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Arch Dis Child Fetal Neonatal Ed 1999;80:F230-F232 ( May )

Assessment of effect of nasal continuous positive pressure on laryngeal opening using fibre optic laryngoscopy

P Gaon, S Lee, S Hannan, D Ingram, A D Milner

Department of Paediatrics, United Medical and Dental School of Guy's and St Thomas' Hospital, London SE1 7EH

Correspondence to: Professor A D Milner.

Accepted 17 November 1998

AIM---To assess the effect of nasal continuous positive airways pressure (CPAP) on the dimensions of the laryngeal opening.
METHODS---Nine preterm infants who had previously received ventilatory support for respiratory distress syndrome (RDS) were studied. All were receiving nasal CPAP. The laryngeal opening was visualised using a fibre optic video camera system. The ratio of width to length of the opening was measured on and off CPAP.
RESULTS---In eight of the infants the width: length ratio increased on CPAP; mean change for group +24.4% (95% CI +11.9 to +37.9).
CONCLUSIONS---Nasal CPAP seems to dilate the larynx. This may explain the selective beneficial effects of CPAP on mixed and obstructive apnoea.


Keywords: nasal continuous positive airway pressure; apnoea of prematurity; laryngoscopy; vocal cords

© 1999 by Archives of Disease in Childhood


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