Published ahead of print on April 30, 2003, doi:10.1164/rccm.200211-1275OC
Am. J. Respir. Crit. Care Med., Volume 168, Number 2, July 2003, 238-241
A more recent version of this article appeared on July 15, 2003
Submitted on November 7, 2002
Accepted on April 28, 2003
Effect of Oral Appliance Therapy on Upper Airway Collapsibility in Obstructive Sleep Apnea
Andrew T Ng1, Helen Gotsopoulos2, Jin Qian2, and Peter A Cistulli1*
1 Respiratory and Sleep Medicine, St George Hospital, Sydney, NSW, Australia; Medicine, University of New South Wales, Sydney, NSW, Australia,
2 Respiratory and Sleep Medicine, St George Hospital, Sydney, NSW, Australia
* To whom correspondence should be addressed. E-mail: p.cistulli{at}unsw.edu.au.
Oral appliance therapy is emerging as an alternative to continuous positive airway pressure for the treatment of obstructive sleep apnea. However, its precise mechanisms of action are yet to be defined. We examined the effect of a mandibular advancement splint on upper airway collapsibility during sleep in obstructive sleep apnea. Ten patients with proven obstructive sleep apnea had a custom-made mandibular advancement splint incrementally adjusted during an acclimatization period until the maximum comfortable limit of mandibular advancement was reached. Polysomnography with the splint was then performed. Following a one-week washout period, upper airway closing pressures during sleep (with and without mandibular advancement splint) were determined. Significant improvements with mandibular advancement splint therapy were seen in Apnea/Hypopnea Index (25.0 ± 3.1 versus 13.2 ± 4.5 /hour, p<0.03) and upper airway closing pressure in stage 2 sleep (-1.6 ± 0.4 versus -3.9 ± 0.6 cmH2O, p<0.01) and in slow wave sleep (-2.5 ± 0.7 versus -4.7 ± 0.6 cmH2O, p<0.02) compared to no therapy. These preliminary data indicate that mandibular advancement splint therapy is associated with improved upper airway collapsibility during sleep. The mediators of this effect remain to be determined.
Key words: Sleep apnea, oral appliances, upper airway collapsibility
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