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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Effects of 4-dimethylaminophenol and Co2EDTA on circulation, respiration, and blood homeostasis in dogs.

The effects of intravenously injected 4-dimethylaminophenol and Co2EDTA on peripheral circulation, respiration, acid-base balance, and several other physiological and biochemical parameters were studied on dogs. DMAP increased the respiratory minute volume and mean arterial pressure, diminished the lactate-to-pyruvate ratio, and induced an increase in arterial oxygen pressure caused by liberation of oxygen from oxyhemoglobin during the formation of ferrihemoglobin. A study in vitro of the fate of the oxygen during the reaction between DMAP and oxyhemoglobin showed that only 30--40% of the oxygen released by the formation of ferrihemoglobin appeared in the gas phase. Co2EDTA caused circulatory depression, hyperventilation, and metabolic acidosis resulting in a decrease in base-excess and pH. The concentrations of lactate, pyruvate, potassium, and urea nitrogen and the hemoglobin content were increased by Co2EDTA. The side effects of Co2EDTA in therapeutic doses were more serious than those of DMAP. Thus the latter is superior in the therapy of cyanide poisoning, all the more since it detoxifies more cyanide.[1]


  1. Effects of 4-dimethylaminophenol and Co2EDTA on circulation, respiration, and blood homeostasis in dogs. Klimmek, R., Fladerer, H., Szinicz, L., Weger, N., Kiese, M. Arch. Toxicol. (1979) [Pubmed]
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