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Student Researchers' Society Topics

Student Researchers' Society Topics

The treatment of the most common sustained cardiac arrhythmia, atrial fibrillation (AF), requires a comprehensive approach. For cases of AF causing symptoms, the implementation of a rhythm control strategy aiming at restoring and maintaining sinus rhythm is recommended. Rhythm control is most effectively achieved through catheter ablation. The goal of catheter ablation in this patient population is the electrical isolation of the pulmonary veins (PVI). In our study, we compare the procedural and follow-up data of PVI procedures performed with two different techniques.

 
 
 
 
 
 

There are two different types of acute myocardial infarction: ST elevation myocardial infarction (STEMI) and non ST-elevation myocardial infarction (NSTEMI). The patophysiological background, the epidemiology and the therapeutic strategies are different in STEMI and NSTEMI. In STEMI percutaneous coronary intervention or thrombolysis should be performed within 90 minutes, however in NSTEMI the percutaneous coronary intervention could be performed within the first 24 and 72 hours, depending on the clinical situation.

Angiography is widely used to assess the severity of coronary lesions. Despite its prevalence and extensive clinical experience with its use, many limitations of angiographic studies are well known. The ischemic significance of stenoses can often only be clarified by direct, invasive intracoronary pressure measurement (FFR). This allows a more accurate identification of the culprit lesion and allows avoiding the unnecessary angioplasty of a hemodynamically insignificant stenosis. 3D reconstruction with digital angiography can help determine the degree of constriction. In these models, virtual FFR values can be determined by simulating flow and pressure values. The aim of the study is to model FFR measurement using coronary angiography and to compare the results.

Catheter ablation treatments may be warranted during pregnancy in selected cases. In our study, we analyze the data of patients who underwent catheter ablation during pregnancy at our institution and compare it with international literature findings.

 

Co-supervisor: Dr. DEBRECENI, Dorottya

Atrial fibrillation is the most common sustained cardiac arrhythmia. The most effective long-term rhythm control can be achieved through catheter ablation. During catheter ablation, isolation of the pulmonary veins is performed, which can be accomplished using various single-shot devices. In our study, we compare the procedural data between cryoballoon-based and electroporation-based catheter ablations.

 
 

Co-supervisor: Dr. DEBRECENI, Dorottya

In selected cases, in patients with atrial fibrillation AV node ablation is performed. These procedures are usually performed with fluoroscopy guidance. However, use of intracardiac echocardiography (ICE) for AV node ablation has become available in recent years. In our study we aim to compare conventional, fluoroscopy-guided vs ICE-guided CTI ablations in patients underwent AV noda ablation due to atrial fibrillation.

The number of transcatheter ablation procedures for atrial fibrillation grows year by year in Hungary. During the procedure pulmonary vein isolation is performed. Lately the cryoballoon technique has become widespread available besides radiofrequency ablation. Moreover, contact force sensing catheters has been available in radiofrequency ablation. In our research the procedures performed by these two different methods will be compared and analyzed.

Co-supervisor: Dr. DEBRECENI, Dorottya

Conventionally, invasive electrophysiology procedures are performed with fluoroscopy guidance, however different ablation approaches became available in the last years. Our study we compare the 3D electroanatomical mapping system guided vs. intracardiac echocardiography guided slow pathway ablation is patients with AVNRTs undergoing catheter ablation.

Co-supervisor: Dr. JÁNOSI, Kristóf

The less common, atypical form of atrial flutter can present diagnostic and therapeutic challenges to the caregiver. As a curative procedure, their catheter ablation is recommended. Interventions may have different locations and patterns of atypical atrial flutter due to its diverse nature, which may influence the choice of an appropriate ablation strategy. In this study, we review data from patients undergoing electrophysiological interventions for atypical atrial flutter.

