Introduction: Heart rhythm disorders are quite common in the clinical course of acute myocardial infarction and have a significant influence on the prognosis of the disease. Aim: To investigate the type and frequency of ventricular arrhythmias in patients with acute myocardial infarction (AMI) by sex and age, according to localization of myocardial infarction, and correlated with troponin and C reactive protein (CRP). Material and Methods: A prospective, analytical, comparative clinical study was performed. A total of 100 patients was included who were hospitalized at the Clinic for Heart Disease and Rheumatism at the Clinical Center University of Sarajevo for a period of 6 months, of both sexes, aged from 20 to 90 years. The occurrence of ventricular arrhythmias, CRP and troponin, were observed in relation to the localization (anterior and inferior myocardial wall). Results: It was found that men are more represented in comparison to women and that the largest number of males were in the age group of 51-60 years of life and women in the age group of 71-80 years. It has been established that there is no significant difference between ventricular arrhythmia according to localization of AMI. By determining the mean CRP and troponin levels, a positive correlation was found between CRP and troponin values and recorded ventricular arrhythmias. Conclusion: There is a positive correlation between the troponin and CRP values and ventricular arrhythmias, not related to the localization of AMI, which is important in prevention and planning the treatment of complications of potentially malignant ventricular arrhythmias and fatal outcome at AMI.

The reform of the higher education system and the introduction of the Bologna Process throughout the University of Bosnia and Herzegovina, the PhD study became the next step in education after the completion of an integrated study of medicine.

Background: Chemical pleurodesis is generally accepted palliative dyspnea therapy and preventive of re-accumulation of pleural fluid in patients with malignant pleural effusions. Aim: Comparative analyses of efficiency of chemical pleurodesis between Video Assisted Thoracoscopic Surgery (VATS) and standard thoracostomy. Methods: From 01.01.2016-01.01.2017 at the Clinic for Thoracic Surgery of University Clinical Center (UCC) Sarajevo retrospective analysis was performed. Studied patients underwent VATS pleurodesis (G1) and standard thoracostomy pleurodesis (G2), with 60 in each group, respecting defined inclusion and exclusion criteria. Pleurodesis success was examined radiologically over the next three months. Results: Average age of all patients was 63.97±8.75 years. Gender related, 45% were men and 55% were women (F/M=1.47:1). Average hospitalization was 7.22±1.37 (G1: 6.68±1.16; G2: 7.44±1.40; Mann-Whitney U-test: p=0.0016) days. Average thoracic drainage duration was 5.45±1.69, (G1: 4.28±1.15,G2: 6.05±1.58; Mann-Whitney U-test p<0.0001) days. Pleurodesis success after first month was 98.30% in G1, 91.60% in G2 (G1 vs. G2; p=0.2089); after second month was 98.30% in G1, 78.30% in G2 (G1 vs. G2; p=0.0011) and after three months was 91.60% in G1, 63.30% in G2(G1 vs. G2; p=0.0006). Average dyspnea degree (0-5) after the pleurodesis was 0.050±0.22 in G1 and 0.62±0.76 in G2 (Mann-Whitney U-test; p=0.0001). Complication were noticed in 9.2% patients, in G1 3.3%, 15.0% in G2. Conclusion: Difference in pleurodesis efficiency between the G1 and G2 was established after second month and was even more evident after third month in favor of G1. Results show the significant statistical improvement of the degree of dyspnea in G1 as opposite to the G2.

Background: We examined survival and time until recurrence of disease by multivariant analysis in patients treated for papillary thyroid carcinoma (PTC). Patients and Methods: In the period from January 2003 to January 2018, we analyzed 102 patients with PTC in Public Health Institution–Hospital “Sveti Vracevi” in Bijeljina. Survival and time until recurrence of the disease were analyzed using patients’ general data and factors based on preoperative, intraoperative and postoperative examinations. Many prognostic factors were analyzed together; the AGES prognostic score, consisting of age, grade, extent and size, and the AMES prognostic score, consisting of age, metastases, extent and size. Results: We analyzed 102 patients with PTC. Out of these 87 patients had AGES p.s ≤ 3.99 and 15 patients had AGES p.s> 4. The survival of patients was affected by the presence of distant metastases at the time of diagnosis p = 0.00109 and age p = 0.0436. Recurrence of the disease was recorded in 14 patients. Most patients had recurrence of the disease in the first 5 years after initial surgery. Analyzing the time until recurrence, we concluded that, statistically speaking, AGES p.s> 4 affect recurrence of the disease p = 0.0355 in a significant way, while distant metastases affect it in a very significant way (p = 0.008). Conclusions: Prognostic factors of papillary thyroid carcinoma can be divided into 4 categories, patients’ general data and factors based on preoperative, intraoperative and postoperative examinations.

This paper describes method for lightning current waveform parameters estimation from direct current measurements on remote lightning monitoring system. Proposed signal enhancemed method is based on segmentational multi-step digital signal enhancement in time domain. Performance of proposed waveform parameter estimation has been confirmed in Monte Carlo simulation of three types of synthetic signals corrupted with different levels of additive Gaussian white noise. The proposed approach for noise reduction in time domain offers satisfactory results.

The paper presents the analytics of lightning data collected by monitoring system in real - time for the measurement of the direct lightning current (LAMS) and the lightning location system (LINET). The both systems and their operation mode are shortly described. A great number of collected data are analyzed, explained and compared. The data analyses showed the Lovćen mountain has the overall highest number of registered lightning strokes in the whole analyzed area.

