Abstract:
OBJECTIVE:Pulse wave attenuation, which occurs in association with obstructive sleep apnea (OSA), is sympathetically mediated. We compared the effect of Doxazosin (DO, a peripheral alpha-receptor inhibitor) and Enalapril (EN, an ACE inhibitor) on digital vasoconstriction and nocturnal blood pressure (BP) in hypertensive OSA patients. METHODS:A double-blind, crossover study comparing equipotent dosages of DO (4 mg/day for 2 weeks with 8 mg/day for an additional 2 weeks) and EN (10mg/day and 20mg/day, respectively) was undertaken in 16 male OSA patients (age 55+/-7 years, body mass index 30.1+/-3.8 kg/m(2)) with hypertension. Assessments including ambulatory 24-h BP, full-night polysomnography with simultaneous peripheral arterial tone (PAT) and beat-to-beat finger BP monitoring (Finapres) were made at the end of each treatment period. Nighttime BP and digital vasoconstrictions associated with apneic events (measured as the ratio of PAT amplitudes during and after apneas) were analyzed. RESULTS:There were no differences between the two treatments in the 24-h BP profile and OSA severity. But the nighttime average beat-to-beat finger BP was significantly higher under DO treatment (systolic BP 129+/-13 vs. 119+/-23 mm Hg, P=0.02; diastolic BP 81+/-12 vs. 74+/-14 mm Hg, P=0.04, DO and EN respectively). In a linear mixed effects regression model, the PAT ratio during apnea increased 5.3% under DO compared with EN (P<0.0001). Each percentage decrease of apneic related oxygen desaturation was associated with 0.9% decrease in the PAT ratio (P<0.0001). REM sleep was associated with 2.2% decrease of PAT ratio compared to NREM sleep (P=0.002). CONCLUSION:Digital vasoconstrictions associated with apneic events are alpha-receptor mediated. DO compared to EN has a proportionally poor effect on nocturnal BP control in OSA patients, which may be due to the enhanced sympathetic nervous system activity characteristic of this condition.
journal_name
Sleep Medjournal_title
Sleep medicineauthors
Zou D,Grote L,Eder DN,Radlinski J,Hedner Jdoi
10.1016/j.sleep.2009.10.004subject
Has Abstractpub_date
2010-03-01 00:00:00pages
325-8issue
3eissn
1389-9457issn
1878-5506pii
S1389-9457(10)00067-5journal_volume
11pub_type
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