The purpose of the review is to analyze the possibilities of using of pectin enterosorbents for the prevention of acute poisoning. Low-esterified pectins exhibit high sorbing activity against multicharged cations, are highly adhesive to the mucous membranes of the digestive tract and are able to reduce non-specifically the permeability of the enterohematic barrier. The expected duration of the preventive effect of pectin enterosorbents is 4-5 hours after their administration. In combination with good tolerability and ease of use, this indicates the prospects of low-esterified pectins as means of drug prevention of acute poisoning in case of increased risk of oral or inhalation intake of heavy metals, nuclear fission materials and nuclear fission products.
Ammonia level in the blood increased within 3 h after intraperitoneal injection of cyclophosphamide in doses of 200, 600, and 1000 mg/kg: by 1.4, 1.8, and 2.5 times in the blood from v. portae, by 1.5, 2.1, and 3.3 times in the blood from v. cava caud. caudally to vv. renales orifice, and by 1.8, 2.7, and 4.2 times, respectively, in the same vein cranially to vv. hepaticae. A positive portocaval gradient of ammonia concentration was abolished. Blood concentrations of glutamine and urea increased less markedly than those of ammonia. Ammonia and glutamine accumulation in isotonic saline injected to animals intraperitoneally 2.5 h after cyclophosphamide was stimulated depending on the drug dose. Blood concentrations of cytolysis markers (lactate dehydrogenase and alanine and aspartate transaminases) increased. Ammonia, glutamine, and urea concentrations in the blood remained high 18 h after injection of cyclophosphamide, the glutamine/ammonia ratio increased. These data indicate that a single intraperitoneal injection of cyclophosphamide to rats in doses of 200-1000 mg/kg disorders detoxification and stimulates transperitoneal diffusion of ammonia from the digestive tract to the posterior vena cava basin with the development of hyperammoniemia.
The purpose of this review is to substantiate approaches for improving first aid in acute poisoning. Early administration of medical agents to the victims is advisable, but in injectable dosage form is problematic. An alternative is a nasal spray – dosage form that is suitable for systemic administration of pharmaceutical substances with small molecular weight (up to 1000 Da) and moderate hydrophilicity (log Poctanol/water ≥ 0), and a single dose of which can be contained in volume of up to 0, 3 ml. These criteria are met by the number of pharmaceutical substances used for the treatment of acute poisoning with substances that can form foci of mass destruction. This defines the perspective of nasal sprays as a medical device that allows to speed up, simplify and make it safer to use drugs when providing first aid in the centers of mass chemical destruction.
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