Background Tissue oximeters are not interchangeable. Two instruments with sensors dedicated to preterm infants—INVOS 5100C and Nonin SenSmart X-100—have not yet been compared. Methods By measuring cerebral oxygenation in ten preterm infants with spontaneous apneic episodes defined by pulse oximeter readings (SpO 2 ) below 80%, as well as tissue oxygenation during vascular occlusion on the forearm of ten adults, simultaneously we compared performance in the hypoxic range. Results We found the mean conversion equations to be StO 2,SenSmart X-100 = 0.34 × StO 2,INVOS 5100C + 44.8% during apnea in infants and StO 2,SenSmart X-100 = 0.59 × StO 2,INVOS 5100C + 34.4% during vascular occlusion. The individual regressions displayed large and statistically significant variations in both infants and adults. In three infants the INVOS sensor showed very little reaction to decreases in SpO 2 . Conclusions These findings confirm that different NIRS devices give very different estimates when the oxygenation is low. The large variation when compared to SpO 2 suggest that the sensor placement is very important in preterm infants.

中文翻译：

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INVOS 5100C 和 Nonin SenSmart X-100 血氧仪在自发性呼吸暂停早产儿中的性能比较

背景 组织血氧计不可互换。两种带有专用于早产儿的传感器的仪器——INVOS 5100C 和 Nonin SenSmart X-100——尚未进行比较。方法 通过测量 10 名患有自发性呼吸暂停发作的早产儿的脑氧合，这些自发性呼吸暂停发作定义为脉搏血氧仪读数 (SpO 2 ) 低于 80%，以及 10 名成人前臂血管闭塞期间的组织氧合，同时我们比较了缺氧范围内的表现。结果 我们发现婴儿呼吸暂停期间的平均转换方程为 StO 2,SenSmart X-100 = 0.34 × StO 2,INVOS 5100C + 44.8% 和 StO 2,SenSmart X-100 = 0.59 × StO 2,INVOS 5100C + 34.8%在血管闭塞期间。个体回归在婴儿和成人中均显示出巨大且具有统计显着性的差异。在三个婴儿中，INVOS 传感器对 SpO 2 的降低几乎没有反应。结论 这些发现证实，当氧合低时，不同的 NIRS 设备给出非常不同的估计。与 SpO 2 相比的较大变化表明传感器放置在早产儿中非常重要。