G. Baikalov, N. Leonov, P. Madonov, K. Ershov, K. I. Bakhareva, M. Soldatova
The pharmacological experiments on isolated organs (ex vivo) are the preferred method for assessing the primary pharmacodynamics of the studied drugs, since this method is completely excluded the systemic influence of neurohumoral regulation. In the last decade, a new group of thrombolytic drugs based on immobilized subtilisins has been formed. At the stage of registrational preclinical and clinical studies, their pleiotropic pharmacological effects have not been studied. Meanwhile, there is a reason to consider that their pharmacological activity in the bloodstream is not limited to thrombolytic action, but may be extended to a systemic effect on the cardiovascular system. The aim of the study was to investigate the chronotropic effects of an isolated heart during its perfusion with solutions of immobilized subtilisins at different concentrations. Material and methods. The isolated rat heart model according to Langendorff was used in the study. The experiment included 50 Wistar rats, which were divided into 5 groups: isolated hearts perfused only with Krebs – Henseleit solution (control) or with immobilized subtilisins in 4 concentrations (170, 340, 510 и 1020 U/l). Results and discussion. The immobilized subtilisins have a negative chronotropic effect. The onset of the effect depends on the drug concentration in the solution: the higher concentration, the earlier effect. From 5 to 10 minutes of perfusion, a negative chronotropic effect is observed using of immobilized subtilisins at any dose. The duration of its increase is manifested up to 10–20 minutes, depending on the drug concentration in solution. After 20 minutes of perfusion, the achieved negative chronotropic effect remains at a plateau level up to 40 minutes. Conclusion. The immobilized subtilisins have an independent pharmacological effect on heart rate.
{"title":"Chronotropic action of immobilized subtilisins during the perfusion of an isolated rat heart","authors":"G. Baikalov, N. Leonov, P. Madonov, K. Ershov, K. I. Bakhareva, M. Soldatova","doi":"10.18699/ssmj20220505","DOIUrl":"https://doi.org/10.18699/ssmj20220505","url":null,"abstract":"The pharmacological experiments on isolated organs (ex vivo) are the preferred method for assessing the primary pharmacodynamics of the studied drugs, since this method is completely excluded the systemic influence of neurohumoral regulation. In the last decade, a new group of thrombolytic drugs based on immobilized subtilisins has been formed. At the stage of registrational preclinical and clinical studies, their pleiotropic pharmacological effects have not been studied. Meanwhile, there is a reason to consider that their pharmacological activity in the bloodstream is not limited to thrombolytic action, but may be extended to a systemic effect on the cardiovascular system. The aim of the study was to investigate the chronotropic effects of an isolated heart during its perfusion with solutions of immobilized subtilisins at different concentrations. Material and methods. The isolated rat heart model according to Langendorff was used in the study. The experiment included 50 Wistar rats, which were divided into 5 groups: isolated hearts perfused only with Krebs – Henseleit solution (control) or with immobilized subtilisins in 4 concentrations (170, 340, 510 и 1020 U/l). Results and discussion. The immobilized subtilisins have a negative chronotropic effect. The onset of the effect depends on the drug concentration in the solution: the higher concentration, the earlier effect. From 5 to 10 minutes of perfusion, a negative chronotropic effect is observed using of immobilized subtilisins at any dose. The duration of its increase is manifested up to 10–20 minutes, depending on the drug concentration in solution. After 20 minutes of perfusion, the achieved negative chronotropic effect remains at a plateau level up to 40 minutes. Conclusion. The immobilized subtilisins have an independent pharmacological effect on heart rate.","PeriodicalId":33781,"journal":{"name":"Sibirskii nauchnyi meditsinskii zhurnal","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-10-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41342705","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Excessive sensitivity of the respiratory tract to physical and chemical environmental triggers can vary for many reasons, reducing the therapy effectiveness in a patient with asthma. Aim of the study was to investigate the effectiveness of a short-acting bronchodilator in patients with asthma for the relief of acute cold bronchospasm after a test of isocapnic cold air hyperventilation (ICHV). Material and methods. In 281 (161 women; 120 men, p > 0.05) asthma patients with cold airway hyperresponsiveness (CAHR), the change in airway patency (FEV1) and the efficacy of short-acting β2-agonists (SABA) after a 3-minute isocapnic hyperventilation with cold (–20 ºС) air. Results. According to clinical data, patients had persistent asthma, mean age 35 (26; 44) years, 49 % of patients smoked, ACT 16 (12; 20) points, FEV1 90.0 ± 1.0 % predicted, FEV1/VC 71.4 ± 0.6 %, the increase in FEV1 after inhalation of SABA (∆FEV1β) was 11.1 (5.1; 20.5) %. The change in FEV1 for the ICHV varied within –16 (–22.0; –12.0) %. The use of SABA after the IHCV showed different efficacy for relief of an attack of cold bronchospasm. The median value of ∆FEV1β after ICHV was 21.1 (11.6; 33.3) %, with a range of –48.6 to 108.2 %. In the general group, there was a direct relationship between the level of asthma control in terms of ACT points and the baseline FEV1 (Rs = 0.17; p = 0.007), MEF25-75 (Rs = 0.18; p = 0.008), ∆FEV1β in response to SABA (Rs = –0.17; p = 0.0104), as well as the severity of the bronchial response to the ICHV (Rs = 0.15; p = 0.014). The latter, in turn, correlated with ∆FEV1β after ICHV (Rs = –0.28; p < 0.0001) after HCI. Conclusions. There is a differentiated airway response to SABA after acute cold bronchoprovocation. The results obtained can serve as an important tool for phenotyping of asthma patients with CAHR for the medication correction of сold bronchospasm.
