輕微的高血壓都會增加中風的危險~

Hypertension is defined as having systolic blood pressure of at least 140 millimeters of mercury (mm Hg) and diastolic blood pressure of at least 90 mm Hg. (Systolic and diastolic are the top and bottom numbers, respectively, in a blood-pressure reading.)

People with systolic pressure between 120 and 139 mm Hg or diastolic pressure between 80 and 89 mm Hg are said to have prehypertension. An estimated 31% of adults in the United States fall into this category, according to the study, which was published this week in the journal Neurology.

The increased risk of stroke was considerably larger in the upper half of the prehypertension range. Compared with people with normal blood pressure, those with systolic pressure between 130 and 139 or diastolic pressure between 85 and 89 were 79% more likely to experience a stroke, while those in the lower half of the range were just 22% more likely.

Moreover, the link between prehypertension and stroke applied only to adults under the age of 65. When the researchers included seniors in their analysis, the overall risk of stroke associated with prehypertension dropped to 55%.