Assessment of trending ability by polar plot methodology between central venous and mixed venous oxygen saturation which were measured concurrently by spectrophotometry

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  • 分光光度法で同時測定された中心静脈血酸素飽和度と混合静脈血酸素飽和度の極座標を用いた追随性の検討

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Objective: We studied the trending ability and the correlation between central venous oxygen saturation (ScvO2) and mixed venous oxygen saturation (SvO2); they were measured concurrently by spectrophotometry. The purpose of this study was to determine whether ScvO2 could be exploited as a hemodynamic monitor after the removal of a pulmonary artery catheter. Methods: After arrival at the ICU, we measured and recorded ScvO2 and SvO2 continuously. We selected the pairs of ScvO2 and SvO2, which showed a value of 1 or 2 on signal quality indicator, and examined the trending ability and the correlation between the two. Results: The data of 24 adult patients who underwent cardiac surgery were examined. As the result, the range of the coefficient of correlation was 0.12-0.85 and showed great dispersion between cases. And individual case had different bias. It was only 2 cases to have shown good trending ability. Conclusions: Since the correlation between ScvO2 and SvO2 were different by cases respectively and there were few cases showing good trending ability, we should regard ScvO2 as a hemodynamic index which was different from SvO2.

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