Which patients are appropriate candidates for dynamic fluid responsiveness assessment?

Dynamic tests (PPV, SVV, passive leg raise) are most accurate in patients with: controlled mechanical ventilation, tidal volume ≥8 mL/kg, sinus rhythm (not atrial fibrillation), and no significant right heart failure. PPV and SVV lose accuracy with spontaneous breathing efforts, arrhythmias, and tidal volumes <7 mL/kg (common in lung-protective ARDS ventilation). Passive leg raise is applicable regardless of ventilation mode or rhythm.

What is the threshold for predicting fluid responsiveness?

A positive fluid response (≥10–15% increase in cardiac output/stroke volume after 500 mL fluid challenge) is predicted by: PPV >13%, SVV >13%, passive leg raise-induced cardiac output increase ≥10%, or end-expiratory occlusion test cardiac output increase ≥5%. In a 2016 meta-analysis (Marik et al.), PPV had AUC 0.94 for predicting fluid responsiveness in appropriate patient subgroups — but only ~50% of all ICU patients are actually fluid-responsive.

Fluid Responsiveness Predictor

Predict fluid responsiveness in mechanically ventilated ICU patients using pulse pressure variation (PPV), stroke volume variation (SVV), or passive leg raise response to guide resuscitation.

⚕ Clinical Disclaimer: These calculators are for educational and reference purposes only. Always verify results with qualified clinical judgment and current clinical guidelines. Do not use as a sole basis for medical decisions.

How It Works

Predict fluid responsiveness in mechanically ventilated ICU patients using pulse pressure variation (PPV), stroke volume variation (SVV), or passive leg raise response to guide resuscitation

Each component has a specific meaning:

Pulse pressure variation — The pulse pressure variation recorded for the scenario being assessed.
Stroke volume variation — The stroke volume variation recorded for the scenario being assessed.
Or passive leg raise response — The or passive leg raise response recorded for the scenario being assessed.

Note: Interpret the fluid responsiveness result against the thresholds and context described above.

How to Use

Enter the pulse pressure variation, stroke volume variation, or passive leg raise response for the scenario you are assessing. Predict fluid responsiveness in mechanically ventilated ICU patients using pulse pressure variation (PPV), stroke volume variation (SVV), or passive leg raise response to guide resuscitation. Use the fluid responsiveness result to inform your calculation.

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Fluid Responsiveness Predictor

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Frequently Asked Questions

Which patients are appropriate candidates for dynamic fluid responsiveness assessment?

What is the threshold for predicting fluid responsiveness?