Biomedical subjects
Publications and source records attributed to V L Popkov.
We propose a new method for evaluation of conduction anesthesia in animals: by the degree of prolongation of cardiac cycle during vagus nerve stimulation by solitary electric discharges synchronous to the dominant ECG wave, proximally from the site of anesthetic application on the nerve.
Parameters of NO metabolism in the gingiva were studied during experimental periodontitis accompanied by alloxan diabetes and exogenous hypercholesterolemia. We measured activities of inducible and constitutive NO synthase and concentrations of stable NO end metabolites in rat gingival tissue (total contents of nitrite and nitrate). Under pathological conditions NO-metabolism significantly differed from the control. Treatment with mexidol for 14 days significantly decreased activity of inducible NO synthase in the gingiva of experimental animals.
We studied morphology of the regeneratory process in gingival tissues during treatment of exacerbation of chronic generalized periodontitis. Richlocaine treatment led to more pronounced activation of neoangiogenesis in inflammatory cellular infiltrate in comparison with traditional drug treatment. Richlocaine stimulated vascularization of regenerating tissues, promoted more extensive normalization of the structure of the gingival mucosa, and prevented the development of fibrosclerotic changes.
Treatment with richlocaine alone and, especially, in combination with antihypoxant energostim decreased the total content of hydroxyproline in the ischemic skin flap on day 3 after excision. Combination therapy with richlocaine and energostim normalized the redox potential in the energy supply system, improved antioxidant protection, and promoted the recovery of a balance between various components in the antioxidant system. These changes were not accompanied enhanced production of malonic dialdehyde. Our results suggest that combination therapy with richlocaine and energostim maintains the adaptive reserves of detoxifying systems in keratinocytes and prevents endotoxemia. Richlocaine primarily stimulates glycolytic synthesis of ATP, activates nonmitochondrial antioxidant enzymes, and increases RNase activity in lysosomes.
The local anesthetic richlocaine decreased the area of necrosis in the skin flap under conditions of reduced blood flow by 29.5%. Improved survival of skin flap after richlocaine treatment alleviated endogenous intoxication, reduced secondary inflammatory reaction, improved liver function, and normalized the ratio between vasoconstricting and vasodilating prostaglandins. This effect was most pronounced after combination therapy with richlocaine and direct-action antihypoxant energostim.
We studied morphological characteristics of the regenerative process in gingival tissues during therapy of chronic periodontitis. Energostim stimulated macrophageal reaction and promoted neoangiogenesis in the inflammatory infiltrate. It was not observed after traditional drug therapy. Energostim promoted vascularization in regenerating tissues, normalized the structure at a greater area of the lamina propria of the gingiva, and prevented fibrous and sclerotic changes. The volume of histiolymphocytic infiltrates in regenerating gingival tissues decreased after application of intradental splints.
We studied the effect of local anesthetic richlocaine on proliferation and intracellular calcium content in cultured osteoblasts from rat parietal bone. In a concentration of 1 mg/ml this drug produced a cytotoxic effect on osteoblasts. In concentrations of 0.01 and 0.001 mg/ml richlocaine in the absence and presence of subtoxic dose of sodium cyanide (0.2 mM) increased the number of osteoblasts by 15.4 and 36.6 or 13.8 and 38.6%, respectively. In a concentration of 1 mg/ml, richlocaine increased the content of cytosolic calcium in osteoblasts by 105%. These effects of richlocaine in low concentrations (0.01 and 0.001 mg/ml) can be related to stimulation of metabolic processes in osteoblasts.
Morphological study confirmed the positive effect of succinic acid on tissue ultrastructure, energy metabolism in cells of fibroblastic differon, reorganization and neogenesis of intercellular substance of the periodontal connective tissue during the retention period after correction of simulated dental torsion abnormality in dogs.
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The white rats exposed to 60 and 100 day hypokinesia showed a substantial and progressive decline in the tolerance to a maximum physical load. This was accompanied by disorders in the regulation of the oxygen balance: during load oxygen requirements were mainly met by the oxygen debt. The above changes that followed a 100 day hypokinesia returned to the normal two months later.
The physiological effect of prolonged accelerations of 2 and 4 g applied longitudinally and transversely to the long axis of the body of white rats was studied. The animals exposed to accelerations for 24 hours showed a decrease in the heart rate, respiration rate, rectal temperature, pO2, and pCO2 in the peripheral tissues.
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The toxicity of potassium hydrocarbonate and chloride was compared in tests on 113 albino rats. It was noted that following introduction of maximal amounts of potassium chloride death occurred earlier in these animals than in the ones which received equivalent doses of potassium hydrocarbonate. Simultaneous administration of sodium hydrocarbonate reduced the toxicity of potassium hydrocarbonate and potassium chloride. Morphological investigations brought out that toxic doses of potassium hydrocarbonate led to shifts of the carbohydrate and lipids metabolism. Some mechanisms underlying the action of potassium chloride and potassium hydrocarbonate are discussed.