How to Calculate MAP

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MAP stands for the mean arterial pressure, and it is technically a measure of the product of the cardiac output (CO) and the systemic vascular resistance (SVR) plus the central venous pressure (CVP), but these numbers are difficult to gauge. Systolic and diastolic numbers from the blood pressure reading are instead used to calculate an approximation of MAP. (See link in References)

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  1. 1

    Subtract the diastolic pressure (smaller number) from the systolic. For instance, if the blood pressure reading is 120/80 mmHg, you will subtract 80 from 120 to get 40.

  2. 2

    Divide the answer from Step 1 by 3. So you will divide 40 by 3 to get approximately 13.333.

  3. 3

    Add the number from Step 2 to the diastolic reading to get the approximate MAP value. In the example, you will add 13.3333 to 80 to get an approximate MAP of 93.3333.

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