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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.
Arterial blood pressure is the force exerted by the blood on the wall of a blood vessel. as the heart pumps (contracts) and relaxes. Systolic blood pressure is the degree of force when the heart. is pumping (contracting). The diastolic blood pressure is the degree of force when the hearts relaxed.