ABSTRACT
Introduction Literature data are not conclusive as to the influence of neonatal complications in the maturational process of the auditory system observed by auditory brainstem response (ABR) in infants at term and preterm. Objectives Check the real influence of the neonatal complications in infants by the sequential auditory evaluation. Methods Historical cohort study in a tertiary referral center. A total of 114 neonates met inclusion criteria: treatment at the Universal Neonatal Hearing Screening Program of the local hospital; at least one risk indicator for hearing loss; presence in both evaluations (the first one after hospital discharge from the neonatal unit and the second one at 6 months old); all latencies in ABR and transient otoacoustic emissions present in both ears. Results The complications that most influenced the ABR findings were Apgar scores less than 6 at 5 minutes, gestational age, intensive care unit stay, peri-intraventricular hemorrhage, and mechanical ventilation. Conclusion Sequential auditory evaluation is necessary in premature and term newborns with risk indicators for hearing loss to correctly identify injuries in the auditory pathway. .
Subject(s)
Animals , Humans , Mice , Carcinoma in Situ/metabolism , Carcinoma, Pancreatic Ductal/metabolism , Carrier Proteins/metabolism , Microfilament Proteins/metabolism , Pancreatic Neoplasms/metabolism , Transcription Factors/metabolism , Cell Line, Tumor , Carcinoma in Situ/genetics , Carcinoma in Situ/pathology , Carcinoma, Pancreatic Ductal/genetics , Carcinoma, Pancreatic Ductal/mortality , Carcinoma, Pancreatic Ductal/secondary , Carrier Proteins/genetics , Disease Models, Animal , Disease Progression , Epithelial-Mesenchymal Transition , Mice, Knockout , Microfilament Proteins/deficiency , Microfilament Proteins/genetics , Neoplasm Invasiveness , Neoplasm Recurrence, Local , Neoplasm Staging , Prognosis , Pancreatic Neoplasms/genetics , Pancreatic Neoplasms/mortality , Pancreatic Neoplasms/pathology , Pseudopodia/metabolism , RNA Interference , Survival Analysis , Time Factors , Transfection , Transcription Factors/geneticsABSTRACT
Introduction The first locus for nonsyndromic autosomal recessive hearing loss is on chromosome 13q11-22. The 35delGmutation is present in 80% of cases in which GJB2 is involved, which makes the study of this mutation very important. The viability and benefits of screening for mutations in the connexin 26 gene are now beginning to change the diagnostic evaluation and identification of the etiology of hearing loss. Objective To investigate the occurrence of the 35delG mutation in patients with nonsyndromic sensorineural hearing loss and their first degree relatives. Methods This transversal study included 72 patients from the local hospital. The patients were divided into three groups: group A, sensorineural hearing loss (n = 58); group B, first-degree relatives of group A with sensorineural hearing loss (n = 09); and group C, first-degree relatives of patients from group A without hearing loss (n = 05). All patients had audiological evaluation and genetic testing of the 35delG mutation. Results The 35delG mutation was found in four heterozygous mutations (three of them found in the same family). The other heterozygous mutation was found in a female patient with bilateral, moderate, prelingual, sensorineural hearing loss. A single homozygous mutation was found in a male patient, with severe sensorineural hearing loss in his right ear and profound hearing loss in the left ear. Conclusions The 35delG mutation was found in 7% of the cases. The test is easy to perform and inexpensive, but it is necessary to investigate other genes related to hearing loss. .