Prospective cohort study of retinal vessel diameters and risk of hypertension.
OBJECTIVE
To examine the relation between diameters of the retinal arterioles and 10 year incidence of hypertension.


METHODS
Population based prospective cohort study.


METHODS
Beaver Dam eye study.


METHODS
2451 normotensive people aged 43 to 84 years.


METHODS
Diameters of retinal arterioles and venules measured from digitised photographs of the retina taken at baseline. Measurements summarised as the arteriole:venule ratio, with a lower ratio indicating smaller arteriolar diameters. Incident hypertension, defined as systolic blood pressure > or =140 mm Hg, diastolic blood pressure > or =90 mm Hg, or use of antihypertensive drugs during follow up.


RESULTS
721 participants developed hypertension over a 10 year period. Those with lower arteriole:venule ratio had a higher cumulative incidence of hypertension (incidences of 17.4%, 24.1%, 31.0%, and 45.1%, respectively, for decreasing quarters of distribution of arteriole:venule ratio). After adjustment for age and sex, participants with arteriole:venule ratios in the lowest quarter had a threefold higher risk of hypertension (odds ratio 2.95, 95% confidence interval 2.77 to 3.88) than those with ratios in the highest quarter. This association remained significant after further adjustment for baseline systolic and diastolic blood pressure and other risk factors (1.82, 1.39 to 2.40, for lowest versus highest ratio quarters).


CONCLUSIONS
Narrowed retinal arterioles are associated with long term risk of hypertension, suggesting that structural alterations of the microvasculature may be linked to the development of hypertension.
Wong
Tien Yin
TY
Centre for Eye Research Australia, University of Melbourne, Victoria 3002, Australia. twong@unimelb.edu.au
Shankar
Anoop
A
Klein
Ronald
R
Klein
Barbara E K
BE
Hubbard
Larry D
LD
D000328:Adult; D000368:Aged; D001160:Arterioles / Q000473:pathology; D015331:Cohort Studies; D005260:Female; D006801:Humans; D006973:Hypertension / Q000209:etiology / Q000473:pathology*; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D012171:Retinal Vessels / Q000473:pathology*; D012307:Risk Factors; D014699:Venules / Q000473:pathology