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E K Berezina

Publications and source records attributed to E K Berezina.

At least 19 recordsLinked to original sources
PubMed1985

[Decrease of sisomicin nephrotoxicity as affected by cephalothin: pharmacokinetic evaluation].

The effect of cephalothin on the nephrotoxicity and pharmacokinetics of sisomicin was studied on Wistar rats. Sisomicin was injected intramuscularly in doses of 12.5 and 25 mg/kg alone or in combination with cephalothin in a dose of 360 mg/kg once a day for 16 days. It was shown that the combined use of sisomicin and cephalothin resulted in less pronounced functional and morphological changes in the kidneys as compared to the use of sisomicin alone. The decrease in the nephrotoxic effect was accompanied by a decrease in the sisomicin concentration in the blood serum and the site of the nephrotoxic effect (the kidney cortical layer) and the period of the aminoglycoside half-life in the kidney cortical layer under the action of cephalothin. The analysis of the relation between the nephrotoxic effect and the concentration of sisomicin in the kidney cortical layer and blood serum demonstrates that the nephrotoxicity of the sisomicin combination with cephalothin is mainly due to a decrease in the aminoglycoside concentration in the zone of the nephrotoxic effect.

Animals↗
PubMed1985

[Experimental study of the pharmacological properties of amikacin].

The general toxic and organotropic properties of amikacin were studied in acute and chronic experiments. The antibiotic was administered to the experimental animals in the doses equivalent to the therapeutic ones for humans or exceeding them 2-3 times. No unfavourable effect of amikacin in the above doses on hearing was observed. A certain increase in the level of urea nitrogen in the blood serum and leukopenia were registered only after administration of the highest drug dose exceeding 2 times the equivalent treatment dose of amikacin for humans (15 g). After the use of this dose separate microfocal necrotic lesions were detected morphologically in the proximal tubules of the kidneys. The lesions were of a transitory nature. It is concluded that amikacin has a wide range of therapeutic doses and the level of its safety is rather high.

Alanine Transaminase↗
PubMed1984

[Action of reumycin on the blood system in an experiment].

The effect of reumycin, an antitumor antibiotic on the peripheral circulatory system and bone marrow was studied on albino rats. The drug was injected intraperitoneally in a dose of 25 mg/kg daily for 30 days. It was shown that reumycin had a comparatively low toxic effect on the peripheral circulatory system and hemopoiesis. It induced the signs of transitory anemia and did not suppress the regenerative capacity of the bone marrow. After the drug repeated use there was an increase in the platelet count and in the rate of blood coagulation. These signs vanished a month after the end of the treatment course.

Animals↗
PubMed1984

[Experimental study of lincomycin ointment and gel].

The pharmacokinetics and safety of the lincomycin ointment and gel were studied. It was shown that diffusion of lincomycin through the skin was satisfactory. Investigation of their general toxicity and organotropic properties revealed neither irritating effect nor changes in the internal organs associated with the toxic effect of the drugs. On the basis of the data on the stability of the lincomycin ointment and gel obtained on their storage the lincomycin ointment was recommended for industrial production.

Administration, Topical↗
PubMed1983

[General toxic and organotropic properties of sisomicin sulfate in chronic experiments on animals].

General toxic and organotropic properties of sisomicin sulfate were studied in chronic experiments on different animal species with the use of doses equivalent to therapeutic ones in humans or exceeding them by several times. When sisomicin was injected intramuscularly for 4 weeks in a dose equivalent by the body surface to the average daily dose for humans, no significant effect on the macroorganism was observed. When the dose was 2--4 times higher, a significant increase in the blood serum levels of the urea nitrogen, creatinine, bilirubin and aspartate aminotransferase was shown. Histological examinations revealed focal adiposis of epithelial cells of the convoluted tubules of the kidney and small areas of parenchymal necrosis. Impairment of vestibular and auditory functions was detected in some animals.

Animals↗
PubMed1982

[Elaboration of the procedures for the pharmacokinetic interpretation of aminoglycoside nephrotoxicity: the experimental evaluation of the safety of repeated gentamycin administration].

