Hearing impairment

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [[Mailto:charlesmichaelgibson@gmail.com|[1]]]; Associate Editor(s)-in-Chief:

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Hearing impairment may be a partial or complete decrease in the ability to perceive or comprehend sounds.^[1] Caused by a good range of biological and environmental factors, loss of hearing can happen to any organism that perceives sound. It is highly prevalent impairment and chances increase as one’s age above 60.^[2]Classification is based on laterality, severity, cause, anatomy of ear, symmetry, clinical characteristics, age of onset, and associated symptoms. Sound waves vary in amplitude and in frequency. Amplitude is that the sound wave’s peak pressure variation. Frequency is that the number of cycles per second of a sinusoidal component of a wave. Loss of the power to detect some frequencies, or to detect low-amplitude sounds, that an organism naturally detects, may be termed as a hearing disorder. Hearing sensitivity is indicated by the quietest sound that a person can detect, termed the hearing threshold. The normal hearing threshold is not the same for all frequencies of sounds. The Long term exposure to environmental noise, Genetics, Disease or illness, Medications^[3], and Physical trauma are different biological mechanisms for hearing loss. 10% of the population in the United States is affected by hearing loss. The prevalence of clinically significant hearing loss doubles with each passing decade of life. Approximately two thirds of Americans aged 70 years or older have hearing loss. Any age people are susceptible for hearing impairment it depends on exposure to risk factors. Middle-aged adults can develop hearing loss due to genetic mutations, noise exposure, and ototoxic medications. Older adults also develop multifactorial age-related hearing deafness. Infections are the most common risk for hearing loss in young adults e-g labyrinthitis, meningitis, otitis media, otitis externa. There are different recommendations for screening for hearing loss, at what age, and the various methods for screening including whisper test, hand rub, audiometer, different questionnaire and using smart-phones. Different factors contribute to prognosis of hearing loss and psychological complications associated with deafness are a big concern for physicians. Many persons may not recognize changes in their hearing and others may be embarrassed or frustrated by their perceived deficits. As constant asking for repetition of information can be embarrassing. A focused otologic history with information on the chronicity and onset of hearing loss, along with otoscopy can help is early recognition and treatment. Physical exam along with history aid in the definitive diagnosis of hearing loss. Routine laboratory evaluation is insignificant unless a systemic illness is identified as a cause of hearing loss. Imaging studies could also be used to differentiate conductive hearing loss and, in some cases sensorineural hearing loss (asymmetric hearing loss) for diagnostic and treatment management, including surgical planning. Within 14 days of symptom onset in patients with sudden hearing loss, clinicians should obtain, or refer to a clinician who can obtain, audiometry as soon as possible to confirm the diagnosis of sudden sensorineural hearing loss. Another method for determining deafness is that the Hearing in Noise Test (HINT). Genetic testing could also be considered to be a strong tool for addressing hearing disorders in children. Medical therapy includes removal of impacted cerumen via irrigation, manually, cerumenolytics, and under microscopy. Sudden onset SNHL can be treated with a single dose of steroids. A surgical candidate is the patients with conductive hearing loss due to mechanical problems, such as perforation of the eardrum, ossicular disease, or a cholesteatoma in the middle ear. Hearing Aids and cochlear implantation technology and surgical techniques have advanced significantly. Hearing impairment can be prevented by preventing exposure to common risk factors, loud noise, ototoxic drugs, and trauma. There are no established measures for the secondary prevention of hearing loss. The use of hearing aids and cochlear implants is an expensive intervention for the patients experiencing hearing loss and it is one other major limiting factor for undergoing treatment if patient’s insurance does not cover the cost. Age-related hearing loss has been independently associated with worse quality of life, depression, social isolation, functional decline, increase falls, increased hospitalization and health care use, and accelerated cognitive decline, and increase risk of dementia. Hearing aids or cochlear implants may improve communication, social and emotional function, and cognitive function. Use of somatic cell within the prospect of regrowth in cochlea cells is under study. The tablet-based automated audiometer presents a new method for threshold hearing assessment. Similarly video conferencing, flashing lights to signal events and other telecommunications devices are under study.

