• Paulo A Germano-Filho, Ismar L Cavalcanti, Angelo J Q R Micuci, Luis G C Velarde, Hans D de Boer, and Nubia Verçosa.
• Department of Surgery, Anesthesiology, Surgical Sciences Postgraduate Program, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil; Department of General and Specialized Surgery, Anesthesiology, Universidade Federal Fluminense, Niterói, Brazil. Electronic address: pauloalipio1976@gmail.com.
• J Clin Anesth. 2023 Oct 1; 89: 111186111186.

Study ObjectiveThe current study tested the hypothesis that magnesium sulfate after reversal with sugammadex causes recurarization.DesignA single-center, prospective, randomized, double-blind, controlled trial.SettingTerciary care hospital in Rio de Janeiro, Brazil.PatientsIncluded 60 patients undergoing for elective otolaryngological surgery.InterventionsAll patients received total intravenous anesthesia and a single dose of rocuronium (0.6 mg/kg). In 30 patients, the neuromuscular blockade was reversed with sugammadex (4 mg/kg) at the reappearance of one or two posttetanic counts (deep-blockade series). In 30 other patients, sugammadex (2 mg/kg) was administered at the reappearance of the second twitch of the train-of-four (moderate-blockade series). After the normalized train-of-four ratio recovered to ≥0.9, the patients in each series were randomized to receive intravenous magnesium sulfate (60 mg/kg) or placebo for 10 min. Neuromuscular function was measured by acceleromyography.MeasurementsThe primary outcome was the number of patients who exhibited recurarization (normalized train-of-four ratio < 0.9). The secondary outcome was rescue with an additional dose of sugammadex after 60 min.Main ResultsIn the deep-blockade series, a normalized train-of-four ratio < 0.9 occurred in 9/14 (64%) patients receiving magnesium sulfate and 1/14 (7%) receiving placebo, RR 9.0 (95% CI: 62-1.30), and (p = 0.002), with four rescues with sugammadex. In the moderate-blockade series, neuromuscular blockade recurred in 11/15 (73%) patients receiving magnesium sulfate and in 0/14 (0%) receiving placebo (p < 0.001), with two rescues. The absolute differences in recurarization were 57% and 73% in the deep-blockade and moderate-blockade, respectively.ConclusionsSingle-dose magnesium sulfate led to a normalized train-of-four ratio < 0.9, 2 min after recovery from rocuronium-induced deep and moderate neuromuscular blockade using sugammadex. Additional sugammadex reversed prolonged recurarization.Copyright © 2023 The Authors. Published by Elsevier Inc. All rights reserved.

20 keywords...

hide…