Heart disease and stroke are the leading causes of death worldwide. In the United States, more than 600,000 people die of heart disease every year. According to the Centers for Disease Control and Prevention (CDC), nearly one-quarter of deaths due to cardiovascular disease are preventable.

Blood pressure readings are critical for analyzing and monitoring blood pressure. These tests record blood pressure using two measurements: systolic and diastolic blood pressure. Understanding these numbers is key to controlling blood pressure.

The systolic pressure shows how much pressure the blood places on the arteries when the heart beats, while the diastolic blood pressure shows the pressure while the heart is resting between beats. The American Heart Association (AHA) advise that blood pressure numbers below 120/80 millimeters of mercury (mm Hg) are normal.

When readings range from 120–129 mm Hg systolic and less than 80 mm Hg diastolic, the person has elevated blood pressure. Hypertension occurs when blood pressure is consistently over 130 mm Hg systolic or more than 80 mm Hg diastolic.

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