Table 2. The sliding scale of warning criteria for brainstem auditory evoked potentials (BAEPs)

The sliding scale	The change of BAEPs (wave V)	Measures
Observation sign	Only latency prolongation (≥1 msec)	Notification & No surgical corrective measures
Warning sign	Latency prolongation (≥1 msec) + Amplitude decrement (≥50%)	Notification & Stop surgery, Rapid surgical corrective measures
Critical sign	Wave loss	Notification & Stop surgery, Rapid surgical corrective measures