Co-supervisor: Dr. SZABÓ, Dóra

Sportcardiology is a popular and important topic in these days through the increasing incidence of sudden cardiac death by the young and „healthy” sportsmen. In most cases the cause of sudden cardiac death is an occult cardiac disease. A lot of researches have already shown the differences between the phisiological sport heart and pathological cardiac conditions. In this study we examine sportsmen competing in different sport arts. Special ECG, particular echocardiographic examination furthermore spiroergometry are performing. The sportsmen with pathological results have a heart MRI examination, too. The aim of our examination is to compare the results of different (static or dinamic) sports and to configure a relative fast screening method for the everyday routine of sportsmen’s screening.

Congestive heart failure is a major cause of morbidity and mortality despite recent advances in medical therapy. Recently, we have shown that apelin, a peptide secreted from the myocardium, is one of the most potent endogenous stimulators of cardiac contractility. We aim to characterize the signaling mechanisms underlying the positive inotropic effect of apelin. The newly identified signaling pathways may represent attractive possible targets in the treatment of heart failure.

The indications of percutaneous coronary interventions are addressed, regarding especially the cases of myocardial infarctions and the consequently occurring cardiogenic shocks. In the latter situation, full revascularization plays an important role. The different catheter based techniques are discussed, which are utilized during the diagnostic and interventional part in the catheter based revascularization.

Heart rate variability (HRV) analysis is considered as a non-invasive ECG-based technique for the investigation of autonomic nervous system. Due to the multiple associations of the vegetative nervous system, several factors affect HRV. On one hand it means the wide range of applicability, however, on the other hand, results in low specificity. Accurate measurement requires special study-design, technical conditions and presentation. The topic covers both methodical and clinical investigations including cooperation with other specialties as well.

Acute coronary syndrome results mainly from rupture of an inflamed thin-capped plaque with secondary thrombus formation. A sustained, completely occlusive thrombus typically leads to an ST-segment–elevation myocardial infarction (STEMI). Chemokines and cytokines have been suggested to orchestrate the inflammatory processes during atherogenesis, plaque destabilization, and infarct healing. We aim to identify novel biomarkers (e.g. cytokines and chemokines) of the pathophysiological processes during the various stages of STEMI, which may improve risk stratification in this potentially life-threatening condition.

Co-supervisor: Dr. JÁNOSI, Kristóf

Atrial fibrillation is the most common heart rhythm disorder. As part of our rhythm control strategy, we perform catheter ablation in some patients. In our study, we compare procedural data from patients who underwent preprocedural CT scanning prior to catheter ablation with procedural data from patients who did not undergo imaging prior to catheter ablation.

Co-supervisor: Dr. DEBRECENI, Dorottya

The curative therapy for atrial flutter is the transvenous catheter ablation of the cavotricuspid isthmus. Traditionally, these procedures are performed under fluoroscopy guidance. In our research, we investigate the feasibility, effectiveness, and safety of intracardiac ultrasound-guided, fluoroscopy-free CTI ablations.

 

Several methods are available for the diagnosis of coronary stenosis, of which the detection of the hemodynamic relevance is limited. The most significant developmental need and tendency focus on are techniques that determine the fractional flow reserve (FFR) without the use of an invasive pressure measuring wire by calculating non-invasive virtual fractional flow reserve (vFFR) from a three-dimensional reconstruction of the coronary angiogram. The three-dimensional (3D) geometry of the coronary artery can be analyzed from the coronarography with 3D reconstruction software. Computational fluid dynamics (CFD) allows a comprehensive, in silico study of fluid properties after 3D reconstruction of vascular structures. In addition to the existing study data, it can be assumed that CFD examination of the coronary sections results in the detection of flow parameters that are important for plaque progression.

Co-supervisor: Dr. JÁNOSI, Kristóf

Atrial fibrillation is the most common sustained arrythmia. In some cases, catheter ablation is performed to maintain the sinus rhythm. In our study, we examine the clinical characteristics, procedural data and long-term outcomes of patients underwent pulmonary vein isolation due to persistent atrial fibrillation.

