Fig. 2From: Non-invasive monitoring of oxygen delivery in acutely ill patients: new frontiersExample of the oxygen reserve index (ORI) during intubation in pediatric surgery. Note early increase of ORI during pre-oxygenation; decline in ORI triggering alarm before any change in SpO2 occurs; disappearance of ORI when SpO2 <100 %; re-appearance once SpO2 >100 %. (Figure provided by Masimo Corp. Irvine, CA, USA)Back to article page