Mean arterial pressure

The mean arterial pressure (MAP) is a term used in medicine to describe an average blood pressure in an individual. It is defined as the average arterial pressure during a single cardiac cycle.

Total Peripheral Resistance (TPR) is represented mathematically by the formula:mean arterial pressure

R = ΔP/Q

R is TPR. ΔP is the change in pressure across the systemic circulation from its beginning to its end. Q is the flow through the vasculature (equal to cardiac output)

In other words:

Total Peripheral Resistance = (Mean Arterial Pressure - Mean Venous Pressure) / Cardiac Output

Therefore, Mean arterial pressure can be determined from:

where:

At normal resting heart rates ${\displaystyle MAP}$ can be approximated using the more easily measured systolic and diastolic pressures, ${\displaystyle SP}$ and ${\displaystyle DP}$:

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