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Sensorineural hearing loss (SNHL) is a type of hearing loss in which the root cause lies in the inner ear, sensory organ (cochlea and associated structures), or the vestibulocochlear nerve (cranial nerve VIII). SNHL accounts for about 90% of reported hearing loss.
Vestibular schwannoma, erroneously known as Acoustic neuromas, and other types of brain tumours can cause hearing loss by infringement of the tumour on the vestibulocochlear nerve; Viral diseases of the ear can cause sensorineural hearing loss usually as the consequence of labyrinthitis. The person may be generally unwell at the time.
A neuropathy usually refers to a disease of the peripheral nerve or nerves, but the auditory nerve itself is not always affected in auditory neuropathy spectrum disorders. [2] Prevalence in the population is relatively unknown. Neonates with high risk factors for hearing loss have a prevalence of up to 40% (Vignesh, Jaya, & Muraleedharan 2016).
Known causes include genetics, maternal illness and injury. Examples of these causes are physical trauma, acoustic neuroma, maternal prenatal illness such as measles, labyrinthitis, microtia, meningitis, Ménière's disease, Waardenburg syndrome, mumps (epidemic parotitis), mastoiditis or due to an overstrained nervus vestibulocochlearis after a brain surgery to close to the nerve.
Deafness can be broken down into four different types of hearing loss: conductive hearing loss, sensorineural hearing loss, mixed hearing loss, and auditory neuropathy spectrum disorder. All of these forms of hearing loss cause an impairment in a person's hearing where they are not able to hear sounds correctly.
Cortical deafness is most often caused by stroke, but can also result from brain injury or birth defects. [4] [5] More specifically, a common cause is bilateral embolic stroke to the area of Heschl's gyri. [6] It is thought that cortical deafness could be a part of a spectrum of an overall cortical hearing disorder. [3]
The main causes of scalp pain. There are a lot of potential culprits behind your scalp pain. These are the most common ones doctors see and diagnose. ... which is where the nerve endings in your ...
Auditory neuropathy spectrum disorder (ANSD) is a specific form of hearing loss defined by the presence of normal or near-normal otoacoustic emissions (OAEs) but the absence of normal middle ear reflexes and severely abnormal or completely absent auditory brainstem response (ABRs).
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