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What is the mean arterial pressure? The mean arterial pressure (MAP) is defined as an approximation of a time-weighted average of blood pressure values in large system arteries during the cardiac cycle. It is directly related to the cardiac output. To calculate the MAP, you need two values - you systolic and diastolic blood pressure.
Systolic vs Diastolic Pressure. The pressure on the arterial wall during the phase of the heartbeat when the heart muscle contracts and pumps blood from the chambers into the arteries is called systolic pressure.