What Should Be Done About Hearing Loss?
By
THE NEW YORK TIMES
Published: February 27, 2013
Dr. DiSarno is chief staff officer for audiology at the American Speech-Language-Hearing Association, and from 1998 to 2012 was chairman of the department of communication sciences and disorders at Missouri State University.
Neil J. DiSarno of the American Speech-Language-Hearing Association.
Because of the large response, not all questions can be answered
individually. Dr. DiSarno is selecting representative questions on
similar topics, and a second set of answers will appear on Booming next Wednesday. This feature is now closed to new questions.
Dr. DiSarno’s first set of answers follows.
As is quite evident from the number of comments readers sent in, hearing
loss affects large numbers of baby boomers.
Although I would like to
have the time to answer each question individually, that is not
possible.
Those of you who have read the comments, however, see that
they fall pretty neatly into seven or eight categories. I will address
the questions by topic area.
First I would like to point out that although the effects of hearing
loss differ as a result of type and degree of impairment, one important
aspect to be mindful of is that the use of hearing aids is only part of a
plan of treatment.
Although it is a prime component, amplification in
the form of hearing aids only brings sounds closer to the individual.
How the individual’s auditory system processes that information differs
considerably among those with impaired hearing.
This is one reason some
individuals benefit greatly from the use of hearing aids and others
somewhat less.
The treatment following the fitting of hearing aids includes extensive
counseling that is tailored to the degree of impairment as well as the
lifestyle of the individual user.
Hearing aid users must establish
realistic expectations with regard to the benefit they can expect.
Although hearing aids have become more technologically advanced in
recent years, it must be kept in mind that the auditory system is the
most complex organ in the human body.
When it becomes altered, either
through the process of normal aging, or other health-related factors, it
can leave the individual with limitations ranging from an inability to
hear soft speech which is easily addressed by hearing aids, to complete
inability to understand any speech information, even when using very
powerful hearing aids.
Another factor to consider is the change that occurs in how the brain
processes speech.
Consider this example. A twenty-something and a
sixty-something both have their hearing checked and learn that hearing
is within normal limits.
Each individual receives a cellphone call while
dining in a very noisy restaurant.
If you are me, you are amazed that
the twenty-something appears to have no difficulty at all understanding
the conversation.
The sixty-something on the other hand can barely
understand who they are speaking with, much less what is being said.
Remember, each had quite good hearing on a hearing test.
The brain’s ability to understand speech in background noise undergoes
changes and this imposes limitations on how the aging auditory system
processes speech under those circumstances.
Now, add a bit of hearing
loss or a foreign accent to the cell phone situation and you can
imagine, or probably already live with that frustration.
Help can be
found for many of the limitations impaired hearing imposes on an
individual; however, appropriate counseling and realistic expectations
are key to successful rehabilitation.
Please understand that any advice in this section is provided without
the benefit of seeing you as a patient.
It is only with the knowledge of
a complete medical history and a thorough audiological evaluation that
accurate information can be provided.
Please allow this to serve as a
stepping-off point to allow you to research your condition further and
to seek professional consultation
.
BACKGROUND NOISE
Q. After thorough testing, the Mayo Clinic told me that I had a
slight hearing loss, but my difficulty separating sounds (as in a noisy
restaurant) is caused by a brain function that can’t be alleviated by
audiology modifications.
What is the name of this disability, and are
people being sold hearing aids that can’t deal with it very
successfully? — George B., Creve Coeur, Mo.
Q. I only have hearing problems in certain situations, e.g., at
movies, crowded restaurants. If I got a hearing aid, would there be any
problem wearing it in just those situations? — John Fisher,
Winston-Salem, N.C.
A. Without seeing audiological test results from either
George B. or John Fisher it is difficult to provide consultation as to
whether hearing aids would help.
An important fact to keep in mind is
that most hearing loss occurs in the high-frequency range.
This is the
part of the hearing organ that typically produces awareness of sounds
such as “s”, “f”, “th”, “p”, and “t”.
An inability to hear these
consonant sounds can cause considerable confusion when listening to
speech. When listening in the presence of background noise, the damaged
high-frequency portion of your hearing organ cannot provide you with
accurate high-frequency speech information.
You may easily confuse the
word shoot with shoe, or hit with hip.
Your inability to hear these
high-frequency consonant sounds can certainly send your brain an
inaccurate message.
The fortunate part of this condition is that these high-frequency sounds
are some of the most visible sounds on a person’s lips.
So, if you are
able to see the speaker’s face, your brain can often fill in what your
ears may have misunderstood.
Positioning yourself in restaurants, at
family dinners, or group settings where you are able to see the
speaker’s face can improve your ability to follow conversation.
Can hearing aids help as well? A properly fit hearing aid may boost up
the damaged region of your hearing, in most cases this is the
high-frequency portion.
Depending on the degree of the damage, the
boosted high-frequency sounds can fill in where your damaged hearing
organ is lacking.
The extent of the benefit you may receive is dependent
upon several factors.
Certainly you must give your brain a chance to
get used to utilizing this new amplified information.
A trial period of
at least one month of consistent hearing aid use often times will
provide you with the answer.
