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The difference between the systolic and diastolic pressures is known as pulse pressure, [1] while the average pressure during a cardiac cycle is known as mean arterial pressure. [ 2 ] Blood pressure is one of the vital signs —together with respiratory rate , heart rate , oxygen saturation , and body temperature —that healthcare ...
Pulse pressure is calculated as the difference between the systolic blood pressure and the diastolic blood pressure. [3] [4]The systemic pulse pressure is approximately proportional to stroke volume, or the amount of blood ejected from the left ventricle during systole (pump action) and inversely proportional to the compliance (similar to elasticity) of the aorta.
The difference between the systolic and diastolic pressures is referred to as pulse pressure (not to be confused with pulse rate/heartrate) and has clinical significance in a wide variety of situations. It is generally measured by first determining the systolic and diastolic pressures and then subtracting the diastolic from the systolic.
Systolic measures the pressure during heartbeats, and diastolic measures the pressure between beats. Blood pressure is measured in units called millimeters of mercury, or mm Hg. Normal blood ...
The difference between the systolic and diastolic pressure is called the pulse pressure. The measurement of these pressures is now usually done with an aneroid or electronic sphygmomanometer . The classic measurement device is a mercury sphygmomanometer, using a column of mercury measured off in millimeters .
However, there has recently been a move towards the use of the fifth Korotkoff sound (i.e. silence) as the diastolic blood pressure, as this has been felt to be more reproducible. [9] For paediatrics, there has been controversy regarding whether to use auscultation of the fourth or fifth Korotkoff sound as an indicator of diastolic pressure ...
Pulse pressure (the difference between systolic and diastolic blood pressure) is frequently increased in older people with hypertension. [79] This can mean that systolic pressure is abnormally high, but diastolic pressure may be normal or low, a condition termed isolated systolic hypertension. [80]
Pulse pressure, which is the difference between the systolic ("top number") and diastolic ("bottom number") blood pressures, is often low/narrow (i.e. 25% or less of the level of the systolic) in people with heart failure, and this can be an early warning sign. [29]