ネコ腰髄出血により惹起される神経損傷を把握するための電気生理学的検査の有用性(内科学)

摘要

交通事故により腰髄出血が生じ, 両後肢麻痺を呈したネコ2症例に対して, F波, 運動神経伝導速度検査(MNCV), 脊髄誘発電位(SCEP)ならびに針筋電図検査(EMG)を実施した.F波, SCEPは事故後3日以内に異常を示した.MNCVおよびEMGは, 事故直後は正常であったが, 6あるいは8日目に異常を示した.複数の電気生理学的検査を繰り返し実施する事により, 神経損傷の進行を推察できることが示唆された.We conducted combined electrophysiological examinations including F-wave, motor nerve conduction velocity (MNCV), spinal cord-evoked potential (SCEP), and needle electromyography (EMG) in two cats involved in traffic accidents that consequently developed hind limb paralysis caused by lumbar hematomyelia. F-wave could no longer be elicited within 3 days after the accident, and the MNCV and compound muscle action potential (CMAP) amplitude decreased in a time-dependent manner, with CMAP no longer being evoked after 7 or 8 days. EMG showed abnormalities such as fibrillation and positive sharp waves after 6 to 8 days. These results suggest that such combined electrophysiological examinations may provide objective, quantitative data for motor nerve dysfunction in cats with lumbar hematomyelia.