[Arteriovenous difference in O2 content, pulmonary venous O2 saturation, cardiac index: are they equivalent in cardiac surgery?].
OBJECTIVE
To study the concordance of cardiac index (CI), mixed venous oxygen saturation (SvO(2)) and the arterial-mixed venous O(2) content difference, i.e.: C(a-v)O(2), postoperatively to cardiac surgery. We hypothesized that significant discrepancies would be measurable between C(a-v)O(2) and SvO(2), and CI, because the latter two indices encompass less metabolic components than the former.


METHODS
Analysis of variables collected as part of routine care.


METHODS
Eighty anesthetized patients receiving mechanical ventilation after heart surgery.


RESULTS
Using linear regression of SvO(2) versus C(a-v)O(2) (Reg 1) and CI versus C(a-v)O(2) (Reg 2), respectively we found that CI=2.2 L min(-1)m(-2) and SvO(2)=70% were equivalent to C(a-v)O(2)=5 ml/100ml. The error reflected by the vertical scatter of points around the regression line, once normalized was 3.24 times greater in Reg 2 than in Reg 1.


CONCLUSIONS
The correspondence of CI, SvO(2) and C(a-v)O(2) values observed in a population of patients studied immediately after scheduled heart surgery match those reported in critically ill patients. SvO(2) and furthermore CI induced a sizeable scatter of points around regression line. Accordingly, they appear as a lesser estimate of the flow/metabolism balance that may at best be inferred from C(a-v)O(2).
Pottecher
J
J
Pôle d'anesthésie-réanimation, CHU d'Angers, 49933 Angers cedex 9, France.
Belii
A
A
Huntzinger
J
J
Chausseret
L
L
Soltner
C
C
Beydon
L
L
D000368:Aged; D001158:Arteries; D001830:Body Surface Area; D002302:Cardiac Output; D006348:Cardiac Surgical Procedures; D005260:Female; D006801:Humans; D008297:Male; D010100:Oxygen / Q000097:blood / Q000378:metabolism*; D011184:Postoperative Period; D011667:Pulmonary Veins; D014680:Veins
D010100:Oxygen