How to calculate mean arterial pressure (MAP)

Mean arterial pressure (MAP) is defined as the common pressure in a patient’s arteries during one cardiac cycle. It is taken into account to be a greater indicator of significant organ perfusion than systolic blood pressure (SBP). True MAP can only be determined through invasive monitoring and complicated calculations; nevertheless, they may also be calculated using the formula for SBP and diastolic blood pressure (DBP).

Patterns of mean arterial pressure

To calculate mean arterial pressure, double the diastolic blood pressure and add the sum to the systolic blood pressure. Then divide by 3. For example, if the patient’s blood pressure is 83 mm Hg/50 mm Hg, the MAP might be 61 mm Hg. Here are the steps for this calculation:

MAP = SBP + 2 (DBP)

3

MAP =Â 83 +2 (50)

3

MAP = 83 +100

3

MAP = 183

3

MAP = 61 mm Hg

Another option to calculate MAP is to first calculate your pulse pressure (subtract DBP from SBP) and divide by 3, then add DBP:

MAP = 1/3 (SBP – DBP) + DBP

MAP = 1/3 (83-50) + 50

MAP = 1/3 (33) + 50

MAP = 11 + 50

MAP = 61 mm Hg

There are several clinical situations during which monitoring mean arterial pressure is especially necessary. In patients with sepsis, vasopressor doses are sometimes adjusted based on MAP. In the rules Surviving Sepsis Campaign.it is strongly recommended that mean arterial pressure (MAP) be maintained at a level greater than or equal to 65 mm Hg. Additionally, in patients with head trauma or stroke, treatment may depend upon the patient’s MAP

In what other clinical situations is MAP monitored? AND
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Evans, L, Rhodes, A, Alhazzani, W, Antonelli, M, Coopersmith, CM, French, C, Machado, FR, Mcintyre, L, Ostermann, M, Prescott, HC, Schorr, C., Simpson, S., Wiersinga, W.J., Alshamsi, F., Angus, D.C., Arabi, Y., Azevedo, L., Beale, R., Beilman, G., Belley-Cote, E., … Levy, M. (2021) . Surviving Sepsis Campaign: International Guidelines for the Management of Sepsis and Septic Shock 2021. , (11), 1181–1247. https://doi.org/10.1007/s00134-021-06506-y

Hinkle, J.L., Cheever, K.H., and Overbaugh. (2022). Brunner and Suddarth’s Textbook of Medical-Surgical Nursing, Fifteenth Edition. Philadelphia: Wolters Kluwer
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