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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.
Blood pressure measurements are written as a pair of numbers: The systolic pressure (the top number) is a measure of the pressure the blood exerts against the arterial walls when the heart contracts. The diastolic pressure (the bottom number) is the pressure between contractions.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.