Ishikawa S, Ohmi S, Nakazawa K, Makita K
Department of Anesthesiology and Critical Care Medicine, Tokyo Medical and Dental University, School of Medicine, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8519, Japan.
J Anesth. 2000;14(3):119-23. doi: 10.1007/s005400070017.
This study was undertaken to assess the clinical usefulness of a continuous intra-arterial blood gas (CIABG) monitoring system, Paratrend 7, during thoracic surgery.
A sensor of the CIABG monitoring system was inserted into the radial artery in 50 patients. During one-lung/differential lung ventilation, arterial blood samples for estimation of blood gases (ABG) were taken every 45-90 min or when clinically needed. The PCO(2), PO(2), and pH values displayed by the CIABG monitor were recorded prior to arterial blood sampling and were compared with the results of ABG analysis. The mean (bias) and the standard deviation (precision) of the differences were calculated from the data for each parameter.
Ninety-four blood samples were obtained. The correlation between CIABG and ABG measurements was strong for each parameter: r = 0.83 (PCO(2)), 0.89 (PO(2)), 0.74 (pH). The bias +/- precision between the two methods was 0.4 +/- 3.0 mmHg for PCO(2), -6 +/- 47 mmHg for PO(2), -1.2 +/- 27.4% for PO(2) and -0.01 +/- 0.04 for pH. For PO(2) values <150 mmHg, the bias +/- precision was 1 +/- 28 mmHg.
The agreement between CIABG and ABG measurements was better for PCO(2) and pH than for PO(2). The PO(2) value displayed on the CIABG monitor may not always be reliable during thoracic surgical procedures.
本研究旨在评估一种连续动脉血气（CIABG）监测系统——Paratrend 7在胸外科手术中的临床实用性。
将CIABG监测系统的传感器插入50例患者的桡动脉。在单肺/差异肺通气期间，每45 - 90分钟或临床需要时采集动脉血样本以测定血气（ABG）。在采集动脉血样本之前，记录CIABG监测仪显示的PCO₂、PO₂和pH值，并与ABG分析结果进行比较。根据每个参数的数据计算差异的平均值（偏差）和标准差（精密度）。
共获得94份血样。CIABG与ABG测量值之间在每个参数上的相关性都很强：r = 0.83（PCO₂），0.89（PO₂），0.74（pH）。两种方法之间PCO₂的偏差±精密度为0.4±3.0 mmHg，PO₂为 - 6±47 mmHg，PO₂为 - 1.2±27.4%，pH为 - 0.01±0.04。对于PO₂值<150 mmHg，偏差±精密度为1±28 mmHg。
CIABG与ABG测量值之间在PCO₂和pH方面的一致性优于PO₂。在胸外科手术过程中，CIABG监测仪显示的PO₂值可能并不总是可靠的。
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