In vitro performance of a new non-invasive extracorporeal saturation monitor

摘要

A simulated cardiopulmonary bypass circuit was constructed in the laboratory to compare the accuracy and precision of a new non-invasive extracorporeal oxygen saturation monitor – the M3 monitor (Spectrum Medical LLP, Gloucester, UK) against the Siemens RAPIDLab? blood gas analyser (Siemens AG, Munich, Germany). Comparisons were made across a range of oxygen saturations and at different temperatures and different haemoglobin concentrations. Results showed that under all conditions, when recording oxygen saturation, the M3 monitor achieved a mean (SD) bias of ?0.9 (1.7)% with limits of clinical agreement of ?4.2 to 2.5. However, the difference between the two monitors was larger at lower saturation levels (p?