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Mean Arterial Blood Pressure (MAP)

figure

This pressure (MAP) is defined as the average pressure in the arteries during the cardiac cycle.

Since diastole (D in figure) occupies two thirds of the cycle and systole (S) one third (at a rate of 72), the mean pressure (MAP) is closer to arterial diastolic pressure than to arterial systolic pressure. During ejection, the arterial pressure rises to its apogee; during diastole, it reaches its perigee. These pressures (120 mmHg systolic and 80 mmHg diastolic in the figure) are above and below the average pressure during the cycle, which can be calculated from the systolic and diastolic pressure given above, using the following formula:

Mean Arterial Pressure (MAP) = Diastolic Pressure + 1/3Pulse Pressure.

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