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Mean arterial pressure represents average blood pressure throughout the cardiac cycle. It's calculated from systolic and diastolic pressures.
Formule
Calculate: MAP = DBP + (SBP - DBP)/3 or MAP = (SBP + 2×DBP)/3
- MAP
- DBP + (SBP - DBP)/3 or MAP = (SBP + 2×DBP)/3 — DBP + (SBP - DBP)/3 or MAP = (SBP + 2×DBP)/3
- DBP
- (SBP + 2×DBP)/3 — (SBP + 2×DBP)/3
- SBP
- (SBP + 2×DBP)/3 — (SBP + 2×DBP)/3
Guide étape par étape
- 1Calculate: MAP = DBP + (SBP - DBP)/3 or MAP = (SBP + 2×DBP)/3
- 2Normal MAP ≈ 90 mmHg in adults
- 3MAP <60 mmHg risks end-organ damage
Exemples résolus
Entrée
SBP 120, DBP 80
Résultat
MAP = 93 mmHg (normal)
Also can use (120 + 160)/3
Erreurs courantes à éviter
- ✕Treating MAP as if it directly correlates to systolic (it doesn't)
- ✕Forgetting that diastolic weighs more than systolic in formula
Questions fréquentes
Why is MAP important?
It better reflects perfusion pressure than systolic alone; organs require minimum MAP (~60 mmHg) to function.
How do vasopressors work?
They increase systolic/diastolic pressure, raising MAP to improve organ perfusion in shock.
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