Continuous SVO2 measurement and oxygen transport patterns in cardiac surgery patients
1984; Lippincott Williams & Wilkins; Volume: 12; Issue: 6 Linguagem: Inglês
10.1097/00003246-198406000-00012
ISSN1530-0293
AutoresC Schmidt, LAWRENCE P. FRANK, Sarah Forsythe, Fawzy G. Estafanous,
Tópico(s)Ultrasound in Clinical Applications
ResumoTwenty adult cardiac surgery patients with impaired ventricular function by contrast ventriculography at cardiac catheterization were monitored from before anesthesia until the time of extubation up to 12 h postoperatively. A thermodilution pulmonary artery catheter with fiberoptic channels for continuous measurement of mixed-venous oxygen saturation (SVO2) by reflection oximetry was substituted for the usual catheter. The SVO2 was recorded continuously along with blood pressure, cardiac filling pressures, and heart rate. Thermodilution cardiac output determinations were used to derive hemodynamic and oxygen transport indices. There was a consistently high and significant negative correlation (r = -.84) between SVO2 and the percentage of oxygen extracted from blood. Thus, SVO2 reflects oxygen extraction and continuous SVO2 provides continuous quantification of global oxygen extraction. None of the other oxygen transport variables including cardiac index showed significant correlation with SVO2. The oximetry system provides a continuous and reliable indication of mixed-venous blood oxygenation which is a continuous reflection of oxygen extraction.
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