U01.21.021 Mean Arterial Pressure (MAP)

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Learning Objective:
Understand and apply formulas for mean arterial pressure (MAP), which represents the average arterial pressure during a single cardiac cycle.

Formulas:

MAP = CO \times TPR

MAP \ (\text{at resting HR}) = \frac{2}{3} DBP + \frac{1}{3} SBP = DBP + \frac{1}{3} PP

Explanation:

  • CO = Cardiac Output
  • TPR = Total Peripheral Resistance
  • SBP = Systolic Blood Pressure
  • DBP = Diastolic Blood Pressure
  • PP = Pulse Pressure (PP = SBP - DBP)
  • The first formula expresses MAP as the product of CO and systemic vascular resistance.
  • The second formula estimates MAP from blood pressure measurements, accounting for longer diastolic than systolic duration at resting heart rates.

Example (Using SBP/DBP):

Given:
SBP = 120 \text{ mmHg}
DBP = 80 \text{ mmHg}

PP = 120 - 80 = 40

MAP = 80 + \frac{1}{3} \times 40 = 80 + 13.3 = 93.3 \text{ mmHg}

✅ Answer: MAP ≈ 93 mmHg

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