{"title":"Efficiency of using a short-acting β2-agonist for the relief of acute cold bronchospasm in asthma patients with cold airway hyperresponsiveness","authors":"A. G. Prihodko, J. Perelman","doi":"10.18699/ssmj20220511","DOIUrl":"https://doi.org/10.18699/ssmj20220511","url":null,"abstract":"Excessive sensitivity of the respiratory tract to physical and chemical environmental triggers can vary for many reasons, reducing the therapy effectiveness in a patient with asthma. Aim of the study was to investigate the effectiveness of a short-acting bronchodilator in patients with asthma for the relief of acute cold bronchospasm after a test of isocapnic cold air hyperventilation (ICHV). Material and methods. In 281 (161 women; 120 men, p > 0.05) asthma patients with cold airway hyperresponsiveness (CAHR), the change in airway patency (FEV1) and the efficacy of short-acting β2-agonists (SABA) after a 3-minute isocapnic hyperventilation with cold (–20 ºС) air. Results. According to clinical data, patients had persistent asthma, mean age 35 (26; 44) years, 49 % of patients smoked, ACT 16 (12; 20) points, FEV1 90.0 ± 1.0 % predicted, FEV1/VC 71.4 ± 0.6 %, the increase in FEV1 after inhalation of SABA (∆FEV1β) was 11.1 (5.1; 20.5) %. The change in FEV1 for the ICHV varied within –16 (–22.0; –12.0) %. The use of SABA after the IHCV showed different efficacy for relief of an attack of cold bronchospasm. The median value of ∆FEV1β after ICHV was 21.1 (11.6; 33.3) %, with a range of –48.6 to 108.2 %. In the general group, there was a direct relationship between the level of asthma control in terms of ACT points and the baseline FEV1 (Rs = 0.17; p = 0.007), MEF25-75 (Rs = 0.18; p = 0.008), ∆FEV1β in response to SABA (Rs = –0.17; p = 0.0104), as well as the severity of the bronchial response to the ICHV (Rs = 0.15; p = 0.014). The latter, in turn, correlated with ∆FEV1β after ICHV (Rs = –0.28; p < 0.0001) after HCI. Conclusions. There is a differentiated airway response to SABA after acute cold bronchoprovocation. The results obtained can serve as an important tool for phenotyping of asthma patients with CAHR for the medication correction of сold bronchospasm.","PeriodicalId":33781,"journal":{"name":"Sibirskii nauchnyi meditsinskii zhurnal","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-10-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47890797","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
M. Darenskaya, L. Rychkova, T. Astakhova, A. Pogodina, O. N. Dolgikh, Y. Klimkina, L. Kolesnikova
The aim of the study was to reveal the relationship between the parameters of actual nutrition and the lipid peroxidation and antioxidant defense system in adolescents aged 14–17 in a rural area. Material and methods. 76 adolescents aged 14–17 of the Irkutsk region were examined by the cross-sectional study method. Actual nutrition was studied by the 24-hour nutrition reproduction method. The content of substrates with unsaturated double bonds (DB), diene conjugates (DC), ketodienes and conjugated trienes (KD and CT), thiobarbituric acid reacting species (TBARS), α-tocopherol, retinol, reduced (GSH) and oxidized glutathione (GSSG), total blood antioxidant activity (TAA), superoxide dismutase (SOD) activity in blood by spectrophotometry and fluorometry methods were analyzed. Results. The adolescents’ diet did not meet the principles of a balanced diet – there was reduced protein intake, an imbalance of unsaturated fatty acids, A, C, D, B vitamins deficiency. An excessive element in the diet was sodium. The content of substrates with DB, KD and CT and TBARS increased significantly in the studied group of adolescents, the concentration of DC decreased. Parameters of antioxidant defense both decreased (TAA, retinol content) and increased (α-tocopherol, GSH concentration). Correlation analysis showed relationships between DB and vitamin B1, B2 content; DC level and calories, carbohydrate and vitamin B1 content; concentration of KD and CT and fats, TAA and vitamin A and β-carotene level; level of α-tocopherol in blood and vitamin E in food; GSH and vitamin K; SOD activity and vitamin H content. Multiple negative correlations were between GSSG and fat, vitamins B1, B9, C, K food concentration were found.Conclusions. The calculated vitamin consumption indicators allow to reveal nutritional deviations in adolescents and to connect them with the real provision of the body with these metabolites.
