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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.
Your blood pressure numbers and what they mean. Your blood pressure is recorded as two numbers: Systolic blood pressure (the upper number) â indicates how much pressure your blood is exerting against your artery walls when the heart beats. Diastolic blood pressure (the lower number) â indicates how much pressure your blood is exerting against your artery walls while the heart is resting between beats.