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

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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
• Vasopressors and InotropesSVR and BP · Mild fall · Larger fall
• Obstetric EmergenciesSVR, dyn·s·cm⁻⁵ · 1,210 · 1,530 · Sedatives and vasodilators drop BP fast

Related calculators

• Cardiac Index (CI)
• Cardiac Output (Fick Principle)
• Cerebral Perfusion Pressure (CPP)
• Mean Arterial Pressure (MAP)
• Oxygen Delivery (DO₂)
• Pulmonary Vascular Resistance (PVR)
• QTc (Bazett)
• Shock Index

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