Differences between Diastolica-Sistolica-Presion-Arterial
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Systolic vs. diastolic pressure
Systolic and diastolic pressure are the two measurements used to determine blood pressure.[1] Blood pressure is recorded as two numbers, written as a ratio, such as 120/80 mmHg.[2][3][4] The first number is the systolic pressure, and the second is the diastolic pressure.[2][3] Both are measured in millimeters of mercury (mmHg).[2]
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.[5][6] Diastolic pressure measures the pressure in the arteries when the heart is at rest between beats, refilling with blood.[5] 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).[5] | The pressure in the arteries during the heart's relaxation and filling phase (diastole).[5] |
| Position in Reading | The top or first number.[5][3] | The bottom or second number.[5][3] |
| Cardiac Action | Heart is actively pumping blood out to the body.[6] | Heart is resting and refilling with blood between beats. |
| Relative Value | The higher of the two numbers.[2] | The lower of the two numbers.[2] |
| Normal Range (Adults) | Less than 120 mmHg.[7] | Less than 80 mmHg.[7] |
Clinical Significance
Both systolic and diastolic readings are used to diagnose and manage hypertension (high blood pressure).[6] 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.[4]
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.[8] 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.
References
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