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Posted: November 25, 2008

Reduced US Heart Disease Risk Overstated; Women Especially Affected

The 30-year trend of reducing the risk of heart disease in the United States may have been overstated, and, in fact, the trend has flattened in recent years, according to a new analysis of national data by the Mayo Clinic.

This conclusion suggests that the public health challenge of curbing heart disease may be greater than is commonly thought, says Dr. Francisco Lopez-Jimenez, cardiologist and lead researcher at the Mayo Clinic.

 

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“This study may surprise people because the data show that the risk of heart disease is not going down as we expected,” he says. “The estimated risk in our nation was coming down nicely in the 1980s. Then around 2000 it began changing -- the trend lines flattened. While we had done a nice job with lowering cholesterol, blood pressure and stopping smoking, over time the improvement in these risk factors slowed and others like diabetes and obesity emerged, threatening to undo the early progress we made in reducing risk of heart disease. Most of the gains in reducing heart disease risk have been offset by the increased prevalence of diabetes and obesity.”

 

Lopez-Jimenez presented the findings at the American Heart Association’s Scientific Sessions meeting in New Orleans.

 

The study is the first to suggest that not as much progress against heart disease has been made in recent years, despite the efforts by many organizations to promote healthy lifestyles, and the wide availability and lower price of many cholesterol and blood pressure-lowering drugs.

 

“This is highly relevant to public health because most people think the risk of heart disease is going down steadily and has for the past 30 to 40 years, but our data show something different,” Lopez-Jimenez says. “The fact is that despite all the wonderful things we’ve done -- all the changes in fat consumption, the promotion of exercise, the quitting smoking, treatment of high cholesterol and blood pressure -- it doesn’t appear to be enough; the risk reduction we did achieve early on in the 1980s has gone flat, and we need to change that.”

 

The researchers compared national heart disease risk factor data from three time periods to track change over time in risk reduction. The early period documented changes in risk between 1976 and 1980 and a midpoint of 1988 to 1994. The last period documented changes in risk from the midpoint to 1999-2004. Comparing changes from the early stage to the midpoint documented a decline in the overall risk to develop heart disease; but comparing change from the midpoint to the late period showed the trend flattening.

 

“No one has ever compared national data this way, which is why we are the first to detect this worrisome flattening of the trend in risk factor reduction,” Lopez-Jimenez says.

 

The data show that, in the United States, the average age-adjusted 10-year risk of heart disease:

For women, in particular, the age-adjusted risk declined from the early period to the midpoint, but stayed flat from the midpoint to the late period, Lopez-Jimenez says. Similarly, when age groups were compared, the average predicted risk for those ages 30 to 49 stayed flat from the midpoint to the late period, compared to people age 50 and above.

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