Fig. 2From: Unilateral abnormality of initial motor-evoked potential in the upper limb detected during lumbar spine surgery: a case reportInitial transcranial electrical stimulation motor-evoked potential. The left APB exhibited lower amplitude (0.263 mV) and prolonged latency (34.8 ms), whereas the right APB showed normal values of these parameters (1.76 mV and 21.7 ms, respectively). The ideal imaginary line indicated that the left APB had a significantly prolonged latencyBack to article page