TINNITUS
Q. I’ve had tinnitus on my left ear since August 2011 but it was not
annoying at first. Hearing tests show mild to moderate hearing loss on
my left ear; however, for some inexplicable reason my tinnitus got very
loud in October 2012. I suspect it was emotional stress.
I have tried
many things to lessen the sound and its effects on my mood and reaction
including a hearing aid but nothing seems to help. I am only 25 and the
hissing continues.
The sound is destroying my life day by day! It is not
life anymore it is torture.
Can you please recommend something a
college student like me can do to improve this unfortunate situation?
And do you have any further knowledge on acoustic neuromodulation
treatment offered in the U.K.? Thank you. — Henry, Sacramento
Q. Following surgery to repair a ruptured eardrum about five years
ago, I experienced a catastrophic loss of high-frequency hearing in one
ear.
I wear a hearing aid in that ear and can get by except in the
presence of high background noise (cocktail party effect).
However, I’ve
never completely adjusted to the tinnitus, which is not only intrusive
and distracting but wakes me up at night.
What are the latest
developments in overcoming tinnitus? And is there anything on the
horizon as far as hair cell regeneration? — Liza, Connecticut
Tinnitus refers to “ringing in the ears” or “head noises” when no other
sound is present.
Tinnitus can sound like hissing, roaring, pulsing,
whooshing, chirping, whistling or clicking. Tinnitus can occur in one
ear or both ears.
It is a symptom common to many problems.
While the
exact cause of tinnitus is unknown, it may be a symptom of other
problems like hearing loss, exposure to loud noise, ototoxic
medications, allergies or even too much wax in the ear canal.
If you
have tinnitus, chances are the cause will remain a mystery.
Both Henry and Liza as well as many others who have written are
experiencing the effects of tinnitus to the point where it is disruptive
to their lives, and both asked about the latest treatments.
An advocacy
group for tinnitus suffers is the American Tinnitus Association, and
this link
provides information about the latest research on tinnitus treatment,
including neuromodulation treatment.
With regard to hair cell
regeneration to replenish the damaged sensory hair cells, a critical
component to the hearing process, the National Institutes of Health provides
information regarding recent advances
in this area. Successes dealing with hair cell regeneration have so far
been limited to animal studies.
Some facts regarding tinnitus are:
¶One-third of all adults report experiencing tinnitus at some time in
their lives. Ten to 15 percent of adults have prolonged tinnitus
requiring medical/audiologic evaluation.
¶Up to 18 percent of the general population of industrialized countries
is mildly affected by chronic tinnitus, and 0.5 percent report tinnitus
having a severe effect on the ability to lead a normal life.
Tinnitus and hearing loss often go hand in hand. Contact an audiologist
to find out if your tinnitus symptoms also include hearing loss. For a
provider check here. If you have hearing loss as well as tinnitus, in some cases hearing aids can help.
Q. What is the latest research on tinnitus and treatments/cure?
Congress is looking at this issue because so many of our returning
military have tinnitus so hopefully that will mean more research dollars
to benefit them as well as the rest of us who have tinnitus. — Anne
Royal Oak, MI
A. New brain imaging techniques have led to insights
about the connections between structures and function within the ear and
in the cognitive process of the brain.
These new imaging techniques
suggest the possibility of more effective treatments for tinnitus and
hyperacusis (oversensitivity to normal sounds; see question below).
Imaging advances will also increase the knowledge about the plasticity
of the brain and its ability to compensate for hearing dysfunction.
Q. Following surgery to repair a ruptured eardrum about five years
ago, I experienced a catastrophic loss of high-frequency hearing in one
ear (complicated story). I wear a hearing aid in that ear and can get by
except in the presence of high background noise (cocktail party
effect). However, I’ve never completely adjusted to the tinnitus, which
is not only intrusive and distracting but wakes me up at night. What are
the latest developments in overcoming tinnitus? And is there anything
on the horizon as far as hair cell regeneration? – Liza, Connecticut
A. One area of exciting research involves inner ear
hair cell regeneration with the use of stem cells. The discovery of both
adult and embryonic stem cells in the inner ear and scientific evidence
that they can be converted into hair cells raises hope for the
development of stem-cell based treatments to regrow damaged hair cells.
Researchers are studying precisely how hearing may have been damaged
from exposure to loud noise or ear-damaging medications, known as
ototoxic medications.
This research is looking at the biology of the ear structures and
chemistry to understand the role of free radicals, highly reactive
molecules in the body.
Free radicals are a result of stress (oxidation)
on the inner ear tissues and can lead to cell death. Several
pharmaceutical interventions based on natural and synthetic antioxidants
are being studied.
