title: Severe sleep apnea and risk of ischemic stroke in the elderly.
abstract: OBJECTIVE
  Convincing evidence of a causal relationship between sleep apnea and stroke has been shown recently in several prospective, well-designed studies. However, these studies have focused on middle-aged people, excluding the elderly population from analysis. To investigate whether sleep apnea represents an independent risk factor in this population, we performed a prospective longitudinal study in a population-based cohort of subjects from 70 to 100 years old.
  
  
  METHODS
  Within the context of the Vitoria Sleep Project, a population-based study designed to investigate the prevalence of sleep apnea in the population of Vitoria, Spain, we performed a 6-year longitudinal study in a subsample cohort of 394 noninstitutionalized, initially event-free subjects (70 to 100 years old, median 77.28 years, 57.1% males). Demographic and polysomnographic data and known confounding factors (age, sex, smoking and alcohol consumption status, body mass index, systolic and diastolic blood pressure, total serum cholesterol levels, and the presence or absence of diabetes mellitus, atrial fibrillation, and hypertension) were assessed at baseline. Hazard ratio for developing an ischemic stroke in relation to the apnea-hypopnea index at baseline was calculated.
  
  
  RESULTS
  Over the 6-year follow-up period, 20 ischemic strokes were registered. After adjustment for confounding factors, subjects with severe obstructive sleep apnea hypopnea (defined as apnea-hypopnea index >or=30) at baseline had an increased risk of developing a stroke (hazard ratio=2.52, 95% CI=1.04 to 6.01, P=0.04).
  
  
  CONCLUSIONS
  This study shows that severe obstructive sleep apnea hypopnea (defined as apnea-hypopnea index >or=30) increases the risk of ischemic stroke in the elderly population, independent of known confounding factors.
authors.affiliation: Department of Neurology, Hospital de Navarra, Pamplona, Spain. robertoprovisional@hotmail.com
authors.forename: Roberto
authors.initials: R
authors.lastname: Munoz
authors.forename: Joaquín
authors.initials: J
authors.lastname: Duran-Cantolla
authors.forename: Eduardo
authors.initials: E
authors.lastname: Martínez-Vila
authors.forename: Jaime
authors.initials: J
authors.lastname: Gallego
authors.forename: Ramón
authors.initials: R
authors.lastname: Rubio
authors.forename: Felipe
authors.initials: F
authors.lastname: Aizpuru
authors.forename: Germán
authors.initials: G
authors.lastname: De La Torre
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D002545:Brain Ischemia / Q000209:etiology*; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D015994:Incidence; D008137:Longitudinal Studies; D008297:Male; D016016:Proportional Hazards Models; D011446:Prospective Studies; D018570:Risk Assessment; D012720:Severity of Illness Index; D012891:Sleep Apnea Syndromes / Q000150:complications* / Q000503:physiopathology*; D020521:Stroke / Q000453:epidemiology / Q000209:etiology*