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1] Associate Editor(s)-in-Chief:

Noise-induced hearing loss is a centuries-old concern and is still prevalent worldwide. Harriet Martineau’s 1834 essay, Letters to the Deaf, was the earliest chronicle portraying the social challenges of deafness.

Noise-induced hearing loss is a centuries-old concern and is still prevalent worldwide. ^[1]The ancient Egyptians and Greeks tried to elucidate hearing loss and wanted remedies, creating use not solely of empiric rational means that however conjointly magic and faith. Later, within the Middle Ages, examples from Christian ikon ar found demonstrating the miracle healing of hearing loss. Education of the deaf wasn’t thought of doable from the time of Aristotle to the sixteenth century, however from then on was organized on an oversized scale utilizing speech with gestures.^[2]

Harriet Martineau was a 19th-century social scientist United Nations agency had a progressive style of hearing loss. Her 1834 essay, Letters to the Deaf, was the earliest chronicle portraying the social challenges of deafness. Martineau details advanced things that deaf individuals experienced within the nineteenth century like social isolation because of frustrations with communication, doc shortcomings, restricted music appreciation, and also the stigma of hearing amplification devices. Her descriptions of those experiences are faced by deaf individuals in current society. Advancements in technology and recognition of the negative social impact of deafness have improved the social expertise for the laborious of hearing; but, social challenges stay relevant. During this article, we tend to review Letters to the Deaf and note the ways in which within which this essay provides a twin perspective relating to the abundance we’ve advanced as a society and the way much we tend to still ought to overcome in addressing the social challenges of deafness.^[3]

The hearing aid was unreal within the seventeenth century. The ear trumpet was invented in the seventeenth century and is considered the first device used to help the deaf. The hearing aid (electrical) was first invented in 1898 by Miller Reese Hutchison.

Up till the sixteenth century, it had been unremarkably accepted that people with hearing disorders additionally suffered from multiple different disabilities; this diode to them being heavily discriminated against. it had been not till a Spanish monk named Pedro offender educated a nobleman’s deaf sons a way to scan, write, speak and do the mathematics that this reality was disproven.

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1] Associate Editor(s)-in-Chief:

Classification is based on laterality, severity, cause, anatomy of ear, symmetry, clinical characteristics, age of onset, and associated symptoms.

Hearing losses can be classified according to:^[1]

1. Laterality
2. Symmetry
3. Clinical characteristic (syndromic or not)
4. Time of onset (congenital, perinatal, or postnatal)
5. Hereditary (genetic or not)
6. Time of manifestation (prelingual, perilingual, or post-lingual)
7. Intensity (mild, moderate, severe, and profound)

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1] Associate Editor(s)-in-Chief:

Sound waves vary in amplitude and frequency. Amplitude is that the sound wave’s peak pressure variation. Frequency is that the number of cycles per second of a sinusoidal component of a wave. Loss of the power to detect some frequencies, or to detect low-amplitude sounds, that an organism naturally detects, may be termed as a hearing disorder. Hearing sensitivity is indicated by the quietest sound that a person can detect, termed the hearing threshold. The normal hearing threshold is not the same for all frequencies of sounds. Long-term exposure to environmental noise, Genetics, Disease or illness, Medications^[1], and Physical trauma are different biological mechanisms for hearing loss.

• Sound waves vary in amplitude and frequency. Amplitude is that the sound wave’s peak pressure variation. Frequency is that the number of cycles per second of a sinusoidal component of a wave. Loss of the power to detect some frequencies, or to detect low-amplitude sounds, that an organism naturally detects, may be termed as a hearing disorder.^[2]

• Hearing sensitivity is indicated by the quietest sound that a person can detect, termed the hearing threshold. This threshold is often accurately measured by a behavioral audiogram, in humans and a few animals. A record is formed of the quietest sound that consistently prompts a response from the listener. The test is administered for sounds of various frequencies. There also are some electrophysiological tests that will be performed without requiring a behavioral response of the individual.

