Peer-reviewed veterinary case report
Using CO2/O2 gas mix to improve breathing tests in healthy and sick
By Chang, Wei-Tao et al.·Published in American journal of veterinary research·2025·National Taiwan University Veterinary Hospital·View original on PubMed →
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Original publication title: Enhanced breathing effort in pulmonary function tests by CO2/O2 gas mixture and barometric whole-body plethysmography in healthy and feline lower airway disease cats.
- Species:
- cat
Plain-English summary
A group of healthy cats and cats with feline lower airway disease (FLAD) underwent breathing tests using a special gas mixture of CO2 and O2 to see how it affected their breathing. The results showed that both groups had significant improvements in their breathing measurements, such as how much air they could take in and how fast they could breathe out. All the cats tolerated the gas mixture well and recovered quickly after the test. This method could be a useful tool for veterinarians to better assess breathing issues in cats.
People also search for: cat breathing problems · feline lower airway disease treatment · how to help my cat breathe better
Abstract
OBJECTIVE: Enhancing ventilatory effort during pulmonary function testing can help reveal flow limitations not evident in normal tidal breathing. This study aimed to assess the efficacy and tolerability of using a CO2/O2 gas mixture to enhance tidal breathing with a barometric whole-body plethysmography system in both healthy cats and those with feline lower airway disease (FLAD). METHODS: This prospective study included healthy cats and those with FLAD, which underwent pulmonary function testing and were exposed to a 10% CO2/90% O2 gas mixture in a barometric whole-body plethysmography chamber, with CO2 concentrations maintained within the target range of 5% to 10%. RESULTS: A total of 10 healthy cats and 15 FLAD cats were included. In healthy cats, tidal volume, minute volume, peak inspiratory flow, and peak expiratory flow per kilogram body weight increased significantly by medians of 4.3-, 3.5-, 3.1-, and 4.0-fold, respectively (P = .005). Cats with FLAD showed similar results, with 4.1-, 3.2-, 2.8-, and 3.7-fold increases (P < .001). Respiratory rate decreased in both healthy (52 to 40 breaths/min; P = .005) and FLAD cats (57 to 45 breaths/min; P = .04) after CO2 enhancement. All cats tolerated the CO2/O2 gas mixture well, with recovery within 60 to 120 seconds after returning to room air. CONCLUSIONS: A CO2/O2 gas mixture successfully enhanced ventilatory variables in tidal breathing analysis and showed good tolerability in both healthy and FLAD cats. CLINICAL RELEVANCE: This approach provides a practical option for short-term breathing effort enhancement in cats for clinical settings.
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Search related cases →Original publication on PubMed: https://pubmed.ncbi.nlm.nih.gov/39870042/