Publications
Below you can find a list of our published research.
Below you can find a list of our published research.
240 results
Cited 33 times since 2011 (2.7 per year) source: EuropePMC
Cardiovascular research, Volume 93, Issue 3, 22 4 2011, Pages 434-444 Connexin43 silencing in myofibroblasts prevents arrhythmias in myocardial cultures: role of maximal diastolic potential. Askar SF, Bingen BO, Swildens J, Ypey DL, van der Laarse A, Atsma DE, Zeppenfeld K, Schalij MJ, de Vries AA, Pijnappels DA
Aims: Arrhythmogenesis in cardiac fibrosis remains incompletely understood. Therefore, this study aims to investigate how heterocellular coupling between cardiomyocytes (CMCs) and myofibroblasts (MFBs) affects arrhythmogeneity of fibrotic myocardial cultures. Potentially, this may lead to the identification of novel anti-arrhythmic strategies. Methods and results: Co-cultures of neonatal rat CMCs and MFBs in a 1:1 ratio were used as a model of cardiac fibrosis, with purified CMC cultures as cont... Abstract
The international journal of cardiovascular imaging, Volume 27, Issue 7, 1 1 2011, Pages 989-993 CMR-determined scar volume: predictive for ventricular tachycardias? van der Wall EE, Zeppenfeld K, Bax JJ, Siebelink HM, Schalij MJ
Cited 10 times since 2011 (0.8 per year) source: EuropePMC
Journal of cardiovascular electrophysiology, Volume 23, Issue 1, 13 2 2011, Pages 74-80 Toward magnetic resonance-guided electroanatomical voltage mapping for catheter ablation of scar-related ventricular tachycardia: a comparison of registration methods. Tao Q, Milles J, VAN Huls VAN Taxis C, Lamb HJ, Reiber JH, Zeppenfeld K, VAN DER Geest RJ
Introduction: Integration of preprocedural delayed enhanced magnetic resonance imaging (DE-MRI) with electroanatomical voltage mapping (EAVM) may provide additional high-resolution substrate information for catheter ablation of scar-related ventricular tachycardias (VT). Accurate and fast image integration of DE-MRI with EAVM is desirable for MR-guided ablation. Methods and results: Twenty-six VT patients with large transmural scar underwent catheter ablation and preprocedural DE-MRI. With diffe... Abstract
Cited 121 times since 2011 (9.5 per year) source: EuropePMC
Circulation. Arrhythmia and electrophysiology, Volume 4, Issue 5, 13 2 2011, Pages 653-659 Epicardial ablation for ventricular tachycardia: a European multicenter study. Della Bella P, Brugada J, Zeppenfeld K, Merino J, Neuzil P, Maury P, Maccabelli G, Vergara P, Baratto F, Berruezo A, Wijnmaalen AP
Background: The purpose of this study was to describe the epicardial percutaneous ablation experience of 6 European high-volume ventricular tachycardia (VT) ablation centers. Methods and results: Data from 218 patients with coronary artery disease (CAD, n=85 [39.0%]), idiopathic dilated of patients with idiopathic VT cardiomyopathy (IDCM, n=67 [30.7%]), arrhythmogenic right ventricular dysplasia/cardiomyopathy (ARCD/C, n=13 [6%]), hypertrophic cardiomyopathy (HCM, n=5 [2.3%]), and absence of str... Abstract
Cited 8 times since 2011 (0.6 per year) source: EuropePMC
Heart rhythm, Volume 9, Issue 1, 5 1 2011, Pages 10-17 Catheter ablation of ventricular tachycardia after left ventricular reconstructive surgery for ischemic cardiomyopathy. Wijnmaalen AP, Roberts-Thomson KC, Steven D, Klautz RJ, Willems S, Schalij MJ, Stevenson WG, Zeppenfeld K
Background: After surgical ventricular restoration (SVR) for ischemic cardiomyopathy, ventricular tachycardias (VTs) are an important reason for postoperative morbidity and mortality. Objective: The purpose of this study was to elucidate the VT substrate, VT characteristics, and outcome of radiofrequency catheter ablation (RFCA) in patients with VT after SVR. Methods: Twelve (3%) of 416 patients referred for RFCA for VT after myocardial infarction in three centers had undergone SVR. After induct... Abstract
Cited 48 times since 2011 (3.7 per year) source: EuropePMC
Europace : European pacing, arrhythmias, and cardiac electrophysiology : journal of the working groups on cardiac pacing, arrhythmias, and cardiac cellular electrophysiology of the European Society of Cardiology, Volume 13, Issue 11, 28 4 2011, Pages 1533-1540 Prognostic value of total atrial conduction time estimated with tissue Doppler imaging to predict the recurrence of atrial fibrillation after radiofrequency catheter ablation. den Uijl DW, Gawrysiak M, Tops LF, Trines SA, Zeppenfeld K, Schalij MJ, Bax JJ, Delgado V
