1. Child-parent cascade screening for familial hypercholesterolemia in Slovenia : insights from the pilot programJaka Šikonja, Kaja Kobale, Jan Kafol, Barbara Čugalj Kern, Matej Mlinarič, Ana Drole Torkar, Jernej Kovač, Matija Cevc, Zlatko Fras, Tadej Battelino, Urh Grošelj, 2025, izvirni znanstveni članek Povzetek: Background and aims: Cascade familial hypercholesterolemia (FH) screening of parents could reduce the burden cardiovascular disease (CVD) in relatives of index cases by enabling timely diagnosis of FH. Here, we present the positive outcomes of the pilot child-parent cascade screening program in Slovenia. Methods: One hundred and thirty-eight parents from 123 families of an index child with genetically confirmed FH were randomly included in the pilot child-parent cascade screening program. Index children were identified through the universal FH screening program in preschool children. Genetic testing using Sanger sequencing was performed for cascade screening to detect (likely) pathogenic variants, previously confirmed in the index child. Results: The success rate of confirming a (likely) pathogenic variant was 77.2 % when the first parent, preferably with higher total cholesterol levels, was tested, and reached 99.1 % when the variant was identified in the first tested parent or when both parents were tested. In the minority of cases (13.8 %), parents had had a clinical diagnosis of FH prior to their child and these had somewhat higher prevalence of CVD compared to parents that were diagnosed after their index child through the pilot program (12.5 % vs. 4.3 %; p = 0.382). Conclusions: In conclusion, the presented pilot child–parent cascade screening program is feasible in clinical practice and shows a high success rate in identifying parents with FH. Parents diagnosed through the program appeared to have a lower prevalence of CVD. However, larger cohorts are needed to confirm these findings. Ključne besede: child-parent screening, cascade screening, familial hypercholesterolemia, cardiovascular disease, Slovenia Objavljeno v DiRROS: 16.12.2025; Ogledov: 92; Prenosov: 51
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2. Predictive value of heart rate variability for postoperative atrial fibrillation in off-pump coronary artery bypass patientsJuš Kšela, Jan Kafol, Viktor Avbelj, Jurij-Matija Kališnik, 2025, izvirni znanstveni članek Povzetek: Background and Objectives: Postoperative atrial fibrillation (AF) is a frequent complication after coronary artery bypass grafting (CABG), and is particularly associated with poor outcomes. Heart rate variability (HRV), a non-invasive marker of autonomic function, has been proposed as a tool to predict AF risk, but its utility in off-pump CABG remains unclear. This study aimed to evaluate the predictive value of preoperative HRV parameters, including nonlinear metrics, for postoperative AF in patients undergoing off-pump CABG. Materials and Methods: We prospectively enrolled 67 patients undergoing elective off-pump CABG. HRV was assessed using 15 min high-resolution ECGs. Linear and nonlinear HRV parameters were analyzed. Postoperative AF was monitored through continuous ECG (days 0–4), daily 12-lead ECGs (days 5–7), and a 24 h Holter ECG on day 7. Statistical comparisons between AF and non-AF groups were performed, and the predictive accuracy was evaluated using ROC analysis. Results: Postoperative AF occurred in 40.3% (n = 27) of patients. Standard HRV measures (total power, frequency components, LF/HF ratio) did not differ significantly between groups. However, preoperative DFA Alpha 1 was significantly lower in patients who developed AF (p = 0.010) and showed the highest predictive value (AUC = 0.725, specificity = 80%). Alpha 1 also remained significantly reduced postoperatively in the AF group. Other nonlinear parameters, such as low and average fractal dimension, were also lower postoperatively in the AF group. Conclusions: Traditional HRV parameters showed limited predictive value for postoperative AF following off-pump CABG. The nonlinear DFA Alpha 1 index demonstrated a moderate predictive performance and may serve as a useful marker of autonomic dysregulation. Incorporating nonlinear HRV measures into preoperative assessment may improve AF risk stratification. Ključne besede: DFA Alpha 1, atrial fibrillation, coronary artery bypass grafting, heart rate variability Objavljeno v DiRROS: 15.12.2025; Ogledov: 114; Prenosov: 47
