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Bojan N. Joksimović

Društvene mreže:

Nasta Manojlović, B. Mijovic, Zlatko Maksimović, Dragana Sokolović, Sanda Lazić, L. Bojanić, Dragana Drakul, Nenad Lalović, Marija Lukić et al.

<p><strong>Introduction. </strong>Antibiotic resistance is a major threat to public health globally. The aim was to examine the impact of the COVID-19 pandemic on the distribution and antimicrobial resistance of pathogenic microorganisms isolated from samples&nbsp;<br />obtained during standard hospital care in one hospital center. &nbsp;<br /><strong>Methods.</strong> Data were obtained retrospectively from a database of the hospital microbiology laboratory. Study sample consisted of 3012 samples tested before the pandemic in 2019 and 3130 samples from the pandemic period in 2021.&nbsp;<br /><strong>Results.</strong> There was no statistically significant difference in the occurrence of agents that were resistant to all antibiotics between the observed years, but there was the difference in the occurrence of those agents between departments, with the highest frequency in the intensive care unit and the COVID-19 department (p&lt;0.001). Isolation of Acinetobacter bacteria increased 2.7 times, and Clostridioides difficile 6.4 times during 2021 compared to 2019. Statistically significant differences were registered in resistance to: imipenem, piperacillin-tazobactam, ceftayidime, cefepime, glycopeptides, aminoglycosides, levofloxacin and ciprofloxacin in 2021 compared to 2019.&nbsp;<br /><strong>Conclusion. </strong>Our results suggest possible influence of COVID-19 on antimicrobial resistance and input a need for a new larger study addressing this issue.</p>

Vladimir Turuntaš, Silvio de Luka, Jasna L. Ristić-Djurovic, S. Ćirković, Drago M. Djordjevich, Sinisa Ristic, Nenad Lalović, Veljko Marić, Bratislav Lazić et al.

In contrast to electromagnetic fields, static magnetic fields (SMFs) have not been extensively studied in terms of their potential health consequences. Although upward- and downward-oriented magnetic poles may cause various biological effects, only the pole with the upward orientation has been mainly investigated. Considering that the interaction of antigen-presenting cells (APCs) and T lymphocytes is crucial to trigger an immune response, we assessed the effect of long-term exposure of human T lymphocytes and dendritic cells (DCs) to moderate strength SMFs of different orientations focusing on the cytokine profile of activated T cells. Cultures of allogenic T lymphocytes and DCs (immature and matured by TLR3 and TLR7 agonists) were continuously exposed to four SMFs. The intensity of the applied field was 1 militesla (mT) or 56 mT of the upward- and downward-oriented pole of the SMF. Cell culture supernatants were assayed for IFN-γ, IL-4, IL-17, TNF-α, TNF-β, IL-1 β, IL-6, IL-8, and IL-10 by ELISA or flow cytometry. The upward-oriented 56 mT SMF significantly increased the release of IFN-γ and TNF-β (both p < 0.05) in the cell culture supernatants of T cells and immature DCs. In contrast, the same cultures exposed to the upward-oriented 1 mT SMF showed significantly elevated levels of IL-17 (p < 0.05). The levels of IL-4, TNF-α, IL-1 β, IL-6, IL-8, and IL-10 were not affected by the upward-oriented SMF. The downward-oriented 56 mT SMF increased TNF-α release when T cells were stimulated with mature DCs. The production of other cytokines was unchanged by the downward-oriented SMF. These findings demonstrate for the first time different in vitro biological effects of upward- and downward-oriented static magnetic fields on the cytokine production of T cells activated by DCs, helping to better understand SMF effects on the immune system and suggesting that the selective SMF effect on the immune response could have potential therapeutic effects in different immune-mediated disorders.

Halogenated boroxine K2[B3O3F4OH] (HB), an inorganic derivative of cyclic anhydride of boronic acid, is patented as a boron-containing compound with potential for the treatment of both benign and malignant skin changes. HB has effectively inhibited the growth of several carcinoma cell lines. Because of the growing interest in autophagy induction as a therapeutic approach in bladder carcinoma (BC), we aimed to assess the effects of HB on metabolic phenotype and autophagy levels in 5637 human bladder carcinoma cells (BC). Cytotoxicity was evaluated using the alamar blue assay, and the degree of autophagy was determined microscopically. Mitochondrial respiration and glycolysis were measured simultaneously. The relative expression of autophagy-related genes BECN1, P62, BCL-2, and DRAM1 was determined by real-time PCR. HB affected cell growth, while starvation significantly increased the level of autophagy in the positive control compared to the basal level of autophagy in the untreated negative control. In HB-treated cultures, the degree of autophagy was higher compared to the basal level, and metabolic phenotypes were altered; both glycolysis and oxidative phosphorylation (OXPHOS) were decreased by HB at 0.2 and 0.4 mg/mL. Gene expression was deregulated towards autophagy induction and expansion. In conclusion, HB disrupted the bioenergetic metabolism and reduced the intracellular survival potential of BC cells. Further molecular studies are needed to confirm these findings and investigate their applicative potential.

