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Revista Brasileira de Anestesiologia

Print version ISSN 0034-7094

Abstract

MARIA, Luís Fernando Rodrigues; TARDELLI, Maria Angela  and  RODRIGUES, Rita de Cássia. Effect of atracurium on pancuronium-induced neuromuscular block recovery. Rev. Bras. Anestesiol. [online]. 2004, vol.54, n.3, pp. 311-318. ISSN 0034-7094.  http://dx.doi.org/10.1590/S0034-70942004000300004.

BACKGROUND AND OBJECTIVES: Additional neuromuscular blocker doses are in general needed during wall closing after abdominal surgeries. This study aimed at determining during partial pancuronium-induced neuromuscular block recovery, the effect of additional atracurium dose on spontaneous neuromuscular block recovery. METHODS: Participated in this study 30 patients divided in two groups: pancuronium group (n = 14) and atracurium group (n = 16). Neuromuscular function was continuously monitored by accelerometry of abductor pollicis muscle using TOF to supramaximally stimulate ulnar nerve. Anesthesia was induced with propofol, fentanyl and 0.08 mg.kg-1 pancuronium, and was maintained with 60% N2O in oxygen and 0.5% isoflurane expired concentration. When T1 returned to 25% of control, 0.025 mg.kg-1 pancuronium or 0.20 mg.kg-1 atracurium were administered to pancuronium or atracurium group, respectively. Time for spontaneous T1 recovery = 10%, 25%, 75% of recovery index (RI 25-75%) and time to T4/T1 equal 0.8 after complementary dose, were recorded. RESULTS: There were no differences between groups on T1 spontaneous recovery to 10% (45.00 ± 15.50 vs. 49.69 ± 9.41), 25% (61.64 ± 18.58 vs. 64.25 ± 12.51) and 75% (94.00 ± 28.52 vs. 84.69 ± 16.50). Recovery index (RI 25-75%) and time to T4/T1= 0.8 were shorter in the atracurium group. CONCLUSIONS: In this study, atracurium complementation has made no difference in initial spontaneous recovery of pancuronium-induced neuromuscular block, but has decreased total recovery time in 20%.

Keywords : MONITORING [neuromuscular function]; NEUROMUSCULAR BLOCKERS [Non-depolarizing]; NEUROMUSCULAR BLOCKERS [atracurium, pancuronium].

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