Evaluation of oxygen reserve index as an early warning indicator of hypoxemia in anesthetized dogs.

ABSTRACT: The oxygen reserve index (ORi) is a non-invasive parameter recently introduced in human medicine that detects impending hypoxemia earlier than peripheral oxygen saturation (SpO₂). This study evaluated the utility of ORi as an early warning indicator of hypoxemia in anesthetized dogs. Six beagle dogs were subjected to planned apnea under two oxygen conditions (FiO₂ 1.0 and 0.4). Changes in ORi, SpO₂, and arterial oxygen partial pressure (PaO₂) were monitored. Warning times (WT) were calculated as the time difference between each timepoint and SpO₂ reaching 90%. We defined Added warning times (AWT) as the time between an ORi warning point and the moment SpO₂ fell to 96%. When ORi decreased to half of its baseline value or reac

SUBMITTER: Hirokawa T 

PROVIDER: S-EPMC12719022 | biostudies-literature | 2025 Dec

REPOSITORIES: biostudies-literature