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Yamamoto T, Takigawa M, Shigeta T, Martin CA, Yamaguchi J, Amemiya M, Ikenouchi T, Negishi M, Kawamura I, Goto K, Nishimura T, Takamiya T, Tao S, Miyazaki S, Goya M, Sasano T. Effect of reference electrode on intracardiac electrograms: Close indifferent electrode vs Wilson central terminal. Heart Rhythm 2024; 21:1382-1389. [PMID: 38460753 DOI: 10.1016/j.hrthm.2024.03.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/12/2023] [Revised: 02/13/2024] [Accepted: 03/04/2024] [Indexed: 03/11/2024]
Abstract
BACKGROUND Unipolar electrograms (uni-EGMs) are an essential part of intracardiac mapping. Although Wilson central terminal (WCT) is conventionally used as a reference for signals, avoidance of contamination by far-field and nonphysiologic signals is challenging. OBJECTIVE The aim of the study was to explore the impact of an intracardiac indifferent reference electrode close to the recording electrodes, in lieu of WCT, on electrograms. METHODS Sinus node activation was mapped in patients undergoing catheter ablation by a multielectrode array with a close indifferent electrode (CIE) embedded in the distal end of the catheter shaft. An equal number of points was sequentially acquired at each site with use of CIE as a reference first and subsequently with WCT. Uni-EGMs, bipolar EGMs, and the earliest activation area (defined as the area activated in the first 10 ms of the beat) were compared between CIE- and WCT-based activation maps. RESULTS Seventeen patients (61 ± 18 years; 76% male) were studied. Uni-EGM voltages acquired with CIE were significantly larger than (n = 11) or comparable to (n = 4) those acquired with WCT. When points from the entire cohort were analyzed altogether, unipolar voltages and their maximum negative dV/dT and bipolar voltages recorded with CIE were significantly larger than those recorded with WCT (2.36 [1.42-3.79] mV vs 1.96 [1.25-3.03] mV, P < .0001; 0.40 [0.18-0.77] mV/s vs 0.35 [0.15-0.71] mV/s, P < .0001; and 1.46 [0.66-2.81] mV vs 1.33 [0.54-2.64] mV, P < .0001, respectively). The earliest activation area was significantly smaller in CIE-based activation maps than in WCT-based ones (0.3 [0.7-1.4] cm2 vs 0.6 [1.0-1.8] cm2, P = .01). CONCLUSION CIE-based maps were associated with an approximately 20% increase in unipolar voltage and may highlight the origin of a focal activation more clearly than WCT-based ones.
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Affiliation(s)
- Tasuku Yamamoto
- Department of Cardiovascular Medicine, Tokyo Medical and Dental University Hospital, Tokyo, Japan
| | - Masateru Takigawa
- Department of Cardiovascular Medicine, Tokyo Medical and Dental University Hospital, Tokyo, Japan; Division of Advanced Arrhythmia Research, Tokyo Medical and Dental University Hospital, Tokyo, Japan.
| | - Takatoshi Shigeta
- Department of Cardiovascular Medicine, Tokyo Medical and Dental University Hospital, Tokyo, Japan
| | - Claire A Martin
- Department of Cardiology, Royal Papworth Hospital, Cambridge, United Kingdom; Department of Medicine, University of Cambridge, Cambridge, United Kingdom
| | - Junji Yamaguchi
- Department of Cardiovascular Medicine, Tokyo Medical and Dental University Hospital, Tokyo, Japan
| | - Miki Amemiya
- Department of Cardiovascular Medicine, Tokyo Medical and Dental University Hospital, Tokyo, Japan
| | - Takashi Ikenouchi
- Department of Cardiovascular Medicine, Tokyo Medical and Dental University Hospital, Tokyo, Japan
| | - Miho Negishi
- Department of Cardiovascular Medicine, Tokyo Medical and Dental University Hospital, Tokyo, Japan
| | - Iwanari Kawamura
- Department of Cardiovascular Medicine, Tokyo Medical and Dental University Hospital, Tokyo, Japan
| | - Kentaro Goto
- Department of Cardiovascular Medicine, Tokyo Medical and Dental University Hospital, Tokyo, Japan; Division of Advanced Arrhythmia Research, Tokyo Medical and Dental University Hospital, Tokyo, Japan
| | - Takuro Nishimura
- Department of Cardiovascular Medicine, Tokyo Medical and Dental University Hospital, Tokyo, Japan
| | - Tomomasa Takamiya
- Department of Cardiovascular Medicine, Tokyo Medical and Dental University Hospital, Tokyo, Japan
| | - Susumu Tao
- Department of Cardiovascular Medicine, Tokyo Medical and Dental University Hospital, Tokyo, Japan
| | - Shinsuke Miyazaki
- Department of Cardiovascular Medicine, Tokyo Medical and Dental University Hospital, Tokyo, Japan; Division of Advanced Arrhythmia Research, Tokyo Medical and Dental University Hospital, Tokyo, Japan
| | - Masahiko Goya
- Department of Cardiovascular Medicine, Tokyo Medical and Dental University Hospital, Tokyo, Japan
| | - Tetsuo Sasano
- Department of Cardiovascular Medicine, Tokyo Medical and Dental University Hospital, Tokyo, Japan
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2
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Weinand N, Hu T, Hasegawa K, Kanagasundram A, Tandri H, Stevenson W, Richardson T. Distribution of myocardial fibrosis in patients with nonischemic cardiomyopathy and ventricular tachycardia based on genetic variant. Heart Rhythm 2024:S1547-5271(24)02821-2. [PMID: 38945504 DOI: 10.1016/j.hrthm.2024.06.047] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/31/2024] [Revised: 06/18/2024] [Accepted: 06/23/2024] [Indexed: 07/02/2024]
Abstract
BACKGROUND Many genetic nonischemic dilated cardiomyopathies (NICMs) cause ventricular tachycardias (VTs) originating from scar substrate identified as areas of low electrogram voltage. Substrate locations vary, and the causes of scar are not well defined. OBJECTIVE This study evaluated VT substrate locations in genetic NICM patients undergoing VT ablation to evaluate spatial relationships between specific variants and substrate locations. METHODS In this retrospective case series analysis, 32 patients (aged 55 ± 16 years; 94% male; left ventricular ejection fraction, 34% ± 13%) with genetic NICM referred for VT ablation between October 2018 and November 2022 at a single medical center were evaluated. Scar locations were defined as areas of low unipolar or bipolar voltage. RESULTS Of the 32 patients evaluated, mutations in TTN (n = 11), LMNA (n = 6), PKP2 (n = 5), MYBPC3 (n = 3), DSP (n = 2), TTR (n = 1), FLNC (n = 1), AGL (n = 1), DES (n = 1), and DSG2 (n = 1) were observed. Substrates associated with mutations in TTN were observed only in basal subregions, predominantly anterior (100%) and septal (50%) regions. LMNA mutations were associated with fibrosis in mid inferolateral (60%) and apical inferolateral (60%) regions. Substrate location for individuals with PKP2 mutations was solely observed in the right ventricle, predominantly basal inferolateral regions. CONCLUSION Understanding spatial relationships between genetic variants causing NICM and VT substrate locations can help lead to generalizable regions in patients with genetically related NICM presenting in VT, which can be investigated during ablation procedures.
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Affiliation(s)
- Nicholas Weinand
- Department of Medicine, Vanderbilt University Medical Center, Nashville, Tennessee
| | - Tiffany Hu
- Cardiovascular Division, Department of Medicine, Vanderbilt University Medical Center, Nashville, Tennessee
| | - Kanae Hasegawa
- Cardiovascular Division, Department of Medicine, Vanderbilt University Medical Center, Nashville, Tennessee; Department of Cardiovascular Medicine, Faculty of Medical Sciences, University of Fukui, Fukui, Japan
| | - Arvind Kanagasundram
- Cardiovascular Division, Department of Medicine, Vanderbilt University Medical Center, Nashville, Tennessee
| | - Harikrishna Tandri
- Cardiovascular Division, Department of Medicine, Vanderbilt University Medical Center, Nashville, Tennessee
| | - William Stevenson
- Cardiovascular Division, Department of Medicine, Vanderbilt University Medical Center, Nashville, Tennessee
| | - Travis Richardson
- Cardiovascular Division, Department of Medicine, Vanderbilt University Medical Center, Nashville, Tennessee.
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3
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Raja DC, Shroff J, Nair A, Abhilash SP, Tuan LQ, Mehta A, Abhayaratna WP, Sanders P, Frankel DS, Marchlinski FE, Pathak RK. Correlation of extent of left ventricular endocardial unipolar low-voltage zones with ventricular tachycardia in nonischemic cardiomyopathy. Heart Rhythm 2024:S1547-5271(24)02392-0. [PMID: 38636932 DOI: 10.1016/j.hrthm.2024.04.065] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/19/2024] [Revised: 04/12/2024] [Accepted: 04/13/2024] [Indexed: 04/20/2024]
Abstract
BACKGROUND Endocardial electrogram (EGM) characteristics in nonischemic cardiomyopathy (NICM) have not been explored adequately for prognostication. OBJECTIVE We aimed to study correlation of bipolar and unipolar EGM characteristics with left ventricular ejection fraction (LVEF) and ventricular tachycardia (VT) in NICM. METHODS Electroanatomic mapping of the left ventricle was performed. EGM characteristics were correlated with LVEF. Differences between groups with and without VT and predictors of VT were studied. RESULTS In 43 patients, unipolar EGM variables had better correlation with baseline LVEF than bipolar EGM variables: unipolar voltage (r = +0.36), peak negative unipolar voltage (r = -0.42), peak positive unipolar voltage (r = +0.38), and percentage area of unipolar low-voltage zone (LVZ; r = -0.41). Global mean unipolar voltage (hazard ratio [HR], 0.4; 95% confidence interval [CI], 0.2-0.8), extent of unipolar LVZ (HR, 1.6; 95% CI, 1.1-2.3), and percentage area of unipolar LVZ (HR, 1.6; 95% CI, 1.1-2.3) were significant predictors of VT. For classification of patients with VT, extent of unipolar LVZ had an area under the curve of 0.82 (95% CI, 0.69-0.95; P < .001), and percentage area of unipolar LVZ had an area under the curve of 0.83 (95% CI, 0.71-0.96; P = .01). Cutoff of >3 segments for extent of unipolar LVZ had the best diagnostic accuracy (sensitivity, 90%; specificity, 67%) and cutoff of 33% for percentage area of unipolar LVZ had the best diagnostic accuracy (sensitivity, 95%; specificity, 60%) for VT. CONCLUSION In NICM, extent and percentage area of unipolar LVZs are significant predictors of VT. Cutoffs of >3 segments of unipolar LVZ and >33% area of unipolar LVZ have good diagnostic accuracies for association with VT.
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Affiliation(s)
- Deep Chandh Raja
- The Australian National University, Australian Capital Territory, Australia; Canberra Heart Rhythm Centre, Australian Capital Territory, Australia
| | - Jenish Shroff
- The Australian National University, Australian Capital Territory, Australia; Canberra Heart Rhythm Centre, Australian Capital Territory, Australia
| | - Anugrah Nair
- The Australian National University, Australian Capital Territory, Australia; Canberra Heart Rhythm Centre, Australian Capital Territory, Australia
| | - Sreevilasam P Abhilash
- The Australian National University, Australian Capital Territory, Australia; Canberra Heart Rhythm Centre, Australian Capital Territory, Australia
| | - Lukah Q Tuan
- The Australian National University, Australian Capital Territory, Australia; Canberra Heart Rhythm Centre, Australian Capital Territory, Australia
| | - Abhinav Mehta
- The Australian National University, Australian Capital Territory, Australia
| | | | - Prashanthan Sanders
- Center for Heart Rhythm Disorders, University of Adelaide and Royal Adelaide Hospital, Adelaide, Australia
| | - David S Frankel
- Section of Cardiac Electrophysiology, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania
| | - Francis E Marchlinski
- Section of Cardiac Electrophysiology, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania
| | - Rajeev Kumar Pathak
- The Australian National University, Australian Capital Territory, Australia; Canberra Heart Rhythm Centre, Australian Capital Territory, Australia.
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Okenov A, Nezlobinsky T, Zeppenfeld K, Vandersickel N, Panfilov AV. Computer based method for identification of fibrotic scars from electrograms and local activation times on the epi- and endocardial surfaces of the ventricles. PLoS One 2024; 19:e0300978. [PMID: 38625849 PMCID: PMC11020530 DOI: 10.1371/journal.pone.0300978] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2023] [Accepted: 03/07/2024] [Indexed: 04/18/2024] Open
Abstract
Cardiac fibrosis stands as one of the most critical conditions leading to lethal cardiac arrhythmias. Identifying the precise location of cardiac fibrosis is crucial for planning clinical interventions in patients with various forms of ventricular and atrial arrhythmias. As fibrosis impedes and alters the path of electrical waves, detecting fibrosis in the heart can be achieved through analyzing electrical signals recorded from its surface. In current clinical practices, it has become feasible to record electrical activity from both the endocardial and epicardial surfaces of the heart. This paper presents a computational method for reconstructing 3D fibrosis using unipolar electrograms obtained from both surfaces of the ventricles. The proposed method calculates the percentage of fibrosis in various ventricular segments by analyzing the local activation times and peak-to-peak amplitudes of the electrograms. Initially, the method was tested using simulated data representing idealized fibrosis in a heart segment; subsequently, it was validated in the left ventricle with fibrosis obtained from a patient with nonischemic cardiomyopathy. The method successfully determined the location and extent of fibrosis in 204 segments of the left ventricle model with an average error of 0.0±4.3% (N = 204). Moreover, the method effectively detected fibrotic scars in the mid-myocardial region, a region known to present challenges in accurate detection using electrogram amplitude as the primary criterion.
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Affiliation(s)
- Arstanbek Okenov
- Department of Physics and Astronomy, Ghent University, Gent, Belgium
| | - Timur Nezlobinsky
- Department of Physics and Astronomy, Ghent University, Gent, Belgium
| | - Katja Zeppenfeld
- Department of Cardiology, Leiden University Medical Centre, Leiden, The Netherlands
| | - Nele Vandersickel
- Department of Physics and Astronomy, Ghent University, Gent, Belgium
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5
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Hayase J, Salama G. A Catheter With a View: Characterizing the Conventional and Microelectrode Intracardiac "Field of View". JACC Clin Electrophysiol 2024; 10:651-653. [PMID: 38520435 DOI: 10.1016/j.jacep.2024.102336] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2024] [Accepted: 01/28/2024] [Indexed: 03/25/2024]
Affiliation(s)
- Justin Hayase
- UCLA Cardiac Arrhythmia Center, David Geffen School of Medicine at UCLA, Los Angeles, California, USA.
| | - Guy Salama
- UCLA Cardiac Arrhythmia Center, David Geffen School of Medicine at UCLA, Los Angeles, California, USA
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6
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Tan JL, Guandalini GS, Hyman MC, Arkles J, Santangeli P, Schaller RD, Garcia F, Supple G, Frankel DS, Nazarian S, Lin D, Callans D, Marchlinski FE, Markman TM. Substrate and arrhythmia characterization using the multi-electrode Optrell mapping catheter for ventricular arrhythmia ablation-a single-center experience. J Interv Card Electrophysiol 2024; 67:559-569. [PMID: 37592198 DOI: 10.1007/s10840-023-01618-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/29/2023] [Accepted: 08/07/2023] [Indexed: 08/19/2023]
Abstract
BACKGROUND The use of a multi-electrode Optrell mapping catheter during ventricular tachycardia (VT) or premature ventricular complex (PVC) ablation procedures has not been widely reported. OBJECTIVES We aim to describe the feasibility and safety of using the Optrell multipolar mapping catheter (MPMC) to guide catheter ablation of VT and PVCs. METHODS We conducted a single-center, retrospective evaluation of patients who underwent VT or PVC ablation between June and November 2022 utilizing the MPMC. RESULTS A total of 20 patients met the inclusion criteria (13 VT and 7 PVC ablations, 80% male, 61 ± 15 years). High-density mapping was performed in the VT procedures with median 2753 points [IQR 1471-17,024] collected in the endocardium and 12,830 points [IQR 2319-30,010] in the epicardium. Operators noted challenges in manipulation of the MPMC in trabeculated endocardial regions or near valve apparatus. Late potentials (LPs) were detected in 11 cases, 7 of which had evidence of isochronal crowding demonstrated during late annotation mapping. Two patients who also underwent entrainment mapping had critical circuitry confirmed in regions of isochronal crowding. In the PVC group, high-density voltage and activation mapping was performed with a median 1058 points [IQR 534-3582] collected in the endocardium. CONCLUSIONS This novel MPMC can be used safely and effectively to create high-density maps in LV endocardium or epicardium. Limitations of the catheter include a longer wait time for matrix formation prior to starting point collection and challenges in manipulation in certain regions.
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Affiliation(s)
- Jian Liang Tan
- Electrophysiology Section, Cardiology Division, Hospital of the University of Pennsylvania, 1 Convention Avenue, Philadelphia, PA, 19104, USA
| | - Gustavo S Guandalini
- Electrophysiology Section, Cardiology Division, Hospital of the University of Pennsylvania, 1 Convention Avenue, Philadelphia, PA, 19104, USA
| | - Matthew C Hyman
- Electrophysiology Section, Cardiology Division, Hospital of the University of Pennsylvania, 1 Convention Avenue, Philadelphia, PA, 19104, USA
| | - Jeffrey Arkles
- Electrophysiology Section, Lancaster Heart Group, Lancaster General Hospital, Lancaster, PA, USA
| | - Pasquale Santangeli
- Cardiac Pacing and Electrophysiology Section, Heart and Vascular Institute, Cleveland Clinic Foundation, Cleveland, OH, USA
| | - Robert D Schaller
- Electrophysiology Section, Cardiology Division, Hospital of the University of Pennsylvania, 1 Convention Avenue, Philadelphia, PA, 19104, USA
| | - Fermin Garcia
- Electrophysiology Section, Cardiology Division, Hospital of the University of Pennsylvania, 1 Convention Avenue, Philadelphia, PA, 19104, USA
| | - Gregory Supple
- Electrophysiology Section, Cardiology Division, Hospital of the University of Pennsylvania, 1 Convention Avenue, Philadelphia, PA, 19104, USA
| | - David S Frankel
- Electrophysiology Section, Cardiology Division, Hospital of the University of Pennsylvania, 1 Convention Avenue, Philadelphia, PA, 19104, USA
| | - Saman Nazarian
- Electrophysiology Section, Cardiology Division, Hospital of the University of Pennsylvania, 1 Convention Avenue, Philadelphia, PA, 19104, USA
| | - David Lin
- Electrophysiology Section, Cardiology Division, Hospital of the University of Pennsylvania, 1 Convention Avenue, Philadelphia, PA, 19104, USA
| | - David Callans
- Electrophysiology Section, Cardiology Division, Hospital of the University of Pennsylvania, 1 Convention Avenue, Philadelphia, PA, 19104, USA
| | - Francis E Marchlinski
- Electrophysiology Section, Cardiology Division, Hospital of the University of Pennsylvania, 1 Convention Avenue, Philadelphia, PA, 19104, USA
| | - Timothy M Markman
- Electrophysiology Section, Cardiology Division, Hospital of the University of Pennsylvania, 1 Convention Avenue, Philadelphia, PA, 19104, USA.
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7
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Verma A, Essebag V, Neuzil P, Dyrda K, Balt J, Dinov B, Darma A, Arya A, Sacher F, Reddy VY, Boersma L, Grigorov I, De Potter T. Cryocure-VT: the safety and effectiveness of ultra-low-temperature cryoablation of monomorphic ventricular tachycardia in patients with ischaemic and non-ischaemic cardiomyopathies. Europace 2024; 26:euae076. [PMID: 38582974 PMCID: PMC10998960 DOI: 10.1093/europace/euae076] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2024] [Accepted: 03/18/2024] [Indexed: 04/08/2024] Open
Abstract
AIMS The ultra-low-temperature cryoablation (ULTC) ablation system using -196°C N2 cryogen has been reported to create lesions with freeze duration-dependent depth titratable to over 10 mm with minimum attenuation by scar. Cryocure-VT (NCT04893317) was a first-in-human clinical trial evaluating the safety and efficacy of a novel, purpose-built ULTC catheter in endocardial ablation of scar-dependent ventricular tachycardias (VTs). METHODS AND RESULTS This prospective, multi-centre study enrolled patients referred for de novo or second ablations of recurrent monomorphic VT of both ischaemic and non-ischaemic aetiologies. Primary safety and efficacy endpoints of the study were freedom from device- or procedure-related major adverse events (MAEs) up to 30 days post-ablation, acute non-inducibility of clinical VTs at the end of the procedure, and freedom from sustained VT or implantable defibrillator intervention at 6 months. Ultra-low-temperature cryoablation was performed in 64 patients (age 67 ± 11 years, 78% ischaemic, ejection fraction = 35 ± 10%) at 9 centres. The primary acute effectiveness endpoint was achieved in 94% (51/54) of patients in whom post-ablation induction was attempted. There were no protocol-defined MAEs; four procedure-related serious adverse events resolved without clinical sequelae. At 6-month follow-up, 38 patients (60.3%) remained VT-free, and freedom from defibrillator shock was 81.0%, with no significant difference between ischaemic and non-ischaemic cohorts. In 47 patients with defibrillator for at least 6 months prior to the ablation, the VT burden was reduced from median of 4, inter-quartile range (IQR, 1-9) to 0, IQR (0-2). CONCLUSION In this first-in-human multi-centre experience, endocardial ULTC ablation of monomorphic VT appears safe and effective in patients with both ischaemic-cardiomyopathy and non-ischaemic-cardiomyopathy. CLINICAL TRIAL REGISTRATION NCT04893317.
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Affiliation(s)
- Atul Verma
- Division of Cardiology, McGill University Health Centre, D13.173, 1650 Cedar Avenue, Montreal, QC H3G 1A4, Canada
| | - Vidal Essebag
- Division of Cardiology, McGill University Health Centre, D13.173, 1650 Cedar Avenue, Montreal, QC H3G 1A4, Canada
| | - Petr Neuzil
- Department of Cardiology, Na Homolce Hospital, Prague, Czech Republic
| | - Katia Dyrda
- Department of Medicine, Montreal Heart Institute, Montreal, QC, Canada
| | - Jippe Balt
- Department of Cardiology, St. Antonius Hospital, Nieuwegein, The Netherlands
| | - Borislav Dinov
- Department of Electrophysiology, Leipzig Heart Center, Leipzig, Germany
| | - Angeliki Darma
- Department of Electrophysiology, Leipzig Heart Center, Leipzig, Germany
| | - Arash Arya
- Department for Internal Medicine, University Hospital Halle, Halle, Germany
| | - Frederic Sacher
- Bordeaux University Hospital, IHU LIRYC, University of Bordeaux, Bordeaux, France
| | - Vivek Y Reddy
- Department of Cardiology, Na Homolce Hospital, Prague, Czech Republic
- Helmsley Electrophysiology Center, Mount Sinai Fuster Heart Hospital, New York, NY, USA
| | - Lucas Boersma
- Department of Cardiology, St. Antonius Hospital, Nieuwegein, The Netherlands
- Department of Heart Failure and Arrhythmias,Amsterdam University Medical Center, Amsterdam, The Netherlands
| | | | - Tom De Potter
- Cardiovascular Center, OLV Hospital, Moorselbaan 164, 9300 Aalst, Belgium
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8
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Roukoz H, Tholakanahalli V. Epicardial ablation of ventricular tachycardia in ischemic cardiomyopathy: A review and local experience. Indian Pacing Electrophysiol J 2024; 24:84-93. [PMID: 38340957 PMCID: PMC11010455 DOI: 10.1016/j.ipej.2024.02.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2023] [Revised: 10/29/2023] [Accepted: 02/07/2024] [Indexed: 02/12/2024] Open
Abstract
Myocardial scar in ischemic cardiomyopathy is predominantly endocardial, however, between 5% and 15% of these patients have an arrhythmogenic epicardial substrate. Percutaneous epicardial ablation should be considered in patients with ICM and VT especially if they failed an endocardial ablation. Simultaneous epicardial and endocardial ablation of VT in ICM may reduce short- and medium-term VT recurrence compared with an endocardial only approach. Cardiac imaging could be used to help guide patient selection for a combined epi-endo approach. Complications related to epicardial access can happen in up to 7% of patients. Epicardial ablation in these patients should be referred to experienced tertiary centers. We review the literature and share interesting cases.
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Rademaker R, Kimura Y, de Riva Silva M, Beukers HC, Piers SRD, Wijnmaalen AP, Dekkers OM, Zeppenfeld K. Area-weighted unipolar voltage to predict heart failure outcomes in patients with ischaemic cardiomyopathy and ventricular tachycardia. Europace 2024; 26:euad346. [PMID: 38308809 PMCID: PMC10838146 DOI: 10.1093/europace/euad346] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2023] [Accepted: 11/15/2023] [Indexed: 02/05/2024] Open
Abstract
AIMS Patients with ischaemic cardiomyopathy (ICM) referred for catheter ablation of ventricular tachycardia (VT) are at risk for end-stage heart failure (HF) due to adverse remodelling. Local unipolar voltages (UV) decrease with loss of viable myocardium. A UV parameter reflecting global viable myocardium may predict prognosis. We evaluate if a newly proposed parameter, area-weighted unipolar voltage (awUV), can predict HF-related outcomes [HFO; HF death/left ventricular (LV) assist device/heart transplant] in ICM. METHODS AND RESULTS From endocardial voltage maps of consecutive patients with ICM referred for VT ablation, awUV was calculated by weighted interpolation of local UV. Associations between clinical and mapping parameters and HFO were evaluated and validated in a second cohort. The derivation cohort consisted of 90 patients [age 68 ±8 years; LV ejection fraction (LVEF) 35% interquartile range (IQR) (24-40)] and validation cohort of 60 patients [age 67 ± 9, LVEF 39% IQR (29-45)]. In the derivation cohort, during a median follow-up of 45 months [IQR (34-83)], 36 (43%) patients died and 23 (26%) had HFO. Patients with HFO had lower awUV [4.51 IQR (3.69-5.31) vs. 7.03 IQR (6.08-9.2), P < 0.001]. A reduction in awUV [optimal awUV (5.58) cut-off determined by receiver operating characteristics analysis] was a strong predictor of HFO (3-year HFO survival 97% vs. 57%). The cut-off value was confirmed in the validation cohort (2-year HFO-free survival 96% vs. 60%). CONCLUSION The newly proposed parameter awUV, easily available from routine voltage mapping, may be useful at identifying ICM patients at high risk for HFO.
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Affiliation(s)
- Robert Rademaker
- Department of Cardiology (C-05-P), Leiden University Medical Center, P.O. Box 9600, Albinusdreef 2, 2333 ZA, Leiden, The Netherlands
- Willem Einthoven Center of Arrhythmia Research and Management, Leiden, The Netherlands
| | - Yoshi Kimura
- Department of Cardiology (C-05-P), Leiden University Medical Center, P.O. Box 9600, Albinusdreef 2, 2333 ZA, Leiden, The Netherlands
- Willem Einthoven Center of Arrhythmia Research and Management, Leiden, The Netherlands
| | - Marta de Riva Silva
- Department of Cardiology (C-05-P), Leiden University Medical Center, P.O. Box 9600, Albinusdreef 2, 2333 ZA, Leiden, The Netherlands
- Willem Einthoven Center of Arrhythmia Research and Management, Leiden, The Netherlands
| | - Hans C Beukers
- Department of Cardiology (C-05-P), Leiden University Medical Center, P.O. Box 9600, Albinusdreef 2, 2333 ZA, Leiden, The Netherlands
| | - Sebastiaan R D Piers
- Department of Cardiology (C-05-P), Leiden University Medical Center, P.O. Box 9600, Albinusdreef 2, 2333 ZA, Leiden, The Netherlands
- Willem Einthoven Center of Arrhythmia Research and Management, Leiden, The Netherlands
| | - Adrianus P Wijnmaalen
- Department of Cardiology (C-05-P), Leiden University Medical Center, P.O. Box 9600, Albinusdreef 2, 2333 ZA, Leiden, The Netherlands
- Willem Einthoven Center of Arrhythmia Research and Management, Leiden, The Netherlands
| | - Olaf M Dekkers
- Department of Clinical Epidemiology, Leiden University Medical Center, Leiden, The Netherlands
| | - Katja Zeppenfeld
- Department of Cardiology (C-05-P), Leiden University Medical Center, P.O. Box 9600, Albinusdreef 2, 2333 ZA, Leiden, The Netherlands
- Willem Einthoven Center of Arrhythmia Research and Management, Leiden, The Netherlands
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10
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Raad M, Supple GE. Epicardial Ventricular Tachycardia Ablation: Patient Selection, Access, and Ablation Techniques and Strategies to Manage Complications. JACC Clin Electrophysiol 2024; 10:142-164. [PMID: 37921791 DOI: 10.1016/j.jacep.2023.09.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2023] [Revised: 08/21/2023] [Accepted: 09/08/2023] [Indexed: 11/04/2023]
Abstract
Epicardial ventricular tachycardia ablation is an important treatment modality for refractory ventricular tachycardia. This comprehensive review guides clinicians through optimized strategies for improved procedural outcomes and patient safety during epicardial ventricular tachycardia ablation. Patient selection criteria, including cardiomyopathy type, electrocardiogram findings, and prior ablation history, are discussed. Detailed techniques for safe pericardial access are provided. Potential complications and strategies for prevention and management are explored. The review also addresses challenges and pitfalls of epicardial mapping and ablation.
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Affiliation(s)
- Mohamad Raad
- Electrophysiology Section, Division of Cardiovascular Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Gregory E Supple
- Electrophysiology Section, Division of Cardiovascular Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania, USA.
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11
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Raja DC, Samarawickrema I, Menon SK, Singh R, Mehta A, Tuan LQ, Pandurangi U, Jain S, Callans DJ, Marchlinski FE, Abhayaratna WP, Sanders P, Pathak RK. Characteristics of the phenotype of mixed cardiomyopathy in patients with implantable cardioverter-defibrillators. J Interv Card Electrophysiol 2024; 67:129-137. [PMID: 37273034 PMCID: PMC10770238 DOI: 10.1007/s10840-023-01577-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/15/2023] [Accepted: 05/22/2023] [Indexed: 06/06/2023]
Abstract
BACKGROUND OR PURPOSE The prognosis of m ixed cardiomyopathy (CMP) in patients with implanted cardioverter-defibrillators (ICDs) has not been investigated. We aim to study the demographic, clinical, device therapies and survival characteristics of mixed CMP in a cohort of patients implanted with a defibrillator. METHODS The term mixed CMP was used to categorise patients with impaired left ventricular ejection fraction attributed to documented non-ischemic triggers with concomitant moderate coronary artery disease. This is a single center observational cohort of 526 patients with a mean follow-up of 8.7 ± 3.5 years. RESULTS There were 42.5% patients with ischemic cardiomyopathy (ICM), 26.9% with non-ischemic cardiomyopathy (NICM) and 30.6% with mixed CMP. Mixed CMP, compared to NICM, was associated with higher mean age (69.1 ± 9.6 years), atrial fibrillation (55.3%) and greater incidence of comorbidities. The proportion of patients with mixed CMP receiving device shocks was 23.6%, compared to 18.4% in NICM and 27% in ICM. The VT cycle length recorded in mixed CMP (281.6 ± 43.1 ms) was comparable with ICM (282.5 ± 44 ms; p = 0.9) and lesser than NICM (297.7 ± 48.7 ms; p = 0.1). All-cause mortality in mixed CMP (21.1%) was similar to ICM (20.1%; p = 0.8) and higher than NICM (15.6%; p = 0.2). The Kaplan-Meier curves revealed hazards of 1.57 (95% CI: 0.91, 2.68) for mixed CMP compared to NICM. CONCLUSION In a cohort of patients with ICD, the group with mixed CMP represents a phenotype predominantly comprised of the elderly with a higher incidence of comorbidities. Mixed CMP resembles ICM in terms of number of device shocks and VT cycle length. Trends of long-term prognosis of patients with mixed CMP are worse than NICM and similar to ICM.
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Affiliation(s)
- Deep Chandh Raja
- ANU School of Medicine and Psychology, Australian National University, 54 Mills Road, Australian Capital Territory, Acton, 2601, Australia
- Canberra Heart Rhythm, Suite 14, 2 Garran Place, Australian Capital Territory, Garran, 2605, Australia
- Cardiac Electrophysiology Unit, Department of Cardiology, Canberra Health Services, Yamba Drive, Australian Capital Territory, Garran, Australia
| | - Indira Samarawickrema
- Canberra Heart Rhythm, Suite 14, 2 Garran Place, Australian Capital Territory, Garran, 2605, Australia
- University of Canberra, Canberra, Australian Capital Territory, Australia
| | - Sarat Krishna Menon
- Canberra Heart Rhythm, Suite 14, 2 Garran Place, Australian Capital Territory, Garran, 2605, Australia
- University of Newcastle, Newcastle, NSW, Australia
| | - Rikvin Singh
- ANU School of Medicine and Psychology, Australian National University, 54 Mills Road, Australian Capital Territory, Acton, 2601, Australia
- Cardiac Electrophysiology Unit, Department of Cardiology, Canberra Health Services, Yamba Drive, Australian Capital Territory, Garran, Australia
| | - Abhinav Mehta
- ANU School of Medicine and Psychology, Australian National University, 54 Mills Road, Australian Capital Territory, Acton, 2601, Australia
- Canberra Heart Rhythm, Suite 14, 2 Garran Place, Australian Capital Territory, Garran, 2605, Australia
| | - Lukah Q Tuan
- Canberra Heart Rhythm, Suite 14, 2 Garran Place, Australian Capital Territory, Garran, 2605, Australia
| | | | - Sanjiv Jain
- Cardiac Electrophysiology Unit, Department of Cardiology, Canberra Health Services, Yamba Drive, Australian Capital Territory, Garran, Australia
| | - David J Callans
- Electrophysiology Section, Hospital of the University of Pennsylvania, Philadelphia, PA, USA
| | - Francis E Marchlinski
- Electrophysiology Section, Hospital of the University of Pennsylvania, Philadelphia, PA, USA
| | - Walter P Abhayaratna
- ANU School of Medicine and Psychology, Australian National University, 54 Mills Road, Australian Capital Territory, Acton, 2601, Australia
- Canberra Heart Rhythm, Suite 14, 2 Garran Place, Australian Capital Territory, Garran, 2605, Australia
| | - Prashanthan Sanders
- Centre for Heart Rhythm Disorders, University of Adelaide and Royal Adelaide Hospital, Adelaide, Australia
| | - Rajeev K Pathak
- ANU School of Medicine and Psychology, Australian National University, 54 Mills Road, Australian Capital Territory, Acton, 2601, Australia.
- Canberra Heart Rhythm, Suite 14, 2 Garran Place, Australian Capital Territory, Garran, 2605, Australia.
- Cardiac Electrophysiology Unit, Department of Cardiology, Canberra Health Services, Yamba Drive, Australian Capital Territory, Garran, Australia.
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Englert F, Bahlke F, Erhard N, Krafft H, Popa MA, Risse E, Lennerz C, Lengauer S, Telishevska M, Reents T, Kottmaier M, Kolb C, Hessling G, Deisenhofer I, Bourier F. VT ablation based on CT imaging substrate visualization: results from a large cohort of ischemic and non-ischemic cardiomyopathy patients. Clin Res Cardiol 2023:10.1007/s00392-023-02321-1. [PMID: 38112744 DOI: 10.1007/s00392-023-02321-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/07/2023] [Accepted: 10/09/2023] [Indexed: 12/21/2023]
Abstract
INTRODUCTION The eradication of ventricular tachycardia (VT) isthmus sites constitutes the minimal procedural endpoint for VT ablation procedures. Contemporary high-resolution computed tomography (CT) imaging, in combination with computer-assisted analysis and segmentation of CT data, facilitates targeted elimination of VT isthmi. In this context, inHEART offers digitally rendered three-dimensional (3D) cardiac models which allow preoperative planning for VT ablations in ischemic and non-ischemic cardiomyopathies. To date, almost no data have been collected to compare the outcomes of VT ablations utilizing inHEART with those of traditional ablation approaches. METHODS The presented data are derived from a retrospective analysis of n = 108 patients, with one cohort undergoing VT ablation aided by late-enhancement CT and subsequent analysis and segmentation by inHEART, while the other cohort received ablation through conventional methods like substrate mapping and activation mapping. The ablations were executed utilizing a 3D mapping system (Carto3), with the mapping generated via the CARTO® PENTARAY™ NAV catheter and subsequently merged with the inHEART model, if available. RESULTS Results showed more successful outcome of ablations for the inHEART group with lower VT recurrence (27% vs. 42%, p < 0.06). Subsequent analyses revealed that patients with ischemic cardiomyopathies appeared to derive a significant benefit from inHEART-assisted VT ablation procedures, with a higher rate of successful ablation (p = 0.05). CONCLUSION Our findings indicate that inHEART-guided ablation is associated with reduced VT recurrence compared to conventional procedures. This suggests that employing advanced imaging and computational modeling in VT ablation may be valuable for VT recurrences.
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Affiliation(s)
- F Englert
- Department of Electrophysiology, German Heart Center Munich, Technical University of Munich (TUM), Lazarettstr. 36, 80636, Munich, Germany
| | - F Bahlke
- Department of Electrophysiology, German Heart Center Munich, Technical University of Munich (TUM), Lazarettstr. 36, 80636, Munich, Germany
| | - N Erhard
- Department of Electrophysiology, German Heart Center Munich, Technical University of Munich (TUM), Lazarettstr. 36, 80636, Munich, Germany
| | - H Krafft
- Department of Electrophysiology, German Heart Center Munich, Technical University of Munich (TUM), Lazarettstr. 36, 80636, Munich, Germany
| | - M-A Popa
- Department of Electrophysiology, German Heart Center Munich, Technical University of Munich (TUM), Lazarettstr. 36, 80636, Munich, Germany
| | - E Risse
- Department of Electrophysiology, German Heart Center Munich, Technical University of Munich (TUM), Lazarettstr. 36, 80636, Munich, Germany
| | - C Lennerz
- Department of Electrophysiology, German Heart Center Munich, Technical University of Munich (TUM), Lazarettstr. 36, 80636, Munich, Germany
| | - S Lengauer
- Department of Electrophysiology, German Heart Center Munich, Technical University of Munich (TUM), Lazarettstr. 36, 80636, Munich, Germany
| | - M Telishevska
- Department of Electrophysiology, German Heart Center Munich, Technical University of Munich (TUM), Lazarettstr. 36, 80636, Munich, Germany
| | - T Reents
- Department of Electrophysiology, German Heart Center Munich, Technical University of Munich (TUM), Lazarettstr. 36, 80636, Munich, Germany
| | - M Kottmaier
- Department of Electrophysiology, German Heart Center Munich, Technical University of Munich (TUM), Lazarettstr. 36, 80636, Munich, Germany
| | - C Kolb
- Department of Electrophysiology, German Heart Center Munich, Technical University of Munich (TUM), Lazarettstr. 36, 80636, Munich, Germany
| | - G Hessling
- Department of Electrophysiology, German Heart Center Munich, Technical University of Munich (TUM), Lazarettstr. 36, 80636, Munich, Germany
| | - I Deisenhofer
- Department of Electrophysiology, German Heart Center Munich, Technical University of Munich (TUM), Lazarettstr. 36, 80636, Munich, Germany
| | - F Bourier
- Department of Electrophysiology, German Heart Center Munich, Technical University of Munich (TUM), Lazarettstr. 36, 80636, Munich, Germany.
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Zeppenfeld K, Kimura Y, Ebert M. Mapping and Ablation of Ventricular Tachycardia in Inherited Left Ventricular Cardiomyopathies. JACC Clin Electrophysiol 2023:S2405-500X(23)00816-2. [PMID: 38127011 DOI: 10.1016/j.jacep.2023.10.023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2023] [Revised: 10/12/2023] [Accepted: 10/23/2023] [Indexed: 12/23/2023]
Abstract
Advances in the field of human genetics have led to an accumulating understanding of the genetic basis of distinct nonischemic cardiomyopathies associated with ventricular tachycardias (VTs) and sudden cardiac death. To date, there is an increasing proportion of patients with inherited cardiomyopathies requiring catheter ablation for VTs. This review provides an overview of disease-causing gene mutations frequently encountered and relevant for clinical electrophysiologists. Available data on VT ablation in patients with an inherited etiology and a phenotype of a nondilated left ventricular cardiomyopathy, dilated cardiomyopathy, or hypertrophic cardiomyopathy are summarized. VTs amenable to catheter ablation are related to nonischemic fibrosis. Recent insights into genotype-phenotype relations of subtype and location of fibrosis have important implications for treatment planning. Current strategies to delineate nonischemic fibrosis and related arrhythmogenic substrates using multimodal imaging, image integration, and electroanatomical mapping are provided. The ablation approach depends on substrate location and extension. Related procedural aspects including patient-tailored (enhanced) ablation strategies and outcomes are outlined. Challenging substrates for VT and the underlying inherited etiologies with a high risk for rapid progressive heart failure contribute to poor outcomes after catheter ablation. Electroanatomical data obtained during ablation may allow the identification of patients at particular risk who need to be considered for early work-up for left ventricular assist device implantation or heart transplantation.
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Affiliation(s)
- Katja Zeppenfeld
- Department of Cardiology, Heart-Lung-Center, Leiden University Medical Center, Leiden, the Netherlands; Willem Einthoven Center of Arrhythmia Research and Management, Leiden, the Netherlands, and Aarhus, Denmark.
| | - Yoshitaka Kimura
- Department of Cardiology, Heart-Lung-Center, Leiden University Medical Center, Leiden, the Netherlands; Willem Einthoven Center of Arrhythmia Research and Management, Leiden, the Netherlands, and Aarhus, Denmark
| | - Micaela Ebert
- Department of Cardiology, Heart-Lung-Center, Leiden University Medical Center, Leiden, the Netherlands; Division of Electrophysiology, Department of Internal Medicine and Cardiology, Heart Center Dresden, Technische Universität Dresden, Dresden, Germany
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14
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Raja DC, Samarawickrema I, Srinivasan JR, Menon S, Das SK, Jain S, Tuan LQ, Desjardins B, Marchlinski FE, Abhayaratna WP, Sanders P, Pathak RK. Correlation of myocardial strain by CMR-feature tracking with substrate abnormalities detected by electro-anatomical mapping in patients with nonischemic cardiomyopathy. J Interv Card Electrophysiol 2023; 66:2113-2123. [PMID: 37129791 PMCID: PMC10694091 DOI: 10.1007/s10840-023-01553-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/20/2023] [Accepted: 04/14/2023] [Indexed: 05/03/2023]
Abstract
BACKGROUND Late gadolinium enhancement (LGE) detected by cardiac MRI (CMR) has low correlation with low voltage zones (LVZs) detected by electroanatomical mapping (EAM). We aim to study correlation of myocardial strain by CMR- Feature Tracking (FT) alongside LGE with LVZs detected by EAM. METHODS Nineteen consecutive CMRs of patients with EAM were analyzed offline by CMR-FT. Peak value of circumferential strain (CS), longitudinal strain (LS), and LGE was measured in each segment of the left ventricle (17-segment model). The percentage of myocardial segments with CS and LS > -17% was determined. Percentage area of LGE-scar was calculated. Global and segment-wise bipolar and unipolar voltage was collected. Percentage area of bipolar LVZ (<1.5 mV) and unipolar LVZ (<8.3 mV) was calculated. RESULTS Mean age was 62±11 years. Mean LVEF was 37±13%. Mean global CS was -11.8±5%. Mean global LS was -11.2±4%. LGE-scar was noted in 74% of the patients. Mean percentage area of LGE-scar was 5%. There was significant correlation between percentage abnormality detected by LS with percentage bipolar LVZ (r = +0.5, p = 0.03) and combined percentage CS+LS abnormality with percentage unipolar LVZ (r = +0.5, p = 0.02). Per-unit increase in CS increased the percentage area of unipolar LVZ by 2.09 (p = 0.07) and per-unit increase in LS increased the percentage area of unipolar LVZ by 2.49 (p = 0.06). The concordance rates between CS and LS to localize segments with bipolar/unipolar LVZ were 79% and 95% compared to 63% with LGE. CONCLUSIONS Myocardial strain detected by CMR-FT has a better correlation with electrical low voltage zones than the conventional LGE.
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Affiliation(s)
- Deep Chandh Raja
- ANU School of Medicine and Psychology, Australian National University, 54 Mills Road, Acton, 2601, ACT, Australia
- Canberra Health Services, 2 Garran place, Garran, Canberra, 2605, Australia
- Canberra Heart Rhythm, 2 Garran Place, Garran, 2605, Australia
| | | | | | - SaratKrishna Menon
- University of Newcastle, Newcastle, NSW, Australia
- Canberra Heart Rhythm, 2 Garran Place, Garran, 2605, Australia
| | - Souvik Kumar Das
- Canberra Health Services, 2 Garran place, Garran, Canberra, 2605, Australia
| | - Sanjiv Jain
- Canberra Health Services, 2 Garran place, Garran, Canberra, 2605, Australia
| | - Lukah Q Tuan
- ANU School of Medicine and Psychology, Australian National University, 54 Mills Road, Acton, 2601, ACT, Australia
- Canberra Heart Rhythm, 2 Garran Place, Garran, 2605, Australia
| | - Benoit Desjardins
- Electrophysiology Section, Hospital of the University of Pennsylvania, Philadelphia, USA
| | - Francis E Marchlinski
- Electrophysiology Section, Hospital of the University of Pennsylvania, Philadelphia, USA
| | - Walter P Abhayaratna
- ANU School of Medicine and Psychology, Australian National University, 54 Mills Road, Acton, 2601, ACT, Australia
- Canberra Health Services, 2 Garran place, Garran, Canberra, 2605, Australia
| | - Prashanthan Sanders
- Center for Heart Rhythm Disorders, University of Adelaide and Royal Adelaide Hospital, Adelaide, Australia
| | - Rajeev K Pathak
- ANU School of Medicine and Psychology, Australian National University, 54 Mills Road, Acton, 2601, ACT, Australia.
- Canberra Health Services, 2 Garran place, Garran, Canberra, 2605, Australia.
- Canberra Heart Rhythm, 2 Garran Place, Garran, 2605, Australia.
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15
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Saguner AM, Lunk D, Mohsen M, Knecht S, Akdis D, Costa S, Gasperetti A, Duru F, Rossi VA, Brunckhorst CB. Electroanatomical voltage mapping with contact force sensing for diagnosis of arrhythmogenic right ventricular cardiomyopathy. Int J Cardiol 2023; 392:131289. [PMID: 37619879 DOI: 10.1016/j.ijcard.2023.131289] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/21/2023] [Revised: 08/17/2023] [Accepted: 08/20/2023] [Indexed: 08/26/2023]
Abstract
BACKGROUND Three-dimensional electroanatomical mapping (EAM) can be helpful to diagnose arrhythmogenic right ventricular cardiomyopathy (ARVC). Yet, previous studies utilizing EAM have not systematically used contact-force sensing catheters (CFSC) to characterize the substrate in ARVC, which is the current gold standard to assure adequate tissue contact. OBJECTIVE To investigate reference values for endocardial right ventricular (RV) EAM as well as substrate characterization in patients with ARVC by using CFSC. METHODS Endocardial RV EAM during sinus rhythm was performed with CFSC in 12 patients with definite ARVC and 5 matched controls without structural heart disease. A subanalysis for the RV outflow tract (RVOT), septum, free-wall, subtricuspid region, and apex was performed. Endocardial bipolar and unipolar voltage amplitudes (BVA, UVA), signal characteristics and duration as well as the impact of catheter orientation on endocardial signals were also investigated. RESULTS ARVC patients showed lower BVA vs. controls (p = 0.018), particularly in the subtricuspid region (1.4, IQR:0.5-3.1 vs. 3.8, IQR:2.5-5 mV, p = 0.037) and RV apex (2.5, IQR:1.5-4 vs. 4.3,IQR:2.9-6.1 mV, p = 0.019). BVA in all RV regions yielded a high sensitivity and specificity for ARVC diagnosis (AUC 59-78%, p < 0.05 for all), with the highest performance for the subtricuspid region (AUC 78%, 95% CI:0.75-0.81, p < 0.001, negative predictive value 100%). A positive correlation between BVA and an orthogonal catheter orientation (46°-90°:r = 0.106, p < 0.001), and a negative correlation between BVA and EGM duration (r = -0.370, p < 0.001) was found. CONCLUSIONS EAM using CFSC validates previous bipolar cut-off values for normal endocardial RV voltage amplitudes. RV voltages are generally lower in ARVC as compared to controls, with the subtricuspid area being commonly affected and having the highest discriminatory power to differentiate between ARVC and healthy controls. Therefore, EAM using CFSC constitutes a promising tool for diagnosis of ARVC.
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Affiliation(s)
- A M Saguner
- Arrhythmia Division, Department of Cardiology, University Heart Center Zurich, University Hospital Zurich, Zurich, Switzerland; Center for Translational and Experimental Cardiology (CTEC), Department of Cardiology, Zurich University Hospital, University of Zurich, 8952 Schlieren, Switzerland.
| | - D Lunk
- Arrhythmia Division, Department of Cardiology, University Heart Center Zurich, University Hospital Zurich, Zurich, Switzerland
| | - M Mohsen
- Arrhythmia Division, Department of Cardiology, University Heart Center Zurich, University Hospital Zurich, Zurich, Switzerland; Department of Cardiology, Qatar Heart Hospital 7GR5+RW4, Doha, Qatar
| | - Sven Knecht
- Cardiology, University Hospital Basel, University of Basel, Basel, Switzerland
| | - Deniz Akdis
- Arrhythmia Division, Department of Cardiology, University Heart Center Zurich, University Hospital Zurich, Zurich, Switzerland
| | - S Costa
- Arrhythmia Division, Department of Cardiology, University Heart Center Zurich, University Hospital Zurich, Zurich, Switzerland
| | - A Gasperetti
- Arrhythmia Division, Department of Cardiology, University Heart Center Zurich, University Hospital Zurich, Zurich, Switzerland; Division of Cardiology, Department of Medicine, Johns Hopkins Hospital, Carnegie 568D, 600 N. Wolfe St., Baltimore, MD 21287, USA
| | - F Duru
- Arrhythmia Division, Department of Cardiology, University Heart Center Zurich, University Hospital Zurich, Zurich, Switzerland; Center for Translational and Experimental Cardiology (CTEC), Department of Cardiology, Zurich University Hospital, University of Zurich, 8952 Schlieren, Switzerland
| | - V A Rossi
- Arrhythmia Division, Department of Cardiology, University Heart Center Zurich, University Hospital Zurich, Zurich, Switzerland
| | - C B Brunckhorst
- Arrhythmia Division, Department of Cardiology, University Heart Center Zurich, University Hospital Zurich, Zurich, Switzerland
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Rodero C, Baptiste TMG, Barrows RK, Lewalle A, Niederer SA, Strocchi M. Advancing clinical translation of cardiac biomechanics models: a comprehensive review, applications and future pathways. FRONTIERS IN PHYSICS 2023; 11:1306210. [PMID: 38500690 PMCID: PMC7615748 DOI: 10.3389/fphy.2023.1306210] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Indexed: 03/20/2024]
Abstract
Cardiac mechanics models are developed to represent a high level of detail, including refined anatomies, accurate cell mechanics models, and platforms to link microscale physiology to whole-organ function. However, cardiac biomechanics models still have limited clinical translation. In this review, we provide a picture of cardiac mechanics models, focusing on their clinical translation. We review the main experimental and clinical data used in cardiac models, as well as the steps followed in the literature to generate anatomical meshes ready for simulations. We describe the main models in active and passive mechanics and the different lumped parameter models to represent the circulatory system. Lastly, we provide a summary of the state-of-the-art in terms of ventricular, atrial, and four-chamber cardiac biomechanics models. We discuss the steps that may facilitate clinical translation of the biomechanics models we describe. A well-established software to simulate cardiac biomechanics is lacking, with all available platforms involving different levels of documentation, learning curves, accessibility, and cost. Furthermore, there is no regulatory framework that clearly outlines the verification and validation requirements a model has to satisfy in order to be reliably used in applications. Finally, better integration with increasingly rich clinical and/or experimental datasets as well as machine learning techniques to reduce computational costs might increase model reliability at feasible resources. Cardiac biomechanics models provide excellent opportunities to be integrated into clinical workflows, but more refinement and careful validation against clinical data are needed to improve their credibility. In addition, in each context of use, model complexity must be balanced with the associated high computational cost of running these models.
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Affiliation(s)
- Cristobal Rodero
- Cardiac Electro-Mechanics Research Group (CEMRG), National Heart and Lung Institute, Faculty of Medicine, Imperial College London, London, United Kingdom
| | - Tiffany M. G. Baptiste
- Cardiac Electro-Mechanics Research Group (CEMRG), National Heart and Lung Institute, Faculty of Medicine, Imperial College London, London, United Kingdom
- Department of Biomedical Engineering, School of Biomedical Engineering and Imaging Sciences, Faculty of Life Sciences and Medicine, King’s College London, London, United Kingdom
| | - Rosie K. Barrows
- Cardiac Electro-Mechanics Research Group (CEMRG), National Heart and Lung Institute, Faculty of Medicine, Imperial College London, London, United Kingdom
- Department of Biomedical Engineering, School of Biomedical Engineering and Imaging Sciences, Faculty of Life Sciences and Medicine, King’s College London, London, United Kingdom
| | - Alexandre Lewalle
- Cardiac Electro-Mechanics Research Group (CEMRG), National Heart and Lung Institute, Faculty of Medicine, Imperial College London, London, United Kingdom
| | - Steven A. Niederer
- Cardiac Electro-Mechanics Research Group (CEMRG), National Heart and Lung Institute, Faculty of Medicine, Imperial College London, London, United Kingdom
- Turing Research and Innovation Cluster in Digital Twins (TRIC: DT), The Alan Turing Institute, London, United Kingdom
| | - Marina Strocchi
- Cardiac Electro-Mechanics Research Group (CEMRG), National Heart and Lung Institute, Faculty of Medicine, Imperial College London, London, United Kingdom
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Subramanian M, Atreya AR, Saggu DK, Yalagudri S, Calambur N. Catheter ablation of ventricular tachycardia: strategies to improve outcomes. Front Cardiovasc Med 2023; 10:966634. [PMID: 37645526 PMCID: PMC10461400 DOI: 10.3389/fcvm.2023.966634] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2022] [Accepted: 04/24/2023] [Indexed: 08/31/2023] Open
Abstract
Catheter ablation of ventricular arrhythmias has evolved considerably since it was first described more than 3 decades ago. Advancements in understanding the underlying substrate, utilizing pre-procedural imaging, and evolving ablation techniques have improved the outcomes of catheter ablation. Ensuring safety and efficacy during catheter ablation requires adequate planning, including analysis of the 12 lead ECG and appropriate pre-procedural imaging. Defining the underlying arrhythmogenic substrate and disease eitology allow for the developed of tailored ablation strategies, especially for patients with non-ischemic cardiomyopathies. During ablation, the type of anesthesia can affect VT induction, the quality of the electro-anatomic map, and the stability of the catheter during ablation. For high risk patients, appropriate selection of hemodynamic support can increase the success of VT ablation. For patients in whom VT is hemodynamically unstable or difficult to induce, substrate modification strategies can aid in safe and successful ablation. Recently, there has been an several advancements in substrate mapping strategies that can be used to identify and differentiate local late potentials. The incorporation of high-definition mapping and contact-sense technologies have both had incremental benefits on the success of ablation procedures. It is crucial to harness newer technology and ablation strategies with the highest level of peri-procedural safety to achieve optimal long-term outcomes in patients undergoing VT ablation.
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Affiliation(s)
- Muthiah Subramanian
- Department of Cardiology, AIG Institute of Cardiac Sciences, Gachibowli, India
| | - Auras R. Atreya
- Department of Cardiology, University of Arkansas Medical Sciences, Little Rock, AR, United States
| | - Daljeet Kaur Saggu
- Department of Cardiology, AIG Institute of Cardiac Sciences, Gachibowli, India
| | - Sachin Yalagudri
- Department of Cardiology, AIG Institute of Cardiac Sciences, Gachibowli, India
| | - Narasimhan Calambur
- Department of Cardiology, AIG Institute of Cardiac Sciences, Gachibowli, India
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Kamioka M, Makimoto H, Watanabe T, Watanabe H, Okuyama T, Kaneshiro T, Hijioka N, Yokota A, Komori T, Kabutoya T, Imai Y, Kario K. Unipolar-voltage-based evaluation of left atrial tissue properties and ablation outcome in patients with atrial fibrillation. Europace 2023; 25:euad240. [PMID: 37539865 PMCID: PMC10422692 DOI: 10.1093/europace/euad240] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2023] [Revised: 04/12/2023] [Accepted: 08/01/2023] [Indexed: 08/05/2023] Open
Abstract
AIMS The relationship between local unipolar voltage (UV) in the pulmonary vein (PV)-ostia and left atrial wall thickness (LAWT) and the utility of these parameters as indices of outcome after atrial fibrillation (AF) ablation remain unclear. METHODS AND RESULTS Two-hundred seventy-two AF patients who underwent AF ablation were enrolled. Unipolar voltage of PV-ostia was measured using a CARTO system, and LAWT was measured using computed tomography. The primary endpoint was atrial tachyarrhythmia (ATA) recurrence including AF. The ATA recurrence was documented in 74 patients (ATA-Rec group). The UV and LAWT of the bilateral superior PV roof to posterior and around the right-inferior PV in the ATA-Rec group were significantly greater than in patients without ATA recurrence (ATA-Free group) (P < 0.001). The UV had a strong positive correlation with LAWT (R2 = 0.446, P < 0.001). The UV 2.7 mV and the corresponding LAWT 1.6 mm were determined as the cut-off values for ATA recurrence (P < 0.001, respectively). Multisite LA high UV (HUV, ≥4 areas of >2.7 mV) or multisite LA wall thickening (≥5 areas of >1.6 mm), defined as LA hypertrophy (LAH), was related to higher ATA recurrence. Among 92 LAH patients, 66 had HUV (LAH-HUV) and the remaining 26 had low UV (LAH-LUV), characterized by history of non-paroxysmal AF and heart failure, reduced LV ejection fraction, or enlarged LA. In addition, LAH-LUV showed the worst ablation outcome, followed by LAH-HUV and No LAH (log-rank P < 0.001). CONCLUSION Combining UV and LAWT enables us to stratify recurrence risk and suggest a tailored ablation strategy according to LA tissue properties.
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Affiliation(s)
- Masashi Kamioka
- Division of Cardiovascular Medicine, Department of Medicine, Jichi Medical University School of Medicine, 3311-1 Yakushiji, Shimotsuke 329-0498, Japan
| | - Hisaki Makimoto
- Division of Cardiovascular Medicine, Department of Medicine, Jichi Medical University School of Medicine, 3311-1 Yakushiji, Shimotsuke 329-0498, Japan
| | - Tomonori Watanabe
- Division of Cardiovascular Medicine, Department of Medicine, Jichi Medical University School of Medicine, 3311-1 Yakushiji, Shimotsuke 329-0498, Japan
| | - Hiroaki Watanabe
- Division of Cardiovascular Medicine, Department of Medicine, Jichi Medical University School of Medicine, 3311-1 Yakushiji, Shimotsuke 329-0498, Japan
| | - Takafumi Okuyama
- Division of Cardiovascular Medicine, Department of Medicine, Jichi Medical University School of Medicine, 3311-1 Yakushiji, Shimotsuke 329-0498, Japan
| | - Takashi Kaneshiro
- Department of Arrhythmia and Cardiac Pacing, Fukushima Medical University, 1 Hikarigaoka, Fukushima 960-1295, Japan
| | - Naoko Hijioka
- Cardiovascular Center, Ohta Nishinouchi Hospital, 2-5-20 Nishinouchi, Koriyama 963-8558, Japan
| | - Ayako Yokota
- Division of Cardiovascular Medicine, Department of Medicine, Jichi Medical University School of Medicine, 3311-1 Yakushiji, Shimotsuke 329-0498, Japan
| | - Takahiro Komori
- Division of Cardiovascular Medicine, Department of Medicine, Jichi Medical University School of Medicine, 3311-1 Yakushiji, Shimotsuke 329-0498, Japan
| | - Tomoyuki Kabutoya
- Division of Cardiovascular Medicine, Department of Medicine, Jichi Medical University School of Medicine, 3311-1 Yakushiji, Shimotsuke 329-0498, Japan
| | - Yasushi Imai
- Division of Cardiovascular Medicine, Department of Medicine, Jichi Medical University School of Medicine, 3311-1 Yakushiji, Shimotsuke 329-0498, Japan
| | - Kazuomi Kario
- Division of Cardiovascular Medicine, Department of Medicine, Jichi Medical University School of Medicine, 3311-1 Yakushiji, Shimotsuke 329-0498, Japan
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Kujiraoka H, Hojo R, Arai T, Takahashi M, Fukamizu S. Association between residual unipolar voltage and arrhythmia recurrence after left atrial posterior wall isolation for persistent atrial fibrillation. J Cardiovasc Electrophysiol 2023; 34:1622-1629. [PMID: 37393602 DOI: 10.1111/jce.15990] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/24/2023] [Revised: 06/01/2023] [Accepted: 06/21/2023] [Indexed: 07/04/2023]
Abstract
INTRODUCTION Posterior wall isolation (PWI) combined with pulmonary vein isolation (PVI) has proven effective for persistent atrial fibrillation (AF). However, when performing PWI, creating transmural lesions with subendocardial ablation is sometimes difficult. Endocardial unipolar voltage amplitude had a higher sensitivity than bipolar voltage mapping for identifying intramural viable myocardium in the atria. In this study, we aimed to retrospectively investigate the correlation between the residual potential in the posterior wall (PW) following PWI for persistent AF and atrial arrhythmia recurrence using endocardial unipolar voltage. METHODS This was a single-center observational study. Patients who underwent PVI and PWI for persistent AF in the first procedure between March 2018 and December 2021 at the Tokyo Metropolitan Hiroo Hospital were included in this study. The patients were divided into two groups based on the presence of residual unipolar PW potentials after PWI with a cutoff of 1.08 mV and the recurrence of atrial arrhythmias was compared. RESULTS In total, 109 patients were included in the analysis. Forty-three patients had residual unipolar potentials after PWI and 66 patients had no residual unipolar potentials. The atrial arrhythmia recurrence rate was significantly higher in the group with residual unipolar potential (41.8% vs. 17.9%, p = 0.003). The residual unipolar potential was an independent predictor of recurrence (odds ratio: 4.53; confidence interval: 1.67-12.3, p = 0.003). CONCLUSION Residual unipolar potential after PWI for persistent AF is associated with recurrent atrial arrhythmias.
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Affiliation(s)
- Hirofumi Kujiraoka
- Department of Cardiology, Tokyo Metropolitan Hiroo Hospital, Tokyo, Japan
| | - Rintaro Hojo
- Department of Cardiology, Tokyo Metropolitan Hiroo Hospital, Tokyo, Japan
| | - Tomoyuki Arai
- Department of Cardiology, Tokyo Metropolitan Hiroo Hospital, Tokyo, Japan
| | - Masao Takahashi
- Department of Cardiology, Tokyo Metropolitan Hiroo Hospital, Tokyo, Japan
| | - Seiji Fukamizu
- Department of Cardiology, Tokyo Metropolitan Hiroo Hospital, Tokyo, Japan
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20
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Chakrabarti AK, Deshmukh A, Liang JJ, Madamanchi C, Ghannam M, Morady F, Bogun F. Mitral Annular Substrate and Ventricular Arrhythmias in Arrhythmogenic Mitral Valve Prolapse With Mitral Annular Disjunction. JACC Clin Electrophysiol 2023; 9:1265-1275. [PMID: 37086231 DOI: 10.1016/j.jacep.2023.02.010] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2022] [Revised: 01/18/2023] [Accepted: 02/08/2023] [Indexed: 04/23/2023]
Abstract
BACKGROUND In patients with bileaflet mitral valve prolapse (MVP), mitral annular disjunction (MAD) is associated with increased risk of sudden cardiac death via incompletely understood mechanisms. OBJECTIVES This study assessed the substrate for ventricular arrhythmias in patients with bileaflet MVP and MAD as well as outcomes of catheter ablation with an emphasis on sustained, monomorphic ventricular tachycardia (VT). METHODS A total of 18 consecutive patients (11 women, mean age 54 ± 15 years) with bileaflet MVP and MAD underwent catheter ablation for VT, and/or premature ventricular complexes (PVCs). Eight patients had a prior cardiac arrest. RESULTS PVCs were targeted for ablation in all 18 patients (symptomatic PVCs n = 15, PVC-induced ventricular fibrillation n = 3). Sustained monomorphic VT was targeted in 7 of 18 patients. Electroanatomic mapping showed low voltage in the area of the mitral annulus corresponding to VT target sites in 6 of 7 patients with sustained VT. Four of 7 patients had low voltage in the areas of MAD. Six of 7 patients with VT were rendered noninducible post-ablation. The PVC burden was reduced from 11.0% ± 10.4% to 4.0% ± 5.5% (P = 0.004). Over a mean follow-up of 33.9 ± 43.4 months, no VTs recurred. There were no major complications. No repeat ablations for VT occurred. Five of 18 patients required repeat ablation for PVCs. CONCLUSIONS In patients with bileaflet MVP and MAD undergoing catheter ablation, the mitral valve annulus often contains low-voltage areas harboring the substrate for monomorphic VT and PVCs. Ablation in these patients was safe and improved arrhythmia control.
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Affiliation(s)
- Apurba K Chakrabarti
- Section of Electrophysiology, Division of Cardiovascular Medicine, Department of Internal Medicine, University of Michigan, Ann Arbor, Michigan, USA
| | - Amrish Deshmukh
- Section of Electrophysiology, Division of Cardiovascular Medicine, Department of Internal Medicine, University of Michigan, Ann Arbor, Michigan, USA
| | - Jackson J Liang
- Section of Electrophysiology, Division of Cardiovascular Medicine, Department of Internal Medicine, University of Michigan, Ann Arbor, Michigan, USA
| | - Chaitanya Madamanchi
- Section of Electrophysiology, Division of Cardiovascular Medicine, Department of Internal Medicine, University of Michigan, Ann Arbor, Michigan, USA
| | - Michael Ghannam
- Section of Electrophysiology, Division of Cardiovascular Medicine, Department of Internal Medicine, University of Michigan, Ann Arbor, Michigan, USA
| | - Fred Morady
- Section of Electrophysiology, Division of Cardiovascular Medicine, Department of Internal Medicine, University of Michigan, Ann Arbor, Michigan, USA
| | - Frank Bogun
- Section of Electrophysiology, Division of Cardiovascular Medicine, Department of Internal Medicine, University of Michigan, Ann Arbor, Michigan, USA.
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21
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Zghaib T, Nazarian S. Volume-Weighted Unipolar Voltage: A Novel Prognostic Marker in Dilated Cardiomyopathy and Ventricular Arrhythmia. JACC Clin Electrophysiol 2023; 9:976-978. [PMID: 37438046 DOI: 10.1016/j.jacep.2023.01.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2022] [Accepted: 01/04/2023] [Indexed: 07/14/2023]
Affiliation(s)
- Tarek Zghaib
- Division of Cardiovascular Medicine, Section for Cardiac Electrophysiology, Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Saman Nazarian
- Division of Cardiovascular Medicine, Section for Cardiac Electrophysiology, Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania, USA.
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22
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Lazzeroni D, Crocamo A, Ziveri V, Notarangelo MF, Rizzello D, Spoladori M, Donelli D, Cacciola G, Ardissino D, Niccoli G, Peretto G. Personalized Management of Sudden Death Risk in Primary Cardiomyopathies: From Clinical Evaluation and Multimodality Imaging to Ablation and Cardioverter-Defibrillator Implant. J Pers Med 2023; 13:jpm13050877. [PMID: 37241047 DOI: 10.3390/jpm13050877] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2023] [Revised: 05/08/2023] [Accepted: 05/17/2023] [Indexed: 05/28/2023] Open
Abstract
Sudden cardiac death represents the leading cause of death worldwide; although the majority of sudden deaths occur in an elderly population with coronary artery disease, some occur in young and otherwise healthy individuals, as is the case of cardiomyopathies. The aim of the present review is to provide a stepwise hierarchical approach for the global sudden death risk estimation in primary cardiomyopathies. Each individual risk factor is analyzed for its contribution to the overall risk of sudden death for each specific cardiomyopathy as well as across all primary myocardial diseases. This stepwise hierarchical and personalized approach starts from the clinical evaluation, subsequently passes through the role of electrocardiographic monitoring and multimodality imaging, and finally concludes with genetic evaluation and electro-anatomical mapping. In fact, the sudden cardiac death risk assessment in cardiomyopathies depends on a multiparametric approach. Moreover, current indications for ventricular arrhythmia ablation and defibrillator implantation are discussed.
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Affiliation(s)
- Davide Lazzeroni
- Prevention and Rehabilitation Unit of Parma, IRCCS Fondazione Don Gnocchi, 43100 Parma, Italy
| | - Antonio Crocamo
- U.O.C. di Cardiologia, Azienda Ospedaliero-Universitaria di Parma, 43100 Parma, Italy
| | - Valentina Ziveri
- Prevention and Rehabilitation Unit of Parma, IRCCS Fondazione Don Gnocchi, 43100 Parma, Italy
| | | | - Davide Rizzello
- U.O.C. di Cardiologia, Azienda Ospedaliero-Universitaria di Parma, 43100 Parma, Italy
| | - Matteo Spoladori
- U.O.C. di Cardiologia, Azienda Ospedaliero-Universitaria di Parma, 43100 Parma, Italy
| | - Davide Donelli
- U.O.C. di Cardiologia, Azienda Ospedaliero-Universitaria di Parma, 43100 Parma, Italy
| | - Giovanna Cacciola
- Prevention and Rehabilitation Unit of Parma, IRCCS Fondazione Don Gnocchi, 43100 Parma, Italy
| | - Diego Ardissino
- U.O.C. di Cardiologia, Azienda Ospedaliero-Universitaria di Parma, 43100 Parma, Italy
| | - Giampaolo Niccoli
- U.O.C. di Cardiologia, Azienda Ospedaliero-Universitaria di Parma, 43100 Parma, Italy
| | - Giovanni Peretto
- Department of Cardiac Electrophysiology and Arrhythmology, IRCCS San Raffaele Scientific Institute, 20132 Milan, Italy
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23
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Bennett RG, Garikapati K, Campbell TG, Kotake Y, Turnbull S, Bhaskaran A, De Silva K, Kanawati J, Zhou J, Wong MS, Kumar S. Mortality after catheter ablation of structural heart disease related ventricular tachycardia. Int J Cardiol 2023:S0167-5273(23)00728-3. [PMID: 37225093 DOI: 10.1016/j.ijcard.2023.05.035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/28/2023] [Revised: 05/02/2023] [Accepted: 05/19/2023] [Indexed: 05/26/2023]
Abstract
BACKGROUND There is a paucity of data describing mortality after catheter ablation of ventricular tachycardia (VT). OBJECTIVES We describe the causes and predictors of cardiac transplant and/or mortality following catheter ablation of structural heart disease (SHD) related VT. METHODS Over 10-years, 175 SHD patients underwent VT ablation. Clinical characteristics, and outcomes, were compared between patients undergoing transplant and/or dying and those surviving. RESULTS During 2.8 (IQR 1.9-5.0) years follow-up, 37/175 (21%) patients underwent transplant and/or died following VT ablation. Prior to ablation, these patients were older (70.3 ± 11.1 vs. 62.1 ± 13.9 years, P = 0.001), had lower left ventricular ejection fraction ([LVEF] 30 ± 12% vs. 44 ± 14%, P < 0.001), and were more likely to have failed amiodarone (57% vs. 39%, P = 0.050), compared to those that survived. Predictors of transplant and/or mortality included LVEF≤35% (HR 4.71 [95% CI 2.18-10.18], P < 0.001), age ≥ 65 years (HR 2.18 [95% CI 1.01-4.73], P = 0.047), renal impairment (HR 3.73 [95% CI 1.80-7.74], P < 0.001), amiodarone failure (HR 2.67 [95% CI 1.27-5.63], P = 0.010) and malignancy (HR 3.09 [95% CI 1.03-9.26], P = 0.043). Ventricular arrhythmia free survival at 6-months was lower in the transplant and/or deceased, compared to non-deceased group (62% vs. 78%, P = 0.010), but was not independently associated with transplant and/or mortality. The risk score, MORTALITIES-VA, accurately predicted transplant and/or mortality (AUC: 0.872 [95% CI 0.810-0.934]). CONCLUSIONS Cardiac transplant and/or mortality after VT ablation occurred in 21% of patients. Independent predictors included LVEF≤35%, age ≥ 65 years, renal impairment, malignancy, and amiodarone failure. The MORTALITIES-VA score may identify patients at high-risk of transplant and/or dying after VT ablation.
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Affiliation(s)
- Richard G Bennett
- Department of Cardiology, Westmead Hospital, Westmead Applied Research Centre, University of Sydney, Australia
| | - Kartheek Garikapati
- Department of Cardiology, Westmead Hospital, Westmead Applied Research Centre, University of Sydney, Australia
| | - Timothy G Campbell
- Department of Cardiology, Westmead Hospital, Westmead Applied Research Centre, University of Sydney, Australia
| | - Yasuhito Kotake
- Department of Cardiology, Westmead Hospital, Westmead Applied Research Centre, University of Sydney, Australia
| | - Samual Turnbull
- Department of Cardiology, Westmead Hospital, Westmead Applied Research Centre, University of Sydney, Australia
| | - Ashwin Bhaskaran
- Department of Cardiology, Westmead Hospital, Westmead Applied Research Centre, University of Sydney, Australia
| | - Kasun De Silva
- Department of Cardiology, Westmead Hospital, Westmead Applied Research Centre, University of Sydney, Australia
| | - Juliana Kanawati
- Department of Cardiology, Westmead Hospital, Westmead Applied Research Centre, University of Sydney, Australia
| | - Julia Zhou
- Department of Cardiology, Westmead Hospital, Westmead Applied Research Centre, University of Sydney, Australia
| | - Mary S Wong
- Department of Cardiology, Westmead Hospital, Westmead Applied Research Centre, University of Sydney, Australia
| | - Saurabh Kumar
- Department of Cardiology, Westmead Hospital, Westmead Applied Research Centre, University of Sydney, Australia.
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Dello Russo A, Compagnucci P, Zorzi A, Cavarretta E, Castelletti S, Contursi M, D'Aleo A, D'Ascenzi F, Mos L, Palmieri V, Patrizi G, Pelliccia A, Sarto P, Delise P, Zeppilli P, Romano S, Palamà Z, Sciarra L. Electroanatomic mapping in athletes: Why and when. An expert opinion paper from the Italian society of sports cardiology. Int J Cardiol 2023:S0167-5273(23)00702-7. [PMID: 37178805 DOI: 10.1016/j.ijcard.2023.05.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/18/2023] [Revised: 04/21/2023] [Accepted: 05/10/2023] [Indexed: 05/15/2023]
Abstract
Three-dimensional electroanatomical mapping (EAM) has the potential to identify the pathological substrate underlying ventricular arrhythmias (VAs) in different clinical settings by detecting myocardial areas with abnormally low voltages, which reflect the presence of different cardiomyopathic substrates. In athletes, the added value of EAM may be to enhance the efficacy of third-level diagnostic tests and cardiac magnetic resonance (CMR) in detecting concealed arrhythmogenic cardiomyopathies. Additional benefits of EAM in the athlete include the potential impact on disease risk stratification and the consequent implications for eligibility to competitive sports. This opinion paper of the Italian Society of Sports Cardiology aims to guide general sports medicine physicians and cardiologists on the clinical decision when to eventually perform an EAM study in the athlete, highlighting strengths and weaknesses for each cardiovascular disease at risk of sudden cardiac death during sport. The importance of early (preclinical) diagnosis to prevent the negative effects of exercise on phenotypic expression, disease progression, and worsening of the arrhythmogenic substrate is also addressed.
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Affiliation(s)
- Antonio Dello Russo
- Cardiology and Arrhythmology Clinic, University Hospital "Lancisi-Umberto I- Salesi", Ancona, Italy, Department of Biomedical Sciences and Public Health, Marche Polytechnic University, Ancona, Italy
| | - Paolo Compagnucci
- Cardiology and Arrhythmology Clinic, University Hospital "Lancisi-Umberto I- Salesi", Ancona, Italy, Department of Biomedical Sciences and Public Health, Marche Polytechnic University, Ancona, Italy
| | - Alessandro Zorzi
- Department of Cardiac, Thoracic and Vascular Sciences and Public Health, University of Padova, Padova, Italy
| | - Elena Cavarretta
- Department of Medical-Surgical Sciences and Biotechnologies, Sapienza University of Rome, Latina, Italy; Mediterranea Cardiocentro, Naples, Italy
| | - Silvia Castelletti
- Department of Cardiology, Istituto Auxologico Italiano IRCCS, Milan, Italy
| | - Maurizio Contursi
- Division of Cardiology, Hospital of Peschiera del Garda, Veneto, Italy
| | | | - Flavio D'Ascenzi
- Division of Cardiology, Department of Medical Biotechnologies, University of Siena, Siena, Italy
| | - Lucio Mos
- San Antonio Hospital, San Daniele del Friuli, Udine, Italy
| | - Vincenzo Palmieri
- Sports Medicine Unit, Fondazione Policlinico Universitario Agostino Gemelli IRCCS, Rome, Italy
| | | | | | | | | | - Paolo Zeppilli
- Sports Medicine Unit, Fondazione Policlinico Universitario Agostino Gemelli IRCCS, Rome, Italy
| | - Silvio Romano
- Department of Life, Health and Environmental Sciences, University of L'Aquila, Aquila, Italy
| | - Zefferino Palamà
- Department of Life, Health and Environmental Sciences, University of L'Aquila, Aquila, Italy; Casa di Cura Villa Verde, Taranto, Italy.
| | - Luigi Sciarra
- Department of Life, Health and Environmental Sciences, University of L'Aquila, Aquila, Italy
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25
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Arceluz MR, Thind M, Garcia FC, Guandalini GS, Santangeli P, Hyman M, Deo R, Frankel DS, Supple GE, Schaller RD, Callans DJ, Nazarian S, Dixit S, Kumareswaran R, Zado ES, Marchlinski FE. Sinus Rhythm Electrocardiographic Abnormalities, Sites of Origin, and Ablation Outcomes of Ventricular Premature Depolarizations Initiating Ventricular Fibrillation. Heart Rhythm 2023; 20:844-852. [PMID: 36958413 DOI: 10.1016/j.hrthm.2023.03.019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/26/2022] [Revised: 03/13/2023] [Accepted: 03/15/2023] [Indexed: 03/25/2023]
Abstract
BACKGROUND Ventricular fibrillation (VF) can be initiated by ventricular premature depolarizations (VPDs) in the absence of obvious structural abnormalities. OBJECTIVE To determine the prevalence of 12-lead ECG sinus rhythm reduced QRS amplitude, QRS fractionation (QRSf) and early repolarization (ER) pattern, and the outcome of catheter ablation and VPD anatomic distribution in patients with VPDs initiating VF. METHODS We compared a cohort with no apparent structural heart disease and VPDs initiating VF (Group 1, n=42) to a reference cohort (Group 2, n=61) of patients with no structural heart disease and symptomatic unifocal VPDs. RESULTS A reduced QRS amplitude (<.55 mV) in aVF (59 % vs 10%, p<0.001), QRSf in ≥2 contiguous leads (50% vs 16%, p<0.001) and early repolarization pattern (21.4% vs 1.6%, p=0.01) were more common in Group 1 vs Group 2. At least one abnormal ECG finding was present in 34 (81%) Group 1 vs 17 (28%) Group 2 patients, (p<0.001). VPD origin included RV and LV distal Purkinje system and moderator band/ papillary muscles, in 83% Group 1 vs 18% Group 2 patients, p<0.001. VF was eliminated with single ablation procedure in 77% of Group 1 patients with at least 2 years of follow-up. CONCLUSIONS A reduced QRS amplitude (<.55 mV) in aVF, QRS fractionation in ≥2 contiguous leads and/or an early repolarization pattern are frequently observed in patients with VPDs initiating VF. VPDs initiating VF typically originate from the distal Purkinje system and papillary muscles and can be successfully eliminated with catheter ablation.
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Affiliation(s)
- Martín R Arceluz
- Section of Cardiac Electrophysiology, Division of Cardiovascular Medicine, Department of Medicine, Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Munveer Thind
- Section of Cardiac Electrophysiology, Division of Cardiovascular Medicine, Department of Medicine, Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Fermin C Garcia
- Section of Cardiac Electrophysiology, Division of Cardiovascular Medicine, Department of Medicine, Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Gustavo S Guandalini
- Section of Cardiac Electrophysiology, Division of Cardiovascular Medicine, Department of Medicine, Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Pasquale Santangeli
- Section of Cardiac Electrophysiology, Division of Cardiovascular Medicine, Department of Medicine, Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Matthew Hyman
- Section of Cardiac Electrophysiology, Division of Cardiovascular Medicine, Department of Medicine, Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Rajat Deo
- Section of Cardiac Electrophysiology, Division of Cardiovascular Medicine, Department of Medicine, Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - David S Frankel
- Section of Cardiac Electrophysiology, Division of Cardiovascular Medicine, Department of Medicine, Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Gregory E Supple
- Section of Cardiac Electrophysiology, Division of Cardiovascular Medicine, Department of Medicine, Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Robert D Schaller
- Section of Cardiac Electrophysiology, Division of Cardiovascular Medicine, Department of Medicine, Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - David J Callans
- Section of Cardiac Electrophysiology, Division of Cardiovascular Medicine, Department of Medicine, Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Saman Nazarian
- Section of Cardiac Electrophysiology, Division of Cardiovascular Medicine, Department of Medicine, Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Sanjay Dixit
- Section of Cardiac Electrophysiology, Division of Cardiovascular Medicine, Department of Medicine, Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Ramanan Kumareswaran
- Section of Cardiac Electrophysiology, Division of Cardiovascular Medicine, Department of Medicine, Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Erica S Zado
- Section of Cardiac Electrophysiology, Division of Cardiovascular Medicine, Department of Medicine, Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Francis E Marchlinski
- Section of Cardiac Electrophysiology, Division of Cardiovascular Medicine, Department of Medicine, Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania, USA.
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26
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Hayase J, Bradfield J. T1 Mapping: A Complementary Tool for Substrate Visualization. JACC Clin Electrophysiol 2023:S2405-500X(23)00119-6. [PMID: 37115115 DOI: 10.1016/j.jacep.2023.01.038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2023] [Accepted: 01/22/2023] [Indexed: 04/29/2023]
Affiliation(s)
- Justin Hayase
- UCLA Cardiac Arrhythmia Center, David Geffen School of Medicine at UCLA, Los Angeles, California, USA.
| | - Jason Bradfield
- UCLA Cardiac Arrhythmia Center, David Geffen School of Medicine at UCLA, Los Angeles, California, USA
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27
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Mueller J, Chakarov I, Halbfass P, Nentwich K, Ene E, Berkovitz A, Sonne K, Barth S, Waechter C, Behnes M, Akin I, Fodor S, Lehmkuhl L, Deneke T. Adverse Prognosis of Patients with Septal Substrate After VT Ablation Due to Electrical Storm. JACC Clin Electrophysiol 2023:S2405-500X(23)00067-1. [PMID: 36951814 DOI: 10.1016/j.jacep.2023.01.012] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2022] [Revised: 12/20/2022] [Accepted: 01/18/2023] [Indexed: 03/24/2023]
Abstract
BACKGROUND Data about ventricular tachycardia (VT) ablation in patients with electrical storm (ES) is limited. OBJECTIVES This study sought to compare the prognostic outcome of patients undergoing VT ablation after ES with and without a septal substrate. METHODS In this large single-center study, consecutive patients presenting with ES and undergoing VT ablation from June 2018 to April 2021 were included. Patients with septal substrate were compared with patients without septal substrate regarding endpoints of cardiovascular mortality, VT recurrences, recurrences of the clinical VT, and rehospitalization rates. RESULTS A total of 107 patients undergoing a first VT ablation because of electrical storm (ES) were included (age 65 ± 13 years, 86% male, 45% ischemic cardiomyopathy). Major complications occurred in 11% of all patients with increased postinterventional third-degree atrioventricular blocks among patients with septal substrate (9% vs 0%; P = 0.063). Partial ablation successes were similar (95% with a septal substrate vs 100% without a septal substrate; P = 0.251). Complete ablation success was achieved in 63% with a septal substrate and in 87% without a septal substrate (P = 0.004). After a median 22 months of follow-up, patients with septal substrate died significantly more often from cardiovascular causes (26% vs 7%; log-rank P = 0.018). In univariate analysis cardiovascular mortality for ES patients with septal substrate was 4.1-fold higher (HR: 4.192; CI: 1.194-14.719; P = 0.025). Independent predictors of adverse outcome in multivariable regression analysis were presence of septal substrate (HR: 5.723; P = 0.025) and increased age (HR: 1.104; P = 0.003). Recurrences of any ventricular arrhythmia (67% vs 56%; log rank P = 0.554) and rehospitalization rates (80% vs 66%; log rank P = 0.515) were similar between groups. Recurrences of clinical VT were similar (7% vs 2%; P = 0.252). CONCLUSIONS Presence of a septal substrate is associated with adverse long-term cardiovascular mortality in patients admitted for VT ablation after ES. Despite decreased acute ablation successes in these patients, VT recurrence rates were similar to those without a septal substrate during follow-up.
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Affiliation(s)
- Julian Mueller
- Clinic for Interventional Electrophysiology, Heart Centre Bad Neustadt, Bad Neustadt a. d. Saale, Germany; Department of Cardiology and Angiology, Philipps-University Marburg, Marburg, Germany; First Department of Medicine, University Medical Centre Mannheim, Mannheim, Germany.
| | - Ivaylo Chakarov
- Clinic for Interventional Electrophysiology, Heart Centre Bad Neustadt, Bad Neustadt a. d. Saale, Germany
| | - Philipp Halbfass
- Department of Cardiology and Angiology, Philipps-University Marburg, Marburg, Germany; Department of Cardiology, Klinikum Oldenburg, European Medical School Oldenburg-Groningen, Carl von Ossietzky University, Oldenburg, Germany
| | - Karin Nentwich
- Clinic for Interventional Electrophysiology, Heart Centre Bad Neustadt, Bad Neustadt a. d. Saale, Germany; Department of Cardiology and Angiology, Philipps-University Marburg, Marburg, Germany
| | - Elena Ene
- Clinic for Interventional Electrophysiology, Heart Centre Bad Neustadt, Bad Neustadt a. d. Saale, Germany
| | - Artur Berkovitz
- Clinic for Interventional Electrophysiology, Heart Centre Bad Neustadt, Bad Neustadt a. d. Saale, Germany
| | - Kai Sonne
- Clinic for Interventional Electrophysiology, Heart Centre Bad Neustadt, Bad Neustadt a. d. Saale, Germany
| | - Sebastian Barth
- Clinic for Interventional Electrophysiology, Heart Centre Bad Neustadt, Bad Neustadt a. d. Saale, Germany; Department of Cardiology and Angiology, Philipps-University Marburg, Marburg, Germany
| | - Christian Waechter
- Department of Cardiology and Angiology, Philipps-University Marburg, Marburg, Germany
| | - Michael Behnes
- First Department of Medicine, University Medical Centre Mannheim, Mannheim, Germany
| | - Ibrahim Akin
- First Department of Medicine, University Medical Centre Mannheim, Mannheim, Germany
| | - Stefan Fodor
- Department of Radiology, Heart Center Bad Neustadt, Bad Neustadt a. d. Saale, Germany
| | - Lukas Lehmkuhl
- Department of Radiology, Heart Center Bad Neustadt, Bad Neustadt a. d. Saale, Germany
| | - Thomas Deneke
- Clinic for Interventional Electrophysiology, Heart Centre Bad Neustadt, Bad Neustadt a. d. Saale, Germany
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Imnadze G, Sommer P, Fink T, Hamriti ME, Khalaph M, Braun M, Sciacca V, Isgandarova K, Guckel D, Sohns C. First clinical experience using a novel automated mapping algorithm for mapping of ventricular arrhythmias. Heart Vessels 2023; 38:984-991. [PMID: 36786857 DOI: 10.1007/s00380-023-02245-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/07/2022] [Accepted: 01/26/2023] [Indexed: 02/15/2023]
Abstract
A new automated vector-based mapping algorithm (AMA) for 3-dimensional (3D) mapping has been introduced. The aim of this study was to present our experience using AMA to recognize additional catheter ablation targets in patients with ventricular arrhythmias (VA). A total of 16 patients (ICM; ischemic cardiomyopathy, n = 6; NICM; non-ischemic cardiomyopathy n = 10) suffering from VA underwent catheter ablation. Following bipolar voltage mapping, AMA was utilized to reveal zones of decelerated conduction velocity vectors (CVV) and this information was superimposed onto the 3D reconstructions and compared with the presence of scar. Mapping time was 28.1 ± 10 min for the endocardial reconstruction of the left ventricle (LV) and 17 ± 5.4 min for the epicardium (n = 6 patients). The mean area of LV low voltage was 13.9 ± 15% (endocardial) and 11.9 ± 5.7% (epicardial). Decelerating CVV zones were revealed in all patients (mean conduction velocity threshold of 39.3 ± 13%). Sustained VA have been terminated through ablation and substrate modification was performed in all patients. Correlation between the presence of CVV deceleration zones and areas of abnormal low voltage from bipolar mapping was revealed in only 37.5% of patients, but there was good correlation between scar from unipolar voltage mapping and the presence of CCV deceleration zones (94%; p = 0.008). The novel AMA may improve the understanding of individual VA substrates due to the visualization of decelerated CVV zones and their correlation with abnormal low voltage predominantly from unipolar mapping.
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Affiliation(s)
- Guram Imnadze
- Clinic for Electrophysiology, Herz- und Diabeteszentrum NRW, Ruhr-Universität Bochum, Bad Oeynhausen, Germany.
| | - Philipp Sommer
- Clinic for Electrophysiology, Herz- und Diabeteszentrum NRW, Ruhr-Universität Bochum, Bad Oeynhausen, Germany
| | - Thomas Fink
- Clinic for Electrophysiology, Herz- und Diabeteszentrum NRW, Ruhr-Universität Bochum, Bad Oeynhausen, Germany
| | - Mustapha El Hamriti
- Clinic for Electrophysiology, Herz- und Diabeteszentrum NRW, Ruhr-Universität Bochum, Bad Oeynhausen, Germany
| | - Moneeb Khalaph
- Clinic for Electrophysiology, Herz- und Diabeteszentrum NRW, Ruhr-Universität Bochum, Bad Oeynhausen, Germany
| | - Martin Braun
- Clinic for Electrophysiology, Herz- und Diabeteszentrum NRW, Ruhr-Universität Bochum, Bad Oeynhausen, Germany
| | - Vanessa Sciacca
- Clinic for Electrophysiology, Herz- und Diabeteszentrum NRW, Ruhr-Universität Bochum, Bad Oeynhausen, Germany
| | - Khuraman Isgandarova
- Clinic for Electrophysiology, Herz- und Diabeteszentrum NRW, Ruhr-Universität Bochum, Bad Oeynhausen, Germany
| | - Denise Guckel
- Clinic for Electrophysiology, Herz- und Diabeteszentrum NRW, Ruhr-Universität Bochum, Bad Oeynhausen, Germany
| | - Christian Sohns
- Clinic for Electrophysiology, Herz- und Diabeteszentrum NRW, Ruhr-Universität Bochum, Bad Oeynhausen, Germany
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29
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Bennett RG, Campbell T, Garikapati K, Kotake Y, Turnbull S, Kanawati J, Wong MS, Qian P, Thomas SP, Chow CK, Kovoor P, Robert Denniss A, Chik W, Marschner S, Kistler P, Haqqani H, Rowe M, Voskoboinik A, Lee G, Jackson N, Sanders P, Roberts-Thomson K, Chan KH, Sy R, Pathak R, Kanagaratnam L, Chia K, El-Sokkari I, Hallani H, Kanthan A, Burgess D, Kumar S. A Prospective, Multicentre Randomised Controlled Trial Comparing Catheter Ablation Versus Antiarrhythmic Drugs in Patients With Structural Heart Disease Related Ventricular Tachycardia: The CAAD-VT Trial Protocol. Heart Lung Circ 2023; 32:184-196. [PMID: 36599791 DOI: 10.1016/j.hlc.2022.09.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2022] [Revised: 07/20/2022] [Accepted: 09/08/2022] [Indexed: 01/03/2023]
Abstract
IMPORTANCE Randomised trials have shown that catheter ablation (CA) is superior to medical therapy for ventricular tachycardia (VT) largely in patients with ischaemic heart disease. Whether this translates to patients with all forms and stages of structural heart disease (SHD-e.g., non-ischaemic heart disease) is unclear. This trial will help clarify whether catheter ablation offers superior outcomes compared to medical therapy for VT in all patients with SHD. OBJECTIVE To determine in patients with SHD and spontaneous or inducible VT, if catheter ablation is more efficacious than medical therapy in control of VT during follow-up. DESIGN Randomised controlled trial including 162 patients, with an allocation ratio of 1:1, stratified by left ventricular ejection fraction (LVEF) and geographical region of site, with a median follow-up of 18-months and a minimum follow-up of 1 year. SETTING Multicentre study performed in centres across Australia. PARTICIPANTS Structural heart disease patients with sustained VT or inducible VT (n=162). INTERVENTION Early treatment, within 30 days of randomisation, with catheter ablation (intervention) or initial treatment with antiarrhythmic drugs only (control). MAIN OUTCOMES, MEASURES, AND RESULTS Primary endpoint will be a composite of recurrent VT, VT storm (≥3 VT episodes in 24 hrs or incessant VT), or death. Secondary outcomes will include each of the individual primary endpoints, VT burden (number of VT episodes in the 6 months preceding intervention compared to the 6 months after intervention), cardiovascular hospitalisation, mortality (including all-cause mortality, cardiac death, and non-cardiac death) and LVEF (assessed by transthoracic echocardiography from baseline to 6-, 12-, 24- and 36-months post intervention). CONCLUSIONS AND RELEVANCE The Catheter Ablation versus Anti-arrhythmic Drugs for Ventricular Tachycardia (CAAD-VT) trial will help determine whether catheter ablation is superior to antiarrhythmic drug therapy alone, in patients with SHD-related VT. TRIAL REGISTRY Australian New Zealand Clinical Trials Registry (ANZCTR) TRIAL REGISTRATION ID: ACTRN12620000045910 TRIAL REGISTRATION URL: https://www.anzctr.org.au/Trial/Registration/TrialReview.aspx?id=377617&isReview=true.
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Affiliation(s)
| | - Richard G Bennett
- Department of Cardiology, Westmead Hospital, Westmead Applied Research Centre, University of Sydney, Sydney, NSW, Australia
| | - Timothy Campbell
- Department of Cardiology, Westmead Hospital, Westmead Applied Research Centre, University of Sydney, Sydney, NSW, Australia
| | - Kartheek Garikapati
- Department of Cardiology, Westmead Hospital, Westmead Applied Research Centre, University of Sydney, Sydney, NSW, Australia
| | - Yasuhito Kotake
- Department of Cardiology, Westmead Hospital, Westmead Applied Research Centre, University of Sydney, Sydney, NSW, Australia
| | - Samual Turnbull
- Department of Cardiology, Westmead Hospital, Westmead Applied Research Centre, University of Sydney, Sydney, NSW, Australia
| | - Juliana Kanawati
- Department of Cardiology, Westmead Hospital, Westmead Applied Research Centre, University of Sydney, Sydney, NSW, Australia
| | - Mary S Wong
- Department of Cardiology, Westmead Hospital, Westmead Applied Research Centre, University of Sydney, Sydney, NSW, Australia
| | - Pierre Qian
- Department of Cardiology, Westmead Hospital, Department of Cardiology, Blacktown Hospital, Sydney, NSW, Australia
| | - Stuart P Thomas
- Department of Cardiology, Westmead Hospital, Sydney, NSW, Australia
| | - Clara K Chow
- Department of Cardiology, Westmead Hospital, Westmead Applied Research Centre, University of Sydney, Sydney, NSW, Australia
| | - Pramesh Kovoor
- Department of Cardiology, Westmead Hospital, Sydney, NSW, Australia
| | - A Robert Denniss
- Department of Cardiology, Westmead Hospital, Department of Cardiology, Blacktown Hospital, Sydney, NSW, Australia
| | - William Chik
- Department of Cardiology, Westmead Hospital, Sydney, NSW, Australia
| | - Simone Marschner
- Westmead Applied Research Centre, University of Sydney, Sydney, NSW, Australia
| | - Peter Kistler
- Department of Cardiology, The Alfred Hospital, Sydney, NSW, Australia
| | - Haris Haqqani
- Department of Cardiology, The Prince Charles Hospital, Brisbane, Qld, Australia
| | - Matthew Rowe
- Department of Cardiology, Gold Coast University Hospital, Brisbane, Qld, Australia
| | | | - Geoffrey Lee
- Department of Cardiology, The Royal Melbourne Hospital, Melbourne, Vic, Australia
| | - Nicholas Jackson
- Department of Cardiology, John Hunter Hospital, Newcastle, NSW, Australia
| | | | | | - Kim Hoe Chan
- Department of Cardiology, Royal Prince Alfred Hospital, Sydney, NSW, Australia
| | - Raymond Sy
- Department of Cardiology, Royal Prince Alfred Hospital, Sydney, NSW, Australia
| | - Rajeev Pathak
- Department of Cardiology, Canberra Hospital, ACT, Australia
| | - Logan Kanagaratnam
- Department of Cardiology, Royal North Shore Hospital, Sydney, NSW, Australia
| | - Karin Chia
- Department of Cardiology, Royal North Shore Hospital, Sydney, NSW, Australia
| | - Ihab El-Sokkari
- Department of Cardiology, Nepean Hospital, Sydney, NSW, Australia
| | - Hisham Hallani
- Department of Cardiology, Nepean Hospital, Sydney, NSW, Australia
| | - Ajita Kanthan
- Department of Cardiology, Blacktown Hospital, Sydney, NSW, Australia
| | - David Burgess
- Department of Cardiology, Blacktown Hospital, Sydney, NSW, Australia
| | - Saurabh Kumar
- Department of Cardiology, Westmead Hospital, Westmead Applied Research Centre, University of Sydney, Sydney, NSW, Australia.
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30
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Yavin H, Younis A, Zilberman I, Krywanczyk A, Bubar ZP, Higuchi K, Barkagan M, Anter E. Atrial Endocardial Unipolar Voltage Mapping for Detection of Viable Intramural Myocardium: A Proof-of-Concept Study. Circ Arrhythm Electrophysiol 2023; 16:e011321. [PMID: 36595639 DOI: 10.1161/circep.122.011321] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
BACKGROUND Endocardial bipolar voltage amplitude is largely derived from endocardial and subendocardial wall layers. This may result in situations of low bipolar voltage amplitude despite the presence of mid-myocardial including epicardial (ie, intramural-epicardial) viable myocardium. This study examined the utility of endocardial unipolar voltage mapping for detection of viable intramural-epicardial atrial myocardium. METHODS In 15 swine, an atrial intercaval ablation line with an intentional gap was created. Animals survived for 6 to 8 weeks before electroanatomical mapping followed by sacrifice. Gaps were determined by the presence of electrical conduction and classified based on the histopathologiclly layer(s) of viable myocardium into the following: (1) transmural, (2) endocardial, and (3) intramural-epicardial. Voltage data from healthy, scar, and gap points were exported into excel. The sensitivity and specificity of bipolar and unipolar voltage amplitude to detect intramural-epicardial gaps were compared using receiver operating characteristic analysis. RESULTS In 9 of 15 (60%) swine, a focal ablation gap was detected in the intercaval line, while in the remainder 6 of 15 (40%), the line was complete without gaps. Gaps were classified into transmural (n=3), endocardial (n=3), or intramural-epicardial (n=3). Intramural-epicardial gaps were characterized by very low bipolar voltage amplitude that was similar to areas with transmural scar (P=0.91). In comparison, unipolar voltage amplitude in intramural-epicardial gaps was significantly higher compared to transmural scar (P<0.001). Unipolar voltage amplitude had higher sensitivity (93% versus 14%, respectively) and similar specificity (95% versus 98%, respectively) to bipolar voltage for detection of intramural-epicardial gaps. CONCLUSIONS Atrial unipolar voltage mapping may be a useful technique for identifying viable intramural-epicardial myocardium in patients with endocardial scar.
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Affiliation(s)
- Hagai Yavin
- Cardiac Electrophysiology Section, Department of Cardiovascular Medicine (H.Y., A.Y., I.Z., K.H., E.A.), Cleveland Clinic, OH
| | - Arwa Younis
- Cardiac Electrophysiology Section, Department of Cardiovascular Medicine (H.Y., A.Y., I.Z., K.H., E.A.), Cleveland Clinic, OH
| | - Israel Zilberman
- Cardiac Electrophysiology Section, Department of Cardiovascular Medicine (H.Y., A.Y., I.Z., K.H., E.A.), Cleveland Clinic, OH
| | - Alison Krywanczyk
- Department of Pathology and Laboratory Medicine (A.K.), Cleveland Clinic, OH
| | | | - Koji Higuchi
- Cardiac Electrophysiology Section, Department of Cardiovascular Medicine (H.Y., A.Y., I.Z., K.H., E.A.), Cleveland Clinic, OH
| | - Michael Barkagan
- Cardiac Electrophysiology Section, Department of Cardiovascular Medicine, Shamir Medical Center, Be'er Ya'akov, Israel (M.B., E.A.)
| | - Elad Anter
- Cardiac Electrophysiology Section, Department of Cardiovascular Medicine (H.Y., A.Y., I.Z., K.H., E.A.), Cleveland Clinic, OH.,Cardiac Electrophysiology Section, Department of Cardiovascular Medicine, Shamir Medical Center, Be'er Ya'akov, Israel (M.B., E.A.)
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31
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Howell SJ, Moss JD. Adding epicardial ablation for ventricular tachycardia: a 1-2 punch, or simply 3rd time's the charm? J Interv Card Electrophysiol 2023; 66:95-97. [PMID: 35403928 DOI: 10.1007/s10840-022-01216-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/01/2022] [Accepted: 04/05/2022] [Indexed: 10/18/2022]
Affiliation(s)
- Stacey J Howell
- Section of Cardiac Electrophysiology, Division of Cardiology, University of California, San Francisco, CA, USA
| | - Joshua D Moss
- Section of Cardiac Electrophysiology, Division of Cardiology, University of California, San Francisco, CA, USA.
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32
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Impact of sex on clinical, procedural characteristics and outcomes of catheter ablation for ventricular arrhythmias according to underlying heart disease. JOURNAL OF INTERVENTIONAL CARDIAC ELECTROPHYSIOLOGY : AN INTERNATIONAL JOURNAL OF ARRHYTHMIAS AND PACING 2023; 66:203-213. [PMID: 35353320 DOI: 10.1007/s10840-022-01188-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/18/2021] [Accepted: 03/20/2022] [Indexed: 10/18/2022]
Abstract
BACKGROUND Women are under-represented in many key studies and trials examining outcomes of catheter ablation (CA) for ventricular arrhythmias (VA). We compared characteristics between men and women undergoing their first catheter ablation for VA at a single centre over 10 years. METHODS The clinical, procedural characteristics and outcomes of 287 consecutive patients (male = 182, female = 105), undergoing their first CA at our centre over 10 years were compared according to sex and underlying heart disease. RESULTS In the ablation population, women were younger, had fewer co-morbidities, were less likely to have ischemic cardiomyopathy (ICM) and VA storm and were more likely to have idiopathic VA and premature ventricular complexes as the indication for ablation (P < 0.05 for all). Amongst idiopathic and non-ischemic cardiomyopathy (NICM) subgroups, baseline characteristics were similar; amongst ICM, women were younger and had higher numbers of drug failure pre-ablation (P = 0.05). Women were similar to men in all procedural characteristics, acute procedural success and complications, regardless of underlying heart disease. At median follow-up of 666 days, VA-free survival, overall mortality and survival free of death or transplant were comparable in both groups. Sex was not a predictor of these outcomes, after accounting for clinical and procedural characteristics. CONCLUSION Women represented 36% of the real-world population at our centre referred for CA of VA. There are key differences in clinical features of women versus men referred for VA ablation. Despite these differences, VA ablation in women can be accomplished with similar success and complication rates to men, regardless of underlying heart disease.
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33
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Kotake Y, Nalliah CJ, Campbell T, Bennett RG, Turnbull S, Kumar S. Comparison of the arrhythmogenic substrate for ventricular tachycardia in patients with ischemic vs non-ischemic cardiomyopathy - insights from high-density, multi-electrode catheter mapping. JOURNAL OF INTERVENTIONAL CARDIAC ELECTROPHYSIOLOGY : AN INTERNATIONAL JOURNAL OF ARRHYTHMIAS AND PACING 2023; 66:5-14. [PMID: 34787768 DOI: 10.1007/s10840-021-01088-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/02/2021] [Accepted: 11/04/2021] [Indexed: 11/26/2022]
Abstract
PURPOSE The purpose of this study was to compare the differences of arrhythmogenic substrate using high-density mapping in ventricular tachycardia (VT) patients with ischemic (ICM) vs non-ischemic cardiomyopathy (NICM). METHODS Data from patients presenting for VT ablation from December 2016 to December 2020 at Westmead Hospital were reviewed. RESULTS Sixty consecutive patients with structural heart disease (ICM 57%, NICM 43%, mean age 66 years) having catheter ablation of scar-related VT with pre-dominant left ventricular involvement were included. ICM was associated with larger proportion of dense scar area (bipolar; 19 [12-29]% vs 6 [3-10]%, P < 0.001, unipolar; 20 [12-32]% vs 11 [7-19]%, P = 0.01) compared with NICM. However, the scar ratio (unipolar dense scar [%]/bipolar dense scar [%]) was significantly higher in NICM patients (1.2 [0.8-1.7] vs 1.7 [1.3-2.3], P = 0.003). Larger scar area in ICM was paralleled by higher proportion of complex electrograms (6 [2-13] % vs 3 [1-5] %, P = 0.01), longer and wider voltage based conducting channels, higher incidence of late potential-based conducting channels, longer VT cycle-length (399 ± 80 ms vs 359 ± 68 ms, P = 0.04) and greater maximal stimulation-QRS interval among sites with good pace-map correlation (75 [51-99]ms vs 48 [31-73]ms, P = 0.02). Ventricular arrhythmia (VA) storm was more highly prevalent in ICM than NICM (50% vs 23%, P = 0.03). During the follow-up period, NICM had a significantly higher cumulative incidence for the VA recurrence than ICM (P = 0.03). CONCLUSIONS High-density multi-electrode catheter mapping of left ventricular arrhythmogenic substrate of NICM tends to show smaller dense scar area and higher scar ratio, compared with ICM, suggestive the extent of epicardial/intramural substrate, with paucity of substrate targets for ablation, which results in the worse outcomes with ablation.
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Affiliation(s)
- Yasuhito Kotake
- Department of Cardiology, Westmead Hospital, Westmead Applied Research Centre, University of Sydney, Hawkesbury Road, Westmead, NSW, 2145, Australia
| | - Chrishan J Nalliah
- Department of Cardiology, Westmead Hospital, Westmead Applied Research Centre, University of Sydney, Hawkesbury Road, Westmead, NSW, 2145, Australia
| | - Timothy Campbell
- Department of Cardiology, Westmead Hospital, Westmead Applied Research Centre, University of Sydney, Hawkesbury Road, Westmead, NSW, 2145, Australia
| | - Richard G Bennett
- Department of Cardiology, Westmead Hospital, Westmead Applied Research Centre, University of Sydney, Hawkesbury Road, Westmead, NSW, 2145, Australia
| | - Samual Turnbull
- Department of Cardiology, Westmead Hospital, Westmead Applied Research Centre, University of Sydney, Hawkesbury Road, Westmead, NSW, 2145, Australia
| | - Saurabh Kumar
- Department of Cardiology, Westmead Hospital, Westmead Applied Research Centre, University of Sydney, Hawkesbury Road, Westmead, NSW, 2145, Australia.
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34
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Kimura Y, Beukers HKC, Rademaker R, Chen HS, Ebert M, Jensen T, Piers SR, Wijnmaalen AP, de Riva M, Dekkers OM, Stevenson WG, Zeppenfeld K. Volume-Weighted Unipolar Voltage Predicts Heart Failure Mortality in Patients With Dilated Cardiomyopathy and Ventricular Arrhythmias. JACC Clin Electrophysiol 2022:S2405-500X(22)01044-1. [PMID: 36752463 DOI: 10.1016/j.jacep.2022.11.015] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2022] [Revised: 11/08/2022] [Accepted: 11/20/2022] [Indexed: 01/20/2023]
Abstract
BACKGROUND Patients with dilated cardiomyopathy (DCM) who are undergoing catheter ablation of ventricular arrhythmias (VAs) are at risk of rapidly progressive heart failure (HF). Endocardial voltages decrease with loss of viable myocardium. Global left ventricular (LV) voltage as a surrogate for the amount of remaining viable myocardium may predict prognosis. OBJECTIVES This study evaluated whether the newly proposed parameter volume-weighted (vw) unipolar voltage (UV) can predict HF-related adverse outcomes (HFOs), including death, heart transplantation, or ventricular assist device implantation, in DCM. METHODS In consecutive patients with DCM referred for VA ablation, vwUV was calculated by mathematically integrating UV over the left ventricle, divided by the endocardial LV surface area and wall thickness. Patients were followed for HFOs. RESULTS A total of 103 patients (57 ± 14 years of age; LV ejection fraction [LVEF], 39 ± 13%) were included. Median vwUV was 9.75 (IQR: 7.27-12.29). During a median follow-up of 24 months (IQR: 8-47 months), 25 patients (24%) died, and 16 had HFOs 7 months (IQR: 1-18 months) after ablation. Patients with HFOs had significantly lower LVEF (29% ± 10% vs 41% ± 12%), vw bipolar voltage (BV) (3.00 [IQR: 2.47-3.53] vs 5.00 [4.12-5.73]), and vwUV (5.94 [IQR: 5.28-6.55] vs 10.37 [IQR: 8.82-12.81]; all P < 0.001), than patients without HFOs. In Cox regression analysis and goodness-of-fit tests, vwUV was the strongest and independent predictor for HFOs (HR: 3.68; CI: 2.09-6.45; likelihood ratio chi-square, 33.05; P < 0.001). CONCLUSIONS The novel parameter vwUV, as a surrogate for the amount of viable myocardium, identifies patients with DCM with VA who are at high risk for HF progression and mortality.
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Affiliation(s)
- Yoshitaka Kimura
- Department of Cardiology, Heart-Lung Center, Leiden University Medical Center, Leiden, the Netherlands; Willem Einthoven Center of Arrhythmia Research and Management, Leiden University Medical Center, Leiden, the Netherlands
| | - Hans K C Beukers
- Department of Cardiology, Heart-Lung Center, Leiden University Medical Center, Leiden, the Netherlands
| | - Robert Rademaker
- Department of Cardiology, Heart-Lung Center, Leiden University Medical Center, Leiden, the Netherlands; Willem Einthoven Center of Arrhythmia Research and Management, Leiden University Medical Center, Leiden, the Netherlands
| | - H Sophia Chen
- Department of Cardiology, Heart-Lung Center, Leiden University Medical Center, Leiden, the Netherlands; Willem Einthoven Center of Arrhythmia Research and Management, Leiden University Medical Center, Leiden, the Netherlands
| | - Micaela Ebert
- Department of Cardiology, Heart-Lung Center, Leiden University Medical Center, Leiden, the Netherlands; Heart Center Dresden, Department of Cardiology, Technical University Dresden, Dresden, Germany
| | - Thomas Jensen
- Willem Einthoven Center of Arrhythmia Research and Management, Leiden University Medical Center, Leiden, the Netherlands; Department of Cardiology, Aarhus University Hospital, Aarhus, Denmark
| | - Sebastiaan R Piers
- Department of Cardiology, Heart-Lung Center, Leiden University Medical Center, Leiden, the Netherlands; Willem Einthoven Center of Arrhythmia Research and Management, Leiden University Medical Center, Leiden, the Netherlands
| | - Adrianus P Wijnmaalen
- Department of Cardiology, Heart-Lung Center, Leiden University Medical Center, Leiden, the Netherlands; Willem Einthoven Center of Arrhythmia Research and Management, Leiden University Medical Center, Leiden, the Netherlands
| | - Marta de Riva
- Department of Cardiology, Heart-Lung Center, Leiden University Medical Center, Leiden, the Netherlands; Willem Einthoven Center of Arrhythmia Research and Management, Leiden University Medical Center, Leiden, the Netherlands
| | - Olaf M Dekkers
- Department of Clinical Epidemiology, Leiden University Medical Center, Leiden, the Netherlands
| | - William G Stevenson
- Department of Cardiology, Vanderbilt University Medical Center, Nashville, Tennessee, USA
| | - Katja Zeppenfeld
- Department of Cardiology, Heart-Lung Center, Leiden University Medical Center, Leiden, the Netherlands; Willem Einthoven Center of Arrhythmia Research and Management, Leiden University Medical Center, Leiden, the Netherlands.
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Muser D, Santangeli P, Liang JJ. Mechanisms of Ventricular Arrhythmias and Implications for Catheter Ablation. Card Electrophysiol Clin 2022; 14:547-558. [PMID: 36396177 DOI: 10.1016/j.ccep.2022.07.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Ventricular arrhythmias present with a wide spectrum of clinical manifestations, from mildly symptomatic frequent premature ventricular contractions to life-threatening events. Pathophysiologically, idiopathic ventricular arrhythmias occur in the absence of structural heart disease or ion channelopathies. Ventricular arrhythmias in the context of structural heart disease are usually determined by scar-related reentry and are associated with increased mortality. Catheter ablation is safe and highly effective in treating ventricular arrhythmias. The proper characterization of the arrhythmogenic substrate is essential for accurate procedural planning. We provide an overview on the main mechanisms of ventricular arrhythmias and their implications for catheter ablation.
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Affiliation(s)
- Daniele Muser
- Cardiothoracic Department, Udine University Hospital, Udine 33100, Italy; Electrophysiology Section, Division of Cardiology, Hospital of the University of Pennsylvania, 3400 Spruce Street, Philadelphia, PA 19104, USA
| | - Pasquale Santangeli
- Electrophysiology Section, Division of Cardiology, Hospital of the University of Pennsylvania, 3400 Spruce Street, Philadelphia, PA 19104, USA
| | - Jackson J Liang
- Electrophysiology Section, Division of Cardiology, University of Michigan, Frankel Cardiovascular Center, 1425 E. Ann Street, Ann Arbor, MI 48109, USA.
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Maher T, Clarke JR, Virk Z, d'Avila A. Patient Selection, Techniques, and Complication Mitigation for Epicardial Ventricular Tachycardia Ablation. Card Electrophysiol Clin 2022; 14:657-677. [PMID: 36396183 DOI: 10.1016/j.ccep.2022.07.007] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Percutaneous epicardial ventricular tachycardia ablation can decrease implanted cardioverter defibrillator shocks and hospitalizations; proper patient selection and procedural technique are imperative to maximize the benefit-risk ratio. The best candidates for epicardial ventricular tachycardia will depend on history of prior ablation, type of cardiomyopathy, and specific electrocardiogram and cardiac imaging findings. Complications include hemopericardium, hemoperitoneum, coronary vessel injury, and phrenic nerve injury. Modern epicardial mapping techniques provide new understandings of the 3-dimensional nature of reentrant ventricular tachycardia circuits across cardiomyopathy etiologies. Where epicardial access is not feasible, alternative techniques to reach epicardial ventricular tachycardia sources may be necessary.
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Affiliation(s)
- Timothy Maher
- Harvard Thorndike Electrophysiology Institute and Arrhythmia Service, Beth Israel Deaconess Medical Center, 185 Pilgrim Road, Palmer 4, Boston, MA 02215, USA; Harvard Medical School, Boston, MA, USA
| | - John-Ross Clarke
- Harvard Thorndike Electrophysiology Institute and Arrhythmia Service, Beth Israel Deaconess Medical Center, 185 Pilgrim Road, Palmer 4, Boston, MA 02215, USA; Harvard Medical School, Boston, MA, USA
| | - Zain Virk
- Harvard Medical School, Boston, MA, USA; Department of Medicine, Vanderbilt University Medical Center, 1161 21st Avenue South, Nashville, TN, USA
| | - Andre d'Avila
- Harvard Thorndike Electrophysiology Institute and Arrhythmia Service, Beth Israel Deaconess Medical Center, 185 Pilgrim Road, Palmer 4, Boston, MA 02215, USA; Harvard Medical School, Boston, MA, USA.
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Sramko M, Abdel-Kafi S, Wijnmaalen AP, Tao Q, van der Geest RJ, Lamb HJ, Zeppenfeld K. Head-to-Head Comparison of T1 Mapping and Electroanatomical Voltage Mapping in Patients With Ventricular Arrhythmias. JACC Clin Electrophysiol 2022:S2405-500X(22)00952-5. [PMID: 36752459 DOI: 10.1016/j.jacep.2022.10.035] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2022] [Revised: 09/20/2022] [Accepted: 10/19/2022] [Indexed: 01/20/2023]
Abstract
BACKGROUND Electroanatomical voltage mapping (EAVM) has been compared with late gadolinium enhancement cardiovascular magnetic resonance (LGE-CMR), which cannot delineate diffuse fibrosis. T1-mapping CMR overcomes the limitations of LGE-CMR, but it has not been directly compared against EAVM. OBJECTIVES This study aims to assess the relationship between left ventricular (LV) endocardial voltage obtained by EAVM and extracellular volume (ECV) obtained by T1 mapping. METHODS The study investigated patients who underwent endocardial EAVM for ventricular arrhythmias (CARTO 3, Biosense Webster) together with preprocedural contrast-enhanced T1 mapping (Ingenia 3T, Philips Healthcare). After image integration, EAVM datapoints were projected onto LGE-CMR and ECV-encoded images. Average values of unipolar voltage (UV), bipolar voltage (BV), LGE transmurality, and ECV were merged from corresponding cardiac segments (6 per slice) and pooled for analysis. RESULTS The analysis included data from 628 segments from 18 patients (57 ± 13 years of age, 17% females, LV ejection fraction 48% ± 14%, nonischemic/ischemic cardiomyopathy/controls: 8/6/4 patients). Based on the 95th and 5th percentile values obtained from the controls, ECV >33%, BV <2.9 mV, and UV <6.7 mV were considered abnormal. There was a significant inverse association between voltage and ECV, but only in segments with abnormal ECV. Increased ECV could predict abnormal BV and UV with acceptable accuracy (area under the curve of 0.78 [95% CI: 0.74-0.83] and 0.84 [95% CI: 0.79-0.88]). CONCLUSIONS This study found a significant inverse relationship between LV endocardial voltage and ECV. Real-time integration of T1 mapping may guide catheter mapping and may allow identification of areas of diffuse fibrosis potentially related to ventricular arrhythmias.
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Affiliation(s)
- Marek Sramko
- Department of Cardiology, Institute for Clinical and Experimental Medicine, Prague, Czech Republic; First Faculty of Medicine, Charles University, Prague, Czech Republic
| | - Saif Abdel-Kafi
- Willem Einthoven Center for Cardiac Arrhythmia Research and Management (WECAM), Leiden, the Netherlands; Department of Cardiology, Heart-Lung-Centre, Leiden University Medical Center, Leiden, the Netherlands
| | - Adrianus P Wijnmaalen
- Willem Einthoven Center for Cardiac Arrhythmia Research and Management (WECAM), Leiden, the Netherlands; Department of Cardiology, Heart-Lung-Centre, Leiden University Medical Center, Leiden, the Netherlands
| | - Qian Tao
- Department of Imaging Physics, Delft University of Technology, Delft, the Netherlands
| | - Rob J van der Geest
- Division of Image Processing (LKEB), Department of Radiology, Leiden University Medical Center, Leiden, the Netherlands
| | - Hildo J Lamb
- Department of Radiology, Leiden University Medical Center, Leiden, the Netherlands
| | - Katja Zeppenfeld
- Willem Einthoven Center for Cardiac Arrhythmia Research and Management (WECAM), Leiden, the Netherlands; Department of Cardiology, Heart-Lung-Centre, Leiden University Medical Center, Leiden, the Netherlands.
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Van Schie MS, Knops P, Zhang L, Van Schaagen FRN, Taverne YJHJ, De Groot NMS. Detection of endo-epicardial atrial low-voltage areas using unipolar and omnipolar voltage mapping. Front Physiol 2022; 13:1030025. [PMID: 36277177 PMCID: PMC9582746 DOI: 10.3389/fphys.2022.1030025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2022] [Accepted: 09/22/2022] [Indexed: 11/13/2022] Open
Abstract
Background: Low-voltage areas (LVA) can be located exclusively at either the endocardium or epicardium. This has only been demonstrated for bipolar voltages, but the value of unipolar and omnipolar voltages recorded from either the endocardium and epicardium in predicting LVAs at the opposite layer remains unknown. The goal of this study was therefore to compare simultaneously recorded endo-epicardial unipolar and omnipolar potentials and to determine whether their voltage characteristics are predictive for opposite LVAs.Methods: Intra-operative simultaneous endo-epicardial mapping (256 electrodes, interelectrode distances 2 mm) was performed during sinus rhythm at the right atrium in 93 patients (67 ± 9 years, 73 male). Cliques of four electrodes (2 × 2 mm) were used to define maximal omnipolar (Vomni,max) and unipolar (Vuni,max) voltages. LVAs were defined as Vomni,max ≤0.5 mV or Vuni,max ≤1.0 mV.Results: The majority of both unipolar and omnipolar LVAs were located at only the endocardium (74.2% and 82.0% respectively) or epicardium (52.7% and 47.6% respectively). Of the endocardial unipolar LVAs, 25.8% were also located at the opposite layer and 47.3% vice-versa. In omnipolar LVAs, 18.0% of the endocardial LVAs were also located at the epicardium and 52.4% vice-versa. The combination of epicardial Vuni,max and Vomni,max was most accurate in identifying dual-layer LVAs (50.4%).Conclusion: Unipolar and omnipolar LVAs are frequently located exclusively at either the endocardium or epicardium. Endo-epicardial LVAs are most accurately identified using combined epicardial unipolar and omnipolar voltages. Therefore, a combined endo-epicardial unipolar and omnipolar mapping approach is favoured as it may be more indicative of possible arrhythmogenic substrates.
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Affiliation(s)
| | - Paul Knops
- Department of Cardiology, Erasmus Medical Center, Rotterdam, Netherlands
| | - Lu Zhang
- Department of Cardiology, Erasmus Medical Center, Rotterdam, Netherlands
| | | | | | - Natasja M. S. De Groot
- Department of Cardiology, Erasmus Medical Center, Rotterdam, Netherlands
- *Correspondence: Natasja M. S. De Groot,
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Chen HS, Jungen C, Kimura Y, Dibbets-Schneider P, Piers SR, Androulakis AFA, van der Geest RJ, de Geus-Oei LF, Scholte AJHA, Lamb HJ, Jongbloed MRM, Zeppenfeld K. Ventricular Arrhythmia Substrate Distribution and Its Relation to Sympathetic Innervation in Nonischemic Cardiomyopathy Patients. JACC Clin Electrophysiol 2022; 8:1234-1245. [PMID: 36265999 DOI: 10.1016/j.jacep.2022.07.006] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2022] [Revised: 06/14/2022] [Accepted: 07/09/2022] [Indexed: 10/14/2022]
Abstract
BACKGROUND Nonischemic cardiomyopathy patients referred for catheter ablation of ventricular arrhythmias (VAs) typically have either inferolateral (ILS) or anteroseptal (ASS) VA substrate locations, with poorer outcomes for ASS. Sympathetic denervation is an important determinant of arrhythmogenicity. Its relation to nonischemic fibrosis in general and to the different VA substrates is unknown. OBJECTIVES This study sought to evaluate the association between VA substrates, myocardial fibrosis, and sympathetic denervation. METHODS Thirty-five patients from the Leiden Nonischemic Cardiomyopathy Study, who underwent electroanatomic voltage mapping and iodine-123 metaiodobenzylguanidine imaging between 2011 and 2018 were included. Late gadolinium-enhanced cardiac magnetic resonance data were collected when available. The relation between global cardiac sympathetic innervation and area-weighted unipolar voltage (UV) as a surrogate for diffuse fibrosis was evaluated. For regional analysis, patients were categorized as ASS or ILS. The distribution of low UV, sympathetic denervation, and late gadolinium enhancement (LGE) scar were compared using the 17-segment model. RESULTS Median area-weighted UV was 12.3 mV in patients with normal sympathetic innervation and 8.7 mV in patients with sympathetic denervation. Global sympathetic denervation correlated with diffuse myocardial fibrosis (R = 0.53; P = 0.02). ILS (n = 13) matched with low UV, sympathetic denervation, and LGE scar in all patients, whereas ASS (n = 11) matched with low UV in all patients, with LGE scar in 63% (P = 0.20), but with sympathetic denervation in only 27% of patients (P = 0.0002). CONCLUSIONS Global cardiac sympathetic denervation is related to fibrosis in nonischemic cardiomyopathy patients with VA. The mismatch between regional fibrosis and preserved innervation for ASS may contribute to a VA substrate difficult to control by catheter ablation.
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Affiliation(s)
- H Sophia Chen
- Department of Cardiology, Willem Einthoven Center for Cardiac Arrhythmia Research and Management, Leiden University Medical Center, Leiden, the Netherlands; Department of Anatomy and Embryology, Leiden University Medical Center, Leiden, the Netherlands
| | - Christiane Jungen
- Department of Cardiology, Willem Einthoven Center for Cardiac Arrhythmia Research and Management, Leiden University Medical Center, Leiden, the Netherlands; Department of Cardiology, University Heart and Vascular Center Hamburg, University Hospital Hamburg-Eppendorf, Germany
| | - Yoshitaka Kimura
- Department of Cardiology, Willem Einthoven Center for Cardiac Arrhythmia Research and Management, Leiden University Medical Center, Leiden, the Netherlands
| | | | - Sebastiaan R Piers
- Department of Cardiology, Willem Einthoven Center for Cardiac Arrhythmia Research and Management, Leiden University Medical Center, Leiden, the Netherlands
| | - Alexander F A Androulakis
- Department of Cardiology, Willem Einthoven Center for Cardiac Arrhythmia Research and Management, Leiden University Medical Center, Leiden, the Netherlands
| | - Rob J van der Geest
- Department of Radiology, Leiden University Medical Center, Leiden, the Netherlands
| | - Lioe-Fee de Geus-Oei
- Department of Radiology, Leiden University Medical Center, Leiden, the Netherlands
| | - Arthur J H A Scholte
- Department of Cardiology, Willem Einthoven Center for Cardiac Arrhythmia Research and Management, Leiden University Medical Center, Leiden, the Netherlands
| | - Hildo J Lamb
- Department of Radiology, Leiden University Medical Center, Leiden, the Netherlands
| | - Monique R M Jongbloed
- Department of Cardiology, Willem Einthoven Center for Cardiac Arrhythmia Research and Management, Leiden University Medical Center, Leiden, the Netherlands; Department of Anatomy and Embryology, Leiden University Medical Center, Leiden, the Netherlands
| | - Katja Zeppenfeld
- Department of Cardiology, Willem Einthoven Center for Cardiac Arrhythmia Research and Management, Leiden University Medical Center, Leiden, the Netherlands.
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40
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Kattel S, Enriquez AD. Contemporary approach to catheter ablation of ventricular tachycardia in nonischemic cardiomyopathy. J Interv Card Electrophysiol 2022; 66:793-805. [PMID: 36056222 DOI: 10.1007/s10840-022-01363-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/18/2022] [Accepted: 08/29/2022] [Indexed: 11/30/2022]
Abstract
Nonischemic cardiomyopathy (NICM) comprises a heterogenous group of disorders with myocardial dysfunction unrelated to significant coronary disease. As the use of implantable defibrillators has increased in this patient population, catheter ablation is being utilized more frequently to treat NICM patients with ventricular tachycardia (VT). Progress has been made in identifying multiple subtypes of NICM with variable scar patterns. The distribution of scar is often mid-myocardial and subepicardial, and identifying and ablating this substrate can be challenging. Here, we will review the current understanding of NICM subtypes and the outcomes of VT ablation in this population. We will discuss the use of cardiac imaging, electrocardiography, and electroanatomic mapping to define the VT substrate and the ablation techniques required to successfully prevent VT recurrence.
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Affiliation(s)
- Sharma Kattel
- Cardiovascular Medicine, Yale University School of Medicine, PO Box 208017, New Haven, CT, 06520-8017, USA
| | - Alan D Enriquez
- Cardiovascular Medicine, Yale University School of Medicine, PO Box 208017, New Haven, CT, 06520-8017, USA.
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Cheng WH, Chung FP, Lin YJ, Lo LW, Chang SL, Hu YF, Tuan TC, Chao TF, Liao JN, Lin CY, Chang TY, Kuo L, Wu CI, Liu CM, Liu SH, Chen SA. Catheter Ablation in Arrhythmic Cardiac Diseases: Endocardial and Epicardial Ablation. Rev Cardiovasc Med 2022; 23:324. [PMID: 39077706 PMCID: PMC11262352 DOI: 10.31083/j.rcm2309324] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2022] [Revised: 08/12/2022] [Accepted: 08/17/2022] [Indexed: 07/31/2024] Open
Abstract
Arrhythmogenic cardiomyopathy (ACM) is a group of arrhythmogenic disorders of the myocardium that are not caused by ischemic, hypertensive, or valvular heart disease. The clinical manifestations of ACMs may overlap those of dilated cardiomyopathy, complicating the differential diagnosis. In several ACMs, ventricular tachycardia (VT) has been observed at an early stage, regardless of the severity of the disease. Therefore, preventing recurrences of VT can be a clinical challenge. There is a wide range of efficacy and side effects associated with the use of antiarrhythmic drugs (AADs) in the treatment of VT. In addition to AADs, patients with ACM and ventricular tachyarrhythmias may benefit from catheter ablation, especially if they are drug-refractory. The differences in pathogenesis between the various types of ACMs can lead to heterogeneous distributions of arrhythmogenic substrates, non-uniform ablation strategies, and distinct ablation outcomes. Ablation has been documented to be effective in eliminating ventricular tachyarrhythmias in arrhythmogenic right ventricular dysplasia (ARVC), sarcoidosis, Chagas cardiomyopathy, and Brugada syndrome (BrS). As an entity that is rare in nature, ablation for ventricular tachycardia in certain forms of ACM may only be reported through case reports, such as amyloidosis and left ventricular noncompaction. Several types of ACMs, including ARVC, sarcoidosis, Chagas cardiomyopathy, BrS, and left ventricular noncompaction, may exhibit diseased substrates within or adjacent to the epicardium that may be accountable for ventricular arrhythmogenesis. As a result, combining endocardial and epicardial ablation is of clinical importance for successful ablation. The purpose of this article is to provide a comprehensive overview of the substrate characteristics, ablation strategies, and ablation outcomes of various types of ACMs using endocardial and epicardial approaches.
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Affiliation(s)
- Wen-Han Cheng
- Heart Rhythm Center and Division of Cardiology, Department of Medicine, Taipei Veterans General Hospital, 11217 Taipei, Taiwan
- Department of Medicine, School of Medicine, National Yang Ming Chiao Tung University, 112304 Taipei, Taiwan
- Department of Medicine, Taipei Veterans General Hospital Taitung Branch, 95050 Taitung, Taiwan
| | - Fa-Po Chung
- Heart Rhythm Center and Division of Cardiology, Department of Medicine, Taipei Veterans General Hospital, 11217 Taipei, Taiwan
- Department of Medicine, School of Medicine, National Yang Ming Chiao Tung University, 112304 Taipei, Taiwan
| | - Yenn-Jiang Lin
- Heart Rhythm Center and Division of Cardiology, Department of Medicine, Taipei Veterans General Hospital, 11217 Taipei, Taiwan
- Department of Medicine, School of Medicine, National Yang Ming Chiao Tung University, 112304 Taipei, Taiwan
| | - Li-Wei Lo
- Heart Rhythm Center and Division of Cardiology, Department of Medicine, Taipei Veterans General Hospital, 11217 Taipei, Taiwan
- Department of Medicine, School of Medicine, National Yang Ming Chiao Tung University, 112304 Taipei, Taiwan
| | - Shih-Lin Chang
- Heart Rhythm Center and Division of Cardiology, Department of Medicine, Taipei Veterans General Hospital, 11217 Taipei, Taiwan
- Department of Medicine, School of Medicine, National Yang Ming Chiao Tung University, 112304 Taipei, Taiwan
| | - Yu-Feng Hu
- Heart Rhythm Center and Division of Cardiology, Department of Medicine, Taipei Veterans General Hospital, 11217 Taipei, Taiwan
- Department of Medicine, School of Medicine, National Yang Ming Chiao Tung University, 112304 Taipei, Taiwan
| | - Ta-Chuan Tuan
- Heart Rhythm Center and Division of Cardiology, Department of Medicine, Taipei Veterans General Hospital, 11217 Taipei, Taiwan
- Department of Medicine, School of Medicine, National Yang Ming Chiao Tung University, 112304 Taipei, Taiwan
| | - Tze-Fan Chao
- Heart Rhythm Center and Division of Cardiology, Department of Medicine, Taipei Veterans General Hospital, 11217 Taipei, Taiwan
- Department of Medicine, School of Medicine, National Yang Ming Chiao Tung University, 112304 Taipei, Taiwan
| | - Jo-Nan Liao
- Heart Rhythm Center and Division of Cardiology, Department of Medicine, Taipei Veterans General Hospital, 11217 Taipei, Taiwan
- Department of Medicine, School of Medicine, National Yang Ming Chiao Tung University, 112304 Taipei, Taiwan
| | - Chin-Yu Lin
- Heart Rhythm Center and Division of Cardiology, Department of Medicine, Taipei Veterans General Hospital, 11217 Taipei, Taiwan
- Department of Medicine, School of Medicine, National Yang Ming Chiao Tung University, 112304 Taipei, Taiwan
| | - Ting-Yung Chang
- Heart Rhythm Center and Division of Cardiology, Department of Medicine, Taipei Veterans General Hospital, 11217 Taipei, Taiwan
- Department of Medicine, School of Medicine, National Yang Ming Chiao Tung University, 112304 Taipei, Taiwan
| | - Ling Kuo
- Heart Rhythm Center and Division of Cardiology, Department of Medicine, Taipei Veterans General Hospital, 11217 Taipei, Taiwan
- Department of Medicine, School of Medicine, National Yang Ming Chiao Tung University, 112304 Taipei, Taiwan
| | - Cheng-I Wu
- Heart Rhythm Center and Division of Cardiology, Department of Medicine, Taipei Veterans General Hospital, 11217 Taipei, Taiwan
- Department of Medicine, School of Medicine, National Yang Ming Chiao Tung University, 112304 Taipei, Taiwan
| | - Chih-Min Liu
- Heart Rhythm Center and Division of Cardiology, Department of Medicine, Taipei Veterans General Hospital, 11217 Taipei, Taiwan
- Department of Medicine, School of Medicine, National Yang Ming Chiao Tung University, 112304 Taipei, Taiwan
| | - Shin-Huei Liu
- Heart Rhythm Center and Division of Cardiology, Department of Medicine, Taipei Veterans General Hospital, 11217 Taipei, Taiwan
- Department of Medicine, School of Medicine, National Yang Ming Chiao Tung University, 112304 Taipei, Taiwan
| | - Shih-Ann Chen
- Heart Rhythm Center and Division of Cardiology, Department of Medicine, Taipei Veterans General Hospital, 11217 Taipei, Taiwan
- Department of Medicine, School of Medicine, National Yang Ming Chiao Tung University, 112304 Taipei, Taiwan
- Cardiovascular Center, Taichung Veterans General Hospital, 40705 Taichung, Taiwan
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Hawson J, Al-Kaisey A, Anderson RD, Watts T, Morton J, Kumar S, Kistler P, Kalman J, Lee G. Substrate-based approaches in ventricular tachycardia ablation. Indian Pacing Electrophysiol J 2022; 22:273-285. [PMID: 36007824 PMCID: PMC9649336 DOI: 10.1016/j.ipej.2022.08.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2022] [Revised: 07/23/2022] [Accepted: 08/16/2022] [Indexed: 11/30/2022] Open
Abstract
Catheter ablation for ventricular tachycardia (VT) in patients with structural heart disease is now part of standard care. Mapping and ablation of the clinical VT is often limited when the VT is noninducible, nonsustained or not haemodynamically tolerated. Substrate-based ablation strategies have been developed in an aim to treat VT in this setting and, subsequently, have been shown to improve outcomes in VT ablation when compared to focused ablation of mapped VTs. Since the initial description of linear ablation lines targeting ventricular scar, many different approaches to substrate-based VT ablation have been developed. Strategies can broadly be divided into three categories: 1) targeting abnormal electrograms, 2) anatomical targeting of conduction channels between areas of myocardial scar, and 3) targeting areas of slow and/or decremental conduction, identified with “functional” substrate mapping techniques. This review summarises contemporary substrate-based ablation strategies, along with their strengths and weaknesses.
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Affiliation(s)
- Joshua Hawson
- Department of Cardiology, Royal Melbourne Hospital, Melbourne, Victoria, Australia; Faculty of Medicine, Dentistry and Health Science, University of Melbourne, Melbourne, Victoria, Australia
| | - Ahmed Al-Kaisey
- Department of Cardiology, Royal Melbourne Hospital, Melbourne, Victoria, Australia; Faculty of Medicine, Dentistry and Health Science, University of Melbourne, Melbourne, Victoria, Australia
| | - Robert D Anderson
- Department of Cardiology, Royal Melbourne Hospital, Melbourne, Victoria, Australia; Faculty of Medicine, Dentistry and Health Science, University of Melbourne, Melbourne, Victoria, Australia
| | - Troy Watts
- Department of Cardiology, Royal Melbourne Hospital, Melbourne, Victoria, Australia
| | - Joseph Morton
- Department of Cardiology, Royal Melbourne Hospital, Melbourne, Victoria, Australia
| | - Saurabh Kumar
- Department of Cardiology, Westmead Hospital and Westmead Applied Research Centre, Westmead, New South Wales, Australia; Western Clinical School, Faculty of Medicine and Health, The University of Sydney, Sydney, New South Wales, Australia
| | - Peter Kistler
- Faculty of Medicine, Dentistry and Health Science, University of Melbourne, Melbourne, Victoria, Australia; Department of Cardiology, The Alfred Hospital, Melbourne, Victoria, Australia
| | - Jonathan Kalman
- Department of Cardiology, Royal Melbourne Hospital, Melbourne, Victoria, Australia; Faculty of Medicine, Dentistry and Health Science, University of Melbourne, Melbourne, Victoria, Australia
| | - Geoffrey Lee
- Department of Cardiology, Royal Melbourne Hospital, Melbourne, Victoria, Australia; Faculty of Medicine, Dentistry and Health Science, University of Melbourne, Melbourne, Victoria, Australia.
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Monomorphic VT Non-Inducibility after Electrical Storm Ablation Reduces Mortality and Recurrences. J Clin Med 2022; 11:jcm11133887. [PMID: 35807170 PMCID: PMC9267206 DOI: 10.3390/jcm11133887] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2022] [Revised: 06/28/2022] [Accepted: 07/01/2022] [Indexed: 02/01/2023] Open
Abstract
Background: Electrical storm (ES) is defined by clustering episodes of ventricular tachycardia (VT) and is associated with severe long-term outcomes. We sought to evaluate the prognostic impact of radiofrequency catheter ablation (RFCA) in ES as assessed by aggressive programmed ventricular stimulation (PVS). Methods: Single-center retrospective longitudinal study with 82 consecutive ES patients referred for RFCA with a median follow-up (IQR 25−75%) of 45.43 months (15−69.86). All-cause mortality and VT recurrences were assessed in relation to RFCA outcomes defined by 4-extrastimuli PVS: Class 1—no ventricular arrhythmia; Class 2—no sustained monomorphic VTs (mVT) inducible, but non-sustained mVTs, polymorphic VTs, or VF inducible; Class 3—clinical VT non-inducible, other sustained mVTs inducible; and Class 4—clinical VT inducible. Results: Class 1, Class 2, Class 3, and Class 4 were achieved in 56.1%, 13.4%, 23.2%, and 7.4% of cases, respectively. The combined outcome of Class 1 + Class 2 (no sustained monomorphic VT inducible) led to improved survival (log-rank p < 0.001) and reduced VT recurrence (log-rank p < 0.001). Residual monomorphic VT inducibility (HR 6.262 (95% CI: 2.165−18.108, p = 0.001), NYHA IV heart failure symptoms (HR 20.519 (95% CI: 1.623−259.345), p = 0.02)), and age (HR 1.009 (95% CI: 1.041−1.160), p = 0.001)) independently predicted death during follow-up. LVEF was not predictive of death (HR 1.003 (95% CI: 0.946−1.063) or recurrences (HR 0.988 (95% CI: 0.955−1.021)). Conclusions: Non-inducibility for sustained mVTs after aggressive PVS post-RFCA leads to improved survival in ES, independently of LVEF.
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Vrtovec B, Frljak S, Poglajen G, Zemljic G, Cerar A, Sever M, Haddad F, Wu JC. A PILOT CLINICAL TRIAL OF CELL THERAPY IN HEART FAILURE WITH PRESERVED EJECTION FRACTION. Eur J Heart Fail 2022; 24:1441-1449. [PMID: 35775390 PMCID: PMC9540623 DOI: 10.1002/ejhf.2596] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/15/2022] [Revised: 05/19/2022] [Accepted: 06/20/2022] [Indexed: 12/02/2022] Open
Abstract
Aims We investigated the effects of CD34+ cell therapy in patients with heart failure with preserved ejection fraction (HFpEF). Methods and results In a prospective pilot study, we enrolled 30 patients with HFpEF. In Phase 1, patients were treated with medical therapy for 6 months. Thereafter, all patients underwent CD34+ cell transplantation. Using electroanatomical mapping, we measured local mechanical diastolic delay and myocardial viability to guide the targeting of cell injections. Patients were followed for 6 months after cell transplantation (Phase 2), and the primary endpoint was the difference in change in E/e′ between Phase 1 and Phase 2. In Phase 1, the decrease in E/e′ was significantly less pronounced than in Phase 2 (−0.33 ± 1.72 vs. −3.77 ± 2.66, p = 0.001). During Phase 1, there was no significant change in global systolic strain (GLS; from −12.5 ± 2.4% to −12.8 ± 2.6%, p = 0.77), N‐terminal pro‐B‐type natriuretic peptide (NT‐proBNP; from 1463 ± 1247 pg/ml to 1298 ± 931 pg/ml, p = 0.31), or 6‐min walk test (6MWT; from 391 ± 75 m to 402 ± 93 m, p = 0.42). In Phase 2, an improvement was noted in NT‐proBNP (from 1298 ± 931 pg/ml to 887 ± 809 pg/ml, p = 0.02) and 6MWT (from 402 ± 93 m to 438 ± 72 m, p = 0.02). Although GLS did not change significantly in Phase 2 (from −12.8 ± 2.6% to −13.8 ± 2.7%, p = 0.36), we found improved local systolic strain at cell injection sites (−3.4 ± 6.8%, p = 0.005). Conclusions In this non‐randomized trial, transendocardial CD34+ cell therapy in HFpEF was associated with an improvement in E/e′, NT‐proBNP, exercise capacity, and local myocardial strain at the cell injection sites. Clinical Trial Registration: ClinicalTrials.gov NCT02923609.
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Affiliation(s)
- Bojan Vrtovec
- Advanced Heart Failure and Transplantation Center, Department of Cardiology, UMC Ljubljana, Slovenia
| | - Sabina Frljak
- Advanced Heart Failure and Transplantation Center, Department of Cardiology, UMC Ljubljana, Slovenia
| | - Gregor Poglajen
- Advanced Heart Failure and Transplantation Center, Department of Cardiology, UMC Ljubljana, Slovenia
| | - Gregor Zemljic
- Advanced Heart Failure and Transplantation Center, Department of Cardiology, UMC Ljubljana, Slovenia
| | - Andraz Cerar
- Advanced Heart Failure and Transplantation Center, Department of Cardiology, UMC Ljubljana, Slovenia
| | - Matjaz Sever
- Department of Hematology, UMC Ljubljana, Slovenia
| | - Francois Haddad
- Stanford Cardiovascular Institute, Stanford University School of Medicine, Stanford, CA, USA
| | - Joseph C Wu
- Stanford Cardiovascular Institute, Stanford University School of Medicine, Stanford, CA, USA
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Naeemah QJ, Komatsu Y, Nogami A, Sekiguchi Y, Igarashi M, Yamasaki H, Shinoda Y, Aonuma K, Ieda M. Catheter Ablation of Ventricular Tachycardia in Dilated‐Phase Hypertrophic Cardiomyopathy: Substrate Characterization and Ablation Outcome. Pacing Clin Electrophysiol 2022; 45:773-785. [DOI: 10.1111/pace.14508] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/26/2021] [Revised: 03/22/2022] [Accepted: 04/01/2022] [Indexed: 11/29/2022]
Affiliation(s)
- Qasim J. Naeemah
- Department of Cardiology, Faculty of Medicine University of Tsukuba Tennodai Japan
| | - Yuki Komatsu
- Department of Cardiology, Faculty of Medicine University of Tsukuba Tennodai Japan
| | - Akihiko Nogami
- Department of Cardiology, Faculty of Medicine University of Tsukuba Tennodai Japan
| | - Yukio Sekiguchi
- Department of Cardiology, Faculty of Medicine University of Tsukuba Tennodai Japan
| | - Miyako Igarashi
- Department of Cardiology, Faculty of Medicine University of Tsukuba Tennodai Japan
| | - Hiro Yamasaki
- Department of Cardiology, Faculty of Medicine University of Tsukuba Tennodai Japan
| | - Yasutoshi Shinoda
- Department of Cardiology, Faculty of Medicine University of Tsukuba Tennodai Japan
| | - Kazutaka Aonuma
- Department of Cardiology, Faculty of Medicine University of Tsukuba Tennodai Japan
| | - Masaki Ieda
- Department of Cardiology, Faculty of Medicine University of Tsukuba Tennodai Japan
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46
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Graham AJ, Orini M, Zacur E, Dhillon G, Jones D, Prabhu S, Pugliese F, Lowe M, Ahsan S, Earley MJ, Chow A, Sporton S, Dhinoja M, Hunter RJ, Schilling RJ, Lambiase PD. Assessing Noninvasive Delineation of Low-Voltage Zones Using ECG Imaging in Patients With Structural Heart Disease. JACC Clin Electrophysiol 2022; 8:426-436. [PMID: 35450597 DOI: 10.1016/j.jacep.2021.11.011] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2021] [Revised: 11/12/2021] [Accepted: 11/16/2021] [Indexed: 11/16/2022]
Abstract
OBJECTIVES This study sought to assess the association between electrocardiographic imaging (ECGI) parameters and voltage from simultaneous electroanatomic mapping (EAM). BACKGROUND ECGI offers noninvasive assessment of electrophysiologic features relevant for mapping ventricular arrhythmia and its substrate, but the accuracy of ECGI in the delineation of scar is unclear. METHODS Sixteen patients with structural heart disease underwent simultaneous ECGI (CardioInsight, Medtronic) and contact EAM (CARTO, Biosense-Webster) during ventricular tachycardia catheter ablation, with 7 mapped epicardially. ECGI and EAM geometries were coregistered using anatomic landmarks. ECGI points were paired to the closest site on the EAM within 10 mm. The association between EAM voltage and ECGI features from reconstructed epicardial unipolar electrograms was assessed by mixed-effects regression models. The classification of low-voltage regions was performed using receiver-operating characteristic analysis. RESULTS A total of 9,541 ECGI points (median: 596; interquartile range: 377-737 across patients) were paired to an EAM site. Epicardial EAM voltage was associated with ECGI features of signal fractionation and local repolarization dispersion (N = 7; P < 0.05), but they poorly classified sites with bipolar voltage of <1.5 mV or <0.5 mV thresholds (median area under the curve across patients: 0.50-0.62). No association was found between bipolar EAM voltage and low-amplitude reconstructed epicardial unipolar electrograms or ECGI-derived bipolar electrograms. Similar results were found in the combined cohort (n = 16), including endocardial EAM voltage compared to epicardial ECGI features (n = 9). CONCLUSIONS Despite a statistically significant association between ECGI features and EAM voltage, the accuracy of the delineation of low-voltage zones was modest. This may limit ECGI use for pr-procedural substrate analysis in ventricular tachycardia ablation, but it could provide value in risk assessment for ventricular arrhythmias.
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Affiliation(s)
- Adam J Graham
- Barts Heart Centre, Barts Health National Health Service Trust, London, United Kingdom
| | - Michele Orini
- Barts Heart Centre, Barts Health National Health Service Trust, London, United Kingdom; Institute of Cardiovascular Science, University College London, London, United Kingdom
| | - Ernesto Zacur
- Institute of Biomedical Engineering, University of Oxford, Oxford, United Kingdom
| | - Gurpreet Dhillon
- Barts Heart Centre, Barts Health National Health Service Trust, London, United Kingdom
| | - Daniel Jones
- Barts Heart Centre, Barts Health National Health Service Trust, London, United Kingdom
| | - Sandeep Prabhu
- Department of Cardiology, The Alfred Hospital, Melbourne, Australia
| | - Francesca Pugliese
- Barts Heart Centre, Barts Health National Health Service Trust, London, United Kingdom
| | - Martin Lowe
- Barts Heart Centre, Barts Health National Health Service Trust, London, United Kingdom
| | - Syed Ahsan
- Barts Heart Centre, Barts Health National Health Service Trust, London, United Kingdom
| | - Mark J Earley
- Barts Heart Centre, Barts Health National Health Service Trust, London, United Kingdom
| | - Anthony Chow
- Barts Heart Centre, Barts Health National Health Service Trust, London, United Kingdom
| | - Simon Sporton
- Barts Heart Centre, Barts Health National Health Service Trust, London, United Kingdom
| | - Mehul Dhinoja
- Barts Heart Centre, Barts Health National Health Service Trust, London, United Kingdom
| | - Ross J Hunter
- Barts Heart Centre, Barts Health National Health Service Trust, London, United Kingdom
| | - Richard J Schilling
- Barts Heart Centre, Barts Health National Health Service Trust, London, United Kingdom
| | - Pier D Lambiase
- Barts Heart Centre, Barts Health National Health Service Trust, London, United Kingdom; Institute of Cardiovascular Science, University College London, London, United Kingdom.
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47
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Utility of Multipolar Catheter for Characterizing Myocardial Substrate in a Porcine Post Myocardial Infarction Model. JACC Clin Electrophysiol 2022; 8:450-452. [PMID: 35450599 DOI: 10.1016/j.jacep.2022.01.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2021] [Accepted: 01/02/2022] [Indexed: 11/21/2022]
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48
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Wiles BM, Li AC, Waight MC, Saba MM. Contemporary Management of Complex Ventricular Arrhythmias. Arrhythm Electrophysiol Rev 2022; 11:e04. [PMID: 35734144 PMCID: PMC9194914 DOI: 10.15420/aer.2021.66] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/29/2021] [Accepted: 02/06/2022] [Indexed: 12/02/2022] Open
Abstract
Percutaneous catheter ablation is an effective and safe therapy that can eliminate ventricular tachycardia, reducing the risks of both recurrent arrhythmia and shock therapies from a defibrillator. Successful ablation requires accurate identification of arrhythmic substrate and the effective delivery of energy to the targeted tissue. A thorough pre-procedural assessment is needed before considered 3D electroanatomical mapping can be performed. In contemporary practice, this must combine traditional electrophysiological techniques, such as activation and entrainment mapping, with more novel physiological mapping techniques for which there is an ever-increasing evidence base. Novel techniques to maximise energy delivery to the tissue must also be considered and balanced against their associated risks of complication. This review provides a comprehensive appraisal of contemporary practice and the evidence base that supports recent developments in mapping and ablation, while also considering potential future developments in the field.
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Affiliation(s)
- Benedict M Wiles
- Advanced Ventricular Arrhythmia Training and Research (AVATAR) Program, St George's University Hospitals NHS Foundation Trust, London, UK.,Cardiology Clinical Academic Group, St George's University of London, London, UK
| | - Anthony C Li
- Advanced Ventricular Arrhythmia Training and Research (AVATAR) Program, St George's University Hospitals NHS Foundation Trust, London, UK.,Cardiology Clinical Academic Group, St George's University of London, London, UK
| | - Michael C Waight
- Advanced Ventricular Arrhythmia Training and Research (AVATAR) Program, St George's University Hospitals NHS Foundation Trust, London, UK.,Cardiology Clinical Academic Group, St George's University of London, London, UK
| | - Magdi M Saba
- Advanced Ventricular Arrhythmia Training and Research (AVATAR) Program, St George's University Hospitals NHS Foundation Trust, London, UK.,Cardiology Clinical Academic Group, St George's University of London, London, UK
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49
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Bourier F, Busch S, Sommer P, Maurer T, Althoff T, Shin DI, Duncker D, Johnson V, Estner H, Rillig A, Bertagnolli L, Iden L, Deneke T, Tilz R, Metzner A, Chun J, Steven D. [Catheter ablation of ventricular tachycardias in patients with ischemic cardiomyopathy]. Herzschrittmacherther Elektrophysiol 2022; 33:88-97. [PMID: 35157112 DOI: 10.1007/s00399-022-00845-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2022] [Accepted: 02/03/2022] [Indexed: 10/19/2022]
Abstract
Radiofrequency (RF) ablation is an effective treatment option of scar-related ventricular tachycardias (VT) in patients with ischemic cardiomyopathy. Several studies proved the benefit of VT catheter ablation, which has become routine in most electrophysiology laboratories. This article provides practical instructions to perform a VT catheter ablation. The authors describe conventional and substrate-based mapping and ablation strategies as well as concepts for image integration. This article continues a series of publications created for education in advanced electrophysiology.
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Affiliation(s)
- Felix Bourier
- Abteilung für Elektrophysiologie, Deutsches Herzzentrum München, Technische Universität München, München, Deutschland.
| | - Sonia Busch
- Medizinische Klinik, Klinikum Coburg GmbH, Coburg, Deutschland
| | - Philipp Sommer
- Klinik für Elektrophysiologie/Rhythmologie, Herz- und Diabeteszentrum NRW, Ruhr-Universität Bochum, Bad Oeynhausen, Deutschland
| | - Tilman Maurer
- Klinik für Kardiologie, Asklepios Klinik St. Georg, Hamburg, Deutschland
| | - Till Althoff
- Med. Klinik m.S. Kardiologie u. Angiologie, Charité - Universitätsmedizin Medizin Berlin, Berlin, Deutschland
| | - Dong-In Shin
- Klinik für Kardiologie, Herzzentrum Niederrhein, HELIOS Klinikum Krefeld, Krefeld, Deutschland.,Center for Clinical Medicine Witten-Herdecke, University Faculty of Health, Wuppertal, Deutschland
| | - David Duncker
- Hannover Herzrhythmus Centrum, Klinik für Kardiologie und Angiologie, Medizinische Hochschule Hannover, Hannover, Deutschland
| | - Victoria Johnson
- Klinik für Innere Medizin, Universitätsklinikum Gießen, Gießen, Deutschland
| | - Heidi Estner
- Medizinische Klinik und Poliklinik I, LMU Klinikum der Universität München, München, Deutschland
| | - Andreas Rillig
- Universitäres Herzzentrum Hamburg, Universitätsklinikum Eppendorf, Hamburg, Deutschland
| | - Livio Bertagnolli
- Abteilung für Rhythmologie, Herzzentrum HELIOS Leipzig, Leipzig, Deutschland
| | - Leon Iden
- Klinik für Kardiologie, Herz- und Gefäßzentrum Bad Segeberg, Bad Segeberg, Deutschland
| | - Thomas Deneke
- Klinik für Kardiologie, Rhön-Klinikum, Campus Bad Neustadt, Bad Neustadt a. d. Saale, Deutschland
| | - Roland Tilz
- Sektion für Elektrophysiologie, Medizinische Klinik II, Universitäres Herzzentrum Lübeck, Universitätsklinikum Schleswig-Holstein (UKSH), Lübeck, Deutschland
| | - Andreas Metzner
- Universitäres Herzzentrum Hamburg, Universitätsklinikum Eppendorf, Hamburg, Deutschland
| | - Julian Chun
- Cardioangiologisches Centrum Bethanien - CCB, Frankfurt, Deutschland
| | - Daniel Steven
- Abteilung für Elektrophysiologie, Herzzentrum der Uniklinik Köln, Köln, Deutschland
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50
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Bennett RG, Garikapati K, Anderson RD, Silva KD, Campbell T, Kotake Y, Turnbull S, Tonchev I, Lee G, Kalman J, Kumar S. Clinical, Electroanatomic and Electrophysiologic Characterisation and Outcomes of Catheter Ablation for Ventricular Tachycardia Following Valvular Intervention. J Cardiovasc Electrophysiol 2022; 33:589-604. [PMID: 35107192 DOI: 10.1111/jce.15388] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/09/2021] [Revised: 10/28/2021] [Accepted: 11/18/2021] [Indexed: 11/30/2022]
Abstract
INTRODUCTION Ventricular tachycardia (VT) can occur following valvular interventions. There are limited data describing substrate and ablation approaches in such patients. We sought to describe the clinical, electrophysiologic, electroanatomic features and catheter ablation outcomes of patients with VT following aortic and/or mitral valve intervention. METHODS Over 12-years, consecutive patients with aortic valve replacement (AVR) and/or mitral valve replacement (MVR) or repair, undergoