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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.
The bottom number (diastolic) is the pressure in your arteries when the heart is relaxed. That is why there is more concern when the diastolic is a high number than when the systolic (top number) is high. If your bottom number is high, your heart is never getting the relaxation pressures it needs.