{"title":"Correlation between actual nutrition and lipid peroxidation and antioxidant defense parameters in aged 14–17 years adolescents living in rural area","authors":"M. Darenskaya, L. Rychkova, T. Astakhova, A. Pogodina, O. N. Dolgikh, Y. Klimkina, L. Kolesnikova","doi":"10.18699/ssmj20220504","DOIUrl":"https://doi.org/10.18699/ssmj20220504","url":null,"abstract":"The aim of the study was to reveal the relationship between the parameters of actual nutrition and the lipid peroxidation and antioxidant defense system in adolescents aged 14–17 in a rural area. Material and methods. 76 adolescents aged 14–17 of the Irkutsk region were examined by the cross-sectional study method. Actual nutrition was studied by the 24-hour nutrition reproduction method. The content of substrates with unsaturated double bonds (DB), diene conjugates (DC), ketodienes and conjugated trienes (KD and CT), thiobarbituric acid reacting species (TBARS), α-tocopherol, retinol, reduced (GSH) and oxidized glutathione (GSSG), total blood antioxidant activity (TAA), superoxide dismutase (SOD) activity in blood by spectrophotometry and fluorometry methods were analyzed. Results. The adolescents’ diet did not meet the principles of a balanced diet – there was reduced protein intake, an imbalance of unsaturated fatty acids, A, C, D, B vitamins deficiency. An excessive element in the diet was sodium. The content of substrates with DB, KD and CT and TBARS increased significantly in the studied group of adolescents, the concentration of DC decreased. Parameters of antioxidant defense both decreased (TAA, retinol content) and increased (α-tocopherol, GSH concentration). Correlation analysis showed relationships between DB and vitamin B1, B2 content; DC level and calories, carbohydrate and vitamin B1 content; concentration of KD and CT and fats, TAA and vitamin A and β-carotene level; level of α-tocopherol in blood and vitamin E in food; GSH and vitamin K; SOD activity and vitamin H content. Multiple negative correlations were between GSSG and fat, vitamins B1, B9, C, K food concentration were found.Conclusions. The calculated vitamin consumption indicators allow to reveal nutritional deviations in adolescents and to connect them with the real provision of the body with these metabolites.","PeriodicalId":33781,"journal":{"name":"Sibirskii nauchnyi meditsinskii zhurnal","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-10-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42460766","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
O. Obukhova, T. Ryabichenko, G. S. Karpovich, G. Skosyreva, I. V. Kuimova, M. Voevoda
Multisystem inflammatory syndrome (MIS-C) is a new childhood disease associated with coronavirus SARS-CoV-2 that manifests itself 3–4 weeks after infection. The development of MIS-C is possible, despite the asymptomatic course of coronavirus infection. The pathogenetic features of MIS-C remain unclear. The aim of the study was to investigate the state of peripheral blood parameters in children with multisystem inflammatory syndrome associated with SARS-CoV-2 upon admission to a hospital. Material and methods. We examined 52 children with MIS-C from 1 to 14 years old, hospitalized in Children`s Clinical Hospital No. 3 in Novosibirsk in October–December 2020. Testing for the isolation of SARS-CoV-2 RNA in scrapings from the nasopharynx and oropharynx was carried out using real time PCR (test systems of DNA-Technology, Russia). The presence of specific IgM and IgG antibodies to SARS-CoV-2 in blood serum was determined by ELISA using Vector-Best kits (Russia). Results and discussion. It was noted that SARS-CoV-2 virus RNA was found only in 12.8 % of cases, while specific IgG antibodies in blood serum were detected in 100 % of children. IgM to SARS-CoV-2 antigens were detected in the blood serum only in 53.85 % of children with MIS-C. It has been established that unexpressed leukocytosis was found both in children under the age of 7 and in children of 8–14 years old. However, the leukocytes content in children of the older age group was significantly lower than in children aged 1–7 years. At the same time, in both age groups, some children had extremely low values of the indicator. The causes of severe leukopenia against the background of excessive inflammation remain unclear. Age groups (1–7 and 8–14 years) do not differ statistically significantly in the relative content of lymphocytes and neutrophils. In the study of individual values of the relative content of lymphocytes within the age groups, it was noted that only some children had lymphopenia of varying severity. Conclusions. Against the background of minor leukocytosis in children with MIS-C, upon admission to the hospital, there is a tendency to develop both relative and absolute lymphopenia, regardless of age. The study noted an extremely pronounced variability of individual values of the evaluated peripheral blood parameters, regardless of age, which, with similar clinical symptoms, characterized as MIS-C, requires further study in dynamics, taking into account the initial values of the indicators.There is no pronounced relationship between the leukocytes content and specific IgM antibodies to SARS-CoV-2 antigens in the blood.