Aims: Total atrial activation time has been identified as an independent predictor of new-onset atrial fibrillation (AF). Echocardiographic assessment of PA-TDI duration provides an estimation of total atrial conduction time. The aim of this study was to investigate the prognostic value of total atrial conduction time to predict AF recurrence after radiofrequency catheter ablation (RFCA). Methods and results: In 213 patients undergoing RFCA for symptomatic drug-refractory paroxysmal AF, the tota... Abstract
Cited 21 times since 2011 (1.6 per year) source: EuropePMC
Netherlands heart journal : monthly journal of the Netherlands Society of Cardiology and the Netherlands Heart Foundation, Volume 19, Issue 6, 1 1 2011, Pages 290-296 Founder mutations in the Netherlands: familial idiopathic ventricular fibrillation and DPP6. Postema PG, Christiaans I, Hofman N, Alders M, Koopmann TT, Bezzina CR, Loh P, Zeppenfeld K, Volders PG, Wilde AA
In this part of a series on founder mutations in the Netherlands, we review familial idiopathic ventricular fibrillation linked to the DPP6 gene. Familial idiopathic ventricular fibrillation determines an intriguing subset of the inheritable arrhythmia syndromes as there is no recognisable phenotype during cardiological investigation other than ventricular arrhythmias highly associated with sudden cardiac death. Until recently, it was impossible to identify presymptomatic family members at risk... Abstract
Cited 11 times since 2011 (0.8 per year) source: EuropePMC
Circulation. Arrhythmia and electrophysiology, Volume 4, Issue 4, 11 2 2011, Pages 486-493 ECG identification of scar-related ventricular tachycardia with a left bundle-branch block configuration. Wijnmaalen AP, Stevenson WG, Schalij MJ, Field ME, Stephenson K, Tedrow UB, Koplan BA, Putter H, Epstein LM, Zeppenfeld K
Background: A left bundle-branch block (LBBB)-like pattern with a dominant S-wave in V(1) is common in idiopathic ventricular arrhythmias (VA). Discrimination between idiopathic and scar-related LBBB pattern VA has important clinical implications. We hypothesized that the VA QRS morphology is influenced by the presence of ventricular scar, allowing ECG discrimination of VA arising from structurally normal versus scarred myocardium. Methods and results: Twelve-lead ECGs of 297 LBBB pattern monomo... Abstract
Cited 2 times since 2011 (0.2 per year) source: EuropePMC
Minerva cardioangiologica, Volume 59, Issue 2, 1 1 2011, Pages 149-169 Ventricular tachycardia ablation: indications and techniques. Wijnmaalen AP, Zeppenfeld K
Over the last decades indications have broadened and techniques have been developed resulting in an increasing use of catheter ablation for different types of ventricular tachycardia (VT). Due to the high ablation success for non scar-related ventricular arrhythmia (VA) catheter ablation has become a first line therapy for symptomatic idiopathic VA or VA presumed to cause ventricular dysfunction. For the ablation of scar-related VTs individual patient factors and operator experience play an impo... Abstract
Cited 66 times since 2011 (5 per year) source: EuropePMC
Heart (British Cardiac Society), Volume 97, Issue 22, 25 4 2011, Pages 1847-1851 Impact of left atrial fibrosis and left atrial size on the outcome of catheter ablation for atrial fibrillation. den Uijl DW, Delgado V, Bertini M, Tops LF, Trines SA, van de Veire NR, Zeppenfeld K, Schalij MJ, Bax JJ
Background: Left atrial (LA) dilatation is an important risk factor for recurrence of atrial fibrillation (AF) after radiofrequency catheter ablation (RFCA). However, the clinical applications to select patients eligible for RFCA according to LA size is limited. Additional pre-procedural assessment of LA fibrosis might improve patient selection for RFCA. Objective: To investigate the impact of LA size and LA fibrosis on the outcome of RFCA for AF. Methods: One hundred and seventy consecutive pat... Abstract
Cited 3 times since 2011 (0.2 per year) source: EuropePMC
