Mean Arterial Pressure
Estimated average arterial pressure across the cardiac cycle, from systolic and diastolic pressure.
Formula
MAP = DBP + ⅓ × (SBP − DBP)
Result
Enter all values to see the result.
Limitations
- This formula is an approximation that assumes a normal arterial waveform and resting heart rate — it is less accurate at very high heart rates or with an abnormal waveform, where a directly measured (e.g. arterial line) MAP is more reliable.
- A MAP ≥ 65 mmHg is a common resuscitation target, not a universally correct one — individual targets vary with chronic blood pressure, the specific diagnosis, and clinical context.
- Cuff-derived blood pressure can be inaccurate in shock states with significant vasoconstriction; an arterial line is preferred when precision matters.
References
- Standard hemodynamic formula: MAP ≈ diastolic pressure + one-third of pulse pressure.
Clinical Context & Relevant Topics (5)
Disease ReferenceCellular dysoxia, DO2/VO2 physiology, the 4 shock phenotypes, dynamic fluid responsiveness (PLR/PPV) vs fluid tolerance (VExUS), and vasoactive pharmacology.
The subset of sepsis with profound circulatory and cellular/metabolic abnormality — clinically identified by a vasopressor requirement to maintain MAP ≥ 65 mmHg plus lactate > 2 mmol/L despite adequate fluid resuscitation.
Primary pump failure, SCAI staging (A–E), PAC hemodynamics (CPO, PAPi), inotrope selection, emergent revascularization, and mechanical circulatory support.
Target organ damage assessment, intravenous antihypertensive titration, and emergency-specific blood pressure targets.
Monro-Kellie doctrine, ICP waveforms (P2>P1, Lundberg A-waves), CPP targets (60–70 mmHg), herniation syndromes, and the 4-tier BTF management protocol.
Relevant Clinical Pathways (18)
Decision ProtocolsFrom recognizing hypoperfusion and initial crystalloid bolus to dynamic fluid responsiveness assessment and vasopressor targets.
From first-line norepinephrine titration to multi-agent vasopressor escalation and inotrope selection.