{"title":"Features of laboratory parameters in children with multisystem inflammatory syndrome associated with SARS-CoV-2","authors":"O. Obukhova, T. Ryabichenko, G. S. Karpovich, G. Skosyreva, I. V. Kuimova, M. Voevoda","doi":"10.18699/ssmj20220508","DOIUrl":"https://doi.org/10.18699/ssmj20220508","url":null,"abstract":"Multisystem inflammatory syndrome (MIS-C) is a new childhood disease associated with coronavirus SARS-CoV-2 that manifests itself 3–4 weeks after infection. The development of MIS-C is possible, despite the asymptomatic course of coronavirus infection. The pathogenetic features of MIS-C remain unclear. The aim of the study was to investigate the state of peripheral blood parameters in children with multisystem inflammatory syndrome associated with SARS-CoV-2 upon admission to a hospital. Material and methods. We examined 52 children with MIS-C from 1 to 14 years old, hospitalized in Children`s Clinical Hospital No. 3 in Novosibirsk in October–December 2020. Testing for the isolation of SARS-CoV-2 RNA in scrapings from the nasopharynx and oropharynx was carried out using real time PCR (test systems of DNA-Technology, Russia). The presence of specific IgM and IgG antibodies to SARS-CoV-2 in blood serum was determined by ELISA using Vector-Best kits (Russia). Results and discussion. It was noted that SARS-CoV-2 virus RNA was found only in 12.8 % of cases, while specific IgG antibodies in blood serum were detected in 100 % of children. IgM to SARS-CoV-2 antigens were detected in the blood serum only in 53.85 % of children with MIS-C. It has been established that unexpressed leukocytosis was found both in children under the age of 7 and in children of 8–14 years old. However, the leukocytes content in children of the older age group was significantly lower than in children aged 1–7 years. At the same time, in both age groups, some children had extremely low values of the indicator. The causes of severe leukopenia against the background of excessive inflammation remain unclear. Age groups (1–7 and 8–14 years) do not differ statistically significantly in the relative content of lymphocytes and neutrophils. In the study of individual values of the relative content of lymphocytes within the age groups, it was noted that only some children had lymphopenia of varying severity. Conclusions. Against the background of minor leukocytosis in children with MIS-C, upon admission to the hospital, there is a tendency to develop both relative and absolute lymphopenia, regardless of age. The study noted an extremely pronounced variability of individual values of the evaluated peripheral blood parameters, regardless of age, which, with similar clinical symptoms, characterized as MIS-C, requires further study in dynamics, taking into account the initial values of the indicators.There is no pronounced relationship between the leukocytes content and specific IgM antibodies to SARS-CoV-2 antigens in the blood.","PeriodicalId":33781,"journal":{"name":"Sibirskii nauchnyi meditsinskii zhurnal","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-10-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44756957","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
L. N. Rachkovskaya, A. Smagin, V. Nimaev, A. Demura, E. Rachkovsky, E. Yastrebova, V. Maltsev, M. Korolev, A. Letyagin
The aim of the study was to investigate the influence of the original porous silver–containing sorbent on the morphofunctional parameters of red blood cells during in vitro hemoperfusion. Material and methods. Donor blood was perfused through glass columns filled with a sorbent based on porous aluminum oxide, polydimethylsiloxane and silver nanoclusters and a sorbent without silver. The effect of a silver-containing sorbent on the change in morphofunctional parameters of red blood cells after perfusion through sorbents was determined by scanning flow cytometry. Results and their discussion. Due to the uniformity of the distribution of silver (0.1 %) over the sorbent granules, the parameters of the porous structure – the specific surface area and pore volume – practically do not change compared to the sorbent without silver. Morphological parameters of original donor blood and after hemoperfusion are within the norm. The functional parameters are also normal, although the introduction of silver in to the sorbent slightly increases the number of active band 3 (B3) proteins on erythrocyte membranes, both in comparison with the donor red cell mass as a control and in comparison with the sorbent without silver. There is also an increase in the ultimate extensibility of the erythrocyte membrane compared to the original blood (2.2 times) and the sorbent without silver (1.4 times). Conclusions. A sorbent modified with silver and a sorbent without silver does not have a damaging toxic effect on the morphofunctional parameters of blood under perfusion conditions. The mechanisms affecting the indicators of the ultimate extensibility of the erythrocyte membrane after blood perfusion through a silver-containing sorbent require further research.
