HEARING LOSS

People often blame their hearing difficulty on the speaker.  It is easier to identify hearing loss in others than in yourself.  If you are honestly looking at your behavior, you should gain valuable insight.

Do you think you have a hearing problem?

Try and answer the following questions about your own behavior to determine if you need to seek an audiogram and medical examination of your ears.

  • Do you commonly strain to hear conversations?
  • Do you frequently ask for words to be repeated?
  • Do you have problems hearing the doorbell or telephone?
  • Do you misunderstand what others are saying or answer questions inappropriately?
  • Do people often sound as though they're speaking too softly?
  • Has someone close to you mentioned that you might have a problem with your hearing?
  • Do you turn up the television or radio louder than others would prefer?
  • Do you remove yourself from conversations or social situations because it is difficult to hear what is being said?
  • When you are socializing, does background noise bother you?

If you answered “yes” to any of the above questions you may consider being evaluated by a CCENT hearing professional.  A hearing evaluation can determine if you need help medically, surgically or if you need hearing aids.


DEFINITION OF HEARING LOSS

Hearing Loss Hearing Aids Fresno CA.

Hearing is determined by the audiogram.  Various tones are presented to each ear, and you will indicate whether each tone is heard or not.  Each ear is tested independently at various tones.  The degree of hearing is calculated in decibels (dB) of hearing loss.  Normal hearing is at least 20 dB or better.  A mild loss is 20-40 dB, moderate loss is 40-60 dB, and severe loss is 60-80 dB.  Profound loss, or near deafness, is 80 dB and beyond.  Hearing loss may be divided into two types:  conductive and sensorineural.

A conductive hearing loss is due to abnormalities of the ear canal, eardrum or middle ear structures which block the conduction of sound into the inner ear.  Therefore, wax in the ear, a hole in the eardrum, or fluid behind the eardrum may cause conductive hearing loss.  Conductive hearing loss is usually treatable and may resolve completely. 

In contrast, sensorineural hearing loss, or nerve hearing loss, is due to problems with the inner ear or with the nerve connecting the inner ear to the brain.  Sensorineural hearing loss may not be correctable, and is often permanent.  It worsens with age, and is common in the elderly.  However, sensorineural hearing loss can be associated with birth trauma, neurologic disease, trauma to the head, as well as certain medications and toxins.  Sensorineural hearing loss is treated with hearing aids.  If sensorineural hearing loss is profound and present in both ears, then cochlear implantation can be offered.

WHO GETS HEARING LOSS AND WHY?Hearing Loss in Neonates and Children - Central Valley California

In very young children (neonates), hearing loss is usually sensorineural.  It may be due to congenital reasons, meaning familial or genetic predisposition, or from events occurring during or after birth.  These include hyperbilirubinemia (severe jaundice of newborn), low oxygen levels during the birthing process, high fever, meningitis, or trauma to the head.  In addition, very low birth weight and prematurity have been associated with sensorineural hearing loss. 

Hearing loss that occurs in slightly older children is usually conductive.  This usually begins after the first ear infection as fluid builds up behind the eardrum and is not evacuated through the eustachian tube, or the tube from the middle ear to the throat.  The presence of fluid in the ear is termed “chronic otitis media with effusion” (COME).  COME is the most common cause of hearing loss in children.  The treatment for COME is myringotomy and tubes.  This is a simple outpatient procedure, where the drum is lanced, the fluid is drained, and a small tube is placed in the ear, which stays in the drum from six to eighteen months.

As we age, the effects of familial predisposition and our very loud environment begin to have an effect on the ears, and therefore high-frequency, sensorineural hearing loss begins to be seen.  Patients whose occupations require exposure to loud noises will experience this form of hearing loss earlier in their lives.  Therefore, factory workers, military personnel, patients who listen to extremely loud music, etc., will begin to have high-frequency, sensorineural hearing loss.  This can be progressive even if the loud noise is eliminated.

HEARING AIDS

Hearing Aids Fresno Visalia CaliforniaIf sensorineural hearing loss is present, then hearing aids will be advocated.  It is important to understand that hearing aids do not “give you your hearing back”.  They merely amplify external sounds to help boost the hearing that still remains.  Patients may be disappointed when they get hearing aids, expecting their previous hearing function to return.  This is an unrealistic expectation.  Candidates who are most happy with their hearing aids have come to the following conclusions:

  • they are missing out on significant information due to poor hearing
  • they have been “bothered” by family members who are frustrated with their inability to hear
  • they have been told that the radio, TV, etc., are profoundly loud
  • they often are reminded that they say “what?” a lot 

If the above four circumstances apply to you, then hearing aids may be indicated. 