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3. Universal screening for familial hypercholesterolemia in preschool children and their families in Slovenia (FH-FAMILIES) : a protocol for a study of four-stage screening programMia Becker, Bernarda Vogrin, Jan Kafol, Barbara Čugalj Kern, Urh Grošelj, 2025, izvirni znanstveni članek Povzetek: Familial hypercholesterolemia (FH) is the most common metabolic disease, with prevalence estimated between 1:250 and 1:300. The affected individuals have a significantly higher risk for developing atherosclerosis and cardiovascular disease (CVD) compared to non-affected individuals. Early CVD can be prevented with early detection and treatment of FH. In Slovenia we have been conducting a national three-staged program of universal screening for FH of preschoolers. Goals: Our goal is to collect data for 5000 children, which is approximately one-quarter of one generation of preschoolers for the year 2023 (n = 5000). Methods: Our study includes both prospective and retrospective components and is a non-interventional cohort study. The prospective component began in 2023, when a questionnaire was distributed to multiple community health centers and outpatient practices in Slovenia. Pediatricians or school medicine specialists completed these questionnaires. The retrospective component involves our research team collecting the remaining necessary data from existing medical records. We are going to follow our algorithm for the implementation of the universal cholesterol screening program and seek all children that will be referred to the Pediatric Lipid Clinic at the University Children’s Hospital, University Medical Centre (UCH-UMC), Ljubljana, for further genetic testing. If a child has a positive genetic result, their parents and siblings will undergo genetic testing. Conclusions: Despite being a common genetic disorder, familial hypercholesterolemia (FH) is still largely underdiagnosed globally; fewer than 10% of affected individuals are thought to be identified. Early detection through effective screening is therefore essential to improve outcomes and prevent premature cardiovascular events. Ključne besede: hypercholesterolemia, universal screening, preschoolers, total cholesterol, genetic testing Objavljeno v DiRROS: 11.12.2025; Ogledov: 145; Prenosov: 58
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4. Gene therapy of rare diseases as a milestone in medicine : overview of the field and report on initial experiences in SloveniaUrh Grošelj, Marko Kavčič, Ana Drole Torkar, Jan Kafol, Duško Lainšček, Roman Jerala, Matjaž Sever, Samo Zver, Gregor Serša, Maja Čemažar, Primož Strojan, Aleš Grošelj, Mojca Žerjav-Tanšek, Špela Miroševič, Simona Ivančan, Tomaž Prelog, David Gosar, Jasna Oražem, Matej Mlinarič, Sara Bertok, Jernej Kovač, Jana Kodrič, Saba Battelino, Marko Pokorn, Alojz Ihan, Janez Jazbec, Tadej Battelino, Damjan Osredkar, 2025, pregledni znanstveni članek Povzetek: Gene therapy has transitioned from a long-awaited promise to a clinical reality, offering transformative treatments for rare congenital diseases and certain cancers, which have a significant impact on patients’ lives. Current approaches focus on gene replacement therapy, either in vivo or ex vivo, mostly utilizing viral vectors to deliver therapeutic genes into target cells. However, refining these techniques is essential to overcome challenges and complications associated with gene therapy to ensure long-term safety and efficacy. Slovenia has witnessed significant advancements in this field since 2018, marked by successful gene therapy trials and treatments for various rare diseases. Significant strides have been made in the field of gene therapy in Slovenia, treating patients with spinal muscular atrophy and rare metabolic disorders, including the pioneering work on CTNNB1 syndrome. Additionally, immune gene therapy, exemplified by IL-12 adjuvant therapy for cancer, has been a focus of research in Slovenia. Through patient-centred initiatives and international collaborations, researchers in Slovenia are advancing