Obesity is a serious medical contition, defined as excessive accumulation of fat. Abdominal fat is recognized as the major risk for obesity related diseases such as: hypertension, dyslipidemia, type 2 diabetes mellitus, coronary heart disease, stroke, non-alcoholic fatty liver disease etc. Fat accumulation is also related to pro-oxidant and pro-inflammatory states. Recently published articles suggest that oxidative stress may be a link between obesity and related complications. Adiposity leads to increased oxidative stress via several multiple biochemical processes such as superoxide generation through the action of NADPH oxidase, glyceraldehyde auto-oxidation, oxidative phosphorylation, protein kinase C (PKC) activation, and polyol and hexosamine pathways. On the other hand, oxidative stress plays a causative role in the development of obesity, by stimulating the deposition of adipose tissue, including preadipocyte proliferation, adipocyte differentiation and growth. Exercise-induced weight loss can improve the redox state by modulating both oxidative stress and antioxidant promoters, which reduce endothelial dysfunction and inflammation.

Summary Background The goal of this study was to assess the oxidative stress status through the values of antioxidant defense parameters: superoxide dismutase (SOD), glutathione peroxidase (GPx), glutathione reductase (GR) and total antioxidant status (TAS), as well as cardiovascular risk factors (total cholesterol, LDL-cholesterol, VLDL-cholesterol, non-HDL-cholesterol and triglycerides), anthropometric parameters (Body mass index-BMI, waist circumference-WC, hipp circumferemce-HC, waist-to-hipp ratio-WHR and inflammatory markers (high sensitive C-reactive protein) in a group of obese adolescents. Methods A total of 238 students of both sexes, age of 22.32 ± 1.85 yr. were included in the study. According to the values of BMI lower and higher than 25 kg/m2 and WC higher and lower than 94 cm (males)/80 cm (females) the tested group of students was divided into 2 subgroups: Group 1 (increased risk for CVD) and Group 2 (lower risk for CVD). Results Significantly reduced SOD and GPx with increased GR, TAS, inflammatory and lipoprotein parameters were obtained in Group 1 compared to Group 2. Significant positive association of hsCRP (OR:1.41; 95%CI 1.08–1.83; P=0.007), TAS (OR:827.2; 95%CI 19.27–35498; P=0.007) and GR (OR:1.13; 95%CI 1.05–1.21; P=0.002) and negative association of GPx (OR:0.97; 95%CI 0.94–1.003; P=0.043) and HDL-cholesterol (OR:0.41; 95%CI 0.176– 0.963; P=0.0014) with cardiovascular risk factors were found in obese students. According to the ROC analysis GR>44.8 U/L, TAS>1.35 mmol/L, hsCRP>1.71 mg/L and HDL-cholesterol <1.13 mmol/L have sufficient predictive ability for cardiovascular disease in obese students. Conclusions Significant association of antioxidant defense parameters with anthropometric, lipid and inflammatory markers in obese students with increased cardiovascular risk suggest that screening of these parameters is necessary and highly recommended.

Summary Background: Cardiovascular disease (CVD) is a major cause of mortality and morbidity in many populations, especially in developed countries. The aim of the study was to analyze the lipid status in a student population at increased risk for CVD in comparison with students who are not at increased risk for CVD. Methods: This study included 238 students from the University of Novi Sad of both sexes (126 men and 112 women), with a mean age of 22.32±1.85 years. According to the body mass index (BMI) lower and higher than 25 kg/m2 and waist circumference (WC) of less and more than 94 cm (80 cm for females) the whole group of 238 students was divided into 2 subgroups: the group at increased risk for CVD (Group 1) and the group at lower risk for CVD (Group 2). Total cholesterol - TCH, triglycerides - TG, high density lipoprotein cholesterol - HDL-c, low density lipoprotein cholesterol - LDL-c, very low-density lipoprotein cholesterol - VLDL-c concentrations were determined and the index of atherosclerosis (IA), established risk factors RF-TCH/HDL-c ratio and non-HDL-c/HDL-c ratio were mathematically calculated. Results: The values of TCH, LDL-c, non-HDL-c, VLDL-c and TG were significantly higher in Group 1 compared to Group 2 (P<0.001). IA, non-HDL-c/HDL-c and RF-TCH/HDL-c ratio were also significantly higher (P<0.001), while HDL-c was significantly lower (p<0.01) in Group 1 compared to controls. These results were not influenced by gender in both groups of subjects. Conclusions: The data suggest that increased anthropometric parameters are followed by increased lipoprotein status in the group of students at increased risk for CVD and screening of the lipid status is necessary in students, especially in those who are at increased risk for CVD.

