal components may be especially problematic for patients and individuals in relative to the use of MR procedures. Accordingly, patients and individuals with these particular hearing devices may not be allowed into the MR environment because of the risk of damage to the components. The manufacturers of these devices should be contacted for current MRI labeling information.
For information on other hearing systems, please refer to other sections, including: Baha, Bone Conduction Implant; Cochlear Implants, Sophono Alpha Magnetic Implant; and InSound XT Series and Lyric Hearing Device.
MR healthcare professionals are advised to contact the respective manufacturer in order to obtain the latest safety information to ensure patient safety relative to the use of an MR procedure.
Azadarmaki R, et al. MRI information for commonly used otologic implants: review and update. Otolaryngol Head Neck Surg 2014;150:512-9.
Shellock FG. Magnetic Resonance Procedures: Health Effects and Safety. CRC Press, LLC, Boca Raton, FL, 2001.