Incidence and pattern of hearing impairment in children with ≤ 800 g birthweight in British Columbia, Canada
Article first published online: 8 SEP 2011
© 2011 The Author(s)/Acta Pædiatrica © 2011 Foundation Acta Pædiatrica
Volume 101, Issue 2, pages e48–e54, February 2012
How to Cite
Synnes, A. R., Anson, S., Baum, J. and Usher, L. (2012), Incidence and pattern of hearing impairment in children with ≤ 800 g birthweight in British Columbia, Canada. Acta Paediatrica, 101: e48–e54. doi: 10.1111/j.1651-2227.2011.02437.x
- Issue published online: 9 JAN 2012
- Article first published online: 8 SEP 2011
- Accepted manuscript online: 8 AUG 2011 12:16PM EST
- Received 19 May 2011; revised 20 July 2011; accepted 3 August 2011
- Hearing impairment;
- Neurodevelopmental outcome;
Aim: This study aimed to evaluate changes over time in the characteristics of permanent hearing impairment (HI) in extremely low-birthweight (ELBW ≤800 g) children.
Methods: Data from sequential visits up to 5 years of age assessing hearing and other neurodevelopmental outcomes were extracted from a cohort of ELBW subjects born between 1983 and 2006 at a single Canadian site. Trends in HI incidence, severity and association with other impairments were analysed in three 8-year epochs.
Results: Fifty of 586 ELBW children had a HI. HI rates increased from 5% in epoch 1 to 7% in epoch 2–13% in epoch 3 (p = 0.01). Mild HI decreased from 78% in epoch 1 to 35% in epoch 3 (p = 0.03). Median age at diagnosis decreased from 13 to 8 months. Comorbidities were more common in HI children than non-HI children: cerebral palsy (40% vs 14%, p < 0.0001)), cognitive (38% vs 12%, p < 0.0001) and visual impairments (16% vs 6%, p = 0.009).
Conclusion: The incidence and severity of hearing impairment in a cohort of extremely low-birthweight children increased significantly from 5% to 13% (p = 0.01) over a 24-year period. Comorbidities were common. Potentially modifiable causes are explored.