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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.
Basic Physiology Arterial blood pressure is generated by the ejection of blood from the left ventricle (LV) into the arterial vasculature. The amount of pressure generated is determined by the volume of blood ejected as well as the resistance to ejection within the systemic vascular network.