Wideband reflectance in newborns with absence of otoacoustic emissions

• Grant number: 12/06816-0
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Effective date (Start): August 01, 2012
• Effective date (End): September 30, 2013
• Field of knowledge: Health Sciences - Speech Therapy
• Principal Investigator: Renata Mota Mamede Carvallo
• Grantee: Thaís Lima Ferreira
• Host Institution: Faculdade de Medicina (FM). Universidade de São Paulo (USP). São Paulo , SP, Brazil

Abstract

There are two types of tests commonly employed in assessing newborn hearing. The first is the examination of otoacoustic emissions and the second test, which is part of the hearing screening, is the auditory brainstem response, known as ABR (Auditory Brainstem Response) or BERA (Brainstem Evoked Response Audiometry). Both OAE and ABR results may have been committed in case of any transient conditions of the external and middle ear. The condition of the middle ear should be monitored because the presence of effusion can further compromise hearing. Another test that can be performed is acoustic immittance, in order to differentiate conductive hearing loss of sensory loss. This consists of two measures: tympanometry and acoustic reflex. Tympanometry measures the Compliance (accepted energy) of the tympanic membrane, the gradient tympanometry, the resonant frequency of the middle ear and can be performed at various frequencies. Through acoustic reflex assesses the mobility ossicular eardrum and the integrity of auditory pathways. These two measures are especially important when considering the high incidence of otitis media with effusion (OME). The reflectance is a diagnostic procedure able to detect subtle middle ear dysfunction not detected in Timpanometria This procedure presents advantages by not depending on the pressurization of the ear canal and does not cause distortion in the channel. It is conducted in a range of frequencies instead of a single frequency evaluated as tympanometry. Therefore, it is possible that reflectance measurements can provide more information as fast as tympanometry problems in diagnosing the middle ear of children. Orçamento Outras Fontes Orçamento Benefícios Valor (R$) Valor (US$) Reserva Técnica 603,36 0,00 Total 603,36 0,00 Bolsas Iniciação Científica 6.033,60 0,00 Total 6.033,60 0,00 Total Geral 6.636,96 There are two types of tests commonly employed in assessing newborn hearing. The first is the examination of otoacoustic emissions and the second test, which is part of the hearing screening, is the auditory brainstem response, known as ABR (Auditory Brainstem Response) or BERA (Brainstem Evoked Response Audiometry). Both OAE and ABR results may have been committed in case of any transient conditions of the external and middle ear. The condition of the middle ear should be monitored because the presence of effusion can further compromise hearing. Another test that can be performed is acoustic immittance, in order to differentiate conductive hearing loss of sensory loss. This consists of two measures: tympanometry and acoustic reflex. Tympanometry measures the Compliance (accepted energy) of the tympanic membrane, the gradient tympanometry, the resonant frequency of the middle ear and can be performed at various frequencies. Through acoustic reflex assesses the mobility ossicular eardrum and the integrity of auditory pathways. These two measures are especially important when considering the high incidence of otitis media with effusion (OME). The reflectance is a diagnostic procedure able to detect subtle middle ear dysfunction not detected in Timpanometria This procedure presents advantages by not depending on the pressurization of the ear canal and does not cause distortion in the channel. It is conducted in a range of frequencies instead of a single frequency evaluated as tympanometry. Therefore, it is possible that reflectance measurements can provide more information as fast as tympanometry problems in diagnosing the middle ear of children.(AU)