Fig. 4. Values (mean ± SD) for twitch tension after an infusion of mivacurium are displayed for each of the two infusions. Some error bars are omitted for clarity. With placebo, recovery from infusion #2 was less (P < 0.05) than that after infusion #1 at 11–15 min. With neostigmine, recovery from infusion #2 was more (P < 0.05) than after infusion #1 at 4–14 min. With edrophonium, recovery from infusion #2 was more (P < 0.05) than after infusion #1 at 4–15 min.