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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.
Your blood pressure consists of two numbers: The top or higher number is called the systolic number (pressure in vessels when your heart is beating), and the bottom or lower number is your diastolic number (pressure in your vessels when your heart is at rest). Here are the numbers you need to know: Optimal blood pressure: 115/75