Systemic Vascular Resistance Calculator

Calculates systemic vascular resistance from pressure gradient and cardiac output.

Inputs

Color mode links each input to the matching equation term and solving arithmetic.

Equation and Work

Equation:
Solving steps:
Pressure gradient
—
mmHg
Resistance
—
mmHg·min/L
Resistance
—
dyn·s·cm⁻⁵
Normal/reference: SVR 900–1400 dyn·s·cm⁻⁵, equivalent to 11.25–17.5 mmHg·min/L.

Clinical Significance

Systemic vascular resistance estimates afterload across the systemic circulation. The constant 80 converts mmHg·min/L into dyn·s·cm⁻⁵ after the MAP-to-RA pressure gradient is divided by cardiac output.

SVR helps interpret vasoconstriction and vasodilation in shock and hemodynamic monitoring.

Use MAP, RA/CVP, and cardiac output from the same time period.

References (APA 7th Edition)

  1. Attached equations reference supplied by the user for calculator equation confirmation.