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Body mass index positively linked with blood pressure

Body mass index positively linked with blood pressure

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Body mass index is positively associated with blood pressure, according to the ongoing study of 1.7 million Chinese men and women being conducted by researchers at the Yale Center for Outcomes Research and Evaluation (CORE) and in China. These findings appear in the Aug. 17 issue of JAMA Network Open.

In individuals who were not taking an antihypertensive medication, the researchers observed an increase of 0.8 to 1.7 mm Hg (kg/m2) in blood pressure per additional unit of body mass index (BMI). Overall, the population had a mean BMI of 24.7 and a mean systolic blood pressure of 136.5, which qualifies as stage I hypertension according to American Heart Association guidelines.

Researchers recorded the participants’ blood pressure from September 2014 through June 2017 as part of the larger China Patient-Centered Evaluative Assessment of Cardiac Events (PEACE) Million Persons Project, which captures at least 22,000 subgroups of people based on age (35-80), sex, race/ethnicity, geography, occupation, and other pertinent characteristics — such as whether or not they are on antihypertensive medication.

“The enormous size of the dataset — the result of an unprecedented effort in China — allows us to characterize this relationship between BMI and blood pressure across tens of thousands of subgroups, which simply would not be possible in a smaller study,” explained George Linderman, first author and doctoral candidate at Yale.

In China, the frequency of obesity is expected to more than triple in men — from 4.0% in 2010 to 12.3% in 2025 — and more than double in women — from 5.2% to 10.8%. Meanwhile, high blood pressure already affects one-third of Chinese adults, and only about one in 20 of those with hypertension have the condition under control,

“If trends in overweight and obesity continue in China, the implication of our study is that hypertension, already a major risk factor, is likely to become even more important,” said Harlan Krumholz, M.D., the Harold H. Hines, Jr. Professor of Cardiology, director of CORE, and senior author on the study. “This paper is ringing the bell that the time is now to focus on these risk factors.”

According to the researchers, one way for the Chinese healthcare system to address these risk factors would be the management of high blood pressure with antihypertensive drugs.

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