Co-supervisor: Dr. JÁNOSI, Kristóf

Atrial fibrillation is the most common sustained cardiac arrhythmia. Long-term rhythm control strategy can be most effectively achieved through catheter ablation for atrial fibrillation. During the procedures, electrical isolation of the pulmonary veins is performed. If atrial fibrillation recurs after catheter ablation, repeated electrophysiological study and, if necessary, pulmonary vein reisolation are indicated. In our study, we examine the procedural data of patients who have undergone at least 2 catheterizations for atrial fibrillation.

 
 

This study aims to explore the feasibility and effectiveness of remote outpatient care for patients treated with catheter ablation due to atrial fibrillation. By monitoring patients remotely, the goal is to provide continuous support and timely intervention while reducing the need for in-person visits. The study will assess patient outcomes, satisfaction, and overall healthcare efficiency in this novel care model.

 
 

Approximately 5,000 patients undergo catheter ablation procedures each year in our country. The vast majority of these procedures are performed while the patient is awake. In our study, we are investigating the potential use of a VR video application we are developing to reduce the anxiety of patients awaiting surgery.

Co-supervisor: Dr. TAMÁS, Andrea

Pituitary adenylate cyclase activating polypeptide (PACAP) is a multifunctional neuropeptide having cardioprotective effects in various animal models. In our study, we examine the change of the PACAP levels in patients undergoing pulmonary vein isolation due to atrial fibrillation.

In addition to the classical, widespreadly used echocardiographic methods more new, special techniques (tissue Doppler imaging, strain, strain rate) have been developed. Systolic or diastolic functions of both the left and right ventricles as well as the atria are investigated by applying these new techniques in some special diseases (systemic sclerosis, COPD, restrictive cardiomyopathy, etc.) complicated by heart failure. In addition to the echocardiographic methods, serum levels of some biomarkers (e.g. NT-proBNP, galectin-3, VEGF) as well as estimation of the functional capacity (6 minute walk test, cardiopulmonary exercise test) are also used.

Pathologic cardiac hypertrophy is induced by direct mechanical wall stress and by circulating and paracrine/autocrine factors. These factors can activate specific signaling pathways, such as mitogen-activated protein kinases (MAPKs) and calcineurin, which leads to increased expression of certain genes characteristic of cardiac hypertrophy, the so-called fetal gene program. Transcription factors play crucial role in integrating these cytosolic signaling cascades. We aim to characterize the specific functions of GATA-4, NF-κB and STAT3 in the regulation of cardiac hypertrophy in experimental models. Our studies may pave the way for the development of novel strategies in combating adverse remodeling and heart failure.

Gestational diabetes occuring in approximately 7-14% of pregnancies may result in both maternal or foetal complications (preeclampsia, placental insufficiency, premature birth, birth defect). Our aim is to investigate if there is any sign of myocardial or vascular dysfunction even before the diagnosis of gestational diabetes. Echocardiography is performed to examine the systolic and diastolic function of the heart. An easy-to-perform oscillometric method (Arteriograph) will be used to measure arterial stiffness parameters. Laboratory parameters that can reflect the function of the myocardium and the arterial system will also be studied (Nt-proBNP, TNF-alfa, PAI-1, ADMA, adiponectin).

The development of cardiac remodeling is associated with fundamental changes in the molecular programs of the heart including the reactivation of fetal gene programs, deregulation of neurohormonal systems as well as the activation of senescence and various forms of cell death. It has long been considered that these gene programs are primarily under the control of protein-based regulatory systems (i.e. transcription factors and chromatin modifiers). It turned out that ~75% of the human genome is actively transcribed into RNA but only ~2% is translated into proteins. Understanding the functional significance of these non-coding RNA transcripts in versatile cellular processes is the subject of intense investigation. According to the most recent estimates, the human genome encodes for ~2000 different microRNAs and ~56000 long non-coding RNAs. Our main goal is to identify novel cell-type and context-specific interactions between, microRNAs, long non-coding RNAs, and mRNAs in regulating cardiac remodeling using the combination of in silico predictions, in vitro cell culture experiments, and animal models.

