Continuous central venous and pulmonary artery oxygen saturation monitoring in the critically ill.
OBJECTIVE
To compare the course of continuously measured mixed and central venous O(2) saturations in high-risk patients and to evaluate the impact of various factors that might interfere with reflection spectrophotometry.


METHODS
Prospective, descriptive study in the interdisciplinary ICU of a university hospital.


METHODS
32 critically ill patients with triple-lumen central vein catheters, including 29 patients requiring pulmonary artery catheterization.


METHODS
The accuracy of fiberoptic measurements was assessed by comparison to reference co-oximeter results at regular intervals. We examined the effect on measurement accuracy of physiological variables including hematocrit, hemoglobin, pH, temperature, and the administration of various solutions via central venous catheter. Continuous parallel measurements of SvO(2) and ScvO(2) were performed in patients with each type of catheters over a total observation time of 1097 h.


RESULTS
ScvO(2) values were more accurate and stable than in vitro oximeter measurements ( r=0.96 from 150 samples, mean difference 0.15%, average drift 0.10%/day) and was not significantly affected by synchronous infusion therapy or by changes in hematocrit, hemoglobin, pH, or temperature. ScvO(2) values closely paralleled SvO(2), whether measured in vitro ( r=0.88 from 150 samples) or in vivo ( r=0.81 from 395,128 samples) but averaged about 7+/-4 saturation percentage higher. ScvO(2) changed in parallel in 90% of the 1,498 instances in which SvO(2) changed more than 5% (over an average of 43 min).


CONCLUSIONS
Continuous fiberoptic measurement of central vein O(2) saturation has potential to be a reliable and convenient tool which could rapidly warn of acute change in the oxygen supply/demand ratio of critically ill patients.
Reinhart
Konrad
K
Department of Anesthesia and Intensive Care Medicine, Friedrich Schiller University, Erlanger Allee 101, 07747 Jena, Germany. konrad.reinhart@med.uni-jena.de
Kuhn
Hans-Jörg
HJ
Hartog
Christiane
C
Bredle
Donald L
DL
D018806:APACHE; D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002405:Catheterization, Central Venous; D016638:Critical Illness; D005260:Female; D005336:Fiber Optic Technology; D006801:Humans; D016014:Linear Models; D008297:Male; D008875:Middle Aged; D008991:Monitoring, Physiologic; D010092:Oximetry / Q000295:instrumentation*; D011446:Prospective Studies; D011651:Pulmonary Artery; D018709:Statistics, Nonparametric