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Hearing

Hearing

When we hear a sound, our nervous system is detecting sound waves—pressure waves of mechanical energy traveling through a medium. The frequency of the wave is perceived as pitch, while the amplitude is perceived as loudness.

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Neonatal Murine Cochlear Explant Technique as an In Vitro Screening Tool in Hearing Research

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Newborn hearing screening: what are we missing?

M A Mannan, S M Choudhury, A C Dey

Bangladesh Medical Research Council Bulletin

|June 30, 2015

Summary

Universal newborn hearing screening using Transient Evoked Otoacoustic Emissions (TEOAEs) is recommended. Over 32% of newborns required re-screening, with factors like low birth weight and infections being significant indicators of potential hearing impairment.

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Area of Science:

Neonatal care
Audiology
Public health

Background:

Neonatal hearing impairment affects speech and cognitive development.
Early detection through screening is crucial for timely intervention.
Transient Evoked Otoacoustic Emissions (TEOAEs) is a reliable screening method.

Purpose of the Study:

To assess newborn hearing status via TEOAEs at initial screening.
To identify the correlation between abnormal hearing screening results and established risk factors.
To advocate for universal newborn hearing screening protocols.

Main Methods:

Prospective observational study of 168 neonates in a tertiary care hospital.
Hearing impairment screening using TEOAEs before hospital discharge.
Analysis of risk factors based on American Academy of Pediatrics criteria.

Main Results:

A significant refer rate of 32.7% was observed in the screened neonate population.
Key risk factors associated with abnormal hearing included small for gestational age, in-utero infections, ototoxic medication exposure, very low birth weight (<1500g), sepsis/meningitis, and hyperbilirubinemia.
All identified risk factors showed statistical significance (p < 0.0001).

Conclusions:

Universal hearing screening for all newborns is strongly recommended.
Early identification of hearing deficits can be achieved through TEOAE screening.
Risk factor analysis highlights specific neonatal conditions requiring heightened audiological surveillance.