Development of fatty plaque is due partly to excessive intake of cholesterol and animal fats in the diet (see Nutrition, Human). A sedentary life-style is thought to promote atherosclerosis, and evidence suggests that physical exercise may help prevent heart disease (see Physical Fitness). A striving, perfectionist temperament referred to as Type A personality has also been associated with increased risk of heart attacks (see Stress-Related Disorders), as has cigarette smoking. The occurrence of the heart …showed first 75 words of 262 total…

…showed last 75 words of 262 total…In this procedure, which became established in the 1970s, a section of vein from the leg is sewn into the blocked coronary artery to form a bridge around the atherosclerotic region. In most recipients the operation relieves the pain of angina and in many persons it prevents a fatal heart attack. By 1986 more than 225,000 patients were undergoing these procedures each year in the U.S. "Heart," Microsoft® Encarta® Encyclopedia 99. © 1993-1998 Microsoft Corporation. All rights reserved.