title: In vitro performance of a new non-invasive extracorporeal saturation monitor.
abstract: 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 < 0.001), lower haemoglobin levels (p = .002) and lower temperatures (p = 0.013). The mean (SD) haemoglobin concentration was 15.4 (0.6) when recorded by the M3 monitor, compared to 15.4 (0.5) g.dl(-1) measured by the blood gas analyser The M3 monitor compares favourably with the gold standard of the blood gas analyser and has the advantage of giving a continuous reading. You can respond to this article at http://www.anaesthesiacorrespondence.com.
authors.affiliation: Consultant Anaesthetist, Alexandra Hospital, Redditch, UK.
authors.forename: D H
authors.initials: DH
authors.lastname: Bailey
authors.forename: E J
authors.initials: EJ
authors.lastname: da Silva
authors.forename: T H
authors.initials: TH
authors.lastname: Clutton-Brock
mesh_terms: D001784:Blood Gas Analysis / Q000295:instrumentation*; D002315:Cardiopulmonary Bypass / Q000295:instrumentation*; D003627:Data Interpretation, Statistical; D005112:Extracorporeal Circulation; D006454:Hemoglobins / Q000032:analysis; D006801:Humans; D016014:Linear Models; D010100:Oxygen / Q000097:blood; D015203:Reproducibility of Results; D013696:Temperature
chemical_list: D006454:Hemoglobins; D010100:Oxygen