• 作者：J. Pottecher ; A. Belii ; J. Huntzinger ; L. Chausseret ; C. Soltner ; L. Beydon
• 关键词：Catheterization ; Swan– ; Ganz ; Monitoring ; Physiologic ; Cardiac surgical procedures ; Postoperative period ; Critical care ; Investigative ; Techniques
• 刊名：Annales Francaises d'Anesthesie et de Reanimation
• 出版年：2008
• 出版时间：November 2008
• 年：2008
• 卷：27
• 期：11
• 页码：957-961
• 全文大小：261 K

Objective

To study the concordance of cardiac index (CI), mixed venous oxygen saturation (SvO₂) and the arterial-mixed venous O₂ content difference, i.e.: C(a–v)O₂, postoperatively to cardiac surgery. We hypothesized that significant discrepancies would be measurable between C(a–v)O₂ and SvO₂, and CI, because the latter two indices encompass less metabolic components than the former.

Design

Analysis of variables collected as part of routine care.

Patients

Eighty anesthetized patients receiving mechanical ventilation after heart surgery.

Measurements and results

Using linear regression of SvO₂ versus C(a–v)O₂ (Reg 1) and CI versus C(a–v)O₂ (Reg 2), respectively we found that CI = 2.2 L min⁻¹ m⁻² and SvO₂ = 70 % were equivalent to C(a–v)O₂ = 5 ml/100 ml. 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, SvO₂ and C(a–v)O₂ values observed in a population of patients studied immediately after scheduled heart surgery match those reported in critically ill patients. SvO₂ 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)O₂.