Purpose: To examine the efficacy of antagonism of rapacuronium-, mivacurium-, rocuronium- and cisatracurium-induced neuromuscular block at the laryngeal adductors (LA).
Methods: One hundred four patients were randomly assigned to one of eight study groups. They either received rapacuronium 1.5 mg x kg(-1), mivacurium 0.25 mg x kg(-1), rocuronium 0.9 mg x kg(-1) or cisatracurium 0.15 mg x kg(-1). Patients in each treatment group either received edrophonium (0.5 mg x kg(-1)) at 10% recovery of the first twitch (T1) of train-of-four (TOF) at the LA or were allowed to recover spontaneously from neuromuscular block. The effect of antagonism on speed of recovery of neuromuscular function at the LA was evaluated.
Results: The time to recovery to a TOF ratio of 0.9 at the LA, when compared to the spontaneous recovery group, was significantly shortened by the administration of edrophonium in patients receiving rapacuronium [19.2 +/- 7.8 vs 26.2 +/- 4.9 (mean +/- SD) min], rocuronium (24.7 +/- 14.3 vs 44.4 +/- 13.0 min) and cisatracurium (24.2 +/- 5.7 vs 35.1 +/- 7.6 min). Edrophonium administration did not shorten complete recovery from mivacurium-induced block (15.7 +/- 8.0 vs 17.6 +/- 6.1 min).
Conclusion: Recovery from rapacuronium-, rocuronium- or cisatracurium- induced neuromuscular block to a TOF ratio of 0.9 as measured at the LA was shortened by the administration of edrophonium, when compared to spontaneous recovery.