preclinical research and clinical trials, paving the way for accessible gene therapies. Establishing clinical infrastructure and genomic diagnostics for rare diseases is crucial for gene therapy implementation. Efforts in this regard in Slovenia, including the establishment of a Centre for Rare Diseases, Centre for the Technologies of Gene and Cell Therapy, and rapid genomic diagnostics, demonstrate a commitment to comprehensive patient care. Despite the promises of gene therapy, challenges remain, including cost, distribution, efficacy, and long-term safety. Collaborative efforts are essential to address these challenges and ensure equitable access to innovative therapies for patients with rare diseases. Ključne besede: gene therapy, rare genetic diseases, Slovenia, CAR-T cells, cancer, immune gene therapy Objavljeno v DiRROS: 04.12.2025; Ogledov: 160; Prenosov: 124
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5. Interplay of anxiety, depression, vascular function, and biomarkers in post-myocardial infarction patientsJan Kafol, Borut Jug, Mojca Božič Mijovski, Jure Tršan, Daniel Košuta, Marko Novaković, 2025, izvirni znanstveni članek Povzetek: Background and aims: Coronary artery disease (CAD) is a leading cause of mortality. Depression and anxiety are common in CAD patients and negatively affect quality of life, physical functioning, and adherence to cardiac rehabilitation (CR) programs. This study aimed to identify possible associations with clinically relevant parameters, vascular function and blood biomarkers. Methods: Participants were consecutively recruited during cardiac rehabilitation intake visits at the University Medical Centre Ljubljana within 4 months of myocardial infarction (MI). Hospital Anxiety and Depression Scale (HADS) scores were analyzed in relation to endothelial function (assessed with flow-mediated dilation), arterial stiffness, and blood biomarkers (fibrinogen, endocan, and brain-derived neurotrophic factor [BDNF]) in post-MI patients. All vascular and biomarker assessments were performed within 5 days of questionnaire completion and prior to the start of rehabilitation. Results: There were 105 patients included in the study. The median age was 56 years (49–62), and 80.0% of participants were male. Clinically relevant anxiety and depression were present in 29.5% and 21.9% of participants, respectively. Anxiety was significantly associated with younger age, higher body mass index, and increased arterial stiffness, with total HADS scores negatively correlated with age. Endothelial function showed no significant associations with HADS scores. Vital signs showed no significant differences, except for slightly higher systolic blood pressure in those with clinically relevant depression. Fibrinogen levels were significantly higher in participants with anxiety and depression, while endocan and BDNF levels were lower in those with anxiety. Conclusion: Depression and especially anxiety are significantly associated with endothelial function and relevant biomarkers in post-MI patients. However, as HADS is a screening tool and not a diagnostic instrument, and given the study’s observational design, findings reflect associations rather than causality. Routine screening and targeted mental health support within CR programs might improve participation, enhance cardiovascular recovery, and optimize long-term outcomes. These findings underscore the clinical importance of psychological assessment in the early post-MI period and support the integration of mental health evaluation into cardiovascular care. Ključne besede: anxiety, depression, cardiac rehabilitation, coronary artery disease, myocardial infarction, pulse-wave velocity, endothelial dysfunction Objavljeno v DiRROS: 24.11.2025; Ogledov: 165; Prenosov: 94
