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Method of evading the overshoot phenomenon of transcutaneous P(CO2) measurement at the ear lobe

机译：避免耳垂经皮P（CO2）测量过冲现象的方法

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BACKGROUND: Kagawa et al. confirmed the overshoot of transcutaneous P(CO2) (Ptc(CO2)) during the early stage of measurement with Ptc(CO2) monitor (TOSCA, Linde Medical Sensors AG, Basel, Switzerland). We examined the method to evade this phenomenon. METHODS: Eight adult patients under general anesthesia were examined. Two probes were mounted each on the left and right ear lobes after constant end expiratory P(CO2) had been obtained for ten to fifteen minutes. One P(CO2) probe was set at 42 degrees C. Another one was set at 45 degrees C for the first 15 minutes and then decreased to 42 degrees C. RESULTS: With the probe heated at 42 degrees C, overshoot was observed in 5 out of 8 cases, the peak of which is 44 +/- 5.5 mmHg at 8.2 +/- 1.1 minutes and then these values went down to 39 +/- 4.0 mmHg at 19 +/- 1.3 minutes and stayed stable. Probes heated at 45 degrees C and placed on the opposite side did not show this phenomenon and were stabilized at 5 +/- 0.9 minutes. CONCLUSIONS: With this apparatus, we found that it is effective to avoid overshoot to heat the probe at 45 degrees C and to change at 42 degrees C after 15 minutes.
机译：背景：香川等。证实在使用Ptc（CO2）监测器（TOSCA，瑞士巴塞尔的Linde Medical Sensors AG）进行测量的早期，经皮P（CO2）（Ptc（CO2））的过冲。我们研究了避免这种现象的方法。方法：对八名成人全麻患者进行了检查。在获得十到十五分钟的恒定终末呼气P（CO2）之后，分别在左右耳垂上安装两个探头。将一个P（CO2）探针设置为42摄氏度。在开始的15分钟内将另一个P（CO2）探针设置为45摄氏度，然后降至42摄氏度。结果：在将探针加热到42摄氏度的情况下，观察到5在8例患者中，其峰值在8.2 +/- 1.1分钟时为44 +/- 5.5 mmHg，然后在19 +/- 1.3分钟时降至39 +/- 4.0 mmHg，并保持稳定。加热到45摄氏度并放在相对侧的探针未显示此现象，并稳定在5 +/- 0.9分钟。结论：使用该设备，我们发现避免过冲将探头加热到45摄氏度并在15分钟后改变到42摄氏度是有效的。

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