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Brainstem auditory evoked response in normal term neonates
Laura M F F Guilhoto1, Virgínia S Quintal, Maria T Z da Costa
1Setor de Neurofisiologia Clínica, Divisão de Clínica Médica, Hospital Universitário, Universidade de São Paulo, São Paulo, SP, Brasil. lauragui@usp.br
Arquivos De Neuro-Psiquiatria
|February 6, 2004
Summary
Brainstem auditory evoked response (BAER) provides crucial reference values for neonatal hearing assessment. This study established normal BAER latencies in healthy newborns, aiding early diagnosis of auditory and neurological issues.
Area of Science:
- Neuroscience
- Audiology
- Neonatology
Background:
- Brainstem auditory evoked response (BAER) is vital for detecting neonatal auditory and neurological dysfunction.
- Early diagnosis and intervention are critical for improving outcomes in affected neonates.
Purpose of the Study:
- To establish normative Brainstem auditory evoked response (BAER) latencies in healthy, full-term neonates.
- To provide reference values for BAER testing within a university hospital setting.
Main Methods:
- BAER was conducted on 47 normal newborns (gestational age 37-40 weeks) on their second day of life.
- Stimuli consisted of 80 dBHL clicks at 10/sec, alternating polarity, presented monaurally.
- 2000 trials were averaged per ear, with duplication for reliability.
Main Results:
- Mean wave latencies (msec): I (1.79), II (2.88), III (4.54), IV (5.86), V (6.75).
- Mean inter-peak latencies (IPL) (msec): I-III (2.75), III-V (2.22), I-V (4.97).
- Standard deviations were provided for all measured latencies.
Conclusions:
- The study successfully generated reference BAER latency values for normal term neonates.
- These normative data are essential for accurate interpretation of BAER tests in clinical practice.
- This research supports the use of BAER for early identification of auditory and neurological impairments in newborns.