Publications by authors named "Konstantin Tachkov"

Aims: To evaluate available information on therapeutic drug monitoring (TDM) education programmes and their implementation across different countries.

Methods: The study was performed in two phases. First, a scoping review of scientific literature on available education programmes was performed.

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: In recent years, musculoskeletal ultrasonography (MSUS) has established itself as a reliable method for evaluating disease activity in combination with clinical examination and laboratory tests. : In this pilot study, we aimed to evaluate the ultrasound response to treatment with tofacitinib and upadacitinib on tendons and joints in comparison to clinical and laboratory results in patients with RA who have shown inadequate response to conventional synthetic and/or biologic disease-modifying antirheumatic drugs (cs/b DMARDs). : This study presents the MSUS assessment of therapeutic response in RA patients treated with tofacitinib or upadacitinib over a 24-week period.

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While Electronic Prescription Systems (EPS) adoption varies across EU Member States, there's a lack of comprehensive comparative analysis. Existing studies focus on single EPSs, employ diverse methodologies, and lack up-to-date data. This study fills this gap by providing a comprehensive overview of EPS development, functionalities, and usage statistics in each EU Member State.

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Introduction: This overview paper aims at summarizing and analyzing the available literature on healthcare system organization and pricing policies of 11 European countries, comparing them to the Bulgarian pharmaceutical system. The countries were selected based on the reference basket for the pricing of pharmaceuticals in Bulgaria - Belgium, Greece, Spain, Italy, Latvia, Lithuania, Romania, Slovakia, Slovenia, and France.

Areas Covered: In the first part, we explore the health system models in the above-mentioned countries.

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The aim of this study was to analyze the therapeutic results and survival of patients with myelofibrosis treated with ruxolitinib in comparison with a group on standard therapy. It is a cross-sectional, retrospective, non-interventional, real-life study that was performed between January 2000 and February 2023. Patients treated between 2000 and 2016, before the introduction of ruxolitinib, constituted the control group ( = 45), while those treated after May 2016, after ruxolitinib inclusion, constituted the active group ( = 66).

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Managed entry agreements are applied in almost all European countries in order to improve patients' access to therapy. The current study aims to evaluate the changes in the affordability of biological medicines for patients in Bulgaria during 2019-2022. The study is a top-down macroeconomic analysis of the key economic indicators and reimbursed costs of biologic therapies.

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Clinical pharmacy as an area of practice, education and research started developing around the 1960s when pharmacists across the globe gradually identified the need to focus more on ensuring the appropriate use of medicines to improve patient outcomes rather than being engaged in manufacturing and supply. Since that time numerous studies have shown the positive impact of clinical pharmacy services (CPS). The need for wider adoption of CPS worldwide becomes urgent, as the global population ages, and the prevalence of polypharmacy as well as shortage of healthcare professionals is rising.

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We aimed to explore symptom severity and adherence to therapy for patients with myelofibrosis treated with ruxolitinib in Bulgaria. It is a prospective, non-interventional study performed at the specialized hospital for active treatment of hematological diseases in Sofia during 2022-2023. Date of diagnosis, demographic characteristics, clinical indicators, ruxolitinib dose, and other data points were collected.

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Introduction: Meaningful patient involvement in health technology assessment (HTA) is essential in ensuring that the interests of the affected patient population, their families, and the general public are accurately reflected in coverage and reimbursement decisions. Central and Eastern European (CEE) countries are generally at less advanced stages of implementing HTA, which is particularly true for patient involvement activities. As part of the Horizon2020 HTx project, this research aimed to form recommendations for critical barriers to patient involvement in HTA in CEE countries.

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Background: Artificial intelligence (AI) has attracted much attention because of its enormous potential in healthcare, but uptake has been slow. There are substantial barriers that challenge health technology assessment (HTA) professionals to use AI-generated evidence for decision-making from large real-world databases (e.g.

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Introduction: Ensuring both financial and physical access to medicines is a challenge for the reimbursement system. How countries are currently tackling this challenge is an issue worth exploring in this review paper.

Areas Covered: The review covered three areas of studies such as pricing, reimbursement, and patient access measures.

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Real-world data and real-world evidence (RWE) are becoming more important for healthcare decision making and health technology assessment. We aimed to propose solutions to overcome barriers preventing Central and Eastern European (CEE) countries from using RWE generated in Western Europe. To achieve this, following a scoping review and a webinar, the most important barriers were selected through a survey.

