Framingham Study: Aortic Stiffness in Women Begins Decades Before Menopause, Challenging Long-Held Beliefs

New research published in Hypertension, a peer-reviewed journal of the American Heart Association, indicates that the midlife increase in aortic stiffness and pulse pressure in women is not primarily driven by menopause. The study, part of the long-running Framingham Heart Study, found that pulse pressure—the difference between systolic and diastolic blood pressure readings—begins to rise about two decades before a woman's final menstrual period. This challenges the conventional belief that falling estrogen levels during menopause are the main culprit.

According to the study, pulse pressure reached its lowest point and began to rise in women in their late 30s, compared to late 40s in men. The age at menopause, whether early, late, or average, had no influence on when this transition occurred. After midlife, pulse pressure increased faster in women, leading to higher average pulse pressure in women than men after age 60. The aorta, the body's largest blood vessel, stiffens over time, and a wider pulse pressure indicates the heart is working harder and may damage small vessels in organs like the brain and kidneys.

Senior author Gary F. Mitchell, M.D., of the Framingham Heart Study and president of Cardiovascular Engineering, Inc., said, "To our huge surprise, our results suggest that factors other than the timing of the final menstrual period were likely involved in the accelerated increase in pulse pressure in women after midlife." He emphasized that healthcare professionals should consider pulse pressure in middle-aged and older patients, especially women with high blood pressure. "Women and their doctors should sound the alarm if pulse pressure is higher than 60 mm Hg and track it over time," Mitchell said. Wide pulse pressure is an independent risk factor for cardiovascular disease, dementia, and kidney disease, and may make high blood pressure less responsive to standard treatments.

The study analyzed data from 6,760 women and 3,248 men in the Framingham Heart Study, a community-based study that has followed three generations of families. Limitations include the observational design, reliance on self-reported menopause age, and a predominantly white European descent sample. Samar R. El Khoudary, Ph.D., M.P.H., FAHA, who was not involved in the study, noted, "We shouldn't wait until menopause to start thinking about cardiovascular health. By the time a woman reaches her final menstrual period, vascular changes may already have been underway for years."

This research has significant implications for clinical practice. Pulse pressure is not currently included in blood pressure management guidelines, but the findings suggest it should be. Tailored treatment approaches may be necessary because high blood pressure with wide pulse pressure often responds poorly to usual therapies. The study adds to the growing body of evidence that vascular aging begins earlier than previously thought, offering a window for early intervention. For more information, see the American Heart Association journal Hypertension and the Framingham Heart Study.