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Masseter Muscle Rigidity (MMR)

Anesthesia Implications

Clinically reviewed by anesthesia providers · Updated

Malignant Hyperthermia RiskAvoid SuccinylcholineDifficult AirwayHyperkalemiaHyperthermiaArrhythmiasRenal DysfunctionRhabdomyolysis

Pathophysiology

Masseter muscle rigidity (MMR) is jaw muscle tightness following a dose of succinylcholine while the limbs stay flaccid — the classic "jaws of steel." Presentation runs a spectrum from a merely tight...

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