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  Vol. 268 No. 7, August 19, 1992 TABLE OF CONTENTS
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A Prospective Study of Plasma Homocyst(e)ine and Risk of Myocardial Infarction in US Physicians

Meir J. Stampfer, MD; M. Rene Malinow, MD; Walter C. Willett, MD; Laura M. Newcomer; Barbara Upson; Daniel Ullmann, MPH; Peter V. Tishler, MD; Charles H. Hennekens, MD

JAMA. 1992;268(7):877-881.


Abstract

Objective.
—To assess prospectively the risk of coronary heart disease associated with elevated plasma levels of homocyst(e)ine.

Design.
—Nested case-control study using prospectively collected blood samples.

Setting.
—Participants in the Physicians' Health Study.

Participants.
—A total of 14916 male physicians, aged 40 to 84 years, with no prior myocardial infarction (Ml) or stroke provided plasma samples at baseline and were followed up for 5 years. Samples from 271 men who subsequently developed Ml were analyzed for homocyst(e)ine levels together with paired controls, matched by age and smoking.

Main Outcome Measure.
—Acute Ml or death due to coronary disease.

Results.
—Levels of homocyst(e)ine were higher in cases than in controls (11.1±4.0 [SD] vs 10.5±2.8 nmol/mL; P=.03). The difference was attributable to an excess of high values among men who later had MIs. The relative risk for the highest 5% vs the bottom 90% of homocyst(e)ine levels was 3.1 (95% confidence interval, 1.4 to 6.9; P=.005). After additional adjustment for diabetes, hypertension, aspirin assignment, Quetelet's Index, and total/high-density lipoprotein cholesterol, this relative risk was 3.4 (95% confidence interval, 1.3 to 8.8) (P=.01). Thirteen controls and 31 cases (11%) had values above the 95th percentile of the controls.

Conclusions.
—Moderately high levels of plasma homocyst(e)ine are associated with subsequent risk of Ml independent of other coronary risk factors. Because high levels can often be easily treated with vitamin supplements, homocyst(e)ine may be an independent, modifiable risk factor.

(JAMA. 1992;268:877-881)



Author Affiliations

From The Channing Laboratory, Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, Mass (Drs Stampfer, Willett, Tishler, and Hennekens and Ms Newcomer); Departments of Epidemiology (Drs Stampfer and Willett) and Nutrition (Dr Willett), Harvard School of Public Health, Boston, Mass; Oregon Regional Primate Research Center, Beaverton (Dr Malinow and Ms Upson); Departments of Medicine (Dr Malinow and Mr Ullmann) and Community and Preventive Medicine (Mr Ullmann), Oregon Health Sciences University, Portland; Brockton/West Roxbury Veterans Affairs Medical Center, Brockton, Mass (Dr Tishler); and Department of Preventive Medicine, Harvard Medical School, Boston, Mass (Dr Hennekens).


Footnotes

Presented in part at the 57th Meeting of the European Arteriosclerosis Society in Lisbon, Portugal, May 25, 1991.

Reprint requests to The Channing Laboratory, 180 Longwood Ave, Boston, MA 02115 (Dr Stampfer).



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