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. 1983 Jun;24(6):172–177.

Canine Malignant Hyperthermia: Diagnosis of Susceptibility in a Breeding Colony

P J O'Brien, P H Cribb, R J White, E D Olfert, J E Steiss
PMCID: PMC1790357  PMID: 17422267

Abstract

Fifteen related dogs were studied for susceptibility to malignant hyperthermia using halothane challenge and caffeine contracture tests. These dogs had hypertrophied muscles, were of a nervous temperament and had rectal temperatures at the upper limit of the normal range. Clinical pathology findings were mild elevations of serum aspartate transaminase and mean corpuscular hemoglobin. In vitro caffeine contracture tests were performed on muscle biopsies from five of these dogs. The concentration of caffeine required to increase resting tension by 1 g in biopsy specimens of these dogs was significantly lower than that required for control dogs: 7.6 ± 1.38 (x̄ ± SEM) versus 15.5 ± 2.52 mM (P < 0.025), and in the presence of 1% halothane, 3.6 ± 1.44 versus 10.6 ± 2.19 mM (P < 0.05). Internal nuclei, fiber caliber variation and fiber hypertrophy were found in histological studies of muscle biopsies. Two other dogs possibly died of a canine stress syndrome analagous to the porcine stress syndrome which occurs in malignant hyperthermia susceptible swine. Eight others of this family were anesthetized with halothane or methoxyflurane. Methoxyflurane did not trigger the syndrome. The first exposure to halothane caused death from malignant hyperthermia in two dogs and a third died on the second exposure to halothane. Postmortem findings were nonspecific. The other three dogs exposed to halothane recovered uneventfully. Inheritance of the defect conforms to a multifactorial pattern, with gradations of susceptibility.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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