![]() Normal-high blood pressure is defined as systolic blood pressure 130-139 mmHg and/or diastolic blood pressure 85-89 mmHg.Normal blood pressure is systolic blood pressure less than 130 mmHg and diastolic blood pressure less than 85 mmHg.We refer to optimal blood pressure if systolic blood pressure is below 120 mmHg and diastolic blood pressure is below 80 mmHg.Blood pressure normally changes throughout the day, but when either systolic or diastolic pressure stays constantly high it is called high blood pressure (hypertension). ![]() Systolic blood pressure (the top or higher number) is the pressure in the artery when the heart contracts and diastolic blood pressure (the bottom or lower number) is the pressure in the artery when the heart relaxes between beats. Blood pressure is most commonly measured in the brachial artery of the arm and it is expressed as two numbers. Blood pressure is the pressure or force of blood against the walls of blood vessels as it circulates. ![]()
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