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Related Experiment Videos

Interaction between succinylcholine and ranitidine in rats

Y Mishra1, I Ramzan

  • 1Pharmacy Department, University of Sydney, New South Wales, Australia.

Canadian Journal of Anaesthesia = Journal Canadien D'Anesthesie
|January 1, 1993
PubMed
Summary

Ranitidine, a histamine H2 receptor blocker, was found to potentiate neuromuscular paralysis induced by succinylcholine in rats. This effect, similar to cimetidine, has implications for anesthesia drug interactions.

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Area of Science:

  • Pharmacology
  • Anesthesiology
  • Neuroscience

Background:

  • Histamine H2 receptor blockers are commonly used medications.
  • Potential drug interactions during anesthesia require thorough investigation.
  • Previous studies suggested cimetidine may affect neuromuscular blockade.

Purpose of the Study:

  • To investigate the effect of ranitidine on neuromuscular paralysis.
  • To determine if ranitidine potentiates the neuromuscular blocking effects of succinylcholine.
  • To compare ranitidine's effects to those of cimetidine.

Main Methods:

  • In vivo study using urethane-anesthetized, mechanically ventilated rats.
  • Succinylcholine administered via bolus and infusion to induce muscle paralysis.

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  • Ranitidine administered intravenously at various doses (2.5-20 mg/kg).
  • Measurement of tibialis anterior muscle paralysis and serum ranitidine concentrations.

    • Main Results:

    • Ranitidine caused immediate potentiation of neuromuscular paralysis, followed by transient reversal and then steady-state potentiation.
    • Peak potentiation correlated strongly with serum ranitidine concentration (r2 = 0.98).
    • A weak correlation was observed between peak reversal and serum ranitidine levels.

    Conclusions:

    • Ranitidine significantly alters the neuromuscular action of succinylcholine in rats.
    • The findings suggest a potential for ranitidine to influence neuromuscular blockade during anesthesia.
    • Ranitidine's effects on neuromuscular function are comparable to those of cimetidine.