{"title":"The effect of silver-containing sorbent on red blood cells during hemosorption: an in vitro study","authors":"L. N. Rachkovskaya, A. Smagin, V. Nimaev, A. Demura, E. Rachkovsky, E. Yastrebova, V. Maltsev, M. Korolev, A. Letyagin","doi":"10.18699/ssmj20220503","DOIUrl":"https://doi.org/10.18699/ssmj20220503","url":null,"abstract":"The aim of the study was to investigate the influence of the original porous silver–containing sorbent on the morphofunctional parameters of red blood cells during in vitro hemoperfusion. Material and methods. Donor blood was perfused through glass columns filled with a sorbent based on porous aluminum oxide, polydimethylsiloxane and silver nanoclusters and a sorbent without silver. The effect of a silver-containing sorbent on the change in morphofunctional parameters of red blood cells after perfusion through sorbents was determined by scanning flow cytometry. Results and their discussion. Due to the uniformity of the distribution of silver (0.1 %) over the sorbent granules, the parameters of the porous structure – the specific surface area and pore volume – practically do not change compared to the sorbent without silver. Morphological parameters of original donor blood and after hemoperfusion are within the norm. The functional parameters are also normal, although the introduction of silver in to the sorbent slightly increases the number of active band 3 (B3) proteins on erythrocyte membranes, both in comparison with the donor red cell mass as a control and in comparison with the sorbent without silver. There is also an increase in the ultimate extensibility of the erythrocyte membrane compared to the original blood (2.2 times) and the sorbent without silver (1.4 times). Conclusions. A sorbent modified with silver and a sorbent without silver does not have a damaging toxic effect on the morphofunctional parameters of blood under perfusion conditions. The mechanisms affecting the indicators of the ultimate extensibility of the erythrocyte membrane after blood perfusion through a silver-containing sorbent require further research.","PeriodicalId":33781,"journal":{"name":"Sibirskii nauchnyi meditsinskii zhurnal","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-10-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45306987","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A. N. Shmakov, K. V. Budarova, N. L. Elizar’eva, V. N. Kokhno
Heat and moisture exchange filters create additional dead space, comparable in volume to physiological, in premature newborns. It makes carbon dioxide remove difficultу. Reducing the dead space volume by increasing the flow in the ventilator circuit can lead to the hypocapnia. Aim of the study was to determine the safety and efficiency of gas flow boost in the ventilator circuit to hypercapnia compensation created by the additional dead space. Material and methods. The effect of the additional dead space created by a heat and moisture exchange filter on hemoglobin saturation and partial pressure of carbon dioxide at the end of expiration in premature newborns at flows of 5 and 6 l/min was studied. Results and discussion. It has been demonstrated that flows of 5–6 l/min satisfactorily compensate for the effect of additional deadspace without hypocapnia. Conclusions. It is possible to recommend the widespread use of heat and moisture exchange filters in newborn weighing at least 1.0 kg during long-term transportation.
{"title":"Evaluation of deadspace effects created by heat and moisture exchange filter during artificial lung ventilation in newborns","authors":"A. N. Shmakov, K. V. Budarova, N. L. Elizar’eva, V. N. Kokhno","doi":"10.18699/ssmj20220509","DOIUrl":"https://doi.org/10.18699/ssmj20220509","url":null,"abstract":"Heat and moisture exchange filters create additional dead space, comparable in volume to physiological, in premature newborns. It makes carbon dioxide remove difficultу. Reducing the dead space volume by increasing the flow in the ventilator circuit can lead to the hypocapnia. Aim of the study was to determine the safety and efficiency of gas flow boost in the ventilator circuit to hypercapnia compensation created by the additional dead space. Material and methods. The effect of the additional dead space created by a heat and moisture exchange filter on hemoglobin saturation and partial pressure of carbon dioxide at the end of expiration in premature newborns at flows of 5 and 6 l/min was studied. Results and discussion. It has been demonstrated that flows of 5–6 l/min satisfactorily compensate for the effect of additional deadspace without hypocapnia. Conclusions. It is possible to recommend the widespread use of heat and moisture exchange filters in newborn weighing at least 1.0 kg during long-term transportation.","PeriodicalId":33781,"journal":{"name":"Sibirskii nauchnyi meditsinskii zhurnal","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-10-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45118016","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
V. E. Pustynnikov, S. S. Tsaruk, E. A. Fomichev, E. A. Miloserdova, D. Kurkin, D. A. Bakulin, T. M. Andriashvili, A. Sokolova, N. V. Atapina, A. K. Brel, Yu. N. Budaeva, I. Tyurenkov
Cerebral circulation disorders (CCD) are one of the most common causes of mortality and disability in the population. Improving the microcirculation of brain tissue is one of the main directions in the treatment and prevention of CCD.Aim of the study was to evaluate the effect of a new derivative of hydroxybenzoic (salicylic) acid on neurological deficit, hemostasis and functional state of arterial pial vessels in the study of prostacyclin-synthetic activity and evaluation of NOmediated endothelial dysfunction in rats under experimental CCD conditions. Material and methods. The experiment was carried out on 50 Wistar rats, which were simulated for CCD by occlusion of common carotid arteries. Within 7 days after the operation, the animals received treatment according to the group: saline, C-60 (N-(3-hydroxybenzoyl)taurine dipotassium salt) and acetylsalicylic acid. After treatment, the activity of the prostacyclin-synthetic system was assessed by the reaction of pial vessels to indomethacin, endothelial dysfunction was estimated by tests with acetylcholine and L-NAME. The parameters of plasma and platelet hemostasis were also studied, and behavioral tests (open field, adhesion test, rotarod, Morris water maze, passive avoidance task) were used to assess neurological deficits in animals. Results. When studying the level of neurological deficit in animals with brain ischemia after a course of administration of the test compound, it was noted that in the treated groups, compared with the control group, there was a significant increase in motor and exploratory activity, improvement in sensory-motor function and coordination of movements (p < 0.05). Also, in the group treated with the salicylic acid derivative, normalization of the parameters of platelet and plasma hemostasis, improvement of the functional state of the vascular endothelium was observed. According to the results of assessing the prostacyclin-synthesizing activity of the endothelium of the cerebral vessels, it follows that the test compound inhibits cyclooxygenase at a level comparable with effect of acetylsalicylic acid. Conclusions. A new derivative of salicylic acid, the dipotassium salt of N-(3-hydroxybenzoyl)taurine, reduces the severity of neurological deficit, improves hemostasis parameters and the functional state of cerebral vessels in rats with brain ischemia in the experiment.