Large amount of evidence is now available on the crucial role of preclinical organ damage in determining the cardiovascular risk of individuals. Arterial stiffness parameters are commonly used for this purpose, to identify structural and functional changes of the arteries in the development of atherosclerotic disease. Recent European guidelines (ESC/ESH) recommended the assessment of arterial stiffness, as an evidence of target organ damage. However, measuring arterial stiffness parameters is currently not sufficiently widespread, and thus the information it provides remains desirable but difficult to obtain. According to the same guidelines “it might be more widely recommended if its availability were greater”. Novel developments offer different non-invasive, user friendly examination methods, which could solve this controversy. The aim of our study is overcome these limitations and compare recently validated, time-saving, low expense systems: the carotid Doppler echo-tracking system and the oscillometric equipment with the carciac CT and MRI methods.

During coronarography the identification and characterization of stenosis are important, however there are only indirect information about the histopathological characteristics of these lesions, and the severity of the ischemia could not be judged properly in some cases. The latter could be characterized by the utilization of pressure wire measurements, especially via the fractional flow reserve (FFR). The former could be characterized by the use of intravascular ultrasound (IVUS) and optical coherence tomography (OCT).

Congestive heart failure is a major cause of morbidity and mortality despite recent advances in medical therapy. The most commonly used positive inotropes acting via the cAMP–protein kinase A pathway, beta-adrenergic agonists and phosphodiesterase inhibitors, provide rapid and dramatic improvements in cardiac performance, producing immediate relief of heart failure symptoms; however, the prolonged use of these agents may lead to serious adverse cardiac effects. We aim to study the functional significance of myocardium-derived secreted peptides, the so-called cardiokines, in the regulation of cardiac contractility. The characterized cardiokines and their signaling pathways may offer an attractive approach for treating patients with heart failure.

Acute Coronary Syndrome (ACS) worldwide is the third most commonly reported death among people over 65 years of age. In Europe, every sixth male and seventh female cause of death is myocardial infarction. While in the last 10 years the frequency of ST elevation myocardial infarction has decreased by 30%, and the frequency of ST elevation-free infarction (NSTEMI) has increased substantially.
PCI has proven to be a reliable semi-invasive procedure for these disorders, but high age and its often associated comorbidities may limit its benefit. Earlier studies demonstrated lower success rates and the frequent complications following intervention among elderly. The statistical method of meta-analysis is suitable for summing up the published studies in the subject, which also allows to analyzis of the of the obtained evidences and results.

Co-supervisor: Dr. FUSZ, Katalin

EuroSCORE is one of the most widely used score systems in the cardiac surgery field. Perioperative risk stratification tools are not just for predicting postoperative mortality. The indicators mentioned above and a lot of other score systems are also useful for determining the quality of care in cardiac surgery. In our retrospective study, we examine the medical records of patients who underwent coronary  artery bypass grafting (CABG), aortic valve replacement (AVR), mitral valve replacement (MVR), or had any procedure on the thoracic aorta with or without AVR in our department. The study aimed to  assess the effectiveness of EuroSCORE II in the era of COVID-19 in cardiac surgery.

For atrial fibrillation (AF), the most effective rhythm control is achieved through catheter ablation. The goal of AF ablation is the electrical isolation of the pulmonary veins. Pulmonary vein isolation (PVI) is most commonly performed using point-by-point radiofrequency ablation. If during the procedure, PVI is achieved by closing the ablation rings without additional ablations, it is referred to as first-pass isolation. The aim of our prospective study is to identify predictors that determine first-pass isolation.

