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Systemic Vascular Resistance (SVR) Calculator

This calculator estimates Systemic Vascular Resistance (SVR), a key measure of afterload and vascular tone. It uses mean arterial pressure (MAP), central venous pressure (CVP), and cardiac output (CO) to assess blood flow resistance within systemic circulation.

SVR Estimator Using MAP, CVP, and CO

Input Fields
MAP
mmHg
Mean arterial pressure
CVP
mmHg
Central venous pressure
CO
L/min
Cardiac output
If enabled, the result will update automatically when you change any value.

Systemic Vascular Resistance Formula

Formula
$$SVR = 80 \cdot \frac{MAP – CVP}{CO}$$

Where:

  • $$SVR$$ = Systemic Vascular Resistance (dyn·s·cm⁻⁵)
  • $$MAP$$ = Mean Arterial Pressure (mmHg)
  • $$CVP$$ = Central Venous Pressure (mmHg)
  • $$CO$$ = Cardiac Output (L/min)
  • Constant 80 = unit conversion factor


Systemic Vascular Resistance (SVR) reflects the resistance the heart must overcome to pump blood through the systemic circulation. It’s calculated using MAP, CVP, and CO, and is an important hemodynamic parameter in critical care and cardiology. Elevated SVR may indicate vasoconstriction, hypovolemia, or left heart failure, while decreased SVR can occur with vasodilation or sepsis.

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