Middle ear resonance in infants: Age effects
Int. arch. otorhinolaryngol. (Impr.)
;
16(3): 353-357, jul.-set. 2012. ilus, tab
Artículo
en Portugués
| LILACS
| ID: lil-646371
ABSTRACT
Introduction:
The resonant frequency is the probe frequency in which susceptance is 0 due to the neutralization of the forces of mass and stiffness components that control the middle ear. This frequency can be evaluated by multifrequency tympanometry, and the normality value for adults ranges 800-1,200 Hz. Studies about resonant frequency in children are scarce.Aim:
Identify the variation of the resonant frequency in infants between the first days after birth and the third month of life.Method:
Prospective study. Thirty newborns were evaluated at 2 different times at the neonatal phase up to 12 days of life, and between 72 and 84 days of life. In the first evaluation, we carried out otoacoustic emissions and identified the resonant frequency, and identified the resonant frequency again in the second evaluation.Results:
In the first evaluation, we determined a mean resonance value of 250 Hz for both ears, while that in the second evaluation was 385 Hz. In both assessments, we found no significant differences between the ears. There was a significant difference between the first and second evaluation.Conclusion:
The middle ear resonant frequency in infants is lower in the first days of life due to the influence of the mass component. The present study demonstrated that the resonance frequency increased in the first months of life...
Texto completo:
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Índice:
LILACS (Américas)
Asunto principal:
Pruebas de Impedancia Acústica
/
Factores de Riesgo
/
Emisiones Otoacústicas Espontáneas
/
Oído Medio
/
Pérdida Auditiva
/
Pruebas Auditivas
Tipo de estudio:
Estudio de etiología
/
Estudio observacional
/
Estudio pronóstico
/
Factores de riesgo
Límite:
Adolescente
/
Niño
/
Femenino
/
Humanos
/
Masculino
/
Recién Nacido
Idioma:
Portugués
Revista:
Int. arch. otorhinolaryngol. (Impr.)
Asunto de la revista:
Otorrinolaringologia
Año:
2012
Tipo del documento:
Artículo
País de afiliación:
Brasil
Institución/País de afiliación:
Universidade de São Paulo/BR
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