Abstract:
BACKGROUND:Reduction of nocturnal obstructive events during lateral position in patients with obstructive sleep apnea was previously reported. However, little information is available regarding mechanisms of the improvement and the precise pharyngeal site influenced by the lateral position. The authors tested the hypothesis that structural properties of the passive pharynx change by changing the body position from supine to lateral. METHOD:Total muscle paralysis was induced with general anesthesia in eight patients with obstructive sleep apnea, eliminating neuromuscular factors contributing to pharyngeal patency. The cross-sectional area of the pharynx was measured endoscopically at different static airway pressures. Comparison of static pressure-area plot between the positions allowed assessment of the influence of the position change on the mechanical properties of the pharynx. RESULTS:The static pressure-area curves of the lateral position were above those of the supine position, with increasing maximum cross-sectional area and decreasing the closing pressure at both retropalatal and retroglossal airways. CONCLUSIONS:Lateral position structurally improves maintenance of the passive pharyngeal airway in patients with obstructive sleep apnea.
journal_name
Anesthesiologyjournal_title
Anesthesiologyauthors
Isono S,Tanaka A,Nishino Tdoi
10.1097/00000542-200210000-00006subject
Has Abstractpub_date
2002-10-01 00:00:00pages
780-5issue
4eissn
0003-3022issn
1528-1175pii
00000542-200210000-00006journal_volume
97pub_type
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