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hearing loss types

hearing loss types

Conductive hearing loss - 
Wherein sound is not conducted efficiently through the outer and middle ears due to :

  • Impacted wax in the ear canal
  • Perforation of the ear drum
  • Fluid in the middle ear
  • Discontinuity or fixation of the tiny bones or ossicles of the middle ear.

It can often be corrected through medicine, surgery, hearing aid or a middle ear implant as in a stapedectomy or ossicular replacement prostheses.

Sensorineural hearing loss - 
Is caused by

  • Damage to the inner ear (cochlea)
  • Birth injury (neonatal jaundice or hypoxia) to the nerve pathways from the inner ear to the auditory centers in brain.
  • Drugs that are toxic to the auditory system, genetic syndromes, noise exposure / viruses / hear trauma / aging and tumors.

People with sensorineural hearing loss experience a reduction in sound level, speech understanding and hearing clarity. It cannot be corrected medically or surgically and is a permanent loss, but hearing clarity can be improve by the use of hearing aids and more recently with Cochlear Implant.

Mixed hearing loss - 
Sometimes a sensorineural hearing loss occurs in combination with a conductive hearing loss were in there may be damage in the outer or the middle ear and the cochlea or auditory nerve. In these cases a combination of surgery and hearing aids can alleviate the problem.

Degree of hearing loss

  • Normal hearing ( 0 to 25 dB HL)
  • Mild hearing loss ( 26 to 40 dB HL)
  • Moderate hearing loss ( 41 to 70 dB HL)
  • Severe hearing loss ( 71 to 90 dB HL)
  • Profound hearing loss (greater than 91 dB HL)

"ABOUT 3 OUT OF EVERY 1000 NEW BORN BABIES ARE BORNED WITH SOME FORM OF HEARING IMPAIREMENT WHICH MAKES IT ONE OF THE MOST COMMON BIRTH DEFECTS IN THE WORLD."

  • 2018-03-11T13:40:27

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