If sensorineural hearing loss has been found and is present in one ear only, then further evaluation may be required to determine if there is a problem with the affected ear.  This may include nerve conduction studies or even a head MRI (Magnetic Resonance Imaging, or brain scan).  However, if sensorineural hearing loss is present in both ears, then MRI is not required.  Under both circumstances, a repeat audiogram in six to twelve months is always advocated to rule out progressive hearing loss.  If sensorineural hearing loss is present and significant, then a hearing aid evaluation is made. 

SURGERY

If conductive hearing loss is found, then the cause is sought.  In children, this most likely will be due to fluid behind the ear drum (COME).  If the ear examination and tympanogram confirm this fluid, then myringotomy and tubes will be performed.  If the tympanogram is normal and a conductive loss is present, then a CT scan is often performed.  Under these circumstances, potential problems with the middle ear bones must be investigated, and surgery or hearing aids may be advocated.

WHAT IF I HAVE AN ABRUPT CHANGE IN HEARING?

Abrupt changes in hearing are considered medical emergencies.  Therefore, if hearing suddenly changes, you should be seen within twenty-four hours in the ENT clinic.  This is in contrast to slowly progressive hearing loss, which is not a medical emergency.  If acute or sudden hearing loss does occur, this will be confirmed by a hearing test.  You will be placed on steroids and possibly an MRI will be performed.  If steroids are not begun rapidly, then the likelihood is that your newly experienced hearing loss will be permanent.

Insight into Noise, Ears & Hearing Protection

One in 10 Americans has a hearing loss that affects his or her ability to understand normal speech. Excessive noise exposure is the most common cause of hearing loss.

Can Noise Really Hurt My Ears?

Yes, noise can be dangerous. If it is loud enough and lasts long enough, it can damage your hearing.
The damage caused by noise, called sensorineural hearing loss or nerve deafness, can be caused by several factors other than noise, but noise-induced hearing loss is different in one important way––it can be reduced or prevented altogether.

Can I “Toughen Up” My Ears?

No. If you think you have grown used to a loud noise, it probably has damaged your ears, and there is no treatment––no medicine, no surgery, not even a hearing aid––that completely restores your hearing once it is damaged by noise.

How Does the Ear Work?

The ear has three main parts: the outer, middle, and inner ear. The outer ear (the part you can see) opens into the ear canal. The eardrum separates the ear canal from the middle ear. Small bones in the middle ear help transfer sound to the inner ear. The inner ear contains the auditory (hearing) nerve, which leads to the brain.

Any source of sound sends vibrations or sound waves into the air. These funnel through the ear opening, down the ear canal, and strike your eardrum, causing it to vibrate. The vibrations are passed to the small bones of the middle ear, which transmit them to the hearing nerve in the inner ear. Here, the vibrations become nerve impulses and go directly to the brain, which interprets the impulses as sound: music, a slamming door, a voice, etc.

When noise is too loud, it begins to kill the nerve endings in the inner ear. As the exposure time to loud noise increases, more and more nerve endings are destroyed. As the number of nerve endings decreases, so does your hearing. There is no way to restore life to dead nerve endings; the damage is permanent.

How Can I Tell If a Noise Is Dangerous?

People differ in their sensitivity to noise. As a general rule, noise may damage your hearing if you have to shout over background noise to make yourself heard, the noise hurts your ears, it makes your ears ring, or you have difficulty hearing for several hours after exposure to the noise.

Sound can be measured scientifically in two ways. Intensity, or loudness of sound, is measured in decibels. Pitch is measured in frequency of sound vibrations per second. A low pitch, such as a deep voice or a tuba, makes fewer vibrations per second than a high voice or violin.

What Does Frequency of Sound Vibration Have to Do with Hearing Loss?

