title: Improved non-invasive total haemoglobin measurements after in-vivo adjustment.
abstract: We hypothesised that an in-vivo adjustment method and/or a newer sensor would increase the accuracy of non-invasive and continuous haemoglobin monitoring (SpHb) measurements. Two sensors, the R1-25 and R2-25a (the newer version), were used with laboratory total haemoglobin concentration (tHb) values simultaneously recorded. In-vivo adjusted SpHb (AdHb) was calculated by a simple formula: AdHb = SpHb - (1(st) SpHb - 1(st) tHb). The correlation coefficients between SpHb (or AdHb) and tHb were compared: SpHb in both sensors correlated strongly with tHb (p < 0.0001). In-vivo adjustment improved the correlation coefficient between SpHb and tHb from 0.86 to 0.95 for the R1-25 and from 0.83 to 0.93 for the R2-25a. There was no difference between the R1-25 and R2-25a sensors. The in vivo adjustment method improved the accuracy of SpHb measurements in both sensors.
authors.affiliation: Department of Anesthesiology, Sapporo Medical University School of Medicine, Sapporo, Hokkaido, Japan.
authors.forename: R
authors.initials: R
authors.lastname: Miyashita
authors.forename: N
authors.initials: N
authors.lastname: Hirata
authors.forename: S
authors.initials: S
authors.lastname: Sugino
authors.forename: M
authors.initials: M
authors.lastname: Mimura
authors.forename: M
authors.initials: M
authors.lastname: Yamakage
mesh_terms: D004867:Equipment Design; D005260:Female; D006452:Hemoglobinometry / Q000295:instrumentation* / Q000379:methods*; D006801:Humans; D008297:Male; D008875:Middle Aged; D016343:Monitoring, Intraoperative / Q000295:instrumentation* / Q000379:methods*; D010092:Oximetry / Q000295:instrumentation / Q000379:methods; D015203:Reproducibility of Results