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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 number indicates pressure when the heart is at rest. Diastolic readings are the bottom half of the blood pressure reading. If the diastolic number is high and closely matches a systolic number in the hundreds (e.g. 130/120), this indicates stage two high blood pressure. Stage two high blood pressure requires immediate attention as it presents a high risk of cardiac incident, blood vessel rupture or damage to the kidneys.