Abstract:Studies are reported on the blood levels of carbon tetrachloride following administration of 8 ml of the drug to sheep by ruminal, abomasal, and intramuscular routes. Absorption was most rapid with ruminal administration, slowest with intramuscular, and intermediate with abomasal administration. The drug could be detected in expired air within 5 min of administration. Peak levels in the blood of c. 16 to 20 pg per ml were reached, with ruminal and abomasal administration, at c. 15-30 min and 60-120 min respect… Show more
“…In sheep carbon tetrachloride is rapidly absorbed from the rumen, the concentration in venous blood rising to 15-20 ig/ml following administration of 8 ml of the drug (Kondos & McClymont, 1961). The concentration of carbon tetrachloride in portal blood does not seem to have been estimated, but it is likely to be higher than that in the jugular vein.…”
An in vitro preparation of Fasciola hepatica is described which responded to electrical stimulation with tetanic spasms. Both carbon tetrachloride (20–500 nl/ml), and its metabolite chloroform (50–1000 nl/ml), produced contractions in the preparation which extinguished the responses to electrical stimulation. It is suggested that the spasmogenic action of carbon tetrachloride and its metabolite may contribute to the fasciolifugal action of the drug.
Hexachloroethane, another fasciolifuge, had very little effect in the preparation. However, penta‐chloroethane and tetrachloroethylene, the main products of the metabolism of hexachloroethane in sheep, were potent spasmogens in preparations of Fasciola hepatica. Pentachloroethane was about twice as potent as carbon tetrachloride.
Tetrodotoxin (2 μg/ml) did not antagonize the responses of the preparation to electrical stimulation or carbon tetrachloride.
“…In sheep carbon tetrachloride is rapidly absorbed from the rumen, the concentration in venous blood rising to 15-20 ig/ml following administration of 8 ml of the drug (Kondos & McClymont, 1961). The concentration of carbon tetrachloride in portal blood does not seem to have been estimated, but it is likely to be higher than that in the jugular vein.…”
An in vitro preparation of Fasciola hepatica is described which responded to electrical stimulation with tetanic spasms. Both carbon tetrachloride (20–500 nl/ml), and its metabolite chloroform (50–1000 nl/ml), produced contractions in the preparation which extinguished the responses to electrical stimulation. It is suggested that the spasmogenic action of carbon tetrachloride and its metabolite may contribute to the fasciolifugal action of the drug.
Hexachloroethane, another fasciolifuge, had very little effect in the preparation. However, penta‐chloroethane and tetrachloroethylene, the main products of the metabolism of hexachloroethane in sheep, were potent spasmogens in preparations of Fasciola hepatica. Pentachloroethane was about twice as potent as carbon tetrachloride.
Tetrodotoxin (2 μg/ml) did not antagonize the responses of the preparation to electrical stimulation or carbon tetrachloride.
“…Although the intramuscular injection of CC14 is not as efficient against F. hepatica as oral administration, it may be used with a greater margin of safety (Boray and Pearson unpublished data; Winterhalter and Delak 1953;Kondos and McClymont 1961;Kondos et a1 1963). To avoid muscular damage in sheep, subcutaneous injection may be preferred to intramuscular injection, but there is more transient pain with the former method.…”
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