title: The effect of correction of sleep-disordered breathing on BP in untreated hypertension.
abstract: OBJECTIVE
  To compare BP response to 3 weeks of nasal continuous positive airway pressure (CPAP) in hypertensive patients with and without sleep-disordered breathing (SDB).
  
  
  METHODS
  A controlled, interventional trial of nasal CPAP in patients with and without SDB.
  
  
  METHODS
  Twenty-four men, aged 30 to 60 years, with mild to moderate untreated hypertension recruited from employee health and primary care clinics.
  
  
  METHODS
  Based on in-laboratory polysomnography, 14 hypertensive patients had SDB, defined by five or more episodes of apnea and hypopnea per hour of sleep (apnea-hypopnea index [AHI], > or = 5), and 10 had no SDB (AHI, < 5). We performed 24-h ambulatory BP monitoring on all patients at baseline, during CPAP, and after CPAP treatment. In patients with an AHI > or = 5, nasal CPAP was titrated to reduce the AHI to < 5. Patients with an AHI < 5 received CPAP of 5 cm H(2)O to control for any potential effect of CPAP per se on BP. Both groups received CPAP for 3 weeks.
  
  
  RESULTS
  After adjusting for age and body mass index, the mean nocturnal systolic and diastolic BP changes after CPAP treatment in the SDB group were significantly different from those in the no-SDB group: -7.8 vs +0.3 mm Hg (p = 0.02), and -5.3 vs -0.7 mm Hg (p = 0.03), respectively. There was a similar, although statistically insignificant, difference in the adjusted mean daytime systolic and diastolic BP changes after CPAP treatment between the two groups (-2.7 vs +0.4 mm Hg and -2.3 vs -1.7 mm Hg, respectively).
  
  
  CONCLUSIONS
  Three weeks of nasal CPAP treatment of SDB in hypertensive men caused the lowering of nocturnal systolic and diastolic BP values, suggesting that increased nocturnal BP in persons with hypertension was causally related to the apnea and hypopnea events of SDB.
authors.affiliation: Department of Medicine, Section of General Internal Medicine, University of Wisconsin Medical School, 2828 Marshall Court, Suite 100, Madison, WI 53705, USA.
authors.forename: K Mae
authors.initials: KM
authors.lastname: Hla
authors.forename: James B
authors.initials: JB
authors.lastname: Skatrud
authors.forename: Laurel
authors.initials: L
authors.lastname: Finn
authors.forename: Mari
authors.initials: M
authors.lastname: Palta
authors.forename: Terry
authors.initials: T
authors.lastname: Young
mesh_terms: D000328:Adult; D000704:Analysis of Variance; D018660:Blood Pressure Monitoring, Ambulatory; D005500:Follow-Up Studies; D006801:Humans; D006973:Hypertension / Q000150:complications / Q000175:diagnosis*; D016014:Linear Models; D008297:Male; D008875:Middle Aged; D015999:Multivariate Analysis; D010349:Patient Compliance; D017286:Polysomnography; D011175:Positive-Pressure Respiration / Q000379:methods*; D011336:Probability; D012016:Reference Values; D012129:Respiratory Function Tests; D012720:Severity of Illness Index; D020181:Sleep Apnea, Obstructive / Q000150:complications / Q000175:diagnosis / Q000628:therapy*; D016896:Treatment Outcome