🫀 Fick Cardiac Output / Cardiac Index
UseEstimates cardiac output (CO) by the Fick principle from oxygen consumption and arteriovenous oxygen differen…
StrataCO = VO₂ / (1.34 × Hb × (SaO₂ − SvO₂)). Usual reference ranges: CO ~4–8 L/min, CI ~2.5–4.0 L/min/m². VO₂ is b…
LimitsNot a diagnosis or disposition decision on its own. · Interpret with history, examination and other tests. · For licensed clinicians; does not replace clinical judgement.
SourceLaFarge CG, Miettinen OS. The estimation of oxygen consumption. Cardiovasc Res 1970;4(1):23-30
This-shift next steps
After scoring: open the scene pack, peer scores, and the matching pathway. Local reference — no HIS write.
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Methodology · worked example, guidelines & full notes
CO = VO₂ / (1.34 × Hb × (SaO₂ − SvO₂)); CI = CO / BSA
When to use
Estimates cardiac output (CO) by the Fick principle from oxygen consumption and arteriovenous oxygen difference, also giving the cardiac index (CI) when BSA is provided.
How it works
CO = VO₂ / (1.34 × Hb × (SaO₂ − SvO₂)); CI = CO / BSA
Key points
- CO = VO₂ / (1.34 × Hb × (SaO₂ − SvO₂)); CI = CO / BSA
References
Worked calculation
The values below come from this tool's own example placeholders and are computed server-side with the formula shown on this page, so the arithmetic can be checked quickly. It demonstrates how to substitute values only — it is not clinical advice and not a real case.
| Oxygen consumption VO₂ | 250 mL/min |
|---|---|
| Hemoglobin | 130 g/L |
| Arterial oxygen saturation SaO₂ | 98 % |
| Mixed venous oxygen saturation SvO₂ | 70 % |
| Body surface area (optional, for CI) | 1.7 m² |
→Cardiac output CO5.13L/min
- Arteriovenous O₂ difference：48.8 mL/L
- Cardiac index CI：3.01 L/min/m²
Verification & sources · governance
FAQ
Frequently asked questions
- Does Fick Cardiac Output / Cardiac Index upload patient data? Where is it calculated?
- Calculation runs locally in the browser; inputs and results are not uploaded. For licensed clinicians only; interpret with history, investigations and local protocols — not a diagnosis or prescription.
- How is Fick Cardiac Output / Cardiac Index calculated in practice? Can you show a worked example?
- Inputs: Oxygen consumption VO₂ 250 mL/min, Hemoglobin 130 g/L, Arterial oxygen saturation SaO₂ 98 %, Mixed venous oxygen saturation SvO₂ 70 %, Body surface area (optional, for CI) 1.7 m² → Result: Cardiac output CO 5.13 L/min（Arteriovenous O₂ difference: 48.8 mL/L, Cardiac index CI: 3.01 L/min/m²）