Plasma homocyst(e)ine levels in men with premature coronary artery disease

U.S. Department of Agriculture, Human Nutrition Research Center on Aging, Tufts University, Boston, Massachusetts 02111.

Plasma homocyst(e)ine (that is, the sum of free and bound homocysteine and its oxidized forms, homocystine and homocysteine-cysteine mixed disulfide) levels were determined in 170 men (mean age +/- SD 50 +/- 7 years) with premature coronary artery disease diagnosed at coronary angiography and in 255 control subjects clinically free of coronary artery disease (mean age 49 +/- 6 years). Patients with coronary artery disease had a higher homocyst(e)ine level than control subjects (13.66 +/- 6.44 versus 10.93 +/- 4.92 nmol/ml, p less than 0.001). High density lipoprotein (HDL) cholesterol levels were lower (32 +/- 10 versus 46 +/- 13 mg/dl, p less than 0.001) and triglycerides levels were higher (193 +/- 103 versus 136 +/- 106 mg/dl, p less than 0.001) in the coronary disease group. Plasma total cholesterol and low density lipoprotein (LDL) cholesterol levels were not significantly different between patients with coronary disease and control subjects. The presence of hypertension, smoking or diabetes mellitus did not significantly alter homocyst(e)ine levels in the patient or the control group. Patients who were not taking a beta-adrenergic blocking drug (n = 70) had a nonsignificantly higher homocyst(e)ine level than did patients taking this class of drugs (n = 100) (14.67 +/- 8.92 versus 12.95 +/- 3.77 nmol/ml, p = 0.087). By design, none of the control subjects were taking a beta-blocker. No significant correlations were observed between homocyst(e)ine and age, serum cholesterol, LDL cholesterol, HDL cholesterol or triglyceride levels. It is concluded that an elevated plasma homocyst(e)ine level is an independent risk factor for the development of premature coronary atherosclerosis in men.

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