Sex and ear differences of brain-stem acoustic evoked potentials in a sample of normal full-term newborns. Normative study.
The present paper reports a normative study of the BAEPs recorded from 80 normal full-term newborns by using a rarefaction click at 70, 60, 40, 20 dB HL. Positive, negative peaks and the relative amplitudes were measured. Means, standard deviations and 95% and 99% confidence limits were calculated for each component, for positive and negative IPLs and amplitude ratios. A normality test distribution showed that each component had normal distribution except for wave PIII at 70 dB and at 60 dB HL because of its index of kurtosis and for IPLs PII-PIII and NII-NIII at 70 and 60 dB HL. MLRA was performed and significant statistical differences were found for sex, ears and intensities. Females had the latencies of waves PIII, PIV, PV, NII and NIV shorter than males. The BAEPs obtained from the left ear had shorter latencies for positive and negative peaks. Latencies, amplitude and morphology of the BAEPs vary with variations of the intensity. The IPLs PII-PV, PIII-PV and PIV-PV were not affected by changes of intensity.
Chiarenza
G A
GA
Istituto di Neuropsichiatria Infantile, Università degli Studi di Milano, Italy.
D'Ambrosio
G M
GM
Cazzullo
A G
AG
D001307:Auditory Perception / Q000502:physiology*; D001933:Brain Stem; D004423:Ear / Q000502:physiology*; D005072:Evoked Potentials, Auditory; D005260:Female; D006128:Growth; D006801:Humans; D007231:Infant, Newborn; D008297:Male; D012727:Sex Characteristics