Objectives: Elevated homocysteine increases the risk of vascular disease, in particular amongst younger subjects (< 60 years). Very few studies have been performed amongst older subjects. We evaluated the relation of plasma total homocysteine (tHcy) to atherosclerosis and symptomatic cardiovascular disease amongst older men and women.
Design: A cross-sectional study.
Setting: General population.
Subjects: A random sample of 630 men and women, participating in the Rotterdam Study, a prospective population-based cohort study amongst 7983 subjects aged 55 years and over residing in the Ommoord district of Rotterdam, the Netherlands.
Main outcome measures: Carotid atherosclerosis (carotid plaques and common carotid intima-media thickness) assessed by ultrasonography; lower extremity (peripheral) artery atherosclerosis measured by the ratio of the ankle to arm systolic blood pressure; prevalent cardiovascular disease assessed as a history of myocardial infarction or stroke.
Results: Subjects, 55-74 years of age, with elevated tHcy levels (+/- 18.6 mumol L-1) had a thicker common carotid intima-media (difference 0.037 mm; 95% CI 0.001, 0.073), a lower ankle-arm index (-0.054; -0.104, -0.004), and an increased risk of cardiovascular disease (odds ratio 3.0; 1.5, 6.1), after adjusting for sex and age. There was no appreciable association of tHcy levels to atherosclerosis and cardiovascular disease in subjects aged 75 years and older.
Conclusions: In subjects aged 55-74 years elevated tHcy is associated with an increased risk of atherosclerosis and cardiovascular disease. The lack of association in those aged > or = 75 years most probably reflect selective mortality.