burst was stronger than that to the first) was determined by an observer blinded to the depth of neuromuscular block. In addition, the relationship between the train-of-four (TOF) ratio and DBS2, 3 ratio was established at varying depths of neuromuscular block (TOF ratio O. 04-1.00). Results: The probabilities of tactile detection of fade in response to DBSz3 were 100, 76, 15,9,3, O, respectively. Waxing in response to the DBSz3 was identified in O,6, 32, 84, and 98% of cases when the TOF ratios were 0.00 respectively. A close linear relationship existed between the TOF ratio and DBSz3 ratio (r = 0.96, P < 0.000001).