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[ABR short latency negative responses in neonates]
1Specjalistyczne Centrum, Diagnostyczno-Zabiegowe Medicina. olafzag@poczta.onet.pl
Przeglad Lekarski
|August 2, 2005
Summary
Short latency negative responses (SLNRs) in auditory brainstem responses are measurable with high-intensity sounds. Click-evoked SLNRs in infants are easier to evaluate and may indicate inner ear damage.
Area of Science:
- Neuroscience
- Audiology
- Pediatrics
Background:
- Short latency negative responses (SLNRs) are auditory brainstem response waves occurring between waves I and III.
- SLNRs are elicited by high-intensity acoustic stimuli.
Purpose of the Study:
- To compare SLNRs evoked by broadband clicks and 500 Hz tone bursts in high-risk infants.
- To assess the diagnostic potential of SLNRs for detecting sensorineural hearing loss and inner ear damage.
Main Methods:
- Auditory brainstem responses were recorded in high-risk infants using broadband 2000-4000 Hz clicks and 500 Hz tone bursts.
- SLNR amplitudes and latencies were measured and compared between stimulation types.
- SLNRs were analyzed in relation to hearing threshold values and sensorineural hearing loss.
Main Results:
- Mean SLNR amplitude was higher with click stimulation (701.8 nV) than tone burst stimulation (590.3 nV).
- SLNR latency was shorter with click stimulation (3.21 ms) compared to tone burst stimulation (5.3 ms).
- SLNRs were absent in 3 ears with sensorineural hearing loss, suggesting significant inner ear damage.
Conclusions:
- Click-evoked SLNRs are easier to evaluate in high-risk infants.
- SLNRs show potential for identifying severe inner ear damage in cases of sensorineural hearing loss.
- Further research is warranted to establish SLNRs as a clinical tool.