Hemodynamics: Cardiac Index, Stroke Volume, SVR/PVR Suite
Cardiac index, stroke volume / index, and SVR / PVR from thermodilution cardiac output and invasive pressures (Swan-Ganz; ESC/ERS 2022).
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Cardiac output
- 5 L/min
- Heart rate
- 80 bpm
- Body surface area
- 2 m^2
- Mean arterial pressure
- 90 mmHg
- Central venous pressure
- 5 mmHg
- Mean pulmonary artery pressure
- 20 mmHg
- Pulmonary capillary wedge pressure
- 10 mmHg
Result: Cardiac index 2.5 L/min/m^2, stroke volume 62.5 mL, SVR 1360, PVR 2 Wood units, PVRI 320.
The tool opens with these values already filled in. Replace them with your own.
What the result means
- CI 2.5-4.0 L/min/m^2
- Normal cardiac index; below 2.5 is the low-output range.
- SVR 800-1200 dynes·s·cm^-5
- Normal systemic resistance; high suggests vasoconstriction, low suggests a distributive (vasodilated) state.
- PVR under 2 Wood units
- Normal pulmonary resistance; over 2 WU defines pre-capillary pulmonary hypertension (ESC/ERS 2022).
- Conversion
- The ×80 factor converts mmHg/(L/min) to dynes·s·cm^-5; Wood units are the un-scaled mmHg·min/L form.
What you enter
- Cardiac output
- Heart rate
- Body surface area
- Mean arterial pressure
- Central venous pressure
- Mean pulmonary artery pressure
- Pulmonary capillary wedge pressure
How this is calculated
Swan HJC, Ganz W, Forrester J, et al. Catheterization of the heart in man with use of a flow-directed balloon-tipped catheter. N Engl J Med. 1970;283(9):447-451. PVR in Wood units per the 2022 ESC/ERS pulmonary hypertension guideline (Humbert M, et al. Eur Heart J. 2022;43(38):3618-3731). Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.