title: Asleep home blood pressure monitoring in obstructive sleep apnea:  a pilot study.
abstract: BACKGROUND
  Obstructive sleep apnea (OSA) is known to be related to nocturnal blood pressure (BP) and nondipping hypertension. This pilot study evaluated night-time BP assessed using a home monitor in patients with OSA.
  
  
  METHODS
  Patients referred to a sleep clinic were subjected to polysomnography, clinic BP measurements, and home BP monitoring using a device that allows daytime (3 days, two duplicate readings per day) and automated night-time BP measurement (3 nights, three readings per night).
  
  
  RESULTS
  Thirty-nine patients were included [72% men, mean age 48.7±10.8 years, clinic BP 131.2±19.6/84.1±11.9 mmHg, apnea-hypopnea index (AHI): 35.2±25.7]. All BP measurements were significantly correlated with the polysomnography indices. There was a consistent trend toward stronger correlations of the night-time diastolic home BP with the AHI (r=0.56), the duration of desaturation (0.53), and the maximum (-0.57) and minimum (-0.48) arterial oxygen saturation (all P<0.001). In stepwise multivariate analysis (independent variables age, sex, body weight, smoking status, and BP parameters), the AHI was associated independently with weight and night-time diastolic home BP (R=0.53).
  
  
  CONCLUSIONS
  In patients with OSA, the assessment of night-time BP using a home monitor appears to be feasible and related to the severity of OSA. Given the wide availability of home BP monitoring in clinical practice, this method appears to be useful in the evaluation of BP in patients with OSA.
authors.affiliation: Third University Department of Medicine, Hypertension Center, Sotiria Hospital, Athens, Greece. gstergi@med.uoa.gr
authors.forename: George S
authors.initials: GS
authors.lastname: Stergiou
authors.forename: Evgenia
authors.initials: E
authors.lastname: Triantafyllidou
authors.forename: Kyriaki
authors.initials: K
authors.lastname: Cholidou
authors.forename: Anastasios
authors.initials: A
authors.lastname: Kollias
authors.forename: Antonios
authors.initials: A
authors.lastname: Destounis
authors.forename: Efthimia G
authors.initials: EG
authors.lastname: Nasothimiou
authors.forename: Evaggelos
authors.initials: E
authors.lastname: Markozannes
authors.forename: Manos
authors.initials: M
authors.lastname: Alchanatis
mesh_terms: D000328:Adult; D018660:Blood Pressure Monitoring, Ambulatory / Q000191:economics / Q000379:methods*; D005260:Female; D006801:Humans; D006973:Hypertension / Q000150:complications / Q000191:economics / Q000503:physiopathology*; D008297:Male; D008875:Middle Aged; D010865:Pilot Projects; D017286:Polysomnography / Q000379:methods*; D012890:Sleep; D020181:Sleep Apnea, Obstructive / Q000150:complications / Q000191:economics / Q000503:physiopathology*