Failure in measuring gas exchange in the ICU

Details

Serval ID
serval:BIB_8194F6EE24D3
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Failure in measuring gas exchange in the ICU
Journal
Chest
Author(s)
Bracco  D., Chiolero  R., Pasche  O., Revelly  J. P.
ISSN
0012-3692 (Print)
Publication state
Published
Issued date
05/1995
Volume
107
Number
5
Pages
1406-10
Notes
Journal Article --- Old month value: May
Abstract
OBJECTIVE: This study was performed on patients after coronary artery bypass surgery, and in healthy volunteers to assess discrepant oxygen consumption (VO2) measurement between indirect calorimetry and Fick methods. Further evaluations were performed to point out the technical failure. METHODS: In this prospective study, the VO2 was assessed in the patients using a commercial indirect calorimeter and the reverse Fick method. This calorimeter does not directly measure gas flow, but it assumes a constant preset flow. Bench testing of the calorimeter was performed in spontaneous and respirator mode using a reference calorimeter in healthy volunteers. RESULTS: An important overestimation of VO2 and carbon dioxide production (VCO2) of approximately 30% was found in both groups. The actual flow was lower than the preprogrammed value. This lead to spuriously high fractions of carbon dioxide and low fraction of oxygen. VCO2 and VO2, calculated with the overestimated gas flow value were overestimated, while respiratory quotient remained unchanged. Technical check-up revealed leaks in the mixing chamber and in the sampling lines. CONCLUSION: Indirect calorimetry is a useful clinical tool, but the investigator has to be very attentive to all potentially interfering factors and hazards.
Keywords
Blood Flow Velocity Calorimetry, Indirect/*instrumentation Carbon Dioxide/blood Coronary Artery Bypass Equipment Failure Humans Intensive Care Units Oxygen/blood *Oxygen Consumption Prospective Studies Pulmonary Circulation Pulmonary Gas Exchange
Pubmed
Web of science
Create date
24/01/2008 18:03
Last modification date
20/08/2019 15:41
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