5 A stan dard hearing aid functions by amplifying the sound conducted through th

Question

5 A stan dard hearing aid functions by amplifying the sound conducted through the external auditory canal. Explain type of hearing aid is effective for conductive hearing loss, but not sensorineural hearing loss. 6 The most common cause of hearing loss is exposure to loud noise such as music, which can permanently damage the hair cells of the cochlea. Would you expect this to result in conductive or in sensorineural hearing loss? What results would you expect from the Rinne and Weber tests in an individual with noise-induced hearing loss? aloss of smell An X-ray reveals a fracture of

Explanation / Answer

A. Hearing aids are sound-amplifying devices designed to aid people who have a hearing impairment.The hearing aid receives sound through a microphone, which converts the sound waves to electrical signals and sends them to an amplifier. The amplifier increases the power of the signals and then sends them to the ear through a speaker.

As in Conductive hearing loss there is problems with the ear canal, ear drum, or middle ear and its little bones (the malleus, incus, and stapes) include congenital absence of ear canal or failure of the ear canal to be open at birth, congenital absence, malformation, or dysfunction of the middle ear structures, all of which may possibly be surgically corrected or alternatively may be improved with amplification with a bone conduction hearing aid

Sensorineural hearing loss is sensory loss involving the inner ear and neural loss involving the hearing nerve. Also called nerve deafness.It causes sounds to become distorted. Amplifying sounds through hearing aids makes them sound louder, but not necessarily clearer. Even good quality hearing aids can sound distorted if the inner ear is severely damaged.

B.Noise-induced hearing loss (NIHL) is hearing impairment resulting from exposure to loud sound.Noise-induced hearing loss is the second most common form of sensorineural hearing deficit.Shearing forces caused by any sound have an impact on the stereocilia of the hair cells of the basilar membrane of the cochlea; when excessive, these forces can cause cell death, resulting in nerve damage leading to sensorineural hearing loss.

The Weber test is used in conjunction with the Rinne test and is most useful in patients with unilateral hearing loss. The aim is to identify the better-hearing cochlea. The 512-Hz tuning fork is struck and placed in the midline on either the forehead or the vertex. The patient is asked if the sound is heard louder in one ear or equally in both ears. In a normally hearing patient, the tone is heard centrally. Otherwise, the sound is heard on the side of the better cochlea unless there is a conductive hearing loss, in which case the tone may be heard in the poorer-hearing ear.It can detect unilateral (one-sided) conductive hearing loss (middle ear hearing loss) and unilateral sensorineural hearing loss (inner ear hearing loss).

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