Accuracy of Respiratory Rate Monitoring Using Thammasat Capnoline During Total Intravenous Anesthesia: a Modified Oxygen Nasal Cannula-Based Capnometry Device
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Abstract
Continuous respiratory monitoring is crucial for patients receiving total intravenous anesthesia (TIVA), as respiratory depression such as hypoventilation and apnea can be difficult to detect. Capnometry via nasal cannula offers a cost-effective method for continuous
end-tidal carbon dioxide (ETCO2) monitoring. This study evaluated the correlation between respiratory rates measured by the Thammasat Capnoline device and clinical assessment during TIVA with supplemental oxygen. A prospective observational study was conducted on 63 patients (aged 18–65 years, ASA I–III) undergoing procedures under TIVA. Respiratory rates were simultaneously measured using thoracoabdominal observation and capnometry at various oxygen flow rates. The participants (38.10% male) had a mean age of 40.62 years and mean BMI of 23.46 kg/m2, with ASA I (55.56%), II (42.86%), and III (1.59%). Mean respiratory rates (breaths/min) showed no significant difference between methods across oxygen flow rates: 2 L/min (17.12 vs 17.39, 𝑝 = 0.119), 3 L/min (17.35 vs 17.49, 𝑝 = 0.455), 4 L/min (17.32 vs 17.31, 𝑝 = 0.929), and 5 L/min (17.69 vs 17.69, 𝑝 = 0.998). Oxygen flow variation did not affect accuracy (𝑝 = 0.901). Thus, Thammasat Capnoline provides reliable respiratory monitoring comparable to clinical assessment during TIVA.
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