title: [Arteriovenous difference in O2 content, pulmonary venous O2 saturation, cardiac index: are they equivalent in cardiac surgery?].
abstract: 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).
authors.affiliation: Pôle d'anesthésie-réanimation, CHU d'Angers, 49933 Angers cedex 9, France.
authors.forename: J
authors.initials: J
authors.lastname: Pottecher
authors.forename: A
authors.initials: A
authors.lastname: Belii
authors.forename: J
authors.initials: J
authors.lastname: Huntzinger
authors.forename: L
authors.initials: L
authors.lastname: Chausseret
authors.forename: C
authors.initials: C
authors.lastname: Soltner
authors.forename: L
authors.initials: L
authors.lastname: Beydon
mesh_terms: 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
chemical_list: D010100:Oxygen