AGE-RELATED HEARING LOSS
Q. I am 63 years old. I blame my “hearing loss” on cell phones and
poor audio quality of DVDs and inconsiderate people who talk from
distant rooms, but my wife is not buying it. I can hear fine if someone
speaks to me face to face, but . . . Is it me? — John, Memphis
Q. After thorough testing, Mayo Clinic told me I had slight hearing
loss, but my difficulty separating sounds (as in a noisy restaurant) is
caused by a brain function that can’t be alleviated by audiology
modifications. What is the name of this disability, and are people being
sold hearing “aids” that can’t deal with it very successfully? — George
B., Creve Coeur, Missouri
A. Age-related hearing loss, or presbycusis, is
increasing as the baby-boom generation grows older. Scientists are still
trying to determine whether the age-related deficit is mostly due to
loss of sensitivity in the inner ear. Increasingly, research suggests
that other areas within the hearing system may be affected.
For example,
it has been found that the brain processes sound less quickly with
advancing age.
This suggests that a major contributor to poor speech
understanding in older people is poor processing of sound in the brain.
Thus, simple hearing aid strategies that only address damage in the
inner ear by amplifying sound may not solve the communication problems
often expressed by older hearing aid users.
An emerging area of research is looking at a link between noise exposure
and the degree and rate of development of presbycusis.
What we know now
is that exposure to loud levels of noise over time will increase the
ear’s vulnerability to the aging process.
PAINFULLY LOUD SOUNDS
Q. Would like to learn more about “recruitment.” Although I have a
moderate to severe hearing loss, I notice that sounds that others can
tolerate are painfully loud to me. This seem paradoxical; can you
explain to me how and why this happens? — Jerry M., Little Rock, Ark.
Q. What is the latest information on helping people who have
tinnitus and hyperacusis caused by having a bad case of the flu or a
virus.
This happened to me in 1991 and actually the hyperacusis is
harder to deal with than the tinnitus, which never stops hissing and
screaming.
Have you seen any success with acupuncture treatment? —
Chadds Ford, Pa.
A. Recruitment is a condition sometimes observed in
people with known damage to the hair cells of the inner ear and/or the
damaged auditory nerve cells to which they are connected.
Although it
seems paradoxical, consider this situation. An individual without
hearing loss has a tone presented to one ear just barely above the level
he can hear (his hearing threshold) and he responds that yes, he hears a
very soft tone.
An individual with impaired hearing is also presented
with a tone that is just above his threshold of impaired hearing and he
reports that yes, he hears a very soft tone.
The level of the tone is
brought up the same amount (e.g., 20 dB additional) for the normal
hearing individual and he reports that the tone is a little louder.
The
same additional 20 dB of loudness is presented to the individual with
impaired hearing and he reports that the new tone is much louder than
the original tone and may be approaching a painfully loud level.
The
impaired ear is experiencing an abnormal growth of loudness.
Recruitment
is defined as an abnormal perception of loudness and is seen in some
people with sensory and/or neural hearing loss.
Hyperacusis is a rare hearing disorder that causes sounds which would
otherwise seem normal to most people to sound unbearably loud.
People
who suffer from hyperacusis may even find normal environmental sounds to
be too loud.
Hyperacusis is not discomfort around loud sounds.
Individuals with hyperacusis may find a car engine, dishes clanking,
rustling of paper or even loud conversation uncomfortable enough to
avoid such situations.
Many people with hyperacusis have normal hearing.
The disorder can occur
in one or both ears and is often accompanied by tinnitus (ringing or
buzzing in the ear). It is reported that 1 in 50,000 people has
hyperacusis and that 1 in 1,000 people who have tinnitus will also have
hyperacusis.
There are some diseases or disorders that are linked to hyperacusis,
like Bell’s palsy, chronic fatigue syndrome, Lyme disease, Ménière's
disease, post-traumatic stress disorder, depression and autism.
Additionally, hyperacusis is seen in patients who have experienced a
head trauma, such as an air bag deployment, surgery to the jaw or face,
or a viral infection of the inner ear.
One major cause of hyperacusis is loud noise exposure. It may be
triggered by a single intense noise such as a gunshot, or it may develop
gradually from listening to loud noise without hearing protection.
People exposed to loud levels of noise through their occupation, whether
as a machinist or a musician, should be protective of their hearing to
avoid noise-induced hearing loss and other changes in their hearing such
as tinnitus or hyperacusis.
Depending on the cause, hyperacusis may get better with time.
Specifically, in cases of trauma to the brain or hearing system, there
is a chance that the sensitivity to sounds will become more tolerable.
In cases where the cause is not clear, however, relief may not come on
its own.
I do not have any personal experience with acupuncture as a
successful treatment for hyperacusis.
Many people who suffer from hyperacusis get by in their everyday life by
wearing earplugs or earmuffs to reduce incoming sound levels that may
be bothersome or by withdrawing from social situations that may have
uncomfortable sounds present. This is a logical response.
But these strategies may not work — hyperacusis sufferers may be
furthering their poor tolerance to relatively soft sounds.
Wearing
earplugs or earmuffs may provide immediate relief from an environment
that seems uncomfortably loud, but when the individual eventually
removes the earplugs or earmuffs, that environment will seem even louder
than it might have otherwise.
On March 6, Booming will post Dr. DiSarno’s answers about hearing
aids, cochlear implants, genetic causes of hearing loss, ear wax and
other hearing issues.
Fuente: The New York Times
http://www.nytimes.com/2013/02/27/booming/what-should-be-done-about-hearing-loss.html?pagewanted=all