Changes in Auditory Brainstem Response in very preterm and late preterm infants.

Area of Science:

• Neuroscience
• Developmental Pediatrics
• Audiology

Background:

• Preterm birth poses risks to neurodevelopment, including the auditory system.
• Auditory Brainstem Responses (ABR) are crucial for assessing auditory pathway maturation in infants.

Purpose of the Study:

• To compare Auditory Brainstem Response (ABR) latencies in very preterm and late preterm infants.
• To evaluate auditory system maturation at 1 and 3 months corrected age in these groups.

Main Methods:

• A prospective cohort study involving 80 preterm infants (40 very preterm, 40 late preterm).
• ABR traces were recorded using click stimuli at 70 and 30 dBnHL.
• Absolute and interpeak latencies were analyzed and compared between groups at corrected ages of 1 and 3 months.

Main Results:

• At 1 month corrected age, very preterm infants exhibited prolonged absolute and interpeak ABR latencies compared to late preterm infants.
• These prolonged latencies in very preterm infants significantly reduced by 3 months corrected age, suggesting accelerated maturation.
• Late preterm infants showed normal age-dependent latency reductions by 3 months corrected age.

Conclusions:

• Auditory maturation in preterm infants follows a typical 'caudal to rostral' pattern.
• Very preterm infants demonstrate less mature neuronal development at 1 month, which normalizes by 3 months corrected age.
• The study confirms catch-up maturation in the central auditory nervous system of very preterm infants.