This paper describes a detailed transmission line model for a transient analysis. Line surge arrester energy sharing and importance of complete transmission line modelling is explained. Lightning channel impedance and tower footing resistance are important parameters that influence line surge arrester energy duty. Therefore, energy stresses of transmission line surge arresters due to different values of lightning channel impedance and nonuniform distribution of tower footing resistance are considered.

This paper is dedicated to transient studies on wind turbine blade due to different types of lightning discharges. In order to select the appropriate lightning protection system, it is necessary to identify the parameters of lightning flash. Therefore, measured lightning flashes are presented and analyzed. Simulations have been conducted in EMTP - RV. In the case when lightning hits the blade of wind turbine transient voltage on tower top, voltages on tower footing resistance and on primary side of transformer are considered.

In this paper Failure Mode and Effects Analysis (FMEA) for a large scale multirotor systems (with moving mass) based on novel system for aircraft control will be presented. This system uses four petrol engines for lift and a moving mass system to control the vehicle. Analysis presented in this paper assesses the vulnerabilities of the system during the vehicle operation. The main objective of the analysis is to understand the cause and severity of the failures that can occur to the petrol engines and the moving mass system. Our unmanned aerial vehicle system is used for environmental monitoring and maritime security developed under MORUS project funded under NATO SPS Program. The ultimate goal of our research and design is to make an unmanned aerial vehicle that can lift larger amount of load (approximately 40kg). During its operation time the unmanned aerial vehicle might fail to complete a certain assignment so failure mode and effects analysis is needed to account for such problems and to find appropriate activities to reduce the overall risk the system faces during the mission.

Introduction: Heart failure (HF) has very high rate of repeat hospitalizations due to HF decompensation (HHFD), sometimes very shortly after discharge for acute HF. Aim: The aim of this paper is to investigate rate of HHFD and to identify their possible predictors. Patients and Methods: Total amount of 222 patients hospitalized at Clinic for heart and vessel disease and rheumatism in acute HF were followed for next 18 months for occurrence of HHFD. During hospitalization were collected demographic data, risk factors, routine laboratory tests and admission BNP (brain natriuretic peptide), discharge BNP, percentage change of BNP during hospitalization, high sensitive troponin I, CA125 (cancer antigen125) and cystatin C. Results: In next 18 months 129 patients (58.11%) reached end-point HHFD- mean time of its occurrence was 2.2 (95% CI=1.67-2.7) months. Patients with HHFD had more often arterial hypertension (HTA) (p=0.006), had higher BMI (p=0.035) and had higher values of bilirubin, admission BNP (p=0.031), discharge BNP (p <0.001), CA125 (p=0.023) and cystatin C (p=0.028). There was no difference in troponin values (p=0.095), while % reduction of BNP during hospitalization was lower (p<0.001) in group with HHFD. In univariate Cox hazard analysis HTA was positively and BMI negatively correlated with HHFD, while in multivariate Cox hazard analysis independent predictors were HTA (HR 1.6; 95% CI=1.1-2.2; p=0.018) and BMI<25 (HR 1.6; 95% CI=1.1-2.3; p=0.007). In univariate Cox hazard analysis admission BNP, discharge BNP, rise of BNP during hospitalization, CA125 and bilirubin were positively correlated, while sodium was negatively correlated with HHFD. In multivariate Cox hazard analysis there was only one independent predictor of HHFD - discharge BNP (HR 6.05; 95% CI=1.89-19.4; p=0.002). Conclusion: Arterial hypertension, BMI>25 and discharge BNP are independent predictors of HHFD. This could help us to identify high-risk patients for readmission who should be monitored more frequently and treated with sophisticated drug and device therapy.

The power system (PS) evolves with the introduction of new technologies in the sectors of production, transmission, distribution and control of electricity consumption. The philosophy of PS control, operation and management is changing. The public low-voltage network (LVN) faces the major changes due to integration of new smart grid technologies. The integration of photovoltaic power plants (PVPPs) and Energy Storage System (ESS) in LVN is a focus of this paper. Three scenarios are considered: (1) analysis of LVN without PVPPs and ESS, (2) analysis of LVN with PVPPs, where LVN is treated as energy storage (ES), (3) analysis of LVN with PVPPs and ESS. The novel algorithm for ESS control aiming to peak load reduction is presented in the paper. Losses and voltage conditions are analyzed on all LVN buses. The slow voltage variations analysis is carried out according to the EN50160 standard. It was shown that the connection of the ESS has negligible impact on losses in LVN. Slow voltage variations are within limits defined by standard EN50160 for all considered scenarios.

In shared human-robot environments, control systems operate based on the information about both human and robot activities to facilitate the successful collaboration between the two. This paper contributes to the emerging field of human-robot collaboration (HRC) by unifying human action recognition (HAR) and high-level robot control technique into single control system. Approach in this paper includes artificial neural network based classifier for recognition of human activity and task-based control as an example of high-level control technique. Classifier is developed based on the data from wearable sensors attached on the human arms. Recognized human activity is used as the input for the selection of functions that describe robot's activity (task). This papers combines both the theoretical approach to the task-based control and it's synergy with HAR while the developed artificial neural network classifier is experimentally validated.