Using an ordinal measure of cutaneous sensitivity to intradermal injections of atracurium and vecuronium, 40 nonreacting subjects were compared with a group of 24 patients previously suffering life-threatening anaphylactoid reactions to other muscle relaxants. Enhanced cutaneous sensitivity to vecuronium was found in three, and to atracurium in two of the previously reacting group. With the exception of those showing abnormal reactivity, no significant difference was found in the distribution of cutaneous sensitivity in the control and reacting group. A concentration of vecuronium 8.75 times that of atracurium was required to produce an equivalent intradermal wheal response.
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