Milica Milentijević, Nataša Katanić, Bojan Joksimović, Aleksandar Pavlović, Jelena Filimonović, Milena Anđelković, Ksenija Bojović, Z. Elek, Sinisa Ristic et al.

Background: Severe coagulation abnormalities are common in patients with COVID-19 infection. We aimed to investigate the relationship between pro-inflammatory cytokines and coagulation parameters concerning socio-demographic, clinical, and laboratory characteristics. Methods: Our study included patients hospitalized during the second wave of COVID-19 in the Republic of Serbia. We collected socio-demographic, clinical, and blood-sample data for all patients. Cytokine levels were measured using flow cytometry. Results: We analyzed data from 113 COVID-19 patients with an average age of 58.15 years, of whom 79 (69.9%) were male. Longer duration of COVID-19 symptoms before hospitalization (B = 69.672; p = 0.002) and use of meropenem (B = 1237.220; p = 0.014) were predictive of higher D-dimer values. Among cytokines, higher IL-5 values significantly predicted higher INR values (B = 0.152; p = 0.040) and longer prothrombin times (B = 0.412; p = 0.043), and higher IL-6 (B = 0.137; p = 0.003) predicted longer prothrombin times. Lower IL-17F concentrations at admission (B = 0.024; p = 0.050) were predictive of higher INR values, and lower IFN-γ values (B = −0.306; p = 0.017) were predictive of higher aPTT values. Conclusions: Our findings indicate a significant correlation between pro-inflammatory cytokines and coagulation-related parameters. Factors such as the patient’s level of education, gender, oxygen-therapy use, symptom duration before hospitalization, meropenem use, and serum concentrations of IL-5, IL-6, IL-17F, and IFN-γ were associated with worse coagulation-related parameters.

Radenko Ivanović, Bojan Joksimović, Vladimir Čančar, Helena Marić, Draženka Matović, Nenad Lalović, Radiša Pavlović, Miloš N. Milosavljević, Jovana Milosavljević et al.

Background : Abnormal uterine bleeding (AUB) is one of the most common health problems encountered in women of the peri-menopausal age group. The aim of this study was to investigate the characteristics of functional AUB in perimenopausal women, and to identify predictors of the occurrence of functional AUB in perimenopausal women. Methods : This was a cross-sectional study that included 45 women with complaints of AUB admitted to the gynecology ward in the University Hospital in Foča, and 45 women without AUB who underwent a gynecological examination in the Primary Health Center in Foča, Bosnia and Herzegovina. We included women with AUB who had a normal ultrasound finding without obvious genital or cervical lesions, and who were not on hormonal therapy. The existence of AUB was determined on the basis of a clinical examination by a gynecologist and existing medical documentation. A logistic regression model was used to assess the possible relationship between the occurrence of the functional AUB and the risk factors for its occurrence. Results : The mean patient age was 48.38 ± 2.40 years. There was no significant difference in age, frequency of physical activity, or previous use of oral contraceptives between the two groups of patients divided by the presence of the functional AUB in perimenopause. The logistic regression model showed that age ( p = 0.008), high values of body mass index (BMI) ( p = 0.001), consumption of alcohol and cigarettes on a daily basis ( p = 0.001), and hypertension ( p = 0.046) represented significant risk factors associated with functional AUB in perimenopausal women. Conclusions : During routine exams of women approaching menopause, gynecolo-gists should emphasize the harms of smoking and alcohol use, as well as the significance of non-pharmacological and pharmacological methods for the treatment of obesity and hypertension.

Lj. Krsmanović, Nenad Arsovic, D. Bokonjić, Vladimir Nešić, Z. Dudvarski, D. Pavlović, Milena Dubravac Tanasković, Sinisa Ristic, Nikolina Elez-Burnjaković et al.

Background: Frequent episodes of nasal symptoms are the usual clinical manifestations (CM) of allergic rhinitis (AR) and have a significant negative impact on health-related quality of life (HRQoL) in adolescents. The purpose of this cross-sectional study was to test the hypothesis that cytokines in nasal mucus may be associated with HRQoL in adolescents with AR. Methods: European Quality of Life 5 Dimensions 3 Level Version (EQ-5D-3L), “The Adolescent Rhinoconjunctivitis Quality of Life Questionnaire” (AdolRQLQ) and the Total 4 Symptom Score (T4SS) scoring system were administered to 113 adolescents with AR, nonallergic rhinitis (NAR) and to healthy control subjects. Nasal secretions were sampled and tested for 13 cytokines using a multiplex flow cytometric bead assay. Results: The AR group had significantly lower EQ-5D-3L (0.661 ± 0.267 vs. 0.943 ± 0.088; p < 0.001) and higher AdolRQLQ total scores (2.76 ± 1.01 vs. 1.02 ± 0.10; p < 0.001) compared to the control group. The AR group had higher concentrations of IL-1β (p = 0.002), IL-6 (p = 0.031), IL-8 (p < 0.001), IL17-A (p = 0.013) and IL-18 (p = 0.014) compared to the control group, and IL-1β, IL-6, IL17-A and IL-18 were significantly (p < 0.050) increased with disease progression. Cytokines IL-1β, IL-6, as well as severe CM, were identified as significant predictors of lower HRQoL in adolescents with AR. Conclusions: This study identified IL-1β, IL-6, as well as severe CM, as predictors of lower HRQoL in adolescents with AR. However, these results should only serve as a starting point for additional confirmation research.

