Assessment of effect of nasal continuous positive pressure on laryngeal opening using fibre optic laryngoscopy
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.
METHODSNine 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.
RESULTSIn eight of
the infants the width: length ratio increased on CPAP; mean change
for group +24.4% (95% CI +11.9 to +37.9).
CONCLUSIONSNasal 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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