Frequency is measured in cycles per second, or Hertz (Hz). The higher the pitch of the sound, the higher the frequency.  Young children, who generally have the best hearing, can often distinguish sounds from about 20 Hz, such as the lowest note on a large pipe organ, to 20,000 Hz, such as the high shrill of a dog whistle that many people are unable to hear.  Human speech, which ranges from 300 to 4,000 Hz, sounds louder to most people than noises at very high or very low frequencies. When hearing impairment begins, the high frequencies are usually lost first, which is why people with hearing loss often have difficulty hearing the high pitched voices of women and children. Loss of high frequency hearing also can distort sound, so that speech is difficult to understand even though it can be heard. People with hearing loss often have difficulty detecting differences between certain words that sound alike, especially words that contain S, F, SH, CH, H, or soft C sounds, because the sound of these consonants is in a much higher frequency range than vowels and other consonants.

What about Decibels?

Intensity of sound is measured in decibels (dB). The scale runs from the faintest sound the human ear can detect, which is labeled 0 dB, to over 180 dB, the noise at a rocket pad during launch.  Decibels are measured logarithmically. This means that as decibel intensity increases by units of 10, each increase is 10 times the lower figure. Thus, 20 decibels is 10 times the intensity of 10 decibels, and 30 decibels is 100 times as intense as 10 decibels.

How High Can the Decibels Go without Affecting My Hearing?

Many experts agree that continual exposure to more than 85 decibels is dangerous.

Does the Length of Time I Hear a Noise Have Anything to Do with the Danger to My Hearing?

It certainly does. The longer you are exposed to a loud noise, the more damaging it may be. Also, the closer you are to the source of intense noise, the more damaging it is.  Every gunshot produces a noise that could damage the ears of anyone in close hearing range. Large bore guns and artillery are the worst because they are the loudest. But even cap guns and firecrackers can damage your hearing if the explosion is close to your ear. Anyone who uses firearms without some form of ear protection risks hearing loss.

Recent studies show an alarming increase in hearing loss in youngsters. Evidence suggests that loud rock music along with increased use of portable radios with earphones may be responsible for this phenomenon.

Can Noise Affect More Than My Hearing?

A ringing in the ears, called tinnitus, commonly occurs after noise exposure, and it often becomes permanent. Some people react to loud noise with anxiety and irritability, an increase in pulse rate and blood pressure, or an increase in stomach acid. Very loud noise can reduce efficiency in performing difficult tasks by diverting attention from the job.

Who Should Wear Hearing Projectors?

If you must work in an excessively noisy environment, you should wear protectors. You should also wear them when using power tools, noisy yard equipment, or firearms, or riding a motorcycle or snowmobile.

What Are the Laws for on-the-Job Exposure?

Noise, Ears & Hearing Protection

Habitual exposure to noise above 85 dB will cause a gradual hearing loss in a significant number of individuals, and louder noises will accelerate this damage. For unprotected ears, the allowed exposure time decreases by one-half for each 5 dB increase in the average noise level. For instance, exposure is limited to 8 hours at 90 dB, 4 hours at 95 dB, and 2 hours at 100 dB.  The highest permissible noise exposure for the unprotected ear is 115 dB for 15 minutes/day. Any noise above 140 dB is not permitted.

The Occupational Safety and Health Administration, in its Hearing Conservation Amendment of 1983, requires hearing conservation programs in noisy work places. This includes a yearly hearing test for the approximately five million workers exposed to an average of 85 dB or more of noise during an 8-hour work day.  Ideally, noisy machinery and work places should be engineered to be more quiet or the worker’s time in the noise should be reduced; however, the cost of these actions is often prohibitive. As an alternative, individual hearing protectors are required when noise averages more than 90 dB during an 8-hour day.

When noise measurements indicate that hearing protectors are needed, the employer must offer at least one type of earplug and one type of earmuff without cost to employees. If the yearly hearing tests reveal hearing loss of 10 dB or more in higher pitches in either ear, the worker must be informed and must wear hearing protectors when noise averages more than 85 dB for an 8-hour day.  Larger losses of hearing and/or the possibility of ear disease should result in referral to an ear, nose and throat physician (otolaryngologist).

Approx.
Decibel Level Example

0 Faintest sound heard by human ear.
30 Whisper, quiet library.
60 Normal conversation, sewing machine, typewriter.
90 Lawnmower, shop tools, truck traffic; 8 hours per day is the maximum exposure to protect 90% of people.
100 Chainsaw, pneumatic drill, snowmobile; 2 hours per day is the maximum exposure without protection.
115 Sandblasting, loud rock concert, auto horn; 15 minutes per day is the maximum exposure without protection.
140 Gun muzzle blast, jet engine; noise causes pain and even brief exposure injures unprotected ears. Maximum allowed noise with hearing protectors.