SUMMARY -Th ere is limited evidence showing that elevated arterial blood pressure in surgical patients may be associated with increased perioperative risk; however, cardiovascular instability frequently occurs during anesthesia. Th e most commonly used anesthetic agents, both intravenous and inhalation ones, produce a decrease in arterial blood pressure. Magnesium, acting as a natural calciumchannel blocker, induces direct and indirect vasodilatation, thus playing a role in the treatment of arterial hypertension. In this research, we assessed the eff ects of magnesium sulfate on cardiovascular stability in patients undergoing diverse planned surgical procedures (abdominal, orthopedic, urology) under general balanced anesthesia, who were diagnosed with arterial hypertension grade 1 and 2. Th e research encompassed 100 patients of both sexes, aged from 20 to 65. Immediately before induction of anesthesia with propofol, the patients in the experimental group (50 study subjects) received 30 mg/ kg bolus dose and magnesium sulfate infusion at 10 mg/kg/h, whereas the subjects in the control group (50 patients) were administered normal saline. Anesthesia was achieved and maintained with sevofl urane, fentanyl and rocuronium. Th e hemodynamic variables of mean arterial pressure and heart rate were measured every fi ve minutes, starting immediately before magnesium infusion. Statistical analysis of the categorized values of mean arterial pressure and heart rate revealed a statistically signifi cant between-group diff erence at 60 th and 90 th minute of anesthesia. In conclusion, magnesium sulfate as an adjuvant to anesthesia in patients with arterial hypertension reduces hemodynamic changes during anesthesia.

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Inaccurate results of laboratory testing are mostly caused by errors in the preanalytical phase. The aim of this retrospective study is monitoring, documenting and preventing errors in the pre-analytical phase in order to provide better health care for patients. The study has been done from 2017 to 2021 and involves monitoring, documenting and preventing errors with aspect to phlebotomy in clinical biochemical laboratory of primary health care, in Students Health Protection Institute. Errors are classified in accordance with IFCC recommendation as quality indicators: insufficient sample volume, inappropriately labeled sample and sample damage. The study has shown that the most common errors are insufficient sample volume and sample damage (0.97 %). Inappropriately labeled samples were significantly lower and completely eliminated during period of study (2017 was 0.34 %, 2021 was 0 %; p<0.01). No significant decrease in number of sample damage (2017-0.50 % -2021-0.30 %) was shown and insufficient sample volume errors (2017-0.43% -2021-0.32%) were constantly persisting during the period of study. Through permanent improvement and application of quality management system (QMS), implementation of certification and accreditation of laboratories according to the ISO15189, 2018-(QM / QA) standards for medical laboratories the entire laboratory testing process can be improved. Implementation of LIS (Laboratory Information System), the standard for POCT-ISO22870: 2006 Point of care testing, along with clear transparent and available procedures, errors in the preanalytical phase can be minimized. Special attention should be paid on errors that continue to exist in the study. With more accurate, precise and valid results, correct and fast diagnosis, satisfied patients can be achieved with a smaller number of errors in pre-analytical phase and the principle of cost benefit can be achieved following the guideline: "no blood sample is better than a bad blood sample".

SummaryBackground: It has been reported that obesity is associated with metabolic syndrome, insulin resistance, cardiovascular risk but also with nonalcoholic fatty liver disease (NAFLD). The prevalence of obesity in children and adolescents is increasing rapidly all over the world. The aim of this study was to analyze the value of liver enzymes: AST, ALT and gGT in a group of obese students in order to establish their correlation to anthropometric parameters such as: BMI (body mass index), WC (waist circumference), HC (hip circumference), and WHR (waist-to-hip ratio) compared to non-obese students who comprised the control group (CG). Methods: In this study, 238 students from the University of Novi Sad of both sexes (126 men and 112 women) with a mean age of 22.32 ± 1.85 years were included. According to the body mass index (BMI) lower and higher than 25 kg/m 2 and waist circumference (WC) lower and higher than 94 cm (80 cm for females) the whole group of 238 students was divided into 2 subgroups: the obese group at increased risk for CVD (Group 1) and the group at lower risk for CVD (Group 2). AST, ALT and gGT activities were determined in fasting blood samples. Results: Statistical processing data revealed significantly higher values of AST, ALT and gGT in the group of students with BMI>25 kg/m 2 , WC>94 cm for males and WC>80 cm for females, HC>108 cm for males and HC>111 cm for females, and WHR>0.90 for males and WHR>0.80 for females (P<0.001). Significant association was established