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Objective: This study aims to evaluate the use of STOPP/START criteria in the identification of Potentially inappropriate medication and potential prescribing omissions in older patients with cardiovascular diseases in Bulgaria. Excessive morbidity and mortality has been linked to drug-related problems and increased use of healthcare services and is an understudied problem for Bulgaria.

Materials And Methods: A prospective, questionnaire-based study was conducted among 543 older patients across 25 pharmacies in Bulgaria.

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Central and Eastern European countries (CEEC) have among the highest rates of increase in healthcare expenditure. External reference pricing, generics and biologics price capping, regressive scale for price setting, health technology assessment (HTA), and positive drug lists for reimbursed medicines are among the variety of implemented cost-containment measures aimed at reducing and controlling the rising cost for pharmaceuticals. The aim of our study was to analyze the influence of a recently introduced measure in Bulgaria-budget capping in terms of overall budget expenditure.

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We aimed to systematically review the prevalence of potentially inappropriate prescribing (PIP) in older adults in Central and Eastern Europe (CEE) in all care settings. We searched Embase and MEDLINE (up to June 2019) and checked the reference lists of the included studies and relevant reviews. Eligible studies used validated explicit or implicit tools to assess the PIP prevalence in older adults in CEE.

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Patients' perspectives are important to identify preferences, estimate values and appreciate unmet medical needs in the process of research and development and subsequent assessment of new health technologies. Patient and public involvement in health technology assessment (HTA) is essential in understanding and assessing wider implications of coverage and reimbursement decisions for patients, their relatives, caregivers, and the general population. There are two approaches to incorporating the patients' voice in HTA, preferably used in a mix.

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Article Synopsis
  • The paper explores barriers to using AI in Health Technology Assessment (HTA) systems in Central and Eastern Europe, utilizing a literature review and focus group discussions for insights.
  • Most studies reviewed focus on clinical applications of AI, with a smaller number analyzing regulatory aspects and knowledge transfer, highlighting that many articles describe AI methods rather than their barriers.
  • Barriers found are categorized into data, methodology, technology, regulation, policy, and human factors, with a call for expert opinions to develop recommendations for overcoming these challenges and effectively integrating AI tools into HTA processes.
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Article Synopsis
  • The study examined the effectiveness of various biologic disease-modifying antirheumatic drugs (bDMARDs) and the JAK inhibitor tofacitinib in treating rheumatoid arthritis (RA) at a Bulgarian rheumatology clinic over eight years, involving 174 patients.
  • Results showed significant improvements in disease control and patients' quality of life, as measured by DAS28-CRP, HAQ, and SF-36 scores, after one year of treatment.
  • Among the treatments, golimumab was found to be the most effective in reducing disease activity, while tofacitinib had the greatest impact on quality of life, specifically in HAQ scores.
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Article Synopsis
  • The study identified key barriers to using real-world evidence (RWE) for health technology assessment in Central and Eastern Europe.
  • A mixed methods approach was used, including a literature review and discussions with stakeholders, to categorize barriers into five groups: technical, regulatory, clinical, scientific, and perceptional.
  • The authors recommend further research to develop detailed guidelines that enhance the consistency and standardization of RWE in health technology evaluations.
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Objective: Polypharmacy and inappropriate prescribing are overlooked issues in Bulgaria. We aimed at collecting and analyzing global literature on the most prevalent risk factors and investigating what they could reveal about current practice.

Materials And Methods: A systematic narrative review and meta-analysis was conducted on the topic, investigating the prevalence of polypharmacy, odds of potentially inappropriate medications (PIMs) due to polypharmacy, and the likelihood of developing a drug-related problem (DRP) due to PIMs.

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The growth of public expenditure worldwide has set the priority on assessment of trends and establishment of factors which generate the most significant public costs. The goal of the current study is to review the tendencies in public healthcare expenditures in Bulgaria and to analyze the influence of the demographic, economic, and healthcare system capacity indicators on expenditures dynamics. A retrospective, top-down, financial analysis of the healthcare system expenditures was performed.

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Background: Diabetes mellitus rates and associated costs continue to rise across Europe enhancing health authority focus on its management. The risk of complications is enhanced by poor glycaemic control, with long-acting insulin analogues developed to reduce hypoglycaemia and improve patient convenience. There are concerns though with their considerably higher costs, but moderated by reductions in complications and associated costs.

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Background: Parkinson's disease (PD), which occurs in 1% of the population, is the second most common neurodegenerative disorder. Despite the broad spectrum of PD manifestations and high disease prevalence, there are insufficient data on medicine utilization and prescription strategies. The purpose of the current study was to analyze published data concerning treatment approaches and to compare them with Bulgarian therapeutic practice.

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