title: Is prehypertension a risk factor for cardiovascular diseases?
abstract: OBJECTIVE
  The Joint National Committee on High Blood Pressure identified a new category of blood pressure in adults termed prehypertension. Our objective was to determine the long-term risk of cardiovascular diseases associated with this new category in a well-defined cohort of adults.
  
  
  METHODS
  We evaluated the association of prehypertension (120 to 139/80 to 89 mm Hg) and hypertension (>140/90 mm Hg) with the incidence of atherothrombotic brain infarction (ABI), all strokes, myocardial infarction (MI), and coronary artery disease (CAD) using pooled repeated measures and Cox proportional hazards analyses during follow-up after adjusting for age, gender, obesity, diabetes mellitus, hypercholesterolemia, cigarette smoking, and study period in a cohort of 5181 persons who participated in the Framingham Study.
  
  
  RESULTS
  Among the 11,116 person observations with a mean follow-up period of 9.9+/-1.0 years, prehypertension was not associated with an increased risk for ABI (relative risk [RR], 2.2; 95% CI, 0.5 to 9.3). Among the 11,802 person observations with a mean follow-up period of 9.7+/-1.5 years, prehypertension was associated with an increased risk for MI (RR, 3.5; 95% CI, 1.6 to 7.5). Prehypertension was also associated with an increased risk of CADs among the 11,570 person observations (RR, 1.7; 95% CI, 1.2 to 2.4).
  
  
  CONCLUSIONS
  Prehypertension appears to be associated with an increased risk of MI and CAD but not stroke. Further studies are required to confirm the anticipated benefits of identifying and intervening in persons with prehypertension.
authors.affiliation: Zeenat Qureshi Stroke Research Center, Department of Neurology and Neurosciences, University of Medicine and Dentistry of New Jersey, Newark, USA. aiqureshi@hotmail.com
authors.forename: Adnan I
authors.initials: AI
authors.lastname: Qureshi
authors.forename: M Fareed K
authors.initials: MF
authors.lastname: Suri
authors.forename: Jawad F
authors.initials: JF
authors.lastname: Kirmani
authors.forename: Afshin A
authors.initials: AA
authors.lastname: Divani
authors.forename: Yousef
authors.initials: Y
authors.lastname: Mohammad
mesh_terms: D000328:Adult; D000368:Aged; D001794:Blood Pressure; D002318:Cardiovascular Diseases / Q000209:etiology* / Q000473:pathology; D015331:Cohort Studies; D003324:Coronary Artery Disease / Q000175:diagnosis / Q000473:pathology; D018572:Disease-Free Survival; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D006973:Hypertension / Q000175:diagnosis* / Q000473:pathology*; D015994:Incidence; D008297:Male; D008875:Middle Aged; D009203:Myocardial Infarction / Q000175:diagnosis / Q000473:pathology; D016016:Proportional Hazards Models; D012306:Risk; D012307:Risk Factors; D012907:Smoking; D020521:Stroke / Q000473:pathology; D013997:Time Factors; D016896:Treatment Outcome