• The normal hearing threshold is not the same for all frequencies of sounds. If different frequencies of sound are played at an equivalent amplitude, some are going to be loud, quiet, or completely inaudible. Generally, if the amplitude is increased, a sound is more likely to be heard. Ordinarily, when animals use sound to speak, hearing therein sort of animal is most sensitive for the frequencies produced by calls, or, within the case of humans, speech. This tuning of hearing exists at many levels of the sensory system, all the way from the physical characteristics of the ear, to the nerves, and tracts that convey the auditory impulses to the portion of the brain that is sensitive to hearing sounds.^[4]

• A hearing disorder exists when a person isn’t sensitive to the sounds normally heard by its kind. The term hearing impairment is usually reserved for folks that have relative insensitivity to sound within the speech frequencies. The severity of hearing impairment is defined as; how much louder a sound must be made over the usual levels before the listener can perceive it. In profound deafness, even the loudest sounds which will be produced by the instrument wont to measure hearing like an audiometer, might not be detected.

• There is a rare sort of hearing impairment that affects speech discrimination alone. There is another aspect to hearing that involves the quality of a sound instead of amplitude and frequency. This quality of sound is typically measured by tests of speech discrimination. These tests require that the sound isn’t only detected but understood.

• Populations of individuals living near airports or freeways are exposed to levels of noise typically > 65 dB. If the lifestyle of a person includes significant outdoor activities, these exposures over time can degrade hearing. Various states have set noise standards to guard people against these adverse sound risks.

• The EPA has identified the extent of 70 DB for twenty-four-hour exposure because of the level necessary to guard the general public against deafness (EPA, 1974).

• Noise-Induced deafness (NIHL) typically is centered at 4000 Hz.

• The louder the noise is, the shorter is the safe amount of exposure. Normally, the safe amount of exposure is reduced by an element 2 for each additional 3 dB. for instance, the safe daily exposure amount at 85 dB is 8 hours, while the safe exposure at 91 dB is merely 2 hours. Sometimes, an element 2 per 5 dB is employed.

• Personal electronic audio devices, like iPods, can produce powerful enough sound to cause significant Noise-Induced deafness, iPods often reaching 115 decibels or higher, as long as lesser intensities of even 70 dB also can cause deafness.

• Hearing loss is often inherited. Both dominant and recessive genes exist which may cause mild to profound impairment. If a family features a gene for deafness it’ll persist across generations because it’ll happen within the offspring albeit it’s inherited from just one parent. If a family had a genetic hearing disorder caused by a gene it’ll not always be apparent because it will need to be passed onto offspring from both parents Dominant and recessive hearing disorders are often syndromic or non-syndromic. Recent gene mapping has identified dozens of non-syndromic dominant and recessive sorts of deafness.

• The most common sort of congenital hearing disorder in developed countries is non-syndromic recessive, also referred to as Connexin 26 deafness.

• The most common dominant syndromic sorts of hearing disorder include Stickler syndrome and Waardenburg syndrome.

• The most common recessive syndromic sorts of the hearing disorder are Pendred syndrome, Large vestibular aqueduct syndrome, and Usher syndrome

• Measles can result in auditory nerve damage.

• Meningitis can damage the acoustic nerve or the cochlea of the inner ear.

• Autoimmune disease has only recently been recognized as a possible cause of cochlear damage. Although probably rare, autoimmune processes can focus on the cochlea specifically, without symptoms affecting other organs. Wegener’s granulomatosis is one of the autoimmune conditions which will precipitate deafness.

• Mumps (Epidemic parotitis) may end in profound sensorineural deafness (90 dB or more), unilateral or bilateral.

• Presbycusis is deaf thanks to the loss of perception to high tones, mainly within the elderly people. It is caused by some to be a degenerative processes within the inner ear, although there is no proven link to aging.^[10]

• Adenoids that do not disappear by adolescence may still grow and should obstruct the Eustachian tube, causing conductive hearing disorder and nasal infections which will spread to the center ear.

• AIDS patients frequently experience sensory system anomalies.

• HIV and subsequent opportunistic infections can directly affect the cochlea and central sensory system.

• Chlamydia may cause deafness in newborns to whom the disease has been passed at birth through the birth canal during normal vaginal delivery.

