[Auditory brainstem responses in full-term infants and pre-term neonates].
Auditory Brainstem Responses (ABR) and behavioural threshold were studied in 52 infants born between 28-41 weeks of gestational age (GA), which have been between 33-42 weeks of postconceptional age (PCA) (Gestational age + postnatal age). Peak latencies of wave V and interpeak latency I-V were measured as a function of maturational changes and stimulus intensities. Behavioural audiometric threshold to pure tone were determined through behavioural observation of auditory-palpebral reflex. In the group of full-term infants threshold responses for clicks lay between 32.5 to 35.1 dB. In the group of pre-term neonates the threshold lay between 37.6 do 40 dB. Behavioural audiometry disclosed that full-term infants responded to pure tone stimuli with mean threshold of 86 dB, while the pre-term infants would respond to pure stimuli at 91 dB. The latency of wave V responses decreases progressively from a mean of 7.84 ms at 33-35 weeks of PCA, to 6.57 ms at 40-41 weeks of PCA. The ABR shows a remarkable variability in wave V latency with relatively stable interpeak latency I-V with decreases stimulus intensities.
Reroń
E
E
Kliniki Otolaryngologicznej AM w Krakowie.
Sekuła
J
J
Borkowski
W
W
D016057:Evoked Potentials, Auditory, Brain Stem / Q000502:physiology*; D006801:Humans; D007231:Infant, Newborn / Q000502:physiology*; D007234:Infant, Premature / Q000502:physiology*; D011930:Reaction Time / Q000502:physiology
Audiometria odpowiedzi pnia mózgowego (ABR) u noworodków urodzonych o czasie i przedwcześnie.