Peer-reviewed veterinary case report
Using oxygen reserve index to spot low oxygen early in dogs
By Zanusso, Francesca et al.·Published in Research in veterinary science·2024·Department of Animal Medicine, Italy·View original on PubMed →
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Original publication title: Exploring oxygen reserve index for timely detection of deoxygenation in canine patients recovering from anesthesia.
- Species:
- dog
Plain-English summary
A group of dogs recovering from anesthesia had their oxygen levels monitored using a new method called the oxygen reserve index (ORi). This study found that ORi could detect drops in oxygen levels earlier than traditional pulse oximetry (SpO), giving veterinarians more time to respond. For example, in normal-weight dogs, ORi dropped to a level indicating trouble about 87 seconds before SpO showed a problem, while it was about 49 seconds for overweight dogs. This early warning could be especially helpful for obese dogs, allowing for quicker intervention if their oxygen levels start to fall.
People also search for: dog anesthesia recovery · oxygen levels in dogs · monitoring dog breathing after surgery
Abstract
Pulse oximetry (SpO) identifies a decrease in the partial pressure of oxygen (PaO) when it falls below 80 mmHg, while oxygen reserve index (ORi), a dimensionless index ranging from 0 to 1, detects PaOchanges between 100 and 200 mmHg. This study investigates the usefulness of ORi in detecting impending deoxygenation before traditional SpO. Fifty-one dogs undergoing anesthesia were mechanically ventilated maintaining a fraction of inspired oxygen of 0.50 and an ORi of 1. Animals were classified according to their body condition score (BCS) as normal-fit (BCS 4-5/9), overweight (BCS 6-7/9), or obese (BCS 8-9/9). At the end of the procedure, dogs were placed in sternal recumbency, and after 10 min disconnected from the ventilator and maintained in apnea. ORi added warning time was determined at various ORi values as the time difference in reaching SpOof 95% from ORi of 0.9 and 0.5, compared to the SpOwarning time from SpOof 98%. During apnea, ORi decreased before noticeable SpOchanges. An ORi of 0.9 anticipated an SpOof 95% in normal-fit dogs by 87 (33-212) [median (range)] seconds or in those with a BCS ≥ 6/9 by 49 (7-161) seconds. Regardless of the BCS class, the median time from ORi of 0.5 to SpOof 95% was 30-35 s. ORi declined from 0.9 to 0.0 in 68 compared to 33 s between normal-fit and obese dogs (p < 0.05). In dogs, ORi added warning time could facilitate timely intervention, particularly in obese patients.
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Search related cases →Original publication on PubMed: https://pubmed.ncbi.nlm.nih.gov/38631076/