Differences between Diastolica-Sistolica-Presion-Arterial

Systolic vs. diastolic pressure

Systolic and diastolic pressure are the two measurements used to determine blood pressure. Blood pressure is recorded as two numbers, written as a ratio, such as 120/80 mmHg. The first number is the systolic pressure, and the second is the diastolic pressure. Both are measured in millimeters of mercury (mmHg).

Systolic pressure measures the force exerted on the walls of the arteries when the heart beats or contracts to pump blood to the rest of the body. Diastolic pressure measures the pressure in the arteries when the heart is at rest between beats, refilling with blood. While both numbers are components of a blood pressure reading, they reflect pressure during different phases of the cardiac cycle.

Comparison Table

Category	Systolic Pressure	Diastolic Pressure
Definition	The pressure in the arteries during the heart's contraction (systole).	The pressure in the arteries during the heart's relaxation and filling phase (diastole).
Position in Reading	The top or first number.	The bottom or second number.
Cardiac Action	Heart is actively pumping blood out to the body.	Heart is resting and refilling with blood between beats.
Relative Value	The higher of the two numbers.	The lower of the two numbers.
Normal Range (Adults)	Less than 120 mmHg.	Less than 80 mmHg.

Venn diagram comparing Differences between Diastolica-Sistolica-Presion-Arterial

Clinical Significance

Both systolic and diastolic readings are used to diagnose and manage hypertension (high blood pressure). According to the American Heart Association, hypertension in adults is defined as a systolic pressure of 130 mmHg or higher, or a diastolic pressure of 80 mmHg or higher, that remains consistent over time.

Historically, greater emphasis was often placed on diastolic pressure, but systolic pressure is now considered a more significant risk factor for cardiovascular disease in individuals over 50. However, an elevated reading in either or both numbers may be used to diagnose high blood pressure. Isolated diastolic hypertension, where only the bottom number is high, is also a recognized medical condition.