 
 
 
 
 

Co-supervisor: Dr. VIDA, Róbert

Postoperative atrial fibrillation (POAF) is a prevalent and concerning complication after cardiac surgery, impacting both patients and the healthcare system. As a result, exploring strategies for preventing POAF has become a critical area of research. The incidence of POAF following cardiac surgical procedures in the available literature is 20-40%. This study delves into the potential of preoperative drug therapy as a preventive measure against POAF and the pivotal role of pharmacists in this context. Through a comprehensive retrospective chart analysis conducted at Our hospital, we aim to elucidate the efficacy, significance, and safety of preoperative medications, while highlighting the contributions of pharmacists in optimizing the patient’s medication.

Preoperative drug therapy has emerged as a potential avenue for reducing the incidence of POAF. Medications such as beta-blockers, amiodarone, and magnesium have demonstrated promise in preventing atrial fibrillation when administered properly before surgery. However, the optimal selection, dosing, and timing of these drugs remain topics of ongoing investigation.

Furthermore, pharmacists play a crucial role in managing preoperative medications, ensuring their appropriate use, and minimizing potential drug interactions or adverse effects. Their expertise in medication management and collaborative approach with the healthcare team can contribute significantly to the success of preoperative drug therapy as a preventative measure against POAF.

This retrospective chart analysis will provide valuable insights into the impact of preoperative medications and the extent of pharmacist involvement in reducing the burden of POAF after cardiac surgery. Understanding these factors can ultimately lead to improved patient outcomes, shorter hospital stays, and enhanced overall quality of life for individuals undergoing cardiac surgery.

In the treatment of the acute myocardial infarction, interventional revascularization through coronary intervention has become of predominant importance. A national network of catheter labs was established to provide early revascularization. Clinical characteristics of patients undergoing treatment for an event of myocardial infarction are recorded by the Hungarian Myocardial Infarction Register. Our goal is to conduct observational clinical studies with the use of register data in order to identify factors influencing the prognosis of myocardial infarct patients.

Increasing scientific evidence shows that early functional impairment of the right ventricle (RV) is an important prognostic factor in conditions with right heart pressure overload, such as pulmonary hypertension (PH). Speckle tracking derived strain echoacardiography is a novel sensitive method to assess RV function. Systemic sclerosis patients are at risk for PH and are undergoing echocardiographic screening in our department. Evaluation of RV function in this population with speckle tracking echocardiography can help detecting patients at risk for adverse prognosis.

Pulmonary hypertension is a condition with heterogenous origin and poor prognosis. The diagnosis and identification of the etiology frequently requires right heart catheterization. During the RHC several parameters of pulmonary circulation is determined. The aim of the project is to clarify prognostic significance of these parameters using clinical follow-up studies.

Congestive heart failure is a major cause of morbidity and mortality despite recent advances in medical therapy. Endothelin-1, a peptide secreted from the myocardium, is one of the most potent endogenous stimulators of cardiac contractility. We aim to characterize the signaling mechanisms underlying the positive inotropic effect of endothelin-1. The newly identified signaling pathways may represent attractive possible targets in the treatment of heart failure.

The role of myocardium-derived nitric oxide (NO) in the regulation of cardiac contractility is highly controversial. Nitric oxide synthase (NOS) catalyzes the formation of NO from L-arginine. We aim to characterize the functional significance of neuronal NOS (nNOS, NOS1) and endothelial NOS (eNOS, NOS3) and the potential downstream mechanisms in modulating the contractile function of the heart under physiological conditions.

Increased production of reactive oxygen species (ROS) has been implicated in the pathogenesis of congestive heart failure. However, emerging evidence suggests a role for ROS in regulating various physiological cellular processes in the myocardium. We aim to characterize the signaling network activated by ROS in the regulation of cardiac contractility under physiological conditions.

Co-supervisor: Dr. JÁNOSI, Kristóf

The curative treatment for atrial flutter is the ablation of the cavotricuspid isthmus. During the ablation, various techniques can be used, including traditional point-by-point ablations and the option to employ a continuous technique known as dragging. In our research, we compare the procedural data between these two techniques.

