Abstract:
BACKGROUND:Obstructive sleep apnea (OSA) is associated with increased cardiovascular morbidity and mortality which may be mediated by increased arterial stiffness and endothelial dysfunction. Continuous positive airway pressure (CPAP) therapy improves excessive daytime somnolence (EDS), but its effect on vascular function in patients without preexisting cardiovascular disease (CVD) is unclear. METHODS:Fifty-three patients with OSA defined as an apnea-hypopnea index (AHI) of ⩾15 and without CVD were recruited into a double-blind, randomized, placebo-controlled, crossover trial of 12weeks of CPAP therapy, of whom 43 participants completed the study protocol. Arterial stiffness was assessed by measuring the augmentation index (AIx) and pulse wave velocity (PWV) by applanation tonometry and cardiovascular magnetic resonance imaging to determine aortic distensibility. Endothelial function was assessed by measuring vascular reactivity after administration of salbutamol and glyceryl trinitrate. RESULTS:CPAP therapy lowered systolic blood pressure (SBP) (126mmHg [standard deviation {SD}, 12] vs 129mmHg [SD, 14]; P=.03), with a trend towards reduced AIx (15.5 [SD, 11.9] vs 16.6 [SD, 11.7]%; P=.08) but did not modify endothelial function. When subjects with (n=24) and without (n=19) EDS were separately examined, no effect of CPAP therapy on vascular function was seen. CONCLUSIONS:In patients without overt CVD, CPAP therapy had a nonsignificant effect on AIx and did not modify endothelial function.
journal_name
Sleep Medjournal_title
Sleep medicineauthors
Jones A,Vennelle M,Connell M,McKillop G,Newby DE,Douglas NJ,Riha RLdoi
10.1016/j.sleep.2013.08.786subject
Has Abstractpub_date
2013-12-01 00:00:00pages
1260-5issue
12eissn
1389-9457issn
1878-5506pii
S1389-9457(13)01150-7journal_volume
14pub_type
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