title: Age-dependent associations between sleep-disordered breathing and hypertension: importance of discriminating between systolic/diastolic hypertension and isolated systolic hypertension in the Sleep Heart Health Study.
abstract: BACKGROUND
  Sleep-disordered breathing (SDB) is associated with hypertension in the middle-aged. The association is less clear in older persons. Most middle-aged hypertensives have systolic/diastolic hypertension, whereas isolated systolic hypertension (ISH) is common among persons over 60 years. Mechanistically, only systolic/diastolic hypertension is expected to be associated with SDB, but few studies of SDB and hypertension distinguish systolic/diastolic hypertension from ISH. Prior investigations may have underestimated an association between SDB and systolic/diastolic hypertension in the elderly by categorizing individuals with ISH as simply hypertensive.
  
  
  RESULTS
  We conducted cross-sectional analyses of 6120 participants in the Sleep Heart Health Study, stratified by age: 40 to 59 (n=2477) and > or =60 years. Outcome measures included apnea-hypopnea index (AHI; average number of apneas plus hypopneas per hour of sleep), systolic/diastolic hypertension (> or =140 and > or =90 mm Hg), and ISH (> or =140 and <90 mm Hg). With adjustment for covariates, ISH was not associated with SDB in either age category. In those aged<60 years, AHI was significantly associated with higher odds of systolic/diastolic hypertension (AHI 15 to 29.9, OR=2.38 [95% CI 1.30 to 4.38]; AHI > or =30, OR=2.24 [95% CI 1.10 to 4.54]). Among those aged > or =60 years, no adjusted association between AHI and systolic/diastolic hypertension was found.
  
  
  CONCLUSIONS
  SDB is associated with systolic/diastolic hypertension in those aged <60 years. No association was found between SDB and systolic/diastolic hypertension in those aged > or =60 years or between SDB and ISH in either age category. These findings have implications for SDB screening and treatment. Distinguishing between hypertensive subtypes reveals a stronger association between SDB and hypertension for those aged <60 years than previously reported.
authors.affiliation: Mount Sinai School of Medicine, New York, NY, USA.
authors.forename: Donald C
authors.initials: DC
authors.lastname: Haas
authors.forename: Gregory L
authors.initials: GL
authors.lastname: Foster
authors.forename: F Javier
authors.initials: FJ
authors.lastname: Nieto
authors.forename: Susan
authors.initials: S
authors.lastname: Redline
authors.forename: Helaine E
authors.initials: HE
authors.lastname: Resnick
authors.forename: John A
authors.initials: JA
authors.lastname: Robbins
authors.forename: Terry
authors.initials: T
authors.lastname: Young
authors.forename: Thomas G
authors.initials: TG
authors.lastname: Pickering
mesh_terms: D000328:Adult; D000367:Age Factors; D000368:Aged; D000959:Antihypertensive Agents / Q000627:therapeutic use; D003430:Cross-Sectional Studies; D003971:Diastole; D005260:Female; D006801:Humans; D006973:Hypertension / Q000145:classification / Q000453:epidemiology* / Q000209:etiology; D008297:Male; D008875:Middle Aged; D012307:Risk Factors; D012891:Sleep Apnea Syndromes / Q000150:complications* / Q000175:diagnosis; D020182:Sleep Apnea, Central / Q000150:complications; D013599:Systole
chemical_list: D000959:Antihypertensive Agents