By the halothane test we determined the development of the syndrome of malignant hyperthermia in pigs of the Belgian Landrace breed with body weight of 20 kg. We found that from 27 animals that were subjected to the test 12 positively reacted to Narcotan - Spofa anaesthesis. Pigs with the syndrome of malignant hyperthermia had considerably higher rectal temperature after anaesthesis, lower PH of venose blood, higher concentration of lactic acid and glucosis in the blood plasma. Halothane-negative animals did not produce and conspicuous changes of these indices. Most differences were statisticaly highly significant.
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