Auditory brainstem response in neonates during the first 48 hours after birth

Area of Science:

• Neonatal audiology
• Neurophysiology
• Pediatric hearing assessment

Background:

• Auditory brainstem response (ABR) is crucial for assessing infant hearing.
• Early postnatal auditory system development is not fully understood.
• Reliable ABR measurements in neonates can be challenging due to their state.

Purpose of the Study:

• To investigate the feasibility and reliability of ABR recordings in neonates within the first 48 hours of life.
• To track changes in ABR measures over the early postnatal period.
• To assess middle ear function changes in neonates during the first 48 hours.

Main Methods:

• Auditory brainstem response (ABR) was recorded in 20 neonates at three time points: ~15 minutes, 2 hours, and 48 hours after birth.
• Recordings were attempted during different postnatal states, including the first period of reactivity.
• Amplitude ratio of wave V to wave I was analyzed.

Main Results:

• Reliable ABR data could not be obtained during the initial period of postnatal reactivity (~15 minutes after birth).
• ABR responses showed gradual improvement at 2 and 48 hours postpartum.
• No significant changes in middle ear function were observed between 2 and 48 hours postpartum.

Conclusions:

• Early ABR recordings in neonates are challenging due to physiological state.
• ABR testing becomes more reliable within the first 48 hours after birth as auditory pathways mature.
• Further research is needed to refine ABR protocols for optimal neonatal hearing screening.