July 17, 2008 Prehypertension during young adulthood is common and is associated with subsequent coronary atherosclerosis, according to a study published in today's issue of Annals of Internal Medicine.
Researchers from the University of California, San Francisco, analyzed blood pressure measurements of 3,560 adults aged 18 to 30 from seven examinations over the course of 20 years. Nearly 20 percent (635) of the study participants developed prehypertension (systolic blood pressure 120 to 139 mmHg or diastolic blood pressure 80 to 89 mmHg) before the age of 35.
Although these blood pressure levels are below the cutoff for hypertension, the young adults with prehypertension were more likely than those with lower blood pressure to have calcium in their coronary arteries later in life. Coronary calcium is a marker of atherosclerosis and a predictor of future heart attacks and strokes.
"Our findings suggest the possibility that prehypertension itself is harmful, and not just because it is associated with subsequent hypertension," said Mark J. Pletcher, MD, MPH, the study's lead author. "People with a lot of calcium in their coronary arteries are more likely to have heart attacks and strokes, and these outcomes might be avoidable by keeping blood pressure low when you're young."
Dr. Pletcher notes, however, that the study only shows an association between prehypertension in young adults and coronary calcium later in life, and that blood pressure medications have not been proven to prevent cardiovascular disease in young adults with prehypertension.
Prehypertension was most common in young adults who were black, male, overweight, and of low socioeconomic status. Participants with low annual income (less than $25,000) and no college education were about twice as likely to have had early prehypertension as were participants with postgraduate education and an annual income greater than $100,000. Prehypertension before the age of 35 also was associated with having diabetes, low HDL cholesterol levels, and higher exposure to blood pressure elevation later in life.
Systolic prehypertension appeared to be more important than diastolic prehypertension, and the association was graded: the higher and the longer exposure to prehypertension during young adulthood, the higher the likelihood of having coronary calcium later in life.
The authors believe that their findings support existing recommendations to optimize blood pressure early in adulthood with lifestyle modifications such as regular physical activity, healthy eating, and weight control with the goal of lowering blood pressure to less than 120/80 mmHg and preventing progression to hypertension.
Although coronary calcium is a strong predictor of future coronary heart disease, the editors of Annals of Internal Medicine caution that not all patients with coronary artery calcium go on to develop cardiovascular disease.
The study participants were recruited for the Coronary Artery Risk Development in Young Adults (CARDIA) Study in 1985 through 1986. Only participants who had not developed clinical hypertension before age 35 were included in the analysis. The CARDIA Study is supported by the National Heart, Lung, and Blood Institute.
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