Atresia auditiva. Algunos bebés nacen sin el conducto auditivo externo o con una malformación del mismo, lo que provoca que padezcan problemas auditivos . ATRANSFERRINEMIA, 95 Atresia biliar, Atresia, bronchial, Atresia Atresia del canalículo lacrimal, Atresia del conducto auditivo externo. Se define como la malformación congénita del oído externo caracterizada por un Atresia. Conducto auditivo. Malformación congénita. Disfunción auditiva.

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Modulo 7 – Fenotipos auriculares y del conducto externo | Flashcards

According to the judgment of the physician, disorders need to be ruled out at the vertebral, renal and ophthalmological level as well as to carry out hearing tests. Exxterno, the presence of a large number of zuditivo in some genetic regions also can give rise to microtia, as observed in trisomy 13 and 18, but also by the presence of CNV consisting of five copies of a kb amplicon located on the short arm of chromosome 4.

Am J Med Genet A. However, the BAPX1 gene could cause malformations due to changes in its epigenetic regulation. Microtia has been part of the clinical picture in the most common aneuploidies such atresla trisomy 13 and A CNV could be simple in its structure such as tandem duplication or could imply complex gains or losses of homologous sequences found in multiple sites in the genome.

When it is syndromic, generally it is part of a specific pattern of multiple congenital malformations and the complete entity can be associated extegno the following factors: Previous article Next article. Small ear that retains all of its anatomic components, but the length is 2 standard deviations SD below the mean.

The tympanic membrane was normal, without perforation. Attention to this step because the flap will undergo some shrinkage. The audiometry showed a mixed hearing loss on the left ear SRT: Although there is a growing interest in relation to this disease, there are still important issues to be elucidated in relation to the genetic, genomic, and proteomic aspects in this malformation of high prevalence in our country.


Surgery involves excision of all the fibrous tissue of the EAC and the involved skin followed by canaloplasty and reconstruction with partial skin graft. Although frequently isolated in which case the abnormality is less severe and isolated to the EAC a number of syndromes are associated with external auditory canal atresia MR and CT of squamous cell carcinoma of the middle ear and mastoid complex.

Microtia is associated with unbalanced genomes.

There is also evidence that exposure to certain medications such as mycophenolate retinoids and thalidomide cause microtia. Therefore, it is important to consider the genetic aspects where the specific genes identified as the responsible individual of some types of microtia-atresia are studied and the genomic aspects where the genome is studied in its entirety to establish the possible causes of microtia-atresia.

This alteration involves the derivatives of the first and second branchial arches and presents craniofacial, cardiac, vertebral and central nervous system CNS disorders. Different signaling molecules and proteins are involved in the morphogenetic process and in the differentiation of the outer ear. Todos los pacientes presentaban como antecedente una ds recurrente. Curr Top Dev Biol. Humana Press Inc; Due to the relevance that the frequency of microtia atresia has in different health services in Mexico, it is important that all medical professionals are aware of its clinical, molecular and inherited characteristics.

The ossicles often need to be mobilized. HRCT evaluation of microtia: There is also evidence that exposure to certain medications such as mycophenolate retinoids and thalidomide cause microtia.

Soft tissue filling in the mastoid cells, antrum, tympanic cavity and EAC.

Clinical implications for the paediatrician?? Findings in the middle ear are variable. Mexico has a prevalence of microtia of 7. Case report and review of the literature.


InHermann Marx published the first classification system for congenital anomalies of the external ear, which is one of the most used currently. Clinical classification InHermann Marx published the first ayditivo system for congenital anomalies of the external ear, which is one of the most used currently.

Genes involved in the development of microtia. Microtia is defined as a congenital malformation of the exherno ear characterized by a small auricular lobe with an abnormal shape.

A large number of syndromes demonstrate microtia, 23,53 which calls attention that many genes intervene in the development of the external ear. Incisions are performed in the skin with a blade to increase the area and to avoid flap retraction.

This malformation encompasses a wide spectrum of clinical abnormalities of the ear, which differ with regard to its severity, from minor anomalies to the complete absence of the ear or anotia. CNV could influence gene expression by interrupting genes or altering the gene dose.

Modulo 7 – Fenotipos auriculares y del conducto externo

The total skin flaps cknducto the advantage of suffering less traction during healing 1 ; however, they have the disadvantage of the larger volume. Introduction The medial fibrosis of the external auditory canal EAC is a rare condition in which the medial portion of the CAE is obliterated with fibrous tissue.

New technologies are required such as the aforementioned GWAS to identify genes responsible and protein products or regulators that these have during specific periods of embryonic development along with their interactions with the environment auditio the genome.