RISK FACTORS FOR HEART DISEASE IN WOMEN
Premenopausal women are unlikely candidates for heart attacks, except for those who suffer from diabetes, high blood pressure, or kidney disease, or who have a genetic predisposition to high cholesterol levels. Family history and smoking can also increase the risk for premenopausal women.
The Estrogen Element
Once her estrogen production drops with menopause, a woman’s chance of developing CVD rises rapidly. A 60-year-old woman has the same heart attack risk as a 50-year-old man. By her late 70s, a woman has the same heart attack risk as a man her age. To date, much of this changing risk has been attributed to the aging process, but some preliminary evidence indicates that hormones may play a bigger role than once thought. Recent results from the Postmenopausal Estrogen/Progestin Interventions (PEPI) study, a longitudinal study of how various hormone replacement therapies (HRTs) affect cardiovascular risks, indicate that HRT may reduce CVD by as much as 12 to 25 percent. In this study, HRT seemed to reduce a woman’s risk for CVD by raising HDL cholesterol levels and lowering LDL cholesterol levels. Even when their total blood cholesterol levels are higher than men’s, women may be at less risk because they typically have a higher percentage of HDL.
But that’s only part of the story. It’s true that women age 25 and over tend to have lower cholesterol levels than do men of the same age. But when they reach 45, things change. Most men’s cholesterol levels become more stable, while both LDL and total cholesterol levels in women start to rise. And the gap widens further beyond age 55.
Before age 45, women’s total blood cholesterol levels average below 220 mg/dl. By the time she is 45 to 55, the average woman’s blood cholesterol rises to between 223 and 246 mg/dl. Studies of men have shown that for every 1 percent drop in cholesterol, there is a 2 percent decrease in CVD risk. If this holds true for women, prevention efforts focusing on dietary interventions and exercise may significantly help postmenopausal women.
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