TITLE

A nomogram to evaluate the arterial mixed venous oxygen saturation difference during cardiopulmonary bypass

AUTHOR(S)
Cavaliere, F.
PUB. DATE
January 1998
SOURCE
Perfusion;1998, Vol. 13 Issue 1, p45
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
A nomogram providing the arterial mixed venous haemoglobin saturation difference (SO2) corresponding to normal oxygen consumption (VO2) during cardiopulmonary bypass (CPB) was produced. Normal VO2 during CPB (95.8 20.1 ml/min/m2 at 37?C) was obtained from the literature. The nomogram computes the SO2 from the body surface, pump flow, blood haemoglobin and patient temperature; a table is also presented which supplies the SO2 ranges corresponding to VO2 mean 1 and 2SD. The nomogram was tested on 10 subjects undergoing CPB for myocardial revascularization. SO2 was determined by arterial and mixed venous blood oximetry 5, 20, and 35 min after the start of CPB. The measured SO2 was 27.1 7.2% while SO2 obtained from the nomogram was 24.9 14.0%, the difference was not statistically significant. Eighteen values (60%) were within the range corresponding to VO2 mean 1SD. One value was lower than the SO2 value corresponding to VO2 mean -: 2SD and was associated with the lowest value of blood haemoglobin. Two values were higher than the SO2 value corresponding to VO2 mean +2SD and were associated with inadequate muscle relaxation. By comparing measured SO2 values with those obtained by the nomogram and the table, anaesthesiologists and perfusionists can easily detect patients presenting abnormally low or high VO2 values.
ACCESSION #
4089146

 

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