Fluid Responsiveness Assessment — free guideline decision tool
Dynamic fluid-responsiveness assessment to guide whether further fluids will increase cardiac output.
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Implements the decision logic from published clinical guidelines.
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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.
| Assessment method | Passive leg raise (PLR, measure SV/CO change) |
|---|---|
| Value (PLR/challenge = SV or CO increase %; PPV/SVV = variation %) | 12 % |
| PPV/SVV applicability (mechanical ventilation Vt ≥ 8, sinus rhythm, no spontaneous breathing, no right-heart failure/intra-abdominal hypertension) | Met (or not a PPV/SVV method) |
→Fluid responsivenessResponsive
- Determination：Passive leg raise produced a stroke-volume/cardiac-output increase of 12% (threshold ≥ 10%) → fluid-responsive (a fluid bolus may increase cardiac output)
- Management direction：With evidence of hypoperfusion (high lactate/oliguria/prolonged CRT), give fluids cautiously and reassess; stop volume expansion once non-responsive or perfusion improves
- Note：Dynamic indices outperform static (CVP/single pressure predicts poorly). PLR and fluid challenge directly measure SV/CO change and remain applicable with spontaneous breathing and arrhythmia; PPV/SVV requires mechanical ventilation Vt ≥ 8, sinus rhythm, no spontaneous breathing, no right-heart failure/intra-abdominal hypertension. Give fluids on this basis only with signs of hypoperfusion
| Assessment method | PPV / SVV (pulse-pressure / stroke-volume variation) |
|---|---|
| Value (PLR/challenge = SV or CO increase %; PPV/SVV = variation %) | 12 % |
| PPV/SVV applicability (mechanical ventilation Vt ≥ 8, sinus rhythm, no spontaneous breathing, no right-heart failure/intra-abdominal hypertension) | Not met |
→PPV/SVVUnreliable
- Determination：PPV/SVV is reliable only with mechanical ventilation (Vt ≥ 8 mL/kg), sinus rhythm, no spontaneous breathing trigger, and no severe right-heart failure/intra-abdominal hypertension; the current conditions are not met
- Recommendation：Switch to passive leg raise (PLR) or fluid challenge (directly measuring stroke-volume/cardiac-output change), which remain applicable with spontaneous breathing/arrhythmia
- Basis：Dynamic indices outperform static (CVP predicts poorly); PPV/SVV applicability conditions
Common questions
What is Fluid Responsiveness Assessment?
Dynamic fluid-responsiveness assessment to guide whether further fluids will increase cardiac output.
How is Fluid Responsiveness Assessment calculated? What is the core formula?
Passive leg raise or 250–500 mL fluid challenge increasing stroke volume/cardiac output ≥ 10%, or PPV/SVV > 13% (with applicability conditions), indicates fluid responsiveness; dynamic indices outperform static CVP.
When is Fluid Responsiveness Assessment used?
Use during resuscitation to test responsiveness via passive leg raise, fluid challenge, or PPV/SVV before giving more fluid.
What are the key clinical points for Fluid Responsiveness Assessment?
PPV/SVV is only valid with controlled mechanical ventilation (Vt ≥ 8), sinus rhythm, and no spontaneous breathing — otherwise use PLR or a fluid challenge (original synthesis · not guideline verbatim). Responsiveness alone does not mandate fluids; give them only with concurrent signs of hypoperfusion. Static CVP predicts fluid responsiveness poorly and should not drive fluid decisions.
What are the limits and cautions when using Fluid Responsiveness Assessment?
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 Fluid Responsiveness Assessment calculated in practice? Can you show a worked example?
Inputs: Assessment method Passive leg raise (PLR, measure SV/CO change), Value (PLR/challenge = SV or CO increase %; PPV/SVV = variation %) 12 %, PPV/SVV applicability (mechanical ventilation Vt ≥ 8, sinus rhythm, no spontaneous breathing, no right-heart failure/intra-abdominal hypertension) Met (or not a PPV/SVV method) → Result: Fluid responsiveness Responsive（Determination: Passive leg raise produced a stroke-volume/cardiac-output increase of 12% (threshold ≥ 10%) → fluid-responsive (a fluid bolus may increase cardiac output), Management direction: With evidence of hypoperfusion (high lactate/oliguria/prolonged CRT), give fluids cautiously and reassess; stop volume expansion once non-responsive or perfusion improves, Note: Dynamic indices outperform static (CVP/single pressure predicts poorly). PLR and fluid challenge directly measure SV/CO change and remain applicable with spontaneous breathing and arrhythmia; PPV/SVV requires mechanical ventilation Vt ≥ 8, sinus rhythm, no spontaneous breathing, no right-heart failure/intra-abdominal hypertension. Give fluids on this basis only with signs of hypoperfusion） Inputs: Assessment method PPV / SVV (pulse-pressure / stroke-volume variation), Value (PLR/challenge = SV or CO increase %; PPV/SVV = variation %) 12 %, PPV/SVV applicability (mechanical ventilation Vt ≥ 8, sinus rhythm, no spontaneous breathing, no right-heart failure/intra-abdominal hypertension) Not met → Result: PPV/SVV Unreliable（Determination: PPV/SVV is reliable only with mechanical ventilation (Vt ≥ 8 mL/kg), sinus rhythm, no spontaneous breathing trigger, and no severe right-heart failure/intra-abdominal hypertension; the current conditions are not met, Recommendation: Switch to passive leg raise (PLR) or fluid challenge (directly measuring stroke-volume/cardiac-output change), which remain applicable with spontaneous breathing/arrhythmia, Basis: Dynamic indices outperform static (CVP predicts poorly); PPV/SVV applicability conditions）
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Dynamic fluid-responsiveness assessment to guide whether further fluids will increase cardiac output.
Open guideline tool →For licensed clinicians. Not a substitute for clinical judgement.
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