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CMAJ
CMAJ - May 18, 1999JAMC - le May 18, 1999

Impact of treating hyperlipidemia or hypertension to reduce the risk of death from coronary artery disease

Sylvie Perreault,* PhD; Marc Dorais,* MSc; Louis Coupal,* MSc; Gilles Paradis,†¶ MD, MSc; Michel R. Joffres,‡ MD, PhD; Steven A. Grover,*§¶ MD, MPA

CMAJ 1999;160:1449-55

From *the Centre for the Analysis of Cost-Effective Care and the Divisions of *Clinical Epidemiology and †Preventive Medicine, Montreal General Hospital, Montreal, Que.; ‡the Department of Epidemiology and Community Health, Dalhousie University, Halifax, NS; and the Departments of §Medicine and ¶Epidemiology and Biostatistics, McGill University, Montreal, Que.

This article has been peer reviewed.

Reprint requests to: Dr. Steven A. Grover, Centre for the Analysis of Cost-Effective Care, Montreal General Hospital, 1650 Cedar Ave., Montreal QC H3G 1A4

© 1999 Canadian Medical Association (abstract)

Abstract

Objective: To compare the prevalence of modifiable risk factors for cardiovascular disease among hypertensive and nonhypertensive adults and to estimate the effect of treating hyperlipidemia or hypertension to reduce the risk of death from coronary artery disease.

Methods: The authors evaluated a sample of 7814 subjects aged 35­74 years free of clinical cardiovascular disease from the Canadian Heart Health Surveys to estimate the prevalence of cardiovascular risk factors. They identified hyperlipidemic subjects (ratio of total cholesterol to high-density lipoprotein cholesterol [total-C/HDL-C] 6.0 or more for men and 5.0 or more for women) and hypertensive subjects (systolic or diastolic blood pressure 160/90 mm Hg or greater, or receiving pharmacologic or nonpharmacologic treatment). A life expectancy model was used to estimate the rate of death from coronary artery disease following specific treatments.

Results: An elevated total-C/HDL-C ratio was significantly more common among hypertensive than nonhypertensive men aged 35­64 (rate ratio [RR] 1.56 for age 35­54, 1.28 for age 55­64) and among hypertensive than nonhypertensive women of all ages (RR 2.73 for age 35­54, 1.58 for age 55­64, 1.31 for age 65­74). Obesity and a sedentary lifestyle were also more common among hypertensive than among nonhypertensive subjects. According to the model, more deaths from coronary artery disease could be prevented among subjects with treated but uncontrolled hypertension by modifying lipids rather than by further reducing blood pressure for men aged 35­54 (reduction of 50 v. 29 deaths per 100 000) and 55­64 (reduction of 171 v. 104 deaths per 100 000) and for women aged 35­54 (reduction of 44 v. 39 deaths per 100 000). Starting antihypertensive therapy in subjects aged 35­74 with untreated hypertension would achieve a greater net reduction in deaths from coronary artery disease than would lipid lowering. Nonetheless, the benefits of lipid therapy were substantial: lipid intervention among hypertensive subjects aged 35­74 represented 36% of the total benefits of treating hyperlipidemia in the total hyperlipidemic population.

Interpretation: The clustering of hyperlipidemia and the potential benefits of treatment among hypertensive adults demonstrate the need for screening and treating other cardiovascular risk factors beyond simply controlling blood pressure.

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