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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.
1 The top number is your systolic blood pressure. 2  The bottom number is your diastolic blood pressure. 3  For instance, a systolic pressure of 130 and a diastolic pressure of 75 is written as 130/75 and read as 130 over 75.he top number, or systolic pressure, is the measurement of the pressure of the blood in your arteries when your heart contracts, or beats, and is forcing blood out to the rest of your body.