Published ahead of print on October 2, 2003, doi:10.1164/rccm.200304-590OC
Am. J. Respir. Crit. Care Med., Volume 169, Number 2, January 2004, 163-167
A more recent version of this article appeared on January 15, 2004
Submitted on April 30, 2003
Accepted on September 27, 2003
Increased Upper Airway Collapsibility in Children with Obstructive Sleep Apnea During Wakefulness
David Gozal1* and Marilee M Burnside1
1 Division of Pediatric Sleep Medicine, University of Louisville and Kosair Children's Hospital Research Institute, Louisville, KY, USA
* To whom correspondence should be addressed. E-mail: david.gozal{at}louisville.edu.
Upper airway collapsibility is increased in children with sleep-disordered breathing (SDB), but during wakefulness active neural processes preserve upper airway patency, such that measurement of upper airway dynamics using acoustic pharyngometry may contribute to diagnostic accuracy in snoring children. Upper airway cross sectional area (CSA) measurements obtained from acoustic pharyngometry measurements was assessed iin 247 children referred for evaluation of suspected SDB and controls, before and after application of Cetacaine 1% spray to the pharyngeal introitus under visual inspection. Upper airway collapsibility (UAC) was determined from the % change in CSA after topical anesthesia. UAC measurements were reproducible 1-week apart in both controls and SDB patients (p<0.005). An UAC -30% exhibited high sensitivity and specificity in identification of all children with obstructive apnea-hypopnea index (AHI)>5 /hrTST in a prospective initial sample of 54 children and in a subsequent post-hoc sample of 94 snoring children. Thus, upper airway dynamic testing during wakefulness in response to a topical airway anesthetic may provide a useful clinical adjunct to the evaluation of snoring children, with more accurate identification of those children with SDB.
Key words: sleep disordered breathing; snoring; acoustic pharyngometry; topical anesthesia
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