{"title":"Effect of benzoyl taurine dipotassium salt on coagulation, hemostasis and vascular activity in the microvasculature of the brain in violation of cerebral circulation","authors":"V. E. Pustynnikov, S. S. Tsaruk, E. A. Fomichev, E. A. Miloserdova, D. Kurkin, D. A. Bakulin, T. M. Andriashvili, A. Sokolova, N. V. Atapina, A. K. Brel, Yu. N. Budaeva, I. Tyurenkov","doi":"10.18699/ssmj20220507","DOIUrl":"https://doi.org/10.18699/ssmj20220507","url":null,"abstract":"Cerebral circulation disorders (CCD) are one of the most common causes of mortality and disability in the population. Improving the microcirculation of brain tissue is one of the main directions in the treatment and prevention of CCD.Aim of the study was to evaluate the effect of a new derivative of hydroxybenzoic (salicylic) acid on neurological deficit, hemostasis and functional state of arterial pial vessels in the study of prostacyclin-synthetic activity and evaluation of NOmediated endothelial dysfunction in rats under experimental CCD conditions. Material and methods. The experiment was carried out on 50 Wistar rats, which were simulated for CCD by occlusion of common carotid arteries. Within 7 days after the operation, the animals received treatment according to the group: saline, C-60 (N-(3-hydroxybenzoyl)taurine dipotassium salt) and acetylsalicylic acid. After treatment, the activity of the prostacyclin-synthetic system was assessed by the reaction of pial vessels to indomethacin, endothelial dysfunction was estimated by tests with acetylcholine and L-NAME. The parameters of plasma and platelet hemostasis were also studied, and behavioral tests (open field, adhesion test, rotarod, Morris water maze, passive avoidance task) were used to assess neurological deficits in animals. Results. When studying the level of neurological deficit in animals with brain ischemia after a course of administration of the test compound, it was noted that in the treated groups, compared with the control group, there was a significant increase in motor and exploratory activity, improvement in sensory-motor function and coordination of movements (p < 0.05). Also, in the group treated with the salicylic acid derivative, normalization of the parameters of platelet and plasma hemostasis, improvement of the functional state of the vascular endothelium was observed. According to the results of assessing the prostacyclin-synthesizing activity of the endothelium of the cerebral vessels, it follows that the test compound inhibits cyclooxygenase at a level comparable with effect of acetylsalicylic acid. Conclusions. A new derivative of salicylic acid, the dipotassium salt of N-(3-hydroxybenzoyl)taurine, reduces the severity of neurological deficit, improves hemostasis parameters and the functional state of cerebral vessels in rats with brain ischemia in the experiment.","PeriodicalId":33781,"journal":{"name":"Sibirskii nauchnyi meditsinskii zhurnal","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-10-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42561967","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
M. Khrapova, S. E. Khrapov, A. Chechushkov, P. Kozhin, L. Romakh, A. E. Serykh, S. Kholshin, N. Kandalintseva, E. Menshchikova
One of the promising areas of modern pharmacology is the development of «indirect antioxidants» capable of activating redox-sensitive signaling systems, primarily the Keap1/Nrf2/ARE system. Among its chemical inductors is the hydrophilic monosubstituted monophenol (3’-tert-butyl-4’-hydroxyphenyl)sodium propylthiosulfonate (TS-13) in development. The aim of the study was to investigate TS-13 antiproliferative activity against tumor cell line BT-474 in vitro and acute oral toxicity in mice in vivo. Material and methods. The relationship between TS-13 concentration and proliferative activity of human breast ductal carcinoma cell line BT-474 was determined using the MTT test, the IC50 was calculated and compared to the previously obtained for MCF-7 line; results were correlated with the functional properties of cells based on gene expression (in silico GSEA). In vivo acute toxicity was studied in 50 female C57Bl/6J mice, who received a TS-13 solution in distilled water at various doses by intragastric gavage. LD50 obtained experimentally and predicted in silico using the GUSAR web service were compared. Results and discussion. TS-13 inhibited the proliferation of BT-474 cells in a concentration-dependent manner (exponential approximation, IC50 = 59.5 μM) and was 2.2 times more toxic than for MCF-7 cells. This may be due to functional differences between the BT-474 and MCF-7 lines, as evidenced by the GSEA results. The LD50 value established in the in vivo experiment was 936 mg/kg body weight, the obtained value satisfactorily corresponds to the predicted in silico (561 mg/kg), although in reality the compound turned out to be somewhat less toxic than could be expected based on its structure. Conclusions. A study of the acute toxicity of the new water-soluble monophenol TC-13 allows the classification of it as slightly toxic (toxicity rating level 4) according to the Hodge – Sterner scale) or as moderately hazardous (hazard class 3) according to GOST 12.1.007-76.
