Cochlear function in 1-year-old term infants born with hypoxia-ischaemia or low Apgar scores
Article first published online: 7 APR 2011
© 2011 The Authors. Journal of Paediatrics and Child Health © 2011 Paediatrics and Child Health Division (Royal Australasian College of Physicians)
Journal of Paediatrics and Child Health
Volume 48, Issue 2, pages 160–165, February 2012
How to Cite
Jiang, Z. D., Zang, Z. and Wilkinson, A. R. (2012), Cochlear function in 1-year-old term infants born with hypoxia-ischaemia or low Apgar scores. Journal of Paediatrics and Child Health, 48: 160–165. doi: 10.1111/j.1440-1754.2011.02066.x
- Issue published online: 9 FEB 2012
- Article first published online: 7 APR 2011
- Accepted for publication 21 November 2010.
- hearing impairment;
- otoacoustic emissions
Aim: To examine the influence of perinatal hypoxia-ischaemia (HI) or low Apgar scores on distortion product otoacoustic emissions (DPOAEs) in infants at 1 year and detect any postnatal changes.
Methods: Eighty-eight term infants born with perinatal HI or low Apgar scores alone were recruited at 1 year of age. The ears with type A tympanogram (normal) were studied with DPOAEs at 10 frequencies between 0.5 kHz and 10 kHz.
Results: DPOAE pass rates were decreased at all frequencies 1–10 kHz, particularly 1 and 2 kHz in both infants born with HI and those with low Apgar scores (χ2= 3.80–15.09, P < 0.05–0.01). Overall pass rates in the two groups were also decreased (X2= 10.78 and 12.12, P < 0.01 and 0.01). No marked differences were found between infants born with HI and those with low Apgar score. Compared with those recorded at 1 and 6 months, DPOAE pass rates at 1 year were increased slightly in infants born with HI, but showed no marked changes in those born with low Apgar scores.
Conclusions: DPOAE pass rates, mainly at 1 and 2 kHz, were decreased at 1 year in infants born with perinatal HI and low Apgar scores, suggesting a relative poor cochlear function. Further studies are needed to ascertain the hearing acuity.