ArticleTurkish thoracic journal2021
Limitations of End-Tidal CO2 Measured with a Portable Capnometer to Estimate PaCO2 for Patients with Respiratory Disease.
Article in Turkish thoracic journal, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 3 papers.
What it found
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
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Who cites it
3 citing papers in PubMed, 6 citations in OpenAlex.
- Cardiorespiratory responses to muscle metaboreflex activation in fibrosing interstitial lung disease.Experimental physiology · 2022Trial
- Real-Time Estimation of Arterial Partial Pressure of Carbon Dioxide in Patients Undergoing General Anesthesia: Predictive Modeling Study.JMIR medical informatics · 2025Article
- Enhancing the estimation of PaCOBiomedical engineering online · 2024Article
Corrections and comments
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Authors and funding
9 authors at 1 institution in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
objectiveThis study evaluated the relationship between end-tidal carbon dioxide (EtCO2) measured with a portable capnometer and PaCO2 in respiratory disease patients. MATERIAL AND
methodsWe retrospectively reviewed patients whose EtCO2, measured with a portable capnometer using a mouthpiece, and PaCO2 were simultaneously assessed at a single center from August 2017 to September 2018. The primary outcome was the relationship between EtCO2 and PaCO2. We conducted subgroup analyses in patients with interstitial lung disease (ILD), with and without O2 supplementation. The relationship between EtCO2 and PaCO2 was analyzed using Spearman's rank test and Bland-Altman analysis.
resultsA total of 100 patients were registered in this study. There was a moderate correlation between EtCO2 and PaCO2 (rho = 0.41). The Bland-Altman plot showed that the mean bias was 0.32 mmHg (95% CI: -1.28 to 1.92), the limits of agreement (LOA) were -15.48 and 16.13 mmHg, and the percent error was 38.49%. The LOA in patients with ILD were -15.12 and 13.75 mmHg. In patients with O2 supplementation, the mean bias was greater, and the LOA were wider than in those without O2 supplementation (mean bias: 7.17 vs. -1.18 mmHg, respectively; LOA: -14.29 and 28.62 mmHg vs. -13.82 and 11.46 mmHg, respectively).
conclusionIn the clinical setting, the relationship between EtCO2 and PaCO2 was poor in patients with respiratory disease, especially in those receiving O2 supplementation, compared with that reported in previous studies. It may be difficult to precisely estimate PaCO2 in patients with respiratory disease based on measurements of EtCO2.
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Registered trials
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