{"title":"Toxicity of new monophenolic synthetic activator of Keap1/Nrf2/ARE redox-sensitive signaling system in vitro and in vivo","authors":"M. Khrapova, S. E. Khrapov, A. Chechushkov, P. Kozhin, L. Romakh, A. E. Serykh, S. Kholshin, N. Kandalintseva, E. Menshchikova","doi":"10.18699/ssmj20220502","DOIUrl":"https://doi.org/10.18699/ssmj20220502","url":null,"abstract":"One of the promising areas of modern pharmacology is the development of «indirect antioxidants» capable of activating redox-sensitive signaling systems, primarily the Keap1/Nrf2/ARE system. Among its chemical inductors is the hydrophilic monosubstituted monophenol (3’-tert-butyl-4’-hydroxyphenyl)sodium propylthiosulfonate (TS-13) in development. The aim of the study was to investigate TS-13 antiproliferative activity against tumor cell line BT-474 in vitro and acute oral toxicity in mice in vivo. Material and methods. The relationship between TS-13 concentration and proliferative activity of human breast ductal carcinoma cell line BT-474 was determined using the MTT test, the IC50 was calculated and compared to the previously obtained for MCF-7 line; results were correlated with the functional properties of cells based on gene expression (in silico GSEA). In vivo acute toxicity was studied in 50 female C57Bl/6J mice, who received a TS-13 solution in distilled water at various doses by intragastric gavage. LD50 obtained experimentally and predicted in silico using the GUSAR web service were compared. Results and discussion. TS-13 inhibited the proliferation of BT-474 cells in a concentration-dependent manner (exponential approximation, IC50 = 59.5 μM) and was 2.2 times more toxic than for MCF-7 cells. This may be due to functional differences between the BT-474 and MCF-7 lines, as evidenced by the GSEA results. The LD50 value established in the in vivo experiment was 936 mg/kg body weight, the obtained value satisfactorily corresponds to the predicted in silico (561 mg/kg), although in reality the compound turned out to be somewhat less toxic than could be expected based on its structure. Conclusions. A study of the acute toxicity of the new water-soluble monophenol TC-13 allows the classification of it as slightly toxic (toxicity rating level 4) according to the Hodge – Sterner scale) or as moderately hazardous (hazard class 3) according to GOST 12.1.007-76.","PeriodicalId":33781,"journal":{"name":"Sibirskii nauchnyi meditsinskii zhurnal","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-10-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41974168","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
V. V. Сhrishtop, T. Rumyantseva, V. Nikonorova, I. Fateev
A number of clinical studies demonstrate that individual characteristics such as stress tolerance and cognitive ability can be considered not only as diagnostic variables but also as risk factors for severe cerebral hypoperfusion. The aim of the study was to identify the typological features of the effect of physical activity on the behavioral reactions of rats during cerebral hypoperfusion. Material and methods. Cerebral hypoperfusion was modeled by bilateral carotid artery ligation. The study involved 280 rats, divided into equal subgroups, according to sex, stress tolerance and learning capacity. Of these, 112 animals were subjected to daily short-term swimming as a rehabilitation model. Before the simulation, and at 6, 8, 14, 21, 28, 35, 60 and 90 days postoperatively, the animals were tested using a Morris water maze and an “open field” test. Results and discussion. The dynamics of stress resistance and learning ability are related to the periodicity of inflammatory, necrotic, circulatory and reparative remodeling in the model used. After 2-3 months of study, cerebral hypoperfusion causes stabilization of indices characterizing stress resistance and cognitive functions below control values. A decrease in stress resistance begins earlier from day 6 of the study, while the index characterizing cognitive functions first decreases significantly after 3 weeks of study. Factors reducing the damaging effects of cerebral hypoperfusion were female gender, high baseline stress tolerance and learning ability. When assessing learning ability under physical load, animals with high baseline cognitive development showed earlier recovery dynamics during urgent adaptation and a significant increase during long-term adaptation.
