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MAP
Mean Arterial Pressure is a value that
is frequently used by Physicians and Paramedics to assess a patient's hemodynamic status. For example, each
organ system requires a certain MAP to adequately perfuse that organ. In
addition to this, the MAP is a number used in other important formulas such as
the Cerebral Perfusion Pressure (CPP) formula.
MAP should not be a foreign concept to EMTs as most of todays hospital and ambulances use automated blood pressure devices that display the MAP in addition to the pulse, systolic and diastolic pressures.
The MAP value is fairly easy to calculate. If you double the diastolic pressure, add the systolic number to it and divide that number by 3 you will have a very close approximation. Don't worry about minor variations from automatic devices as they may incorporate a more complicated formula that takes heart rate into consideration. For most instances in EMS, this is not critical and does not change the value a great deal.
MAP = [(2*D)+S] / 3
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