• Fetal alcohol syndrome is reported to cause hearing loss in up to 64% of infants born to alcoholic mothers, from the ototoxic effect on the developing fetus plus malnutrition during pregnancy from the excess alcohol intake.

• Premature birth results in sensorineural hearing loss approximately 5% of the time.

• Syphilis is usually transmitted from pregnant women to their fetuses, and a few thirds of the infected children will eventually become deaf.

• Otosclerosis may be a hardening of the stapes within the tympanic cavity in the middle ear and it causes conductive deafness.

See also Ototoxicity

• Some medications cause irreversible damage to the ear and are limited in their use for this serious side effect. The foremost important group is that aminoglycosides (gentamicin).

• Various other medications may cause reversible hearing loss. This includes some diuretics, NSAIDs, aspirin, and macrolide antibiotics.

• Extremely heavy Vicodin and OxyContin abuse are understood to cause hearing disorders.

• There is often external damage either to the ear itself or to the brain centers that process the aural information conveyed by the ears.

• People who sustain head injury are especially susceptible to deafness or tinnitus, either temporary or permanent.

• Exposure to very bang (90 dB or more, like jet engines at close range) can cause progressive deafness. Exposure to one event of extreme bang (such as explosions) also can cause deafness. A typical source of acoustic trauma may be a too-loud music concert.

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1] Associate Editor(s)-in-Chief:

Causes based on each organ system, mode of injury, anatomy of ear, and choronicity are listed below.

• Acute or chronic otitis media
• Cerumen impaction
• Cholesteatoma
• Earwax (foreign bodies)
• Eustachian tube dysfunction
• Head trauma
• Mastoiditis
• Middle ear effusion
• Otitis Externa
• Otosclerosis
• Physical straining (barotrauma)
• Rapid descent in air or water (barotrauma)

• Acoustic neuroma
• Alport’s Syndrome
• Drugs
• Hereditary sensorineural hearing loss
• Meniere’s Disease
• Noise-induced
• Presbycusis

• Berger’s Disease
• Cytomegalovirus (CMV)
• Diabetes Mellitus
• Epstein-Barr Virus (EBV)
• Fat emboli
• Herpes simplex
• Herpes zoster
• Hypercoagulable states
• Hyperlipoproteinemia
• Infarction
• Influenza
• Leukemia
• Lyme Disease
• Macroglobulinemia
• Measles
• Meningitis
• Metastases
• Mumps
• Ototoxic drugs, toxins
• Polycythemia vera
• Prolonged QT syndrome variant
• Sickle Cell Anemia
• Tertiary Syphilis
• Wardenberg’s Syndrome

• Autoimmune disease
• Congenital deafness
• Hereditary conditions
• Hypothyroidism
• Multiple Sclerosis
• Pregnancy
• Presbycusis
• Trauma

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [[Mailto:charlesmichaelgibson@gmail.com|[1]]]; Associate Editor(s)-in-Chief:

10% of the population in the United States is affected by hearing loss. The prevalence of clinically significant hearing loss doubles with each passing decade of life. Approximately two-thirds of Americans aged 70 years or older have hearing loss.

• 10% of the population in the United States is affected by hearing loss.
• 1 in 1000 is deaf worldwide, So the global deaf population is approximately to be 0.1% of the total population.^[1]
• The figure is likely to be higher in developing countries than developed countries due to restricted access to health care, and, in some cultures, due to the high rate of intrafamilial marriages. The great majority of people with less than average hearing are elderly or developed hearing loss after leaving school.^[2]
• According to the U.S. National Center for Health statistics, approximately three-quarters of deaf and hard-of-hearing Americans experienced the onset of hearing loss after age 18.^[2]
• In the United States, sudden onset sensorineural hearing loss affects almost 5 to 27 per 1 hundred thousand people annually, with about 66,000 new cases per year.^[3]
• The prevalence of clinically significant hearing loss doubles with each passing decade of life.^[4]
• Approximately two-thirds of Americans aged 70 years or older have hearing loss, but only 15%–20% of U.S. older adults use hearing aids.^[5]

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1] Associate Editor(s)-in-Chief:

Hearing loss can occur in any age group. Any age people are susceptible for hearing impairment it depends on exposure to risk factors. Middle-aged adults can develop hearing loss due to genetic mutations, noise exposure, and ototoxic medications. Older adults also develop multifactorial age-related hearing deafness. Infections are the most common risk for hearing loss in young adults e-g labyrinthitis, meningitis, otitis media, otitis externa.^[1]

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1] Associate Editor(s)-in-Chief:

The different recommendations for screening for hearing loss, at what age, and also describes the various methods for screening including whisper, hand rub, audiometer, different questionnaire and using smartphones.

