Accuracy assessment for three fiberoptic pulmonary artery catheters for SvO2 monitoring.
OBJECTIVE
To compare values of SvO2 obtained by reflectance spectrophotometry continuous monitoring with those obtained from blood samples measurements by transmission spectrophotometry (Co-Oximetry).


METHODS
Values of SvO2 recorded by three pulmonary artery catheters for continuous monitoring, SAT1, SAT2 and Oximetrix3 (OX3), were compared in a prospective manner to those measured on blood samples by a Co-Oximeter, using the statistical analysis of Bland and Altman.


METHODS
Adult intensive care unit in an University Hospital.


METHODS
37 patients admitted for acute respiratory failure and/or shock who required hemodynamic monitoring.


RESULTS
The bias (average under- or overestimation) was small for all comparative measurements: +1.3, -0.2 and +1.0 sat% for SAT1, SAT2 and OX3, respectively. However, limits of agreement were only acceptable for SAT2 (-8.3 to +7.9 sat%) and OX3 (-6.7 to +8.6 sat%), but not for SAT1 (-23.3 to +25.9 sat%). No significant drift during 24 h was found with the three catheters. However, in vitro calibration was only found acceptable for SAT2 and OX3. The results were not influenced by the numbers of wavelengths of the device (2 for SAT1 and SAT2, and 3 for OX3) nor did they correlate with any of the hemodynamic and biochemical variables tested.


CONCLUSIONS
For usual monitoring in the ICU, SAT2 and OX3, gave SvO2 values which are in acceptable agreement with SvO2 measured on blood samples by Co-Oximetry.
Armaganidis
A
A
Medical Intensive Care Unit, Cochin Port-Royal University Hospital, Paris, France.
Dhainaut
J F
JF
Billard
J L
JL
Klouche
K
K
Mira
J P
JP
Brunet
F
F
Dinh-Xuan
A T
AT
Dall'Ava-Santucci
J
J
D000368:Aged; D015982:Bias; D002407:Catheterization, Swan-Ganz / Q000295:instrumentation*; D004909:Erythrocyte Indices; D005336:Fiber Optic Technology; D006439:Hemodynamics; D006801:Humans; D008875:Middle Aged; D010092:Oximetry / Q000379:methods*; D010100:Oxygen / Q000097:blood*; D011446:Prospective Studies; D013053:Spectrophotometry / Q000379:methods
D010100:Oxygen