![]() While both numbers are important, the American Heart Association notes the top number usually gets more attention. This is the pressure measured between your heartbeats when your heart is relaxing. The “80” is the bottom number and is known as diastolic blood pressure. It represents the pressure in your arteries when your heart beats. The “120” is the top number and is known as systolic blood pressure. Use 120 over 80, which is written as 120/80 mm Hg (millimeters of mercury), as an example. Blood pressure is always shown as two numbers.
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