[Assessment of retrocochlear hearing pathway activity in infants with central nervous system impairment occurring as an effect of perinatal asphyxia].
BACKGROUND
The most often changes in the central nervous system (CNS) occurring as an effect of perinatal asphyxia are found to be hypoxic-ischemic encephalopathy (HIE) in term newborns, peri- (PVH) or intraventricular hemorrhages (IVH) and periventricular leukomalacia (PVL) in preterm neonates. Chronic hypoxia is considered to affect the brainstem in infants, especially nuclei of the hearing pathway are vulnerable to low oxygen level. The aim of the study was to carry out the objective assessment of the retrocochlear hearing pathway activity using ABR in infants with CNS impairment occurring as an effect of perinatal asphyxia, imaged during trans-fontanel ultrasonography.


METHODS
To the investigation 36 infants with HIE, IVH or PVL were included, the control group encompassed 32 born at term, health children. ABR recordings were performed in 3 months old children using Nicolet Spirit System for clicks of 85 and 80 dB nHL.


RESULTS
No differences were found between latencies of waves I and II. ABR latencies of waves III, IV, V and interpeak latencies I-III, III-V, I-V were significantly delayed in InvG when compared to control patients. In conclusion, the brainstem activity in infants with CNS involvement as an effect of perinatal asphyxia is lower comparing to health children. Subclinical abnormalities as prolonged synaptic transmission of electric signal in retrocochlear auditory pathway were revealed.
Katedra i Oddzial Kliniczny Laryngologii w Zabrzu Slaskiego Uniwersytetu Medycznego w Katowicach.
Agnieszka
A
Widziszowska
Grzegorz
G
Namysłowski
Anna
A
Genge
Agata
A
Hajduk
Urszula
U
Godula-Stuglik
D000161:Acoustic Stimulation; D001238:Asphyxia Neonatorum / Q000175:diagnosis* / Q000503:physiopathology; D016022:Case-Control Studies; D002493:Central Nervous System Diseases / Q000175:diagnosis* / Q000209:etiology* / Q000503:physiopathology; D016057:Evoked Potentials, Auditory, Brain Stem; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D008297:Male; D017084:Otoacoustic Emissions, Spontaneous; D011930:Reaction Time
Ocena funkcji pozaślimakowej cześci drogi słuchowej u niemowlat ze zmianami w obrebie ośrodkowego układu nerwowego powstałymi na skutek asfiksji okołoporodowej.