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For many older Americans, only the systolic blood pressure is high, a condition known as "isolated systolic hypertension," or ISH (systolic at or above 140 mm Hg and diastolic under 90 mm Hg). Research finds that diastolic blood pressure rises until about age 55 and then declines, while systolic blood pressure increases steadily with age.
About 65% of all people with hypertension age 60 and older have ISH; this is the same group that has the poorest hypertension control rate.
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