Kim J M, LaSalle A D, Parmley R T
Anesth Analg. 1977 May-Jun;56(3):352-5. doi: 10.1213/00000539-197705000-00007.
During recovery from spinal and epidural block, the progressive reduction of digital blood flow is regarded as evidence of sympathetic recovery of the extremity. This was demostrated by the decreasing amplitude of a digital pulse-wave (photoelectric plethysmographic) recording. As the level of analgesia regressed to T8-11 following spinal or epidural block, the toe pulse-wave amplitudes began to decrease. In the presence of good motor and sensory block in the lower extremity with low spinal or epidural anesthesia (level of analgesia T-11 or below), the clinical or photoeletric plethysmographic evidence of sympathetic denervation was minimal or absent. According to these findings, the authors postulate that some preganglionic sympathetic fibers which conduct sympathetic stimulation to the lower extremity originate at spinal cord segments T-10 or above.
在脊髓和硬膜外阻滞恢复过程中，手指血流量的逐渐减少被视为肢体交感神经恢复的证据。这通过手指脉搏波（光电体积描记法）记录幅度的降低得以证明。随着脊髓或硬膜外阻滞后镇痛平面退至T8 - 11，趾脉搏波幅度开始下降。在低位脊髓或硬膜外麻醉（镇痛平面T - 11或以下）时下肢存在良好的运动和感觉阻滞的情况下，交感神经去神经支配的临床或光电体积描记法证据极少或不存在。根据这些发现，作者推测一些将交感神经刺激传导至下肢的节前交感神经纤维起源于脊髓T - 10节段或以上。
