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Answers from Sheldon G. Sheps, M.D. Yes. If you have a diastolic number â the bottom number of a blood pressure measurement â less than 90 millimeters of mercury (mm Hg) and a systolic number â the top number of a blood pressure measurement â greater than 140 mm Hg, you have a common type of high blood pressure called isolated systolic hypertension.
For a normal reading, your blood pressure needs to show a top number (systolic pressure) thatâs between 90 and 120 and a bottom number (diastolic pressure) thatâs between 60 and 80. The American Heart Association (AHA) considers blood pressure to be within the normal range when both your systolic and diastolic numbers are in these ranges.