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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.
Here's a quick guide to your heart-health numbers: 1. Blood Pressure: Key to Heart Health. Your doctor tells you your blood pressure numbers, or you hear the doctors on ER shout pressure's dropping! Do you actually know what that means? Blood pressure consists of two numbers. Your systolic pressure measures the pressure of blood against artery walls when the heart pumps blood out during a heartbeat, while the diastolic pressure measures the same pressure between heartbeats, when the heart fills with blood. Both of these numbers are important, says Mosca. Just because one is normal doesn't mean you're off the hook. Normal blood pressure is below 120/80. Pre-hypertension is 120 to 139 (systolic) and/or 80 to 89 (diastolic ...