Airway protection in sleeping infants in response to pharyngeal fluid stimulation in the supine position.

Abstract:

:This study was designed to evaluate upper airway protective mechanisms in response to pharyngeal fluid stimulation in healthy term and preterm infants at term equivalent age. Five term and seven preterm infants were studied and the following recorded: sleep state, cardiorespiratory function, and swallowing. Infusions of 0.9% saline and sterile water of volumes of 0.04, 0.2, and 0.35 mL were made during active (AS) and quiet sleep (QS). The effect of these variables on apnea (> or = 2 and > or = 5 s), swallowing, and arousal was examined. After pharyngeal infusion, apnea of > or = 2 and > or = 5 s did not change from spontaneous rates for both term and preterm infants. The most common response to pharyngeal infusion was swallowing. In AS, swallowing occurred after 65 and 73% and in QS after 40 and 64% of infusions in term and preterm infants, respectively. Swallowing was volume-related and occurred significantly more often in term infants after larger infusions of 0.35 and 0.2 mL (83 and 67%) compared with the 0.04 mL (19%) and after 0.2 mL compared with 0.04 mL for preterm infants (94 and 44%). At 0.2 mL, this was significantly higher in preterm compared with term infants (p < 0.01) and was the only significant difference between these infants. In response to pharyngeal fluid stimulation, airway defense in both full-term and preterm infants is maintained primarily by swallowing with no evidence of apnea.

journal_name

Pediatr Res

journal_title

Pediatric research

authors

Page M,Jeffery HE

doi

10.1203/00006450-199811000-00011

subject

Has Abstract

pub_date

1998-11-01 00:00:00

pages

691-8

issue

5

eissn

0031-3998

issn

1530-0447

journal_volume

44

pub_type

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