A carotid arterial catheter was placed for blood gas analysis (model ABL5; Radiometer Inc., Copenhagen, Denmark) and inline measurement of systemic arterial pressure (TruWave™; Baxter Healthcare Corp., Irvine, CA, USA).
A carotid arterial catheter was placed for blood gas analysis (model ABL5; Radiometer Inc., Copenhagen, Denmark) and for inline measurement of the mean arterial pressure (TruWave™; Baxter Healthcare Corp., Irvine, CA, USA).
Arterial blood samples were taken 30 min after randomization and every hour for blood gas analysis (Ciba Corning Model 248 blood gas analyser, Corning Medical, Medfield, MA, USA).
The isotopic enrichment of [1-C]Phe and d5-Phe from the plasma free amino acid pool and from albumin was measured by gas chromatography mass spectrometry analysis (model 5973; Hewlett-Packard, Palo Alto, CA) in the electron impact ionization mode.
When multiple identical devices are used to collect and compare data from several measurement localities (e.g., each site having the same model gas analysis system), it is essential to test that each unit of the systems is not significantly biased and indeed produces comparable results (i.e., low inter-unit variability).
Besides direct state variables (i.e., biomass, glycerol, methanol, and ammonia), CER and OUR calculated from on-line exhaust gas analysis are included in the model.
Arterial blood gas analysis and pH (blood gas analyzer model Rapidlab 348; Bayer Vital GmbH, Fernwald, Germany) as well as glucose (Glukometer Elite XL, Bayer Vital GmbH, Fernwald, Germany) and lactate (Arkray Inc. European Office, Düsseldorf, Germany) were measured at least every 60 min.
In comparison, inter-system accuracy (validity), especially for gas analysis systems, typically compares only one model of an instrument against a quite different criterion/gold device, typically a Douglas Bag system (Douglas 1911).
Of the variables for arterial blood gas analysis, pH was the only variable included in the model, and the APACHE II score was excluded from the multivariate model because of collinearity with pH and creatinine.
Although two studies have reported data collected from multiple models of the same automated gas analysis system using the same subjects across each device.
The testing equipment consisted of a research-grade treadmill (Trackmaster, JAS, Model TMX42C, FullVision Inc, Newton, KS) and a Parvo gas analysis system (Parvo Medics, Sandy, UT).
