Hahn C N, Mayhew I G, Washbourne J R
Animal Health Trust, Newmarket, United Kingdom.
J Vet Intern Med. 1998 Jul-Aug;12(4):310-2. doi: 10.1111/j.1939-1676.1998.tb02127.x.
Lateral thoracic nerve reflex latencies values were measured in ponies using a simple, non-invasive technique. The reflex was elicited using an external triggering hammer attached to an electrodiagnostic unit. The resulting evoked, compound muscle action potentials were recorded with electrodes, which were placed over the 6th ribs or 11th rib level with the axilla. Two superimposed repeats of 4 signal-averaged sweeps of 50 or 100 milliseconds were recorded and the estimated reflex pathway was measured for each subject in order to calculate the reflex latencies and latency velocities. Mean left and right 6th rib peak latencies were not significantly different from each other (P = .609), but left 6th rib latencies were shorter than those recorded from the 11th rib (P < .0001), substantiating the existence of an indirect (central) pathway to the reflex. The calculated left and right 6th rib latency velocities were not significantly different from each other (P = .58) but left 6th rib latency velocities were different from left 11th rib (P = .009). The calculated latency velocities were within the broad range for corticospinal tract motor conduction velocities and comparable to magnetic motor evoked latency velocities. The use of lateral thoracic reflex latency measurements to objectively identify the site of spinal cord lesions is discussed.
采用一种简单的非侵入性技术测量了小马的胸外侧神经反射潜伏期值。使用连接到电诊断设备的外部触发锤诱发反射。用放置在第6肋骨或腋窝水平第11肋骨处的电极记录由此产生的诱发复合肌肉动作电位。记录了两个叠加的重复，每个重复包含4次50或100毫秒的信号平均扫描，并测量了每个受试者的估计反射通路，以计算反射潜伏期和潜伏期速度。左侧和右侧第6肋骨的平均峰值潜伏期彼此无显著差异（P = 0.609），但左侧第6肋骨的潜伏期短于第11肋骨记录的潜伏期（P < 0.0001），证实了存在通向该反射的间接（中枢）通路。计算出的左侧和右侧第6肋骨潜伏期速度彼此无显著差异（P = 0.58），但左侧第6肋骨潜伏期速度与左侧第11肋骨不同（P = 0.009）。计算出的潜伏期速度在皮质脊髓束运动传导速度的广泛范围内，且与磁运动诱发潜伏期速度相当。讨论了使用胸外侧反射潜伏期测量来客观识别脊髓损伤部位的问题。
