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Diastolic blood pressure measures the pressure in your blood vessels between heartbeats, when your heart is resting. It is represented by the bottom number in a blood pressure reading. Systolic blood pressure measures the amount of pressure that blood exerts on vessels while the heart is beating.
The diastolic pressure is the pressure of the blood between heartbeats. The numbers are usually written as a fraction with the systolic above or to the left. An example is 120/80 mm Hg (millimeters of mercury), a normal adult blood pressure. Both numbers count. Your blood pressure is high if the systolic pressure is 140 or above, or the diastolic pressure is 90 or above, or both are high.