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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.
The first reading, the systolic pressure, measures the pressure when the heart is pumping blood to the body through the arteries. The second reading, the diastolic pressure, measures the pressure within the arteries when the heart is receiving blood returning from the body. There needs to be an underlying pressure within arterial blood vessels regardless of whether the heart is pumping or not.