{"title":"Influence of physical loading on behavioral reactions of rats in cerebral hypoperfusion","authors":"V. V. Сhrishtop, T. Rumyantseva, V. Nikonorova, I. Fateev","doi":"10.18699/ssmj20220506","DOIUrl":"https://doi.org/10.18699/ssmj20220506","url":null,"abstract":"A number of clinical studies demonstrate that individual characteristics such as stress tolerance and cognitive ability can be considered not only as diagnostic variables but also as risk factors for severe cerebral hypoperfusion. The aim of the study was to identify the typological features of the effect of physical activity on the behavioral reactions of rats during cerebral hypoperfusion. Material and methods. Cerebral hypoperfusion was modeled by bilateral carotid artery ligation. The study involved 280 rats, divided into equal subgroups, according to sex, stress tolerance and learning capacity. Of these, 112 animals were subjected to daily short-term swimming as a rehabilitation model. Before the simulation, and at 6, 8, 14, 21, 28, 35, 60 and 90 days postoperatively, the animals were tested using a Morris water maze and an “open field” test. Results and discussion. The dynamics of stress resistance and learning ability are related to the periodicity of inflammatory, necrotic, circulatory and reparative remodeling in the model used. After 2-3 months of study, cerebral hypoperfusion causes stabilization of indices characterizing stress resistance and cognitive functions below control values. A decrease in stress resistance begins earlier from day 6 of the study, while the index characterizing cognitive functions first decreases significantly after 3 weeks of study. Factors reducing the damaging effects of cerebral hypoperfusion were female gender, high baseline stress tolerance and learning ability. When assessing learning ability under physical load, animals with high baseline cognitive development showed earlier recovery dynamics during urgent adaptation and a significant increase during long-term adaptation.","PeriodicalId":33781,"journal":{"name":"Sibirskii nauchnyi meditsinskii zhurnal","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-10-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67504304","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A. Ilkanich, V. Darvin, M. G. Ryzhikov, A. V. Oganian
Esophagogastroduodenoscopy (EGDS) is the main way to diagnose bleeding from the upper gastrointestinal tract. Diagnostic accuracy of the study depends on the preparation. Aim of the study was to evaluate the preparation of the upper parts of the digestive tract in case of esophagogastroduodenal bleeding. Material and methods. The retrospective analysis of 2570 case histories was carried out. Gastric lavage through nasogastric tube was carried out in the main group (1299 patients). Preparation for the primary EGDS was not carried out in the control group (1271 patients). A comparison of the number of EGDS performed and the detection of the bleeding source in the control and the main groups as well as the period of investigation up to the detection of the bleeding source were performed. Results. EGDS without preparation of the upper gastrointestinal tract in case of acute bleeding and determination of the diagnosis is possible in 85,6 % of patients. Preparation of the upper gastrointestinal tract for EGDS prolongs the study period by 30–60 minutes, but allows establishing the diagnosis in 93.7 % of cases that is by 8.1 % more than without preparation.
{"title":"Preparing the upper gastrointestinal tract for an esophagogastroduodenoscopy to identify the source of acute bleeding","authors":"A. Ilkanich, V. Darvin, M. G. Ryzhikov, A. V. Oganian","doi":"10.18699/ssmj20220512","DOIUrl":"https://doi.org/10.18699/ssmj20220512","url":null,"abstract":"Esophagogastroduodenoscopy (EGDS) is the main way to diagnose bleeding from the upper gastrointestinal tract. Diagnostic accuracy of the study depends on the preparation. Aim of the study was to evaluate the preparation of the upper parts of the digestive tract in case of esophagogastroduodenal bleeding. Material and methods. The retrospective analysis of 2570 case histories was carried out. Gastric lavage through nasogastric tube was carried out in the main group (1299 patients). Preparation for the primary EGDS was not carried out in the control group (1271 patients). A comparison of the number of EGDS performed and the detection of the bleeding source in the control and the main groups as well as the period of investigation up to the detection of the bleeding source were performed. Results. EGDS without preparation of the upper gastrointestinal tract in case of acute bleeding and determination of the diagnosis is possible in 85,6 % of patients. Preparation of the upper gastrointestinal tract for EGDS prolongs the study period by 30–60 minutes, but allows establishing the diagnosis in 93.7 % of cases that is by 8.1 % more than without preparation.","PeriodicalId":33781,"journal":{"name":"Sibirskii nauchnyi meditsinskii zhurnal","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-10-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44272983","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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