Ann Rehabil Med.  2012 Feb;36(1):126-132. 10.5535/arm.2012.36.1.126.

The Significance of Transcutaneous Continuous Overnight CO2 Monitoring in Determining Initial Mechanical Ventilator Application for Patients with Neuromuscular Disease

• Lee SK
• Kim DH
• Choi WA
• Won YH
• Kim SM
• Kang SW

• KMID: 2266790
• DOI: http://doi.org/10.5535/arm.2012.36.1.126

Abstract

OBJECTIVE
To reveal the significance of continuous transcutaneous carbon dioxide (CO2) level monitoring through reviewing cases which showed a discrepancy in CO2 levels between arterial blood gas analysis (ABGA) and continuous transcutaneous blood gas monitoring. METHOD: Medical record review was conducted retrospectively of patients with neuromuscular diseases who had started home mechanical ventilation between June 2008 and May 2010. The 89 patients underwent ABGA at the 1st hospital day, and changes to their CO2 level were continuously monitored overnight with a transcutaneous blood gas analysis device. The number of patients who initially appeared to show normal PaCO2 through ABGA, yet displayed hypercapnea through overnight continuous monitoring, was counted.
RESULTS
36 patients (40.45%) presented inconsistent CO2 level results between ABGA and continuous overnight monitoring. The mean CO2 level of the 36 patients using ABGA was 37.23+/-5.11 mmHg. However, the maximum and mean CO2 levels from the continuous monitoring device were 52.25+/-6.87 mmHg and 46.16+/-6.08 mmHg, respectively. From the total monitoring period (357.28+/-150.12 minutes), CO2 retention over 45 mmHg was detected in 198.97 minutes (55.69%).
CONCLUSION
Although ABGA only reflects ventilatory status at the puncturing moment, ABGA results are commonly used to monitor ventilatory status in most clinical settings. In order to decide the starting point of home mechanical ventilation in neuromuscular patients, continuous overnight monitoring should be considered to assess latent CO2 retention.

Keyword

Respiratory failure; Blood gas analysis; Transcutaneous blood gas monitoring; Mechanical ventilation

MeSH Terms

Blood Gas Analysis
Blood Gas Monitoring, Transcutaneous
Carbon Dioxide
Humans
Medical Records
Neuromuscular Diseases
Organothiophosphorus Compounds
Respiration, Artificial
Respiratory Insufficiency
Retention (Psychology)
Retrospective Studies
Ventilators, Mechanical
Carbon Dioxide
Organothiophosphorus Compounds

Figure

• 

  Fig. 1 These figures show an example of a patient's data from the transcutaneous blood gas monitoring device. (A) Table and (B) graph of a patient's data from continuous transcutaneous blood gas monitoring. The table shows mean, maximal PCO2 values and portions of PCO2 range, while the graph shows change in PCO2 level through overnight continuous monitoring.

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