| The supraglottic effect of a reduction in expiratory mask pressure during continuous positive airway pressure. | |
| | |
MedLine Citation:
|
PMID: 22294817 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
|
STUDY OBJECTIVES: Patients with obstructive sleep apnea may have difficulty exhaling against positive pressure, hence limiting their acceptance of continuous positive airway pressure (CPAP). C-Flex is designed to improve comfort by reducing pressure in the mask during expiration proportionally to expiratory airflow (3 settings correspond to increasing pressure changes). When patients use CPAP, nasal resistance determines how much higher supraglottic pressure is than mask pressure. We hypothesized that increased nasal resistance results in increased expiratory supraglottic pressure swings that could be mitigated by the effects of C-Flex on mask pressure. DESIGN: Cohort study. SETTING: Sleep center. PARTICIPANTS: Seventeen patients with obstructive sleep apnea/hypopnea syndrome and a mechanical model of the upper airway. INTERVENTIONS: In patients on fixed CPAP, CPAP with different C-Flex levels was applied multiple times during the night. In the model, 2 different respiratory patterns and resistances were tested. MEASUREMENTS AND RESULTS: Airflow, expiratory mask, and supraglottic pressures were measured on CPAP and on C-Flex. Swings in pressure during expiration were determined. On CPAP, higher nasal resistance produced greater expiratory pressure swings in the supraglottis in the patients and in the model, as expected. C-Flex 3 produced expiratory drops in mask pressure (range -0.03 to -2.49 cm H(2)O) but mitigated the expira-tory pressure rise in the supraglottis only during a sinusoidal respiratory pattern in the model. CONCLUSIONS: Expiratory changes in mask pressure induced by C-Flex did not uniformly transmit to the supraglottis in either patients with obstructive sleep apnea on CPAP or in a mechanical model of the upper airway with fixed resistance. Data suggest that the observed lack of expiratory drop in supraglottic pressure swings is related to dynamics of the C-Flex algorithm. CITATION: Masdeu MJ; Patel AV; Seelall V; Rapoport DM; Ayappa I. The supraglottic effect of a reduction in expiratory mask pressure during continuous positive airway pressure. SLEEP 2012;35(2):263-272. |
| | |
Authors:
|
Maria J Masdeu; Amit V Patel; Vijay Seelall; David M Rapoport; Indu Ayappa |
Related Documents
:
|
18296357 - Effects of cocoa flavanols on risk factors for cardiovascular disease. 16176337 - Apparent effect on blood pressure is only partly responsible for the risk reduction due... 17278987 - Perindopril-based blood pressure-lowering therapy reduces amino-terminal-pro-b-type nat... 11816267 - Blood pressure as a surrogate end point for hypertension. 20537417 - Impact of genomic polymorphism on arterial hypertension after aortic coarctation repair. 8119527 - Effects of duodenal distention on fasting and postprandial antropyloroduodenal motility... |
Publication Detail:
|
Type: Journal Article Date: 2012-02-01 |
Journal Detail:
|
Title: Sleep Volume: 35 ISSN: 1550-9109 ISO Abbreviation: Sleep Publication Date: 2012 |
Date Detail:
|
Created Date: 2012-02-01 Completed Date: - Revised Date: - |
Medline Journal Info:
|
Nlm Unique ID: 7809084 Medline TA: Sleep Country: United States |
Other Details:
|
Languages: eng Pagination: 263-72 Citation Subset: IM |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
|
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: Daily Sleep and Fatigue Characteristics in Nulliparous Women during the Third Trimester of Pregnancy...
Next Document: Effects of a 3-hour sleep delay on sleep homeostasis in alcohol dependent adults.