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  • Title: Onset and recovery of atracurium and suxamethonium-induced neuromuscular blockade with simultaneous train-of-four and single twitch stimulation.
    Author: Curran MJ, Donati F, Bevan DR.
    Journal: Br J Anaesth; 1987 Aug; 59(8):989-94. PubMed ID: 3651281.
    Abstract:
    Single twitch and train-of-four stimulation were applied at 0.08 Hz to each ulnar nerve and the force of contraction of the adductor pollicis was recorded during onset of and recovery from neuromuscular blockade by suxamethonium 1 mg kg-1 or atracurium 0.4 mg kg-1. Times to 90% first twitch blockade of train-of-four were (mean +/- SEM) 0.82 +/- 0.08 and 1.98 +/- 0.18 min for suxamethonium and atracurium, respectively, compared with times to 90% single twitch blockade of 1.00 +/- 0.07 and 3.35 +/- 0.37 min, respectively (P less than 0.05 in both cases). Apparent onset time also depended on how long train-of-four stimulation had been applied before injection of atracurium. The mode of stimulation had little effect on time to 10% recovery. The results are consistent with stimulation-induced augmentation in muscle blood flow, which increased delivery of the drug to the neuromuscular junction.
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