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Masseter muscle rigidity after vecuronium.

¹Department of Anaesthesia, Royal Surrey County Hospital, Guildford, UK.

European Journal of Anaesthesiology

|April 2, 1999

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Masseter muscle rigidity, a rare side effect of certain muscle relaxants, can occur in adults. While it may complicate airway management, it is unlikely to lead to malignant hyperthermia.

Area of Science:

Anesthesiology
Pharmacology

Background:

Masseter muscle rigidity following suxamethonium, often seen in children under halothane anesthesia, is typically linked to malignant hyperthermia.
This condition presents a challenge in airway management due to potential jaw stiffness.

Observation:

A case study documented masseter muscle rigidity in an adult patient after administration of vecuronium, a non-depolarizing muscle relaxant.
This observation suggests a rare potential for non-depolarizing agents to induce this adverse reaction in adults.

Findings:

Limited data from this and similar cases indicate that non-depolarizing muscle relaxants can, albeit very rarely, cause masseter muscle rigidity in adult patients.
The incidence appears significantly lower than with suxamethonium in pediatric populations.

Related Experiment Videos

Implications:

Masseter muscle rigidity induced by non-depolarizing muscle relaxants, though rare in adults, necessitates careful airway management considerations.
Current evidence suggests this specific type of rigidity is unlikely to progress to generalized rigidity or malignant hyperthermia, offering some reassurance.