Nephrotoxicity and pharmacokinetics of gentamicin were studied on rats treated with the antibiotic for 30 days in doses of 6.25, 12.5 and 25 mg/kg administered daily. The pharmacokinetics of gentamicin and the time course of changes in the urea nitrogen levels of the blood serum were studied after the 1st, 5th, 8th and 30th injection. The analysis of the respective curves was used for calculation of the average integral values of the concentrations of the antibiotic (C) and urea nitrogen (E). After that the average integral values of these parameters ((CAVG and EAVG respectively) within the whole treatment couse with the use of every dose were calculated in the same way by using the curves of the dynamics of C and E changing. Comparison of the diagrams of E dependence on C for gentamicin and sisomycin showed that nephrotoxicity of sisomycin was 1.48 times higher than that of gentamicin.

Aminoglycosides↗
PubMed1982

[Experimental chemotherapeutic activity of sisomycin sulfate].

The chemotherapeutic activity of sisomicin was studied in comparison to that of gentamicin with respect to the experimental infection caused by grampositive and gram-negative organisms in albino mice. It was shown that sisomicin was 2-3 times more effective than gentamicin. The higher chemotherapeutic activity of sisomicin was confirmed by the data on the pathogen isolation from the animals.

Animals↗
PubMed1980

[Comparative study of sisomicin and gentamycin action on the cells in a tissue culture].

The cytostatic effect of sisomicin and gentamicin, antibiotics from the group of aminoglycosides was studied comparatively with respect to three types of tripsinized cells of chick embryo (cells of the kidneys, liver and fibroblasts). It was found that epithelial cells and in particular kidney cells were most sensitive to the above antibiotics as compared to fibroblasts. It was also shown that gentamicin had a lower cytostatic effect on the embryonal cells of the kidneys, liver and fibroblasts as compared to sisomicin.

Animals↗
PubMed1980

[Pharmacokinetic validation of the nephrotoxic action of sisomycin. The relationship between nephrotoxicity and sisomycin concentration in the blood serum of rats].

The kinetics of urine nitrogen in the blood serum and morphological changes in the kidneys after a single and repeated intramuscular administrations of the antibiotic in doses of 12.5 and 25 mg/kg a day were studied in Wistar rats. When sisomycin was administered in a dose of 12.5 mg/kg, the increase in the urine nitrogen level after 1--30 injections was reversible, whereas at a dose of 25 mg/kg it became irreversible already after the 5th injection. Maximum deviations in the urine nitrogen level observed within 3--6 hours after each injection of sisomicin were recorded after the 5th injection of the drug in a dose of 12.5 mg/kg and even after the 1st injection of the drug in a dose of 25 mg/kg. The deviations increased up to the 5th and 16th injection of sisomycin in doses of 12.5 and 25 mg/kg respectively. Later the deviations were less pronounced. Regardless of the dose, adipose degeneration in renal tubules was registered after 8--16 injections of the drug. By the 30th and 16th days of the drug administration in doses of 12.5 and 25 mg/kg respectively, the above changes also decreased. On the whole, pronounced functional and morphological changes in the kidneys correlated with the antibiotic dose. Relationship between the time from the beginning of sisomycin administration and the moment when the average integral concentration of the urine nitrogen increased to the upper limit of normal and the logarithm of the average integral concentration of the antibiotic in the serum was found. The safety of the clinical schemes for the use of sisomicin was estimated with the help of this relationship with respect to its nephrotoxic effect.

Animals↗
PubMed1980

[Effect of carfecillin on the body of animals in single and multiple administrations].

