[Anti-arrhythmia activity of derinat in an experiment].

The acute toxicity of the immunostimulant derinat is very low: the LD50 value for intraperitoneal administration exceeds 1000 mg/kg. The drug effectively prevents from acute arrhythmia development upon occlusion in cats and produces antifibrillator effect on a model of reperfusive arrhythmia in a dose of 7.5 mg/kg.

[Manifestations of pseudo-allergy in different diseases in children].

Fifty-seven children aged 1 to 14 years with pseudoallergic reactions were followed up. The reactions manifested in the form of eczema, neurodermatitis, urticaria, and Quincke's edema. All the patients showed different pathology associated with the above-indicated skin reactions.

[New mediators of allergy and inflammation of a lipid nature].

Various substances considered as mediators responsible for regulation of both cellular and humoral components of inflammatory and allergic reactions are produced in course of oxidation of arachidonic acid by means of lipoxygenase. These substances included a number of stereochemically different monohydroxyeicosatetraenoic acids as well as leukotrienes. Components of slowly acting substance in anaphylaxis (leukotrienes C4 and D4) caused contraction of smooth muscles, constriction of bronchopulmonary system, alteration in permeability and tonus of capillary blood vessels in skin and other tissues.