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Mean arterial pressure and shock index

Cardiovascular

MAP is the perfusion pressure the vasopressor target is set against (≥65 mmHg in septic shock). Shock index catches occult shock before the blood pressure falls.

What you enter

  • Systolic BP (mmHg)
  • Diastolic BP (mmHg)
  • Heart rate (/min)
FORMULAMAP = DBP + (SBP − DBP) ÷ 3; Shock index = HR ÷ SBP (normal 0.5–0.7)
SourceRady MY et al. A comparison of the shock index and conventional vital signs to identify acute, critical illness in the emergency department. Ann Emerg Med 1994;24:685-90ReviewedFormula and thresholds checked against the source on 2026-08-22. If the source updates, this line will say so.