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KMID : 0381219720040080478
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Journal of RIMSK
1972 Volume.4 No. 8 p.478 ~ p.483
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CAUSES OF HEARING LOSS
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Abstract
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Hearing loss is of two general types; a conductive type and a sensori-neural type. There may an element of both" types in a patient, and then the loss is called mixed.
Any impairment of the conduction of sound impulses through the external canal, the tympanic membrane, the middle ear space, and in the transmission of the stimulus through a normal movement of the stapes causes a hearing loss of the conductive type. Any interference with the perceiving of the impulse because of injury to the organ of Corti, the cochlear nerve, or the acoustic branch of the eighth cranial nerve from the end-organ to its connections in the brain causes a sensori-neural type of hearing loss.
The other two types of hearing loss, usually not classified under the conduction or sensori-neural type, are simulated hearing loss and congenital hearing loss. The simulated type occurs in two forms; hysterical and psychic, and malingering. Congenital hearing loss of a profound degree is essentially of a sensorineural type and may be due to abnormal development of the cochlea or as a result of birth injury, German measles, or some toxic effect occurring prenatally.
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KEYWORD
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