Cochlear deafness

Introduction Cochlear deafness can cause hearing impairment. Because the blood supply to the cochlea is relatively fragile, it is easily damaged. All lesions in the cochlea can cause cochlear deafness. Because the blood supply to the cochlea is relatively fragile, it is easily damaged.

Cause

Cochlear deafness: Because the blood supply to the cochlea is relatively fragile, it is easily damaged. All lesions in the cochlea can cause cochlear deafness. Cochlear deafness can cause hearing impairment. Because the blood supply to the cochlea is relatively fragile, it is easily damaged. All lesions in the cochlea can cause cochlear deafness. Usually, high-frequency hearing is firstly damaged, and a valley-like hearing loss occurs. The typical audiogram shows a steep drop at 4000 Hz.

an examination

Related inspection

Re-testing Otolaryngology CT examination

Cochlear deafness

Because the blood supply to the cochlea is relatively fragile, it is easily damaged. All lesions in the cochlea can cause cochlear deafness. Usually, high-frequency hearing is firstly damaged, and a valley-like hearing loss occurs. The typical audiogram shows a steep drop at 4000 Hz. The characteristics of the electrical audiometry test for cochlear hearing impairment are:

(1) Fu Cong phenomenon: The degree of hearing loss is reduced or disappeared due to the increase of the intensity of the stimulus, and the strong sound tolerance is reduced. The patient feels ear pain when the normal person's strong sound tolerance (105-110 dB) is not reached.

(2) Hearing: The sounds heard by the same tone patient are inconsistent, one high and one low.

(3) Pathological auditory adaptation: The hearing threshold is significantly increased during sustained sound stimulation.

Differential diagnosis

Differential diagnosis of cochlear deafness:

1. Neurological deafness damages the lesions of the cochlear nerve can cause neurological deafness. The clinical features are:

(1) High-frequency hearing is firstly damaged, gradually expanding to the mid-bass, and finally generally decreasing.

(2) The air conduction is larger than the bone conduction, but both are shortened.

(3) It has obvious pathological adaptation.

2. Central deafness

The lesion is located in the brainstem and brain, involving the cochlear nucleus and its central conduction pathway, and the auditory cortical center leads to central deafness.

(1) Brain-dry central deafness: involving the cochlear nucleus to produce one-sided deafness, to a lesser extent; if one side of the cochlear nucleus and the contralateral cross-fiber are involved, bilateral deafness is generated, with partial sexy deafness More common, common in pons, medullary lesions.

(2) Cortical deafness: Cortical deafness is difficult to distinguish between the sound distance and the nature. Sometimes, although the general hearing is not damaged, the aesthetic ability of the language is reduced. As one side of the cochlear nucleus fibers projects into the bilateral auditory cortex, one side of the auditory cortex is damaged or one side of the conduction pathway is damaged resulting in one or both hearing loss.

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