\[SVI=\frac{SV}{BSA}\]
Variables
SVIstroke volume index (mL/beat/m²)
SVstroke volume (mL/beat)
BSAbody surface area (m²)
Description
What is this formula?
The Stroke Volume Index (SVI) is the stroke volume normalized to body surface area. It indicates how much blood the heart ejects with each heartbeat relative to patient size.
When to use it
Use this formula in hemodynamic monitoring, critical care, cardiac surgery, and heart failure evaluation. SVI helps assess ventricular performance while accounting for differences in body size.
Example
Data:
Stroke Volume (SV) = 75 mL/beat
Body Surface Area (BSA) = 1.9 m²
Formula:
SVI = SV / BSA
Substitution:
SVI = 75 / 1.9
Result:
SVI = 39.47 mL/beat/m²
Applications
- Assessment of ventricular function
- Hemodynamic monitoring
- Fluid responsiveness evaluation
- Cardiac surgery management
- Critical care medicine