硬膜外为啥要做心电图

Epidural ECG technique: 

(a)Can be used with neuromuscular blockade. 

(b)Local anaesthetics in the epidural space augment epidural stimulation. 

(c)The signal from catheter tip is compared with the signal from skin surface. 

(d)T wave changes are seen as the catheter approaches the thoracic region. 

(e)Intrathecal placement is indicated by the loss of the trace. 

21(a) F  (b) F (c) T (d) F (e) F 

The technique cannot be reliably performed if any significant clinical neuromuscular blockade is 

present. Amplitude of QRS increase as resulting electrode comes closer to thoracic region. The 

amplitude of QRS is smaller if catheter is in lumbar or sacral region. Intrathecal catheter placement cannot be picked by epidural ECG technique. 

硬膜外心电图技术：（a）可用于神经肌肉阻滞。（b）硬膜外腔局部麻醉增强硬膜外刺激。（c）导管尖端的信号与皮肤表面的信号进行比较。（d）当导管接近胸部时，T波改变。（e）鞘内放置是指痕迹消失。21（a）f（b）f（c）t（d）f（e）f如果存在任何明显的临床神经肌肉阻滞，则该技术不能可靠地进行。随着电极靠近胸部，qrs波幅增大。当导管位于腰骶部时，qrs波幅较小。硬膜外心电图技术不能选择鞘内置管