 

Co-supervisor: Dr. DEBRECENI, Dorottya

Accessory pathways can increase the risk of sudden cardiac death and often contribute to the development of atrioventricular reentry tachycardias. The aim of our study is to examine the clinical parameters of patients undergoing catheter ablation for accessory pathway conduction at our clinic, supplemented with procedural data and long-term follow-up outcomes.

 
 

Co-supervisor: Dr. DEBRECENI, Dorottya

In cases of frequent ventricular extrasystoles causing symptoms or left ventricular dysfunction, catheter ablation is recommended. The aim of the study is to prospectively examine patients undergoing catheter ablation for ventricular extrasystoles at our clinic in order to identify factors that improve the success rate of the ablation.

 
 

Co-supervisor: Dr. TAMÁS, Andrea

Pituitary adenylate cyclase activating polypeptide (PACAP) is a multifunctional neuropeptide having cardioprotective effects in various animal models. We have already shown PAC1 receptors in human heart muscles, and detected that PACAP38-LI and PACAP27-LI are significantly higher in ischemic heart diseases compared with valvular abnormalities in heart tissue samples. Based on the results of the animal experiments of the last decades we assumed that PACAP might have a protective effect against ischemic injury due to its antiapoptotic effect. Moreover, several studies have already proven that there may be a significant correlation between PACAP and the severity of heart failure; furthermore as an antiapoptotic polypeptide, it can influence the progression of heart failure. Based on all of these results we examine cardiac disorders with the etiology of ischemia (such as acute myocardial infarct, ischemic heart disease) and heart failure, furthermore we are going to detect the changes of serum PACAP levels due to the different therapies. ELISA method is used to quantify the PACAP levels in human plasma. With these researches there will be known more details about the exact role of PACAP in the pathomechanism and progression of several cardiac diseases, so it might be a potential biomarker in the future.

Preclinical cardiac arrest (OHCA) is a critical condition associated with high mortality. For the definition of risk groups and the clinical management, it is of essential importance to characterize the properties that predispose to OHCA and negatively influence the clinical outcome. We received the data for our analysis from the Hungarian Myocardial Infarction Register (HUMIR). Patients who were treated with and without OHCA after a myocardial infarction (MI) in the years 2014-2017 and who underwent coronary angiography are analyzed. Multivariate regression analyses are planned to answer the following questions: Are there differences in the characteristics of patients with an MI and an OHCA compared to MI patients without an OHCA? Are there differences in the prognosis of patients with an MI and an OHCA compared to MI patients without an OHCA? What properties and characteristics of MI patients with an OHCA influence mortality and survival compared to MI patients without an OHCA? Does the time component of weekly or working days influence the treatment or outcome of MI patients with OHCA?

In the case of atrial fibrillation (AF), the most effective rhythm control can be achieved through catheter ablation. The goal of AF ablation is the electrical isolation of the pulmonary veins. An important step in the procedures is the so-called transseptal puncture (TSP), which provides access from the right atrium through the interatrial septum into the left atrium. Various methods have been developed for pulmonary vein isolation (PVI) using radiofrequency, point-by-point techniques, with respect to TSP. Our study aims to compare procedural data of PVIs performed with different TSP techniques.

 
 
 
 
 
 

According to the current guidelines of the European Society of Cardiology (ESC), cardiac magnetic resonance imaging (CMR) is an essential noninvasive diagnostic tool in case of cardiomyopathies. CMR provides unique information on morphological and structural cardiac alterations, and myocardial tissue characterisation, enabling to maintain disease specific therapy.

Co-supervisor: Dr. JÁNOSI, Kristóf

In the treatment of atrial fibrillation, the most effective rhythm control strategy can be achieved by catheter ablation. These procedures have traditionally been guided by fluoroscopy, but thanks to recent technological advancements, so-called zero-fluoroscopy techniques, which completely eliminate radiation, have become available. In our prospective study, we will compare the procedural data of catheter ablations performed with these two techniques.