OBJECTIVE: To determine in primary care patients at high risk for a cardiovascular event, the effects on biomedical risk factors for and incidence of cardiovascular events, of a brief cardiovascular prevention program executed by a health advisor. METHOD: DESIGN: Cluster randomized controlled trial with 1,275 patients (24 general practices) in and around Maastricht, the Netherlands (1999 to 2004). INTERVENTION: Health advisors were to complete computerized cardiovascular risk profiles, provide multi-factorial tailored health education and advice, and communicate with GP's to optimize treatment. OUTCOME: Differences in changes in risk factors between baseline and follow up at 6, 18, and 36 months and incidence of cardiovascular events at 36 months. RESULTS: Process: Because of logistic reasons risk profiles were put on paper instead of in the computerized patient files. On average patients attended 2.3 counseling sessions. Interaction with GPs was less productive than expected. Outcome: Effect after six months on BMI (-0.20 kg/m2 (95% CI -0.38 to -0.01, p = 0.039), Cohen's d -0.18), and after 18 months on HDL-cholesterol (+0.05 mmol/l (95% CI +0.01 to +0.09, p = 0.014), Cohen's d 0.14). No other (subgroup) effects were found. CONCLUSION: Given the lack of clinically meaningful effects, implementation of this intervention in its present form is not justified.
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