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Accuracy of Oxygen Partial Pressure Measurements: An In-Vitro Study

1983; EDP Sciences; Volume: 15; Issue: 4 Linguagem: Inglês

10.1051/ject/198315489

2969-8960

Gary D. Reeder, Andrew G. Hood,

Respiratory Support and Mechanisms

The accuracy of oxygen partial pressure (pO 2 ) analysis was examined in two commercially available systems, an IL 513 blood gas analyzer and a new in-line sensor from Orange Medical Instruments. Data was obtained with each system after equilibration of an in vitro test circuit with specially formulated tonometry gases. The response of each system was examined over a pO 2 range from 19 Torr to 400 Torr. The effect of hypothermia on analytical accuracy of each system was evaluated over a range of 37°C to 21.5°C. A high degree of temperature dependent error was found with analysis on an IL 513 system. This resulted in significant underestimation of true pO 2 under most conditions examined. In contrast, the in-line sensor was found to report significantly more accurate data with less temperature dependence.