Researchers Explore Why Candidates for Cochlear Implants Rarely Get Them

Sandra Prentiss, Ph.D.

Researchers from the Universities of Miami and Michigan surveyed U.S. audiologists from academic centers, hospitals and large cochlear implant centers, asking how they preoperatively assess adults for cochlear implant candidacy. Based on the 92 completed surveys analyzed for the study, the findings were “eye opening,” according to the paper’s lead author, Sandra Prentiss, Ph.D., CCC-A, assistant professor of otolaryngology at the University of Miami Miller School of Medicine.

Their results were published on Dec. 12 in JAMA Otolaryngology-Head and Neck Surgery.

“Currently, cochlear implant candidacy testing protocols are not streamlined. The survey identified wide variability in how clinics and providers are determining candidacy for patients who may benefit from the technology. The problem is that if there is too much variance, potential candidates will not have the same access to this good treatment option.”

Sandra Prentiss, Ph.D., CCC-A

Cochlear implants are a greatly under-utilized treatment for hearing loss. Dr. Prentiss said fewer than 9% of people who are candidates for cochlear implants use this technology. Part of the reason appears to be that the criteria for candidacy have changed in recent years and many providers do not know about the changes or have not implemented them in practice.

“Fifteen years ago, candidacy was pretty straightforward in that only people with severe-to-profound hearing loss were candidates,” Dr. Prentiss said.

Advances in surgical technique and electrode design have improved outcomes among cochlear implant patients. As a result, the FDA has expanded the criteria for cochlear implants to include people with lesser degrees of hearing loss. This includes elderly people with age-related hearing loss who have not benefited from hearing aids, according to Dr. Prentiss.

“We found that some audiologists are still using old testing methods which will not capture those people who have better than severe-to-profound hearing loss and could potentially benefit from cochlear implants,” she said. “This lack of knowledge of new criteria likely plays a large role in the under-utilization of this technology.”


Guidelines Remain Unclear on Testing


Another potential hurdle is there are no clear guidelines for how to best test patients. The testing should go well beyond what a person’s hearing looks like on paper, and should include assessing quality-of-life factors, the patient’s access and willingness to participate in rehabilitation exercises, and a patient’s cognitive state, according to Dr. Prentiss.

“We’ve seen that age alone is no longer a contraindication for cochlear implants. We have to be able to capture these people that have progressive hearing loss and are not doing well with hearing aids. Those patients may not have access to the technology because a lot of providers don’t realize that you can have quite a bit of hearing and still benefit from a cochlear implant,” she said.

The message to physicians who encounter patients complaining of hearing loss is to refer them for a cochlear implant evaluation, according to Dr. Prentiss.

“If you have a patient who is really struggling and his or her quality of life is going down because of hearing loss, it’s never a bad thing to refer that patient to get a cochlear implant evaluation. At least if they are referred, we can get an idea of how they are performing in noise and their overall quality of life. If they don’t meet candidacy criteria then maybe we have a baseline and can look for other options that might help them.”

Other solutions to the problem include developing clear guidelines for cochlear implant evaluations, as well as educating providers, including audiologists, about current best practices for determining if patients are candidates.

“I’m writing a paper with the support of the American Cochlear Implant Alliance, the largest national organization for cochlear implants, in an effort to inform hearing health care professionals what cochlear implant candidacy looks like today and when it may be appropriate to refer for an evaluation,” Dr. Prentiss said.

This national survey is a step toward identifying the eye-opening variability in preoperative assessment practices for evaluating and managing adults with hearing loss in the U.S. The ambiguity, according to Dr. Prentiss, highlights the potential risks for health care inequities, including access to care.


Source: University of Miami



  1. lets give some realism to the phenomenon of hearing and understanding hearing. The main pathway to understanding hearing is a cognitive action. This means that natural processing of environmental sounds needs to be accomplished before other cognitive assessments can be made by synaptic actions. The basis of understanding incoming sounds lies in localization the sounds in within the 360 degree halo that has the mapping of the environment occurring with 2ms updates:
    1. In a mild hearing loss, this update speed slows to 5-10 ms. In a severe hearing loss, this update degrades to approximately 100ms. This are speeds recorded in fixed acoustic conditions. If this is translated to real life open air spatial conditions, then it will be an exponential increase in time for detecting , sifting, and processing sounds before identification and cognitive placements.
    2. A single sided implant fitting further suffers localization degradation due to the placement of microphone at an unnatural position, and the solution for this is a bilateral fitting, which is not the norm currently. Therefore the implant user has a handicap when compared to a more natural acoustic incursion into the ear canal through a hearing aid.
    3. Hearing aid fittings enjoy natural processing through biologically identifiable amplification changes brought about in the ear canal, middle ear cavity and cochlear processing which can never be matched by any cochlear implant. Since the brain plastically selects the best processing routes at the hippocampus, these are redirected due to implant inputs and degrades cognitive capture that takes many months to re-route. Not a good experience for any implant candidate! This is the single reason why the satisfaction rate for CI’s is so low!!!!!

  2. How amazing that doctorate degree level practitioners in the field of audiology would be unaware of changing criteria for cochlear implant candidacy. Aren’t they required, as licensed professionals, to participate in advanced training opportunities that keep them on top of changes and advancements in their professional field? Yet, I know people who have become CI recipients in recent years, only after bringing up the possibility themselves with their AUD providers and ENT physicians. Somehow that doesn’t seem right.

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