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Halothane testing for malignant hyperthermia in swine: dose-response effects.

C J McGrath, J C Lee, W E Rempel

    American Journal of Veterinary Research
    |September 1, 1984
    PubMed
    Summary
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    For malignant hyperthermia (MH) testing in Pietrain pigs, halothane concentrations below 3% can cause false negatives. A 3% halothane concentration is generally sufficient for accurate MH diagnosis in pigs.

    Area of Science:

    • Veterinary Medicine
    • Animal Genetics
    • Pharmacology

    Background:

    • Malignant hyperthermia (MH) is a severe pharmacogenetic disorder affecting skeletal muscle.
    • Pietrain pigs are known for their susceptibility to MH, posing challenges in livestock management and research.
    • Accurate diagnostic methods are crucial for identifying MH-susceptible animals.

    Purpose of the Study:

    • To determine the optimal halothane concentration for diagnosing malignant hyperthermia in Pietrain pigs.
    • To evaluate the relationship between halothane concentration and MH reaction time and mortality.
    • To identify potential for false-negative results at lower halothane concentrations.

    Main Methods:

    • 102 purebred Pietrain pigs susceptible to MH were exposed to varying concentrations of halothane (0-5%) in oxygen.

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  • Muscle rigidity (MH(+) reactions), reaction times, and mortality were recorded for each concentration group.
  • Statistical analysis (P < 0.05) was used to assess the significance of halothane concentration on observed outcomes.

    • Main Results:

    • Halothane concentration significantly affected the incidence of MH(+) reactions and reaction times.
    • Mortality rates were not significantly influenced by halothane concentration.
    • False-negative MH reactions were observed at halothane concentrations below 3%.
    • Increasing halothane concentration from 0% to 5% progressively and significantly decreased reaction times.

    Conclusions:

    • A halothane concentration of 3% is generally sufficient for reliable MH testing in Pietrain pigs.
    • Lower halothane concentrations (less than 3%) increase the risk of false-negative MH diagnoses.
    • Optimized halothane concentrations improve the accuracy and efficiency of MH testing in susceptible swine populations.