Crisafulli et al developed an equation for identifying a patient with COPD who may experience oxygen desaturation while walking. This can help to identify a patient who may benefit from more aggressive management. The authors are from the University of Modena and Reggio Emilia, the Catholic University of Rome, and Villa Pineta Hospital in Modena.
Patient selection: COPD
Outcome: oxygen desaturation wile walking:
Parameters:
(1) oxygen saturation in percent in arterial blood
(2) PaO2 in mm Hg
(3) FEV1 as percent of predicted
Parameter
Finding
Points
oxygen saturation
>= 96%
0
95%
1
93 or 94%
2
<= 92%
3
PaO2
>= 71 mm Hg
0
66 to 70 mm Hg
1
<= 65 mm Hg
2
FEV1 as percent of predicted
>= 53%
0
< 53%
1
where:
• The measurements are presumably on room air.
total score =
= SUM(points for all 3 parameters)
Interpretation:
• minimum score: 0
• maximum score: 6
• The higher the score the greater the risk of oxygen desaturation when walking.
Score
Risk
0 or 1
low
2 or 3
high
4 to 6
very high
Performance:
• The area under the ROC curve was 0.9.
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