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Age, blood pressure, and retinal vessel diameter: separate effects and interaction of blood pressure and age.

Abstract：

PURPOSE:The association of age and blood pressure (BP) with retinal vessel change is widely reported, with inverse relationships between retinal arteriolar and venular diameter and increasing age and elevated BP. No previous studies have dissected the separate effects of age and BP on the diameter of retinal vessels. METHODS:This was a population-based, cross-sectional study comprising 3654 participants (82.4% response) aged 49+ years from the Blue Mountains region of Australia. Retinal arteriolar and venular diameters were measured from digital retinal images, using a standardized method, and were summarized as central retinal arteriolar (CRAE) and central retinal venular (CRVE) equivalents. RESULTS:After adjustment for venular diameter, regression plots, and regression coefficients from linear models demonstrated an inverse relationship between arteriolar diameters and mean arterial BP (MABP) in all age groups-greatest in the <60 age group and progressively diminishing thereafter. Increasing age was associated with greater arteriolar narrowing (of lesser magnitude), in each MABP category (<100, 100-109, 109-129, and >120 mm Hg) with the greatest effect in persons with MABP <100. There was evidence of interaction between age and blood pressure in their effects on arteriolar diameter (P = 0.003). After adjustment for arteriolar diameter, age was inversely associated with venular diameter (the effect was progressively greater for persons with progressively higher MABP), and MABP was positively associated with venular diameter in subjects aged <80 years (interaction P = 0.05). CONCLUSIONS:These findings demonstrate the importance of elevated blood pressure in arteriolar narrowing, especially in those younger than 60 years and show that venules tend to widen rather than narrow with increasing blood pressure levels.

journal_name

Invest Ophthalmol Vis Sci

journal_title

Investigative ophthalmology & visual science

authors

Kaushik S,Kifley A,Mitchell P,Wang JJ

doi

10.1167/iovs.06-0893

subject

Has Abstract

pub_date

2007-02-01 00:00:00

pages

557-61

issue

eissn

0146-0404

issn

1552-5783

pii

48/2/557

journal_volume

pub_type

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Age, blood pressure, and retinal vessel diameter: separate effects and interaction of blood pressure and age.