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A computer based decision support system and risk chart did not reduce cardiovascular risk or blood pressure in hypertension
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 Question In patients with hypertension, do a computer based clinical decision support system (CDSS) and a cardiovascular risk chart help to reduce absolute cardiovascular risk and blood pressure?

Design

Cluster randomised (allocation concealed*), unblinded,* controlled trial with 1 year follow up.

Setting

27 general practices in Avon, UK.

Patients

614 patients who were 60–80 years of age (mean age 71 y, 54% women), had a diagnosis of hypertension, and were prescribed antihypertensive drugs in the previous year. Follow up was 86% at 1 year.

Intervention

General practices were allocated to a CDSS plus a risk chart (10 practices, 229 patients); a risk chart only (10 practices, 228 patients); or usual care (7 practices, 157 patients). The CDSS required patient information to …

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