Nearly half of American adults are at risk for major health problems because of high blood pressure, according to a new scientific guideline that redefines the dangerous condition and provides tactics for doctors to detect, treat and prevent it.

People with readings of 130 as the top number or 80 as the bottom one now are considered to have high blood pressure, according to the guideline released by the American Heart Association. High blood pressure used to be defined as 140/90.
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