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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.
DEAR READER: A blood pressure measurement includes two numbers: systolic pressure (the upper number) and diastolic pressure (the lower number). These numbers are measured in millimeters of mercury, or mmHg. Your systolic pressure is high: 140 mmHg or over is high. And your lower number is normal: normal diastolic pressure is below 80 mmHg. When your systolic blood pressure is high and your diastolic blood pressure is low, itâs called isolated systolic hypertension (ISH). People with ISH do benefit from treatment, as it lowers the risk of heart disease and stroke.