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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.
Blood pressure can also be measured with a blood pressure machine. The two numbers that measure your blood pressure are written like a fraction: one number on top and one on the bottom. For example, what many people consider normal blood pressure is read as 120/80. The number on top is the systolic blood pressure. It measures the pressure inside your blood vessels at the moment your heart beats. The number on the bottom is your diastolic pressure, which measures the pressure in your blood vessels between heartbeats, when your heart is resting. Blood Pressure Information.