Hernández HRJ, Hernández ALM, Castillo MN, De la Rosa MN, Martínez EJ, Flores SR, Torcida GME, Hernández NR

Language: Spanish
References: 15
Page: 63-68
PDF size: 116.85 Kb.

ABSTRACT

Introduction: the ear acoustic emissions (EAE) are produced from pure low intensity tones coming from the cochlea in response to a stimulus. Hypocusia in the neonate may be detected by universal hearing screening programs using EAE that have a sensitivity of 91 % and specificity of 85 %.
Objective: to define the normal limits we measured the EAE in a group of healthy newborns and calculated the media and standard deviation (SD). Patients and methods: We enrolled 280 healthy neonates, previous external ear evaluation for permeability and we measured the EAE at 7 to 30 days of life at 2000, 2500, 3187, 4000, 5062 y 6375 Hz, using a 55-65 dB stimulus for each frequency band.
Results: in each frequency band evaluated we calculated the media: 10.76, 9.16, 9.46, 7.89, 4.83, 2 dB SPL, and minus two SD: 0.54, –0.33, 0.06, –2.04, –4.37, –7.43 dB SPL, that we considered the lower limit of normality for both ears in each frequency band tested. There were no significant differences between measure-ments in both ears (p › 0.05).
Conclusions: the EAE measurement is an easy, and low cost test that can be used to make the universal hearing screening accessible. These results support the normal levels of EAE and the Corti organ function in healthy newborns.

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