Estimation
At normal resting heart rates can be approximated using the more easily measured systolic and diastolic pressures, and :
or equivalently
or equivalently
or equivalently
where is the pulse pressure,
It's slightly less than the value half way between systolic and diastolic pressure because systole is shorter than diastole, so you put the diastole twice
At high heart rates is more closely approximated by the arithmetic mean of systolic and diastolic pressures because of the change in shape of the arterial pressure pulse.
Read more about this topic: Mean Arterial Pressure
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