M. Milić, T. Gazibara, Bojan Joksimović, J. Stevanović, Dragoslav Lazic, Zorica Stanojevic Ristic, Jelena Subaric Filimonovic, N. Radenković, Momcilo Mirkovic et al.

Women were more affected than men during the COVID-19 pandemic. This study aimed to investigate COVID-19-related stress response in adult women and its association with the relevant socioeconomic, lifestyle and COVID-19-related factors. This research was carried out in eight randomly chosen cities from September 2020 to October 2021. To examine stress, we distributed the COVID Stress Scales (CSS) and the Perceived Stress Scale (PSS). Women also fulfilled a general socio-epidemiologic questionnaire. The study included 1,264 women. Most women were healthy, highly educated, employed, married, nonsmokers who consumed alcohol. The average total CSS score suggested a relatively low COVID-19 related stress), while 1.7% of women had CSS ≥ 100. The mean PSS was around the mid-point value of the scale. Older women, who were not in a relationship, didn't smoke, didn't drink alcohol, but used immune boosters, had chronic illnesses and reported losing money during the pandemic had higher CSS scores. A higher level of stress was also experienced by women exposed to the intense reporting about COVID-19, had contact with COVID-19 positive people or took care of COVID-19 positive family members. In this sample of predominantly highly educated women few women experienced very high stress level, probably due to the study timing (after the initial wave) when the pandemic saw attenuated stress levels. To relieve women from stress, structural organization and planning in terms of health care delivery, offsetting economic losses, controlled information dissemination and psychological support for women are needed.

Adnan Osmanspahić, Mile Despotović, Teodora Bošnjak, Goran Mijović, Marija Lukić, Nada Avram, Bojan Joksimović

<p><strong>Introduction. </strong>Long-term care is series of health and social care services provided at home or in an institutional environment to people with reduced functional capacity. Even though it is known that the quality of life (QoL) of elderly is on a lower level when compared to younger people, there is a small amount of information about QoL of long-term health care patients. The aim of our study was to determine the difference in QoL, depression, anxiety and stress of longterm health care users placed in and outside the institution.</p> <p><strong>Methods.</strong> This cross-sectional study included 100 long-term healthcare users, divided in two groups. First group consisted of 50 respondents from primary level of health care and second group consisted of 50 residents of nursing home. The research was conducted in the period from June to July 2022. A general socio-demographic questionnaire, SF-36 health questionnaire for estimating the QoL and the scale of depression, anxiety and stress (DASS-21) were used as instruments in this study.</p> <p><strong>Results. </strong>Respondents who were institutionalized had significantly lower values of domains and summary scores of QoL compared to respondents whose health care took place outside of institutions, where the difference was observed in physical health summary score (37.67&plusmn;6.20% vs. 50.39&plusmn;10.74%, p&lt;0.001), and the mental health summary score (44.87&plusmn;11.82% vs. 51.83&plusmn;16.01%, p =0.015). Respondents who received long-term health care institutionally had significantly (p=0.011) more mild anxiety (12%) and moderate anxiety (34%) compared to respondents who received long-term health care outside the institution (4% vs. 14%).</p> <p><strong>Conclusion. </strong>Our results showed that residents of nursing home had significantly worse physical and mental functioning, as well as more frequent occurrence of anxiety symptoms compared to users of longterm health care placed outside institutions, in home environment.</p>

Svjetlana Subotić, Nikolina Elez-Burnjaković, Sinisa Ristic, Bojan Joksimović, Goran Stevanović, Jovan Kulić

<p>Bacterial resistance to antibiotics is a problem that arose simultaneously with the beginning of their use and on a global level represents one of the biggest threats to public health. At the beginning of the twenty-first century, the emphasis of the medical and pharmaceutical public is on Gram-negative bacteria, especially enterobacteria, which show resistance to most, and some to all, available antibiotics. Treatment of infections caused by multiresistant bacteria is a big challenge for clinicians. Although bacterial resistance to antibiotics is a global problem, resistance rates vary significantly from country to country, and when it comes to hospital pathogens, from institution to institution. Monitoring antibiotic resistance in one&rsquo;s own environment is one of the first steps in the prevention and control of infections caused by multiresistant bacteria.</p>

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