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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.
There are two components to blood pressure: 1  Systolic pressure: The pressure in the artery during the ventricular contraction phase of the heart cycle. The pressure in the vessel is highest at this time. 2  Diastolic pressure: The pressure in the artery when the ventricles are relaxed.