Premium
Improved non‐invasive total haemoglobin measurements after in‐vivo adjustment
Author(s) -
Miyashita R.,
Hirata N.,
Sugino S.,
Mimura M.,
Yamakage M.
Publication year - 2014
Publication title -
anaesthesia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.839
H-Index - 117
eISSN - 1365-2044
pISSN - 0003-2409
DOI - 10.1111/anae.12681
Subject(s) - in vivo , correlation coefficient , medicine , biomedical engineering , mathematics , statistics , biology , microbiology and biotechnology
Summary 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 ( tH b) values simultaneously recorded. In‐vivo adjusted SpHb (AdHb) was calculated by a simple formula: AdHb = SpHb − (1 st SpHb − 1 st tH b). The correlation coefficients between SpHb (or AdHb) and tH b were compared: SpHb in both sensors correlated strongly with tH b (p < 0.0001). In‐vivo adjustment improved the correlation coefficient between SpHb and tH b 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.