The effect of carfecillin on blood circulation, respiration, hepatic and renal functions, peripheral blood picture, growth and development of young animals was studied in acute and chronic experiments. The allergizating properties of the drug were also investigated. Carfecillin is low toxic. LD50 for albino mice on intravenous and oral administration of the drug is 782.5 and 3924 mg/kg respectively. When used repeatedly for treatment of rats in oral doses of 180 and 275 mg/kg corresponding to the daily doses for humans calculated for the body surface, carfecillin had no adverse effect on hepatic or renal function, cell composition of the blood, augmentation of the weight and relative weight of the organs of the growing animals. No detectable effect of carfecillin on arterial pressure, respiration, rhythm and amplitude of the systole was observed in acute experiments with anesthetized cats treated with the antibiotic intravenously in doses of 320 mg/kg. Histological examination of the internal organs of the rats treated with oral carfecillin during 2 months showed that the drug had an irritating effect on the gastrointestinal mucosa only in a dose of 540 mg/kg, which is 2 times higher than the equivalent daily dose for humans. Carfecillin possesses the allergizating properties and induces development of cross allergy to benzylpenicillin. The above properties were less pronounced in carfecillin than in benzylpenicillin.

Animals↗
PubMed1978

[Experimental study of a gentamycin ointment].

Technology of 0.1 per cent gentamicin ointment production was developed. The ointment base consisted of vaseline and parafin (95:5). Pharmacokinetics and innocuousness of the gentamicin ointment were studied. It was shown that the ointment provided gentamicin diffusion through the skin utegument during a long period of time. Histological studies showed no local irritating effect of the ointment on the skin in its local use.

Administration, Topical↗
PubMed1978

[Experimental study of the organotropic properties of dactinomycin].

Dactinomycin was studied pharmacologically on experimental animals. When dactinomycin was administered to the test-animals in doses close to the therapeutic ones for humans, suppression of the bone marrow blood formation was registered in spite of some increase in the number of the reticulocytes and thrombocytes in the peripheral blood and acceleration of the process of blood coagulation. In addition, the urea nitrogen blood levels increased. When the drug was administered in higher doses, suppression of the bone marrow blood formation was pronounced and the number of the leucocytes, reticulocytes and thrombocytes in the peripheral blood decreased. The rate of the blood coagulation decreased, while the biochemical values of the blood were indicative of impairement of the liver and kidney functions.

Animals↗
PubMed1978

[Acute toxicity and the cumulative properties of carfecillin].

Acute toxicity of oral and intraperitoneal carfecillin was studied on different species of laboratory animals, such as albino mice, rats and guinea pigs. The average lethal doses equal to 3040 (2393.7-3860.8) and 1325 (1104.2-1590) mg/kg for oral and intraperitoneal administration respectively allowed the authors to consider the antibiotic as a low toxic substance under conditions of a single administration. Higher toxicity of carfecillin as compared to carbenicillin may be due to production of free phenol on carfecillin hydrolysin in the animal organism. The different laboratory animals of both sexes had almost the same sensitivity to the antibiotic. On repeated administration of carfecillin to the albino mouse stomach (in portions of LD50) no cumulative properties of the antibiotic were observed.

Animals↗
PubMed1977

[Experimental study of a gentamicin aerosol].

The study of gentamicin aerosol showed its relative innocuousness: it did not inhibit the growth and development of young animals, did not induce pathological changes in the upper respiratory tract, kidneys, liver, heart and spleen on its prolonged use. Pathohistological examination revealed slight irritating effect of the gentamicin aerosol in the lungs after its use in a dose of 8 or 25 mg/kg for 6 weeks. A procedure for investigating the effect of the aerosol on the activity of the trachea ciliated epithelium of warm blooded animals was developed. The gentamicin aerosols prepared from solutions of different concentrations (1 to 50 mg/ml) induced ingibition of the ciliated epithelium function at average from 15 to 35 per cent which was associated with the solution acidity (pH 4.54 to 4.82). Such a decrease in the function of the ciliated epithelium due to the antibiotic aerosol use was a factor prolonging the antibiotic retention time in the respiratory organs. It was found that aqueous solutions of drugs used for inhalation, such as ephedrin, euphelin, dimedrol, N-acetyl-L-cystein and others had no effect on the activity of gentamicin and may be used with it in a form of aerosols.

Aerosols↗