目的:为四极建立的腰椎屈曲松弛(RF)测试获得新的截止点(CP)(e。)电极,来自双极器件已经定义的值。
方法:研究样本包括47例因下腰痛(DL)而暂时残疾的患者。通过等距测力测试对它们进行了评估,运动学测试和FR现象的评估。提出了两个具有ROC曲线的实验。第一,47名患者连续使用两种类型的电极进行射频测试,使用e.双极已知的截止点(CP)(2.49μV)。在第二个,用e.e.四极记录了17名患者的EMG数据,进行了DeLong检验,比较了一方面构建的2条ROC曲线,通过从测力和运动学测试中对样品进行分类,另一方面,通过用双极肌电图值对它们进行分类。
结果:共有34名患者充分完成了第一次实验的评估,17名患者完成了第二次实验的评估。第一项研究显示了1.2μV的截止点,AUC为87.7%;灵敏度为84.2%,特异性为80%。第二个显示对于e.双极的PC为1.21μV(AUC87.5%),对于e.四极的值为1.43(AUC82.5%),DeLong测试在两条曲线之间没有显著差异(p>0.4065)。
结论:使用ROC曲线的验证方法使得有可能以实用的方式获得用于RF测试的新PC,只需同时对同一组患者进行两项测试,直到获得有意义的样本。
OBJECTIVE: To obtain a new cut-off point (CP) for a lumbar flexion-relaxation (RF) test established with tetrapolar (e.) electrodes, from values already defined with bipolar devices.
METHODS: The study sample consists of 47 patients in a situation of temporary disability due to low back pain (DL). They were evaluated by means of an isometric dynamometry test, a kinematic test and an assessment of the FR phenomenon. Two experiments with ROC curves are proposed. The first, with 47 patients who consecutively performed the RF test with both types of electrodes, using the cut-off point (CP) known for the e. bipolar (2.49μV). In the second, with the EMG data recorded with e. tetrapolar in 17 patients, a DeLong test was performed that compares the 2 ROC curves that were constructed on the one hand, by classifying the sample from dynamometry and kinematic tests, and on the other, by classifying them with the bipolar EMG values.
RESULTS: A total of 34 patients adequately completed the evaluations of the first experiment and 17 patients the second. The first study shows a cut-off point of 1.2μV, with an AUC of 87.7%; Sensitivity 84.2% and Specificity 80%. The second shows a PC for e. bipolars of 1.21μV (AUC 87.5%) and for e. tetrapolar values of 1.43 (AUC 82.5%) with a DeLong test without significant differences between both curves (p>0.4065).
CONCLUSIONS: The validation methodology with ROC curves has made it possible to obtain a new PC for the RF test in a practical way, simply by simultaneously performing both tests on the same group of patients until a significant sample is obtained.