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Title: Laboratory validation of the M-COVX metabolic module in measurement of oxygen uptake.
Austin Authors: Stuart-Andrews, C R;Peyton, Philip J ;Walker, T B;Cairncross, A D;Robinson, Gavin J B;Lithgow, B
Affiliation: Department of Anaesthesia, The Austin Hospital, Heidelberg, Victoria, Australia
Issue Date: 1-May-2009
Publication information: Anaesthesia and Intensive Care; 37(3): 399-406
Abstract: A practical method of breath-by-breath monitoring of metabolic gas exchange has previously been developed by GE Healthcare and can now be easily incorporated into existing anaesthetic and critical care monitoring (M-COVX). Previous research using this device has shown good accuracy and precision between the M-COVX measurements and a traditional measurement of gas uptake at the mouth and also against the reverse Fick method during cardiac surgery and critical care, but its accuracy in the paediatric situation and across a range of ventilatory settings awaits validation. We tested the M-COVX metabolic monitor in the laboratory comparing its measurement to a traditional Haldane transformation across a wide range of oxygen consumption values, from 50 ml/minute to just under 300 ml/minute, typical of those expected in anaesthetised adults and children. The M-COVX device showed acceptable accuracy with an overall mean bias of -3.3% (range -15.1 to +4.2%, P = 0.21). Excellent linearity was found, by y = 0.96x + 0.5 ml/minute, r = 0.99. The device showed acceptable robustness to ventilatory changes examined, including changes in respiratory rate, I:E ratio, FiO2 up to 75% and simulated spontaneous breathing. However any induced leak from around the simulated endotracheal tube caused a significant error in paediatric scenarios.
Gov't Doc #: 19499859
Journal: Anaesthesia and Intensive Care
Type: Journal Article
Subjects: Adolescent
Age Factors
Child, Preschool
Critical Care.methods
Equipment Design
Monitoring, Intraoperative.instrumentation
Monitoring, Physiologic.instrumentation
Oxygen Consumption
Pulmonary Gas Exchange
Reproducibility of Results
Respiration, Artificial.methods
Young Adult
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