Kobayashi K, et al. - Experts gauged the significance of a change in latency in monitoring of transcranial muscle-action potential (Tc-MsEP) waveforms. Reduction of false positives and increase of positive predictive value (PPV) in Br(E)-MsEP monitoring could be led by the combined use of latency and amplitude. A sensitivity of 86%, specificity of 98%, and a false positive rate of 2%, and PPV 86% was demonstrated by a combination of a decrease in amplitude of 70% or more from baseline and a delay in latency of 10% or more from baseline.