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6. Sex differences in cholesterol levels among prepubertal childrenJan Kafol, Mia Becker, Barbara Čugalj Kern, Jaka Šikonja, Matej Mlinarič, Katarina Sedej, Matej Kafol, Ana Drole Torkar, Jernej Kovač, Tadej Battelino, Urh Grošelj, 2025, izvirni znanstveni članek Povzetek: Background and aims: Sex differences in cholesterol levels are well documented in adults and adolescents, but limited data exist for prepubertal children. This study aimed to evaluate innate sex differences in total cholesterol (TC) and low-density lipoprotein cholesterol (LDL-C) levels among prepubertal children, both in the general population and among those with familial hypercholesterolemia (FH). Methods: This cross-sectional study used data from Slovenia’s Universal FH Screening Program. Two populationbased random samples of children undergoing routine cholesterol screening at age 5 years were included from 2014 (N = 3412) and 2023 (N = 4182). In addition, a referred cohort from the Slovenian Hypercholesterolemia Registry (n = 1160, aged <10 years) who underwent genetic testing was analyzed. Results: In both the 2014 and 2023 cohorts, girls had significantly higher TC levels than boys (median difference: 0.10–0.11 mmol/L; p < 0.05). Among FH-negative children in the Registry, girls had on average 0.14 mmol/L higher TC and 0.13 mmol/L higher LDL-C than boys (both p < 0.05). No sex differences were observed in FHpositive children (p = 0.83 for TC; p = 0.82 for LDL-C). In the overall Registry cohort, after adjusting for FH status, girls had 0.11 mmol/L higher TC and 0.10 mmol/L higher LDL-C (both p < 0.05). Conclusion: Prepubertal girls have modestly higher TC and LDL-C than boys, a difference not observed in prepubertal FH-positive children, suggesting that the presence of a pathogenic FH variant may override innate physiological differences in lipid metabolism. These findings support universal early cholesterol screening and suggest that sex-specific reference values may improve early cardiovascular risk assessment in prepubertal FHnegative children. Ključne besede: sex differences, prepubertal children, total cholesterol, low-density lipoprotein cholesterol, familial hypercholesterolemia Objavljeno v DiRROS: 17.11.2025; Ogledov: 175; Prenosov: 83
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7. Enhanced oral glucose tolerance test for early detection of insulin resistance and metabolic complications in children with obesityUrh Grošelj, Jan Kafol, Jaka Šikonja, Matej Mlinarič, Robert Šket, Žiga Iztok Remec, Jernej Kovač, Ana Drole Torkar, Jasna Šuput, Barbka Repič-Lampret, Tadej Battelino, Primož Kotnik, 2025, izvirni znanstveni članek Povzetek: Background and aims: Early detection of insulin resistance (IR) and obesity-related complications is crucial for preventing type 2 diabetes. This study aimed to identify dynamic metabolic biomarkers for more precise early detection of IR and metabolic abnormalities. Methods: This cross-sectional cohort study evaluated IR and metabolic biomarkers in 403 children with obesity (median age 13.18 years, 51.3 % female, 98.5 % with obesity) using an enhanced oral glucose tolerance test (eOGTT). IR was assessed via four indices, with the Matsuda Insulin Sensitivity Index (ISI-M) used as the primary measure. Participants were stratified into quartiles based on ISI-M. Results: Participants with the highest IR (Q1) were older (p = 0.002), had a higher body mass index, were in a more advanced pubertal stage (p < 0.001), and had significantly elevated glucose and insulin levels (p < 0.001 for both) compared to the most insulin sensitive (Q4), with significant differences observed across all quartiles (p < 0.050 for all). Insulin at 120 min demonstrated excellent diagnostic accuracy for IR (AUC=0.958). Triglyceride levels in Q1 showed minimal decline during the eOGTT, while greater declines were observed with increasing insulin sensitivity (p = 0.002 across quartiles), suggesting that a lack of decline in triglycerides may help identify IR. High-sensitivity C-reactive protein levels increased with IR (p = 0.024). Baseline beta-hydroxybutyrate levels were highest in the Q4 and showed the greatest absolute decrease during the eOGTT, compared to Q1 (p < 0.001 for both). Conclusions: We validated established IR markers in children with obesity, while demonstrating that eOGTT may offer improved characterization and earlier identification of those at risk for metabolic complications. Ključne besede: insulin resistance, oral glucose tolerance test, OGTT, metabolic complications, screening, children, adolescents, obesity Objavljeno v DiRROS: 11.11.2025; Ogledov: 233; Prenosov: 103
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