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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.
The top number refers to the amount of pressure in your arteries during contraction of your heart muscle; this is called âsystolicâ pressure. The bottom number refers to your blood pressure when your heart muscle is between beats; this is called âdiastolicâ pressure.or a normal reading, your blood pressure needs to show a top number thatâs lower than 120, and a bottom number thatâs lower than 80. When both your systolic and diastolic numbers are in these ranges, then you are considered by the American Heart Association (AHA) to be within the normal range for blood pressure.