What Are Hearing Protectors?
How Effective Are They?

Hearing protection devices decrease the intensity of sound that reaches the eardrum. They come in two forms: earplugs and earmuffs.

Earplugs are small inserts that fit into the outer ear canal. They must be snugly sealed so the entire circumference of the ear canal is blocked. An improperly fitted, dirty or worn-out plug may not seal and can irritate the ear canal. They are available in a variety of shapes and sizes to fit individual ear canals and can be custom made. For people who have trouble keeping them in their ears, they can be fitted to a headband.

Earmuffs fit over the entire outer ear to form an air seal so the entire circumference of the ear canal is blocked, and they are held in place by an adjustable band. Earmuffs will not seal around eyeglasses or long hair, and the adjustable headband tension must be sufficient to hold earmuffs firmly around the ear.

Properly fitted earplugs or muffs reduce noise 15 to 30 dB. The better earplugs and muffs are approximately equal in sound reductions, although earplugs are better for low frequency noise and earmuffs for high frequency noise.  Simultaneous use of earplugs and muffs usually adds
10 to 15dB more protection than either used alone. Combined use should be considered when noise exceeds 105 dB.

Why Can’t I just Stuff My Ears with Cotton?

Ordinary cotton balls or tissue paper wads stuffed into the ear canals are very poor protectors; they reduce noise only by approximately 7 dB.

What Are the Common Problems of Hearing Protectors?

Studies have shown that one-half of the workers wearing hearing protectors receive one-half or less of the noise reduction potential of their protectors because these devices are not worn continuously while in noise or because they do not fit properly.  A hearing protector that gives an average of 30 dB of noise reduction if worn continuously during an 8-hour work day becomes equivalent to only 9 dB of protection if taken off for one hour in the noise. This is because decibels are measured on a logarithmic scale, and there is a 10-fold increase in noise energy for each 10 dB increase.  During the hour with unprotected ears, the worker is exposed to 1,000 times more sound energy than if earplugs or muffs had been worn.

In addition, noise exposure is cumulative. So the noise at home or at play must be counted in the total exposure during any one day. A maximum allowable while on-the-job followed by exposure to a noisy lawnmower or loud music will definitely exceed the safe daily limit.  Even if earplugs and/or muffs are worn continuously while in noise, they do little good if there is an incomplete air seal between the hearing protector and the skin.  When using hearing protectors, you will hear your own voice as louder and deeper. This is a useful sign that the hearing protectors are properly positioned.

Can I Hear Other People and Machine Problems If I Wear Hearing Protectors?

Just as sunglasses help vision in very bright light, so do hearing protectors enhance speech understanding in very noisy places. Even in a quiet setting, a normal-hearing person wearing hearing protectors should be able to understand a regular conversation.  Hearing protectors do slightly reduce the ability of those with damaged hearing or poor comprehension of language to understand normal conversation. However, it is essential that persons with impaired hearing wear earplugs or muffs to prevent further inner ear damage.  It has been argued that hearing protectors might REDUCE a worker’s ability to hear the noises that signify an improperly functioning machine. However, most workers readily adjust to the quieter sounds and can still detect such problems.

What If My Hearing Is Already Damaged? How Can I Tell?

Hearing loss usually develops over a period of several years. Since it is painless and gradual, you might not notice it. What you might notice is a ringing or other sound in your ear (called tinnitus), which could be the result of long-term exposure to noise that has damaged the hearing nerve. Or, you may have trouble understanding what people say; they may seem to be mumbling, especially when you are in a noisy place such as in a crowd or at a party. This could be the beginning of high-frequency hearing loss; a hearing test will detect it.

If you have any of these symptoms, you may have nothing more serious than impacted wax or an ear infection, which might be simply corrected. However, it might be hearing loss from noise. In any case, take no chances with noise—the hearing loss it causes is permanent. If you suspect a hearing loss, consult a physician with special training in ear care and hearing disorders (called an otolaryngologist or otologist). This doctor can diagnose your hearing problem and recommend the best way to manage it.  To locate an otolaryngologist in your area, please visit our Find an Otolaryngologist search engine.
© 2001 AAO-HNS, Inc.

Reprinted with permission of the American Academy of Otolaryngology-Head and Neck Surgery Foundation, copyright © 2006. All rights reserved.

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