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Canadian Journal of Anesthesia, Vol 29, 42-49, Copyright © 1982 by Canadian Anesthesiologists' Society

Masseter Spasm Induced by Succinylcholine in Children: Contracture Testing for Malignant Hyperthermia: Report of Six Cases

EUGENE H. FLEWELLEN 1 and THOMAS E. NELSON 1

1 Department of Anesthesiology, University of Texas Medical Branch, Galveston, Texas 77550, U.S.A.

We evaluated six boys who had developed isolated masseter muscle spasm following intravenous succinylcholine. All were receiving halothane by inhalation. In vitro muscle contracture tests utilizing halothane and caffeine were performed. Four of the six boys had contracture responses similar to those of malignant hyperthermia susceptible patients. Rigidity following succinylcholine should prompt the clinician to consider malignant hyperthermia but has been associated with other myopathic conditions as discussed.

Key Words: Malignant hyperthermia • Succinylcholine, Masseter spasm






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Copyright © 1982 by the Canadian Anesthesiologists' Society.