Who should be screened

There are different recommendations for who should be screened for deafness, at what different age and presence of risk factors:^[1]

• The general rule is; screening should be carried for at-risk adults, little benefit exists on universal screening of adults or suggested interval screening in any group without being in danger for the hearing disorder. ^[2]

• There is insufficient evidence to screening among asymptomatic adults aged 50 years or older by U.S. Preventive Services Task Force ^[3]

• Medicare mandates screening as a part of the annual wellness examination for adults older than 65 years.

• Screen all adults once every decade until age 50 years and each 3 years afterward by the American Speech-Language-Hearing Association.

How to screen? ^[4]

• Studies showed that screening with simple tests on a clinic visit, like the whisper test, audio-scope, an otoscope, and audiometer, or a self-assessment questionnaire, results in easy screening with successful therapeutic or compensatory treatment.

• Single question: Do you believe you have hearing loss? (yes/no). Self-reported hearing difficulty changes by the degree of hearing loss ( mild/moderate, severe/profound) and sociodemographic characteristics and is typically difficult to select during a person with a light degree of deafness ^[7][8] There are multiple questionnaire assessment tests for instance Hearing Handicap Inventory for the Elderly Screening Version. It has a 10-item questionnaire with three options of “absent,” “present” and “sometimes,”

• The Weber and Rinne tests should not be used for general screening as they have little sensitivity for the detection of hearing loss. Elderly adults who know they have hearing impairment require audiometry for confirmation, while those who don’t know about their hearing should be screened with the whispered-voice test as described in the table. Elderly adults who perceive the whispered voice require no further testing, while those unable to perceive the voice require audiometry for screening.^[9][10]
• The advancement of science has led to the development of mobile technology-based screening options, such as the use of different mobile phone apps (for example, uHear, Mimi) and smartphone or tablet-based portable audiometers that can be connected to conduct screening for hearing impairment. They generally require supra-aural headphones for monitoring.^[11]
• After deafness is diagnosed, the Weber and Rinne test can be conducted to differentiate whether it’s a conductive, sensorineural, or mixed type hearing loss.
• All patients with hearing loss should be offered a referral to an audiologist or an otolaryngologist. Worrisome symptoms accompanying hearing loss like headache, weight loss, bleeding, etc. need urgent referral to an otolaryngologist for further investigations.

• Genetic testing may be considered to be a significant tool for diagnosing hearing impairment in children. The genetic screening test is defined as the analysis of human DNA in order to detect heritable-related mutations in children as early as possible, to prevent cognitive impairment in kids.

Different factors contribute to prognosis of hearing loss and psychological complications associated with deafness are a big concern for physicians.

65% of patients with sudden idiopathic sensorineural hearing loss recover completely within 14 days, independent of any type of medical or surgical treatment. There is a fundamental difference in the behavior of apical and basal cochlea losses recovery and hearing recovery is always better at low than at high frequencies.

Age-related hearing loss has been associated with^[1][2]

• Worse quality of life
• Depression
• Social isolation
• Functional decline
• Fall risk
• Increased hospitalization
• Increase Health care use
• Accelerated Cognitive decline
• Dementia

The prognosis for hearing recovery for idiopathic SSNHL depends on a variety of things including the severity of hearing loss, the shape of the audiogram, age of onset, presence of vertigo, and presence or absence of other risk factors.^[3][4]

Prognosis can be predicted according to the slope of the audiogram taken at the start of hearing difficulty (low-frequency losses do better than high-frequency losses), Inflammatory markers, erythrocyte sedimentation rates, hearing at 8 kHz, in some cases, it depends on speech discrimination scores and spatial disorientation symptoms.^[5]