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Porcine malignant hyperthemia IV: Neuromuscular blockade
British Journal of Anaesthesia
|December 1, 1976
Summary
Tubocurarine and pancuronium offer limited protection against porcine malignant hyperthermia (MH). These neuromuscular blockers did not consistently prevent MH triggered by halothane or suxamethonium in Pietrain pigs.
Area of Science:
- Anesthesiology
- Veterinary Pharmacology
- Animal Physiology
Background:
- Malignant hyperthermia (MH) is a severe hypermetabolic crisis.
- Porcine models are crucial for studying MH pathophysiology and treatment.
- Neuromuscular blocking agents' role in MH is not fully elucidated.
Purpose of the Study:
- To investigate the efficacy of tubocurarine and pancuronium in preventing or mitigating porcine malignant hyperthermia.
- To explore the influence of neuromuscular blockade on MH susceptibility in Pietrain pigs.
Main Methods:
- Pietrain pigs were challenged with suxamethonium or halothane to induce MH.
- Tubocurarine or pancuronium was administered prior to or during MH triggering agents.
- Physiological responses indicative of MH were monitored.
Main Results:
- Tubocurarine partially inhibited suxamethonium-induced MH but failed to prevent fatal halothane-induced MH.
- Pancuronium provided only partial protection against halothane-induced MH, with some pigs succumbing only after blockade reversal.
- These findings suggest that prior muscle activity may influence MH sensitivity.
Conclusions:
- Neither tubocurarine nor pancuronium can be relied upon to prevent malignant hyperthermia in susceptible pigs.
- The partial protective effect of pancuronium warrants further investigation into its interaction with MH triggers.
- Understanding neuromuscular blockade effects is vital for anesthetic safety in MH-susceptible individuals.