Abdominal compression increases upper airway collapsibility during sleep in obese male obstructive sleep apnea patients

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dc.contributor.authorStadler, D.
dc.contributor.authorMcEvoy, R.
dc.contributor.authorSprecher, K.
dc.contributor.authorThomson, K.
dc.contributor.authorRyan, M.
dc.contributor.authorThompson, C.
dc.contributor.authorCatcheside, P.
dc.date.issued2009
dc.description.abstract<h4>Study objectives</h4>Abdominal obesity, particularly common in centrally obese males, may have a negative impact on upper airway (UA) function during sleep. For example, cranial displacement of the diaphragm with raised intra-abdominal pressure may reduce axial tension exerted on the UA by intrathoracic structures and increase UA collapsibility during sleep.<h4>Design</h4>This study aimed to examine the effect of abdominal compression on UA function during sleep in obese male obstructive sleep apnea patients.<h4>Setting</h4>Participants slept in a sound-insulated room with physiologic measurements controlled from an adjacent room.<h4>Participants</h4>Fifteen obese (body mass index: 34.5 +/- 1.1 kg/m2) male obstructive sleep apnea patients (apnea-hypopnea index: 58.1 +/- 6.8 events/h) aged 50 +/- 2.6 years participated.<h4>Interventions</h4>Gastric (PGA) and transdiaphragmatic pressures (P(DI)), UA closing pressure (UACP), UA airflow resistance (R(UA)), and changes in end-expiratory lung volume (EELV) were determined during stable stage 2 sleep with and without abdominal compression, achieved via inflation of a pneumatic cuff placed around the abdomen. UACP was assessed during brief mask occlusions.<h4>Measurements and results</h4>Abdominal compression significantly decreased EELV by 0.53 +/- 0.24 L (P=0.045) and increased PGA (16.2 +/- 0.8 versus 10.8 +/- 0.7 cm H2O, P < 0.001), P(DI) (11.7 +/- 0.9 versus 7.6 +/- 1.2 cm H2O, P < 0.001) and UACP (1.4 +/- 0.8 versus 0.9 +/- 0.9 cm H2O, P = 0.039) but not R(UA)(6.5 +/- 1.4 versus 6.9 +/- 1.4 cm H2O x L/s, P=0.585).<h4>Conclusions</h4>Abdominal compression negatively impacts on UA collapsibility during sleep and this effect may help explain strong associations between central obesity and obstructive sleep apnea.
dc.description.statementofresponsibilityDaniel L. Stadler, R. Doug McEvoy, Kate E. Sprecher, Kieron J. Thomson, Melissa K. Ryan, Courtney C. Thompson, Peter G. Catcheside
dc.description.urihttp://www.ncbi.nlm.nih.gov/pubmed/20041593
dc.identifier.citationSleep, 2009; 32(12):1579-1587
dc.identifier.doi10.1093/sleep/32.12.1579
dc.identifier.issn0161-8105
dc.identifier.issn1550-9109
dc.identifier.orcidMcEvoy, R. [0000-0002-5759-0094]
dc.identifier.orcidCatcheside, P. [0000-0002-9372-6788]
dc.identifier.urihttp://hdl.handle.net/2440/57960
dc.language.isoen
dc.publisherAmer Academy Sleep Medicine
dc.rightsCopyright © 2009 by the Associated Professional Sleep Societies, LLC
dc.source.urihttps://doi.org/10.1093/sleep/32.12.1579
dc.subjectObstructive sleep apnea
dc.subjectabdominal loading
dc.subjectlung volume
dc.subjectcaudal traction
dc.titleAbdominal compression increases upper airway collapsibility during sleep in obese male obstructive sleep apnea patients
dc.typeJournal article
pubs.publication-statusPublished

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