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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.
Blood pressure has two components, systolic and diastolic pressure. Systolic pressure is the first number of a blood pressure measurement and reflects the pressure inside arteries when the heart pumps. Diastolic pressure, the second number, is the pressure when the heart relaxes between beats. High diastolic blood pressure -- also known as isolated diastolic hypertension or IDH -- is distinct from isolated systolic hypertension or elevation of both the systolic and diastolic blood pressure.