Cumplimiento de la normatividad vigente para la detección temprana de la hipoacusia neonatal / Compliance with current standards for the early detection of neonatal hearing loss

Objetivo Evaluar el cumplimiento del apartado de "Valoración de la Capacidad Auditiva" estipulado en la Norma Técnica para la Detección de las Alteraciones en el menor de 10 años en la ciudad de Bogotá, Colombia. Método Se realizó un estudio transversal. Se revisaron las historias clínicas de todos los niños nacidos entre el 01 de julio y el 31 de diciembre de 2010, en dos instituciones de salud de la ciudad de Bogotá. Se seleccionaron aquellas en las que se presentaba cualquiera de los siguientes factores de riesgo: hiperbilirrubinemia neonatal con requerimiento de fototerapia, exposición neonatal a ototóxicos, bajo peso al nacer (<1 500 gramos) y se verificó la remisión a Potenciales Auditivos Evocados como prueba de detección de la hipoacusia neonatal de acuerdo a lo estipulado de manera obligatoria en la Norma Técnica para la Detección de las Alteraciones de Crecimiento y Desarrollo en el Menor de Diez Años. Resultados En ninguna de las dos instituciones se realizó la remisión a la prueba mencionada. Discusión Los resultados del estudioindican graves dificultades en la adherencia al protocolo de detección temprana de la hipoacusia neonatal vigente en la normatividad Colombiana.

Objective Assessing compliance with the section "Assessment of hearing" stipulated in the Technical Standard to Detect Alteration in children aged less than 10 years-old in Bogota. Methods This was a cross-sectional study which involved reviewing the medical records of all children born between July 1st and December 31st 2010 in two healthcare institutions in Bogota. Records were selected in which any of the following risk factors appeared: neonatal hyperbilirubinaemia involving phototherapy, neonatal exposure to ototoxic substances and/or <1.500 gr low birth weight. It was also ascertained whether children had been referred to an auditory evoked potential test as the prescribed screening test for neonatal hearing, as stipulated in mandatory Colombian technical standards for detecting abnormal growth and developmental in children aged less than ten years-old. Results Neither of the two institutions was making the aforementioned referral test. Discussion The results indicated significant difficulties in adherence to the protocol for the early detection of hearing loss regarding pertinent/current neonatal Colombian regulations.

Padronização do potencial evocado auditivo de tronco encefálico utilizando um novo equipamento / Standardization of brainstem auditory evoked potential using a new device

TEMA: padronização do Potencial Evocado Auditivo de Tronco Encefálico (PEATE) utilizando um novo equipamento. OBJETIVO: padronizar as respostas do PEATE utilizando de um novo equipamento desenvolvido (NED) no Brasil. MÉTODOS: análise das latências absolutas, interpicos e das amplitudes das ondas do PEATE, por meio de um novo equipamento desenvolvido para estudar grupos de ouvintes normais (91 adultos) e outro com perda neurossensorial (15 adultos) com perda auditiva neurossensorial bilateral entre o equipamento EP15 / Interacoustis e o NED. Utilizando o clique não filtrado, com duração de 100 microssegundo (µs), totalizando 2.000 estímulos, na polaridade rarefeita, frequência de estimulação de 13,1 cliques/s, intensidade de 80 decibels de nível de audição normalizado (dB NAn), com janela de 10 milissegundos e filtro passa-banda entre 100 e 3000 Hertz (Hz). Nível de significância de 0,05. RESULTADOS: as médias das latências absolutas e interpicos em 76 ouvintes normais no NED foram: onda I=1,50, III=3,57, V=5,53, I-III=2,06, III-V=1,96 e I-V=4,02. Ao separar por gênero houve diferença estatisticamente significante para as latências absolutas das ondas III e V e nos interpicos I-III e I-V. Valor médio da amplitude da onda I=0,384 microvolt (μV) e da onda V=0,825 μV. Não existiu diferença estatisticamente significante ao comparar as latências absolutas e interpicos entre dois equipamentos no mesmo indivíduo. CONCLUSÃO: os componentes do PEATE com o NED em ouvintes normais foram similares quanto às orelhas, com latências menores estatisticamente significantes nas mulheres. As latências do PEATE no mesmo indivíduo com o NED foram semelhantes às obtidas com o EP15 / Interacoustis. Foram obtidos os valores de normalidade para o PEATE em adultos ouvintes normais.

BACKGROUND: standardization of Brainstem Auditory Evoked Potential (BAEP) using a new device. AIM: to standardize BAEP responses using a new device developed (NDD) in Brazil. METHOD: analysis of absolute latencies, interpeaks and wave amplitudes of BAEP, using a new device developed to study normal-hearing groups (91 adults) and individuals (15 adults) with bilateral neurosensory hearing loss. Responses obtained in the EP15 hearing device/Interacoustics and the NDD were compared. For this, the following paramenters were used: non-filtered click of 100 microsecond (µs), totaling 2000 stimuli in rarefied polarity, stimulation frequency of 13.1 clicks/s, intensity of 80 decibels normalized hearing level (dB nHL), with a window of 10 milliseconds and bandpass filter between 100 and 3000 Hertz (Hz). Significance level was set at 0.05. RESULTS: absolute latency and interpeak means for 76 normal-hearing individuals with the NDD were: wave I=1.50, III=3.57, V=5.53, I-III=2.06, III-V=1.96 and I-V=4.02. When analyzing results according to gender, there was a statistically significant difference for the absolute latencies of waves III and V and in interpeaks I-III and I-V. Mean amplitude value of wave I=0.384 microvolt (µV) and of wave V=0.825 µV. There was no statistically significant difference between the absolute latencies and interpeaks of the two devices in the same individual. CONCLUSION: the components of BAEP with the NDD in normal-hearing subjects were similar regarding the tested ears, with statistically lower latencies in women. The BAEP latencies in the same individual with NDD were similar to those obtained with the EP15 / Interacoustics. Normal values of BAEP were obtained in normal-hearing adults.