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Maturational time course for the ABR in preterm and full term infants
1Department of Psychology, University of Calgary, Alberta, Canada.
Insights
Premature infants show delayed auditory brainstem response (ABR) maturation compared to full-term infants, particularly in wave I and V latencies. Differences in maturation timelines for ABRs are linked to factors like otitis media in premature infants.
Area of Science:
- Auditory Neuroscience
- Developmental Pediatrics
- Neurophysiology
Background:
- Auditory Brainstem Response (ABR) maturation is influenced by innate, environmental, and health factors.
- Premature infants may exhibit distinct ABR maturation profiles compared to full-term infants.
Purpose of the Study:
- To compare the ABR maturation profiles of full-term and healthy premature infants.
- To characterize maturational changes using exponential function time constants.
Main Methods:
- Analysis of ABRs from 465 full-term infants and 179 healthy premature infants (tested 1-9 times from birth to 5 years).
- Modeling latency changes with exponential functions to determine time constants.
Main Results:
- Full-term infants required one exponential (5 weeks) for Wave I latency and two (5 and 100 weeks) for Wave V latency.
- Premature infants exhibited longer time constants for Wave I and Wave V latency maturation.
- No significant difference in the Wave I-Wave V interval maturation was observed between groups.
Conclusions:
- Premature birth is associated with prolonged ABR maturation timelines for specific waves.
- Observed latency differences in premature infants may be partly explained by a higher incidence of otitis media.
- ABR maturation is a sensitive indicator of neurodevelopmental trajectories in infants.
Abstract:
Since maturation of ABR amplitude and latency in principle are dependent on innate as well as environmental factors and the health of the infant, it is conceivable that prematurely born infants show a maturation profile that is different from that of full term infants. In order to unequivocally address this we analyzed ABRs recorded in 465 full term infants and in 179 healthy prematurely born, of which 65 were tested once and 113 were tested (2-9 occasions) at different ages from birth up to 5 years of age. Our emphasis was on a description in terms of time constants of the exponential functions used to describe the maturational changes. In general one exponential function (time constant about 5 weeks) was needed to describe the changes in full term wave I latency. The sum of two exponentials was required to describe adequately the latency changes for full term wave V (time constants about 5 weeks and 100 weeks). In prematurely born infants all time constants for the wave I and wave V changes were longer than in the full term. For the wave I-wave V interval no difference was found between the two populations. The differences in the time course for wave I and wave V latency can be accounted for by the higher incidence of otitis media in the prematurely born group.