🫀 Systemic Vascular Resistance (SVR)
Estimate afterload with systemic vascular resistance (SVR).
Clinical takeaway
Low SVR suggests distributive (e.g. septic) shock.
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When to use
Characterise shock states from haemodynamic data.
How it works
SVR = (MAP − CVP) / CO × 80. Normal 800–1200 dyn·s·cm⁻⁵.
Key points
- Low SVR suggests distributive (e.g. septic) shock.
- High SVR suggests cardiogenic/hypovolaemic shock.
- Interpret together with cardiac output.
References
Decision support for licensed clinicians only; not a substitute for clinical judgement, diagnosis or local protocols.
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.
| Mean arterial pressure | 90 mmHg |
|---|---|
| Central venous pressure | 5 mmHg |
| Cardiac output | 5 L/min |
→SVR1360dyn·s·cm⁻⁵
- Formula：(MAP − CVP) / CO × 80
- Normal：800–1200 dyn·s·cm⁻⁵
Frequently asked questions
- What is Systemic Vascular Resistance (SVR)?
- Estimate afterload with systemic vascular resistance (SVR).
- How is Systemic Vascular Resistance (SVR) calculated? What is the core formula?
- SVR = (MAP − CVP) / CO × 80. Normal 800–1200 dyn·s·cm⁻⁵.
- When is Systemic Vascular Resistance (SVR) used?
- Characterise shock states from haemodynamic data.
- What are the key clinical points for Systemic Vascular Resistance (SVR)?
- Low SVR suggests distributive (e.g. septic) shock. High SVR suggests cardiogenic/hypovolaemic shock. Interpret together with cardiac output.
- What are the limits and cautions when using Systemic Vascular Resistance (SVR)?
- For licensed clinicians and clinical researchers. Interpret results with history, investigations and local protocols; not a diagnosis or prescription, and not a substitute for multidisciplinary decision-making or local guidelines.
- How is Systemic Vascular Resistance (SVR) calculated in practice? Can you show a worked example?
- Inputs: Mean arterial pressure 90 mmHg, Central venous pressure 5 mmHg, Cardiac output 5 L/min → Result: SVR 1360 dyn·s·cm⁻⁵（Formula: (MAP − CVP) / CO × 80, Normal: 800–1200 dyn·s·cm⁻⁵）