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Masseter spasm after succinylcholine administration.

Michelle Gill1, Kimberlie Graeme, Kristan Guenterberg

  • 1Department of Emergency Medicine, Loma Linda University School of Medicine, Medical Center, 11234 Anderson Street, PO Bpx 2000, Room A-108, Loma Linda, CA 92354, USA.

The Journal of Emergency Medicine
|July 21, 2005
PubMed
Summary
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Succinylcholine can cause masseter spasm, a rare but serious condition sometimes called "jaws of steel." Anesthesia providers must be prepared for this adverse event during rapid sequence intubation.

Area of Science:

  • Anesthesiology
  • Pharmacology

Background:

  • Succinylcholine is a common neuromuscular blocking agent used in rapid sequence intubation.
  • Masseter spasm is a potential adverse effect of anesthetic agents.

Observation:

  • A 20-year-old woman experienced masseter spasm following succinylcholine administration.
  • This condition is colloquially known as "jaws of steel".

Findings:

  • Succinylcholine-induced masseter spasm is an uncommon complication.
  • Masseter spasm can be an early sign of malignant hyperthermia.

Implications:

  • Awareness and preparedness are crucial for managing succinylcholine-induced masseter spasm.
  • Early recognition of masseter spasm is vital for patient safety during anesthesia.

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