%0 Randomized Controlled Trial
%T Recurarization with magnesium sulfate administered after two minutes sugammadex reversal: A randomized, double-blind, controlled trial.
%A Germano-Filho PA
%A Cavalcanti IL
%A Micuci AJQR
%A Velarde LGC
%A de Boer HD
%A Verçosa N
%J J Clin Anesth
%V 89
%N 0
%D 2023 10 30
%M 37393856
%F 9.375
%R 10.1016/j.jclinane.2023.111186
%X The current study tested the hypothesis that magnesium sulfate after reversal with sugammadex causes recurarization.<BR>A single-center, prospective, randomized, double-blind, controlled trial.<BR>Terciary care hospital in Rio de Janeiro, Brazil.<BR>Included 60 patients undergoing for elective otolaryngological surgery.<BR>All 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.<BR>The 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.<BR>In 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.<BR>Single-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.