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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.
When blood pressure is measured, we commonly record the pressure as two numbers, one above the other, like a fraction. The difference between a fraction and a blood pressure is that the top number of a blood pressure is always higher than the bottom number (example: 120/80). The top number is the systolic blood pressure.