Lee et al reported a score based on the modified early warning score (MEWS) and SpO2 to FIO2 ratio. This can help to identify acute deterioration in a patient. The authors are from Asan Medical Center and the University of Ulsan in Seoul.
Parameters:
(1) modified early warning score (MEWS)
(2) SpO2 in percent
(3) FIO2, from 0.21 to 1.00
SpO2 to FIO2 ratio =
= (SpO2) / FIO2)
SpO2/FIO2
Points
> 315
0
235.01 to 315
1
<= 235
2
total score =
= (MEWS) + (points for the SpO2/FIO2 ratio)
Interpretation:
• A total score >= 7 was associated with in-hospital mortality.
Performance:
• The area under the ROC curve was 0.74.
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