Audiological and genetics studies in high-risk infants

Area of Science:

• Pediatrics
• Audiology
• Genetics

Background:

• Hearing is crucial for social integration and understanding the external world.
• Newborn hearing screening identifies infants with potential hearing deficits.
• High-risk infants require comprehensive follow-up evaluations after failing initial screening.

Purpose of the Study:

• To analyze hearing, medical, and genetic evaluations of high-risk infants who failed newborn hearing screening.
• To identify the prevalence and types of hearing loss in this vulnerable population.
• To investigate potential risk factors and genetic etiologies associated with hearing loss.

Main Methods:

• A clinical and experimental study involving 38 neonates (1-6 months old).
• Procedures included medical interviews, immittance testing, Brainstem Auditory Evoked Potential (BAEP), Transient Evoked Otoacoustic Emissions (TEOAE), and otorhinolaryngological evaluations.
• DNA extraction from oral mucosa was performed for genetic analysis.

Main Results:

• Hearing loss was identified in 58% of the high-risk infants.
• Conduction hearing loss was present in 31.5% and sensorineural hearing loss in 28.9% of cases.
• No statistically significant differences were found regarding gender or risk factors; term infants showed a higher prevalence of hearing loss. Common genetic mutations were not detected.

Conclusions:

• The majority of high-risk infants evaluated had some form of hearing loss.
• Hearing loss is a significant issue in high-risk infants requiring thorough investigation.
• Further research is needed to identify the specific causes of hearing loss in these infants, especially when common genetic mutations are absent.