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Table 1 PRESERVE score parameters [9]

From: External validation of scores proposed for estimation of survival probability of patients with severe adult respiratory distress syndrome undergoing extracorporeal membrane oxygenation therapy: a retrospective study

Parameter   Points
Age (years) <45 0
  45-55 2
  >55 3
Body mass index >30 kg/m2 −2
Immunocompromiseda   2
Mechanical ventilation >6 days 1
SOFA >12 1
No prone positioning before ECMO   1
PEEP <10 cmH2O 1
Peak inspiratory pressureb >35 cmH2O 1
  1. aDefined as hematological malignancy, solid tumor, solid organ transplantation, high-dose or long-term corticosteroid and/or immunosuppressant use or HIV infection. bOr plateau pressure >30 cmH2O = 1 point as proposed by Schmidt and colleagues [9]. ECMO, extracorporeal membrane oxygenation; PEEP, positive end-expiratory pressure; PRESERVE, Predicting Death for Severe ARDS on VV-ECMO; SOFA sepsis-related organ failure assessment.