Europace : European pacing, arrhythmias, and cardiac electrophysiology : journal of the working groups on cardiac pacing, arrhythmias, and cardiac cellular electrophysiology of the European Society of Cardiology, Volume 13, Issue 6, 4 1 2011, Pages 770-772 The infarct characteristics on magnetic resonance imaging and ventricular tachycardia: do we see what we need to see? Zeppenfeld K, van der Geest RJ
Cited 25 times since 2011 (1.9 per year) source: EuropePMC
Circulation. Arrhythmia and electrophysiology, Volume 4, Issue 2, 1 1 2011, Pages 195-201 Early reperfusion therapy affects inducibility, cycle length, and occurrence of ventricular tachycardia late after myocardial infarction. Piers SR, Wijnmaalen AP, Borleffs CJ, van Huls van Taxis CF, Thijssen J, van Rees JB, Cannegieter SC, Bax JJ, Schalij MJ, Zeppenfeld K
Background: This study aimed to evaluate the impact of early reperfusion during acute myocardial infarction (MI) on ventricular tachycardia (Vt) inducibility, inducible Vt cycle length (CL), and occurrence of spontaneous Vt late after MI. Methods and results: Five hundred six patients (440 men; age, 63±11 years) with prior MI who underwent electrophysiology study before implantation of an implantable cardioverter-defibrillator for primary or secondary prevention were assessed. Patients were clas... Abstract
Cited 16 times since 2011 (1.2 per year) source: EuropePMC
Heart rhythm, Volume 8, Issue 5, 4 1 2011, Pages 665-671 Reversed polarity of bipolar electrograms for predicting a successful ablation site in focal idiopathic right ventricular outflow tract arrhythmias. van Huls van Taxis CF, Wijnmaalen AP, den Uijl DW, Gawrysiak M, Putter H, Schalij MJ, Zeppenfeld K
Background: Radiofrequency catheter ablation (RFCA) for idiopathic right ventricular outflow tract (RVOT) arrhythmias is typically guided by local activation time (LAT) mapping and unipolar electrogram morphology (QS configuration). However, LAT mapping is limited by the large variation among patients, and the area demonstrating a QS configuration of the unipolar electrogram may be larger than the focal source. Reversed polarity has been proposed as a criterion for guiding RFCA. Objective: The p... Abstract
Cited 54 times since 2011 (4 per year) source: EuropePMC
The American journal of cardiology, Volume 107, Issue 2, 1 1 2011, Pages 243-249 Effect of pulmonary vein anatomy and left atrial dimensions on outcome of circumferential radiofrequency catheter ablation for atrial fibrillation. den Uijl DW, Tops LF, Delgado V, Schuijf JD, Kroft LJ, de Roos A, Boersma E, Trines SA, Zeppenfeld K, Schalij MJ, Bax JJ
Multislice computed tomography (MSCT) is commonly acquired before radiofrequency catheter ablation (RFCA) for atrial fibrillation (AF) to plan and guide the procedure. MSCT allows accurate measurement of the left atrial (LA) and pulmonary vein (PV) dimensions and classification of the PV anatomy. The aim of the present study was to investigate the effect of LA dimensions, PV dimensions, and PV anatomy on the outcome of circumferential RFCA for AF. A total of 100 consecutive patients undergoing R... Abstract
Cited 90 times since 2011 (6.7 per year) source: EuropePMC
Journal of the American College of Cardiology, Volume 57, Issue 3, 1 1 2011, Pages 324-331 Left atrial strain predicts reverse remodeling after catheter ablation for atrial fibrillation. Tops LF, Delgado V, Bertini M, Marsan NA, Den Uijl DW, Trines SA, Zeppenfeld K, Holman E, Schalij MJ, Bax JJ
Objectives: The purpose of this study was to assess left atrial (LA) strain during long-term follow-up after catheter ablation for atrial fibrillation and to find predictors for LA reverse remodeling. Background: The association between LA reverse remodeling and improvement in LA strain after catheter ablation has not been investigated thus far. Methods: In 148 patients undergoing catheter ablation for atrial fibrillation, LA volumes and LA strain were assessed with echocardiography at baseline... Abstract
Cited 29 times since 2011 (2.2 per year) source: EuropePMC
American heart journal, Volume 161, Issue 1, 1 1 2011, Pages 197-203 Natriuretic peptide levels predict recurrence of atrial fibrillation after radiofrequency catheter ablation. den Uijl DW, Delgado V, Tops LF, Ng AC, Boersma E, Trines SA, Zeppenfeld K, Schalij MJ, van der Laarse A, Bax JJ
Background: the presence of atrial fibrillation (AF) is related to increased levels of natriuretic peptides. In addition, increased natriuretic peptide levels are predictive of the development of AF. However, the role of natriuretic peptides to predict recurrence of AF after radiofrequency catheter ablation (RFCA) is controversial. Objective: the study aimed to investigate the role of natriuretic peptides in the prediction of AF recurrence after RFCA for AF. Methods: pre-procedural amino-termina... Abstract
Cited 10 times since 2010 (0.7 per year) source: EuropePMC
American heart journal, Volume 160, Issue 4, 1 1 2010, Pages 729-736 Longitudinal mechanics of the periinfarct zone and ventricular tachycardia inducibility in patients with chronic ischemic cardiomyopathy. Bertini M, Ng AC, Borleffs CJ, Delgado V, Wijnmaalen AP, Nucifora G, Ewe SH, Shanks M, Thijssen J, Zeppenfeld K, Biffi M, Leung DY, Schalij MJ, Bax JJ
Background: Quantification of segmental left ventricular (LV) strain by speckle-tracking echocardiography can identify transmural infarcts in patients with chronic ischemic cardiomyopathy. The aim of the study was to explore the relationship between the LV longitudinal peak systolic strain (LPSS) of the infarct, periinfarct, and remote zones and monomorphic ventricular tachycardia (VT) inducibility on electrophysiologic (EP) study. Methods: A total of 134 patients with chronic ischemic cardiomyo... Abstract
Cited 107 times since 2010 (7.9 per year) source: EuropePMC
European heart journal, Volume 32, Issue 1, 23 4 2010, Pages 104-114 Head-to-head comparison of contrast-enhanced magnetic resonance imaging and electroanatomical voltage mapping to assess post-infarct scar characteristics in patients with ventricular tachycardias: real-time image integration and reversed registration. Wijnmaalen AP, van der Geest RJ, van Huls van Taxis CF, Siebelink HM, Kroft LJ, Bax JJ, Reiber JH, Schalij MJ, Zeppenfeld K
Aims: Substrate-based ablation of ventricular tachycardia (VT) relies on electroanatomical voltage mapping (EAVM). Integration of scar information from contrast-enhanced magnetic resonance imaging (CE-MRI) with EAVM may provide supplementary information. This study assessed the relation between electrogram voltages and CE-MRI scar characteristics using real-time integration and reversed registration. Methods and results: Fifteen patients without implantable cardiac defibrillator (14 males, 64 ±... Abstract
Cited 52 times since 2010 (3.8 per year) source: EuropePMC
Heart (British Cardiac Society), Volume 96, Issue 16, 1 1 2010, Pages 1275-1280 Beneficial effects of catheter ablation on left ventricular and right ventricular function in patients with frequent premature ventricular contractions and preserved ejection fraction. Wijnmaalen AP, Delgado V, Schalij MJ, van Huls van Taxis CF, Holman ER, Bax JJ, Zeppenfeld K
Background: Improvement of left ventricular ejection fraction (LVEF) after radiofrequency catheter ablation (RFCA) of frequent premature ventricular contractions (PVCs) has been reported. However, most patients with frequent PVCs have a normal LVEF. In these patients subtle and early forms of PVC-induced left and right ventricular (RV) impairment may not be detected by standard echocardiographic techniques. Objective: To assess the effect of frequent PVCs on ventricular function in patients with... Abstract
Cited 34 times since 2010 (2.5 per year) source: EuropePMC
Magnetic resonance in medicine, Volume 64, Issue 2, 1 1 2010, Pages 586-594 Automated segmentation of myocardial scar in late enhancement MRI using combined intensity and spatial information. Tao Q, Milles J, Zeppenfeld K, Lamb HJ, Bax JJ, Reiber JH, van der Geest RJ
Accurate assessment of the size and distribution of a myocardial infarction (MI) from late gadolinium enhancement (LGE) MRI is of significant prognostic value for postinfarction patients. In this paper, an automatic MI identification method combining both intensity and spatial information is presented in a clear framework of (i) initialization, (ii) false acceptance removal, and (iii) false rejection removal. The method was validated on LGE MR images of 20 chronic postinfarction patients, using... Abstract