硬脊膜外间隙阻滞对脉搏氧饱和度仪测定时间的影响

目的研究观察颈胸段和腰骶段硬脊膜外间隙阻滞对脉搏氧饱和度仪测定时间（PODT）的影响。方法选择33例ASA Ⅰ级和年龄16-40岁拟在硬脊膜外间隙阻滞下施择期外科手术的患者，根据硬脊膜外间隙阻滞的部位将患者分成两组：Ⅰ组，颈胸段硬脊膜外间隙阻滞（n=16）；Ⅱ组，腰骶段硬脊膜外间隙阻滞组（n=7）。应用Datex脉搏氧饱和度仪测定SpQ2，Ⅰ组和Ⅱ组患者的探头分别放置在食指或食趾。PODT的测定方法是在患者尽力摒气后吸入100％O2，在硬脊膜外间隙阻滞开始前5分钟和硬脊膜外间隙阻滞5、10、15、20、30和40分钟时分别测定PODT。结果在整个测定过程中，两组患者循环功能稳定。在硬脊膜外间隙阻滞之后，所有患者的PODT逐渐缩短，并在30分钟后基本趋于稳定。与对照值相比较，两组患者在硬脊膜外间隙阻滞后各测定时间的PODT均明显缩短（P〈0．01）。结论硬脊膜外间隙阻滞后PODT明显缩短。PODT可作为成功硬脊膜外阻滞的一个敏感指标。

The Effect of Epidural Blockade on Pulse Oximeter Detection Time

Objectives To determine the effects of cervicothoracic and lumbosacral epidural blocks on the pulse oximeter detection time (PODT). Methods Thirty-three healthy, ASA status I patients (age 16 to 41 years) ,undergoing elective surgery under epidural block, were included. On the basis of the epidural block sites, patients were divided into Group 1, including 16 subjects undergoing the cervicothoracic block, and Group 2, including 17 subjects receiving the lumbosacral epidural block. Arterial oxygen saturation (SpO2). Was measured by a Datex pulse oximeter. The pulse oximeter probe was attached to the index finger in Group 1 and to the index toe in Group 2, respectively. PODT was measured while breathing oxygen after breathing-holding. The PODT measurements were performed at 5 min prior to and 5,10,15,20,30, and 40 min after epidural blocks. Results Throughout the observation, the circulatory system was stable. PODT of all the patients were progressively decreased after epidural blocks, and tended to be stable 30 min after epidural blocks. As compared with control values, PODT was significantly shorter at each measurement point after epidural blocks. Conclusion PODT was significantly decreased after epidural blocks and might be as a sensitive indicator of successful epidural block