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Research ArticleOriginal Research

Reliability of Central Venous Blood Gas Values Compared With Arterial Blood Gas Values in Critically Ill Patients

Dong-Gon Hyun, Wonjun Ji, Jee Hwan Ahn, Dong Kyu Oh, Jin Won Huh, Sang-Bum Hong, Younsuck Koh and Chae-Man Lim
Respiratory Care May 2022, respcare.09732; DOI: https://doi.org/10.4187/respcare.09732
Dong-Gon Hyun
Department of Pulmonary and Critical Care Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea.
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Wonjun Ji
Department of Pulmonary and Critical Care Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea.
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Jee Hwan Ahn
Department of Pulmonary and Critical Care Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea.
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Dong Kyu Oh
Department of Pulmonary and Critical Care Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea.
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Jin Won Huh
Department of Pulmonary and Critical Care Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea.
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Sang-Bum Hong
Department of Pulmonary and Critical Care Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea.
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Younsuck Koh
Department of Pulmonary and Critical Care Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea.
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Chae-Man Lim
Department of Pulmonary and Critical Care Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea.
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  • For correspondence: [email protected]
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Abstract

BACKGROUND: Central venous blood gas (cVBG) values are correlated with arterial blood gas (ABG) values. However, the substitution of cVBG values for ABG values in critically ill patients remains uninvestigated. Thus, we investigated the reliability between cVBG and ABG values and sought to define the conditions that could improve the reliability of cVBG values as a substitute.

METHODS: We conducted a prospective comparison of 292 sets of cVBG values and ABG values from 82 subjects admitted to the medical ICU between October 2017–July 2018. Paired cVBG and ABG samples were collected daily during the first 5 d of ICU treatment and on days 8, 15, 22, and 29. Intraclass correlation coefficient (ICC) and Bland-Altman limits of agreement (LOA) were obtained.

RESULTS: The ICC between ABG and cVBG was 0.626 for pH, 0.696 for PCO2, 0.869 for bicarbonate, 0.866 for base excess, and 0.989 for lactic acid. Bland-Altman plots showed clinically unacceptable LOA between all parameters. Subgroup analysis indicated a significant increase in the ICCs of PCO2 in samples with mechanical ventilation (0.0574–0.735, P = .02) and central venous oxygen saturation (ScvO2) ≥ 70% (0.611–0.763, P = .008). After adjustment, the 95% LOA between ABG and cVBG was −0.06 to 0.07 for pH and −7.09 to 7.05 for PCO2 in mechanically ventilated subjects with ScvO2 ≥ 70%.

CONCLUSIONS: ABG and cVBG values showed clinically acceptable agreements and improved reliability in mechanically ventilated subjects with ScvO2 ≥ 70%. cVBG analysis may be a substitute for ABG analysis in mechanically ventilated patients once tissue perfusion is restored.

  • blood gas analysis
  • correlation of data
  • ICUs
  • mechanical ventilator
  • carbon dioxide
  • shock

Footnotes

  • Correspondence: Chae-Man Lim MD PhD, Department of Pulmonary and Critical Care Medicine, Asan Medical Center, University of Ulsan College of Medicine, 88 Olympic-ro 43-gil, Songpa-gu, Seoul 05505, Korea, Republic of Korea. Fax: 82-2-3010-6968. E-mail: cmlim{at}amc.seoul.kr
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Respiratory Care: 67 (8)
Respiratory Care
Vol. 67, Issue 8
1 Aug 2022
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Reliability of Central Venous Blood Gas Values Compared With Arterial Blood Gas Values in Critically Ill Patients
Dong-Gon Hyun, Wonjun Ji, Jee Hwan Ahn, Dong Kyu Oh, Jin Won Huh, Sang-Bum Hong, Younsuck Koh, Chae-Man Lim
Respiratory Care May 2022, respcare.09732; DOI: 10.4187/respcare.09732

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Reliability of Central Venous Blood Gas Values Compared With Arterial Blood Gas Values in Critically Ill Patients
Dong-Gon Hyun, Wonjun Ji, Jee Hwan Ahn, Dong Kyu Oh, Jin Won Huh, Sang-Bum Hong, Younsuck Koh, Chae-Man Lim
Respiratory Care May 2022, respcare.09732; DOI: 10.4187/respcare.09732
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Keywords

  • blood gas analysis
  • correlation of data
  • ICUs
  • mechanical ventilator
  • carbon dioxide
  • shock

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