Data elements:
(1) respiratory rate in breaths per minute
(2) PaCO2 in kPa
(3) FIO2: inspired oxygen fraction from 21 to 100
(4) mean airway pressure in cm H2O
(5) PaO2 in kPa
Red Cross score =
= (respiratory rate) * (PaCO2) * (FIO2) * (mean airway pressure) / ((PaO2) * 6000)
where:
• Division by 6000 gives a score around 1 when all of the variables are normal.
Interpretation:
• minimum score: around 0.2 (does not reach 0)
• maximum score: around 65
• A score <= 5 indicates probable survival.
• A score > 5 indicates probable death. The mean score for those who did not survive was about 38.
Performance of score:
• predictive value of mortality: 100%
• predictive value of survival: 85%
• overall predictive value: 91.6%
