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| Hearing Functionality Assesment of Cochlear Hypoplasias (pp. 197-202) |
$100.00 |
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Authors: (J. Garcia-Valdecasas, E. Fernandez, M. Sainz, Otolaryngology Department, Hospital Univ. San Cecilio, Granada, Spain)
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Abstract:
Cochlear malformations represent arrested cochlear development at particular stages of the embryological development, and are caused by genetic alterations, infections, exposure to ototoxic substances and radiation, among other factors. The developmental arrest is then manifested after the individual is born and forms the basis of the current classifications. Inner ear aplasyas, common cavities, cochlear aplasyas, cochlear hypoplasias and incomplete partitions are the five principal groups of cochlear malformations.
The hearing loss is linked to the degree of the malformation. Jackler‘s first results have been reconsidered by auditory brainstem responses and electrical hearing thresoholds which can be performed delivering the stimuli directly in the promontory or even, after the cochlear implantation, inside the cochlea. Hearing skills asses the hearing functionality.
All cochlear malformations, and especially cochlear hypoplasia, may conduct wide degrees of hearing losses and so the hearing treatments vary between patients. Initially, and following the cochlear implant protocols, the hearing aid adaptation should be the first treatment option, being the hearing assessment reconsidered for at least 6 months. Those patients suffering profound hearing losses and fewer benefits from hearing aids should conduct a cochear implant protocol. Nowadays, cochlear hypoplasias are not considered as a contraindication for cochlear implantation although some surgical risks should be taken in account. During surgery, the awareness of cerebrospinal fluid leakage and aberrant facial nerves are crucial and so facial nerve monitoring and wide-spectrum antibiotics therapy should be considered. Also, the implantation of compressed or shorter electrode guides are mandatory in order to properly insert a minimum number of electrodes in the shorter timpanic scale and to avoid the inner ear canal damage. |
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