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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.
For example, 110 over 70 (written as 110/70). 1  The top number is the systolic blood pressure reading. It represents the maximum pressure exerted when the heart contracts. 2  The bottom number is the diastolic blood pressure reading. It represents the minimum pressure in the arteries when the heart is at rest.