Primary Prevention and Health Services Delivery

Abstract

Stroke remains the third leading cause of death in the US and other Western countries,1 and at least 1 population-based study found that the incidence of stroke was greater than that of acute coronary syndromes.2 Although there have been substantial falls in stroke incidence in some countries over the last 2 decades,3 a large US study found that the advances in stroke prevention during the 1990s were not associated with decreases in the rate of stroke hospitalizations or in case-fatality rates between 1993 and 1999.4 Moreover, based solely on demographic changes in the population of selected countries within the European Union, the World Health Organization predicts a 27% increase in stroke events between the years 2000 and 2025.5 The proportion of deaths attributed to stroke is even higher in Asian countries.6 Although much of stroke risk may be related to socioeconomic factors, more effective prevention strategies are critical. Several studies have contributed to the body of knowledge related to primary stroke prevention over the last year. Numerous studies support an association between elevated homocysteine levels and atherosclerotic disease.7 The B vitamins (folic acid, B12, and B6) reduce homocysteine serum levels raising the hope that treatment would be associated with reduced risk. That hope was diminished with publication of results of the Vitamin Intervention for Stroke Prevention (VISP) trial in 2004.8 Although a secondary rather than a primary stroke prevention trial, VISP had compared high- and low-dose B-vitamin supplementation and found no treatment effect on the risk of recurrent stroke (risk ratio [RR] 1.0; 95% CI, 0.8 to 1.3), or in the combined risk of any stroke, coronary heart event, or death (RR, 1.0; 95% CI, 0.8 to 1.1). The difference in homocysteine levels between treatment groups, however, was small …