NEW YORK (Reuters Health) – Magnetic resonance imaging (MRI) machines may displace the magnets of cochlear implants or cause extreme discomfort for some wearers, according to a new study.
More than 300,000 people worldwide now have a cochlear implant, a small electronic device with an external transmitter held in place behind the ear with a magnet and an internal electrode array. The devices can help restore a sense of hearing to the profoundly deaf, according to the National Institute on Deafness and Other Communication Disorders.
“There have been several reports of adverse events, such as magnet displacement and polarity changes, following MRI in patients with cochlear implants,” said senior author Dr. Jae Young Choi of the Department of Otorhinolaryngology at Yonsei University College of Medicine in Seoul, South Korea. “The exposure of the internal magnet to a strong electromagnetic field can induce significant magnetic forces and cause displacement of the implant.”
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May 22, 2014
INDIANAPOLIS -- Children with profound deafness who receive a cochlear implant had as much as five times the risk of having delays in areas of working memory, controlled attention, planning and conceptual learning as children with normal hearing, according to Indiana University research published May 22 in the Journal of the American Medical Association Otolaryngology--Head and Neck Surgery.
The authors evaluated 73 children implanted before age 7 and 78 children with normal hearing to determine the risk of deficits in executive functioning behaviors in everyday life.
Executive functioning, a set of mental processes involved in regulating and directing thinking and behavior, is important for focusing and attaining goals in daily life. All children in the study had average to above-average IQ scores. The results, reported in "Neurocognitive Risk in Children With Cochlear Implants," are the first from a large-scale study to compare real-world executive functioning behavior in children with cochlear implants and those with normal hearing.
A cochlear implant device consists of an external component that processes sound into electrical signals that are sent to an internal receiver and electrodes that stimulate the auditory nerve. Although the device restores the ability to perceive many sounds to children who are born deaf, some details and nuances of hearing are lost in the process.
First author William Kronenberger, Ph.D., professor of clinical psychology in psychiatry at the IU School of Medicine and a specialist in neurocognitive and executive function testing, said that delays in executive functioning have been commonly reported by parents and others who work with children with cochlear implants. Based on these observations, his group sought to evaluate whether elevated risks of delays in executive functioning in children with cochlear implants exist, and what components of executive functioning were affected.
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