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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.
Let me explain in general terms what the blood pressure numbers mean: top number (the systolic blood pressure) is the pressure the heart has to overcome to open the valves to pump blood out. Bottom number (the diastolic blood pressure) is the pressure between beats when the heart is resting.lood pressure is the pressure inside the arteries (blood vessels). It is measured in two numbers, such as 110/70 (110 over 70). Adults 18 years and older: 1  The first or top number (systolic pressure) is the highest pressure in the arteries when the heart pumps blood into them.