Hemodynamics

Systemic Vascular Resistance (SVR) Calculator

Afterload of the left ventricle from MAP, CVP and cardiac output; low in vasodilatory shock, high in cardiogenic and hypovolemic shock.

Reviewed by Alex G, BSN, RN, CEN, CCRN, CMC, NREMT-P · From the Reference tab of the app

Turn on JavaScript to use this calculator, or open it in the web app.

Formula

SVR = (MAP - CVP) / CO × 80

Reference: Normal 800–1200

How it is used

• Normal SVR is 800–1200 dyn·s/cm⁵.
• Low SVR: vasodilatory (distributive) shock, such as sepsis, anaphylaxis or neurogenic shock.
• High SVR: compensatory vasoconstriction in cardiogenic or hypovolemic shock; check the filling pressures to tell them apart.

Same formula as the app. Open it in the web app.

Related one-pagers

• Hemodynamic NormalsSVR · 800–1200 · dyn·s/cm⁵
• Shock Types at a GlanceSVR · 1,490 · 1,370 · 500 · 1,230 · 1,200
• Swan-Ganz (PA Catheter): Waveforms, Wedge and Normal ValuesSVR · 800–1200 dyn·s/cm⁵ · (MAP − CVP) × 80 ÷ CO
• Sepsis and Septic Shock BundleSVR · Normal or high · Low (<800 dyn·s·cm⁻⁵)

Related calculators

• Cardiac Index (CI)
• Cardiac Output (Fick Principle)
• Cardiac Output (HR × SV)
• Cerebral Perfusion Pressure (CPP)
• Coronary Perfusion Pressure
• Ejection Fraction (EF)
• Mean Arterial Pressure (MAP)
• Oxygen Delivery (DO₂)

For education and exam preparation only. Follow your institution’s protocols. For education and exam preparation only. Verify results independently and follow your institution’s protocols. Not a substitute for clinical judgment.