Age

18–49 years (+3 pts)+350–59 years (+1 pt)+1≥ 60 years (0 pts)+0

Immunocompromised Status

Not immunocompromised (0 pts)+0Immunocompromised (−2 pts)-2

Diagnosis

Viral pneumonia (+3 pts)+3Bacterial pneumonia (+3 pts)+3Asthma (+11 pts)+11Trauma/burn (+3 pts)+3Aspiration pneumonitis (+5 pts)+5Other acute respiratory diagnosis (+1 pt)+1Non-respiratory or chronic diagnosis (0 pts)+0

Prior Cardiac Surgery

No prior cardiac surgery (0 pts)+0Prior cardiac surgery (−3 pts)-3

Duration of Mechanical Ventilation Before ECMO

< 48 hours (+3 pts)+348 hours to 7 days (0 pts)+07–14 days (−1 pt)-1> 14 days (−2 pts)-2

Nitric Oxide Use Before ECMO

No inhaled NO (0 pts)+0Inhaled NO used (−1 pt)-1

Bicarbonate Infusion Before ECMO

No bicarbonate infusion (0 pts)+0Bicarbonate infusion used (−2 pts)-2

Cardiac Arrest Before ECMO Initiation

No cardiac arrest (0 pts)+0Cardiac arrest before ECMO (−2 pts)-2

PaCO₂ Before ECMO

PaCO₂ < 75 mmHg (0 pts)+0PaCO₂ ≥ 75 mmHg (+1 pt)+1

Peak Inspiratory Pressure ≥ 42 cmH₂O

Peak pressure < 42 cmH₂O (0 pts)+0Peak pressure ≥ 42 cmH₂O (−1 pt)-1

RESP Score (Respiratory ECMO Survival Prediction)

RESP Score (Respiratory ECMO Survival Prediction)