Is oxidative stress causally linked to unstable angina pectoris? A study in 100 CAD patients and matched controls

Cardiovascular Research
K KostnerK Huber

Abstract

Unstable angina pectoris often leads to acute myocardial infarction. Since lipid peroxidation is thought to be causally related to chronic and acute events in atherosclerosis and coronary artery disease, we measured lipid peroxidation products and vitamin E in 100 patients with coronary artery disease and compared them to a matched control group. 50 consecutive patients with stable angina pectoris (SAP) and 50 consecutive patients with unstable angina pectoris (UAP) were studied and compared to 100 clinically healthy individuals. In addition to conventional lipid and lipoprotein analysis, malondialdehydes were measured as thiobarbituric acid reactive substances (TBARS). Lipid hydroperoxides were assayed with the colorimetric methylene blue method. alpha-Tocopherol was quantitated by HPLC after extraction of serum with hexane-ethanol. In the patient group conjugated dienes were also measured. As expected, patients had significantly higher cholesterol, triglyceride LDL-C and Lp(a) values and lower HDL-C values than controls. When patients were divided into groups with SAP and UAP respectively, peroxides and TBARS were significantly higher in the latter group as compared to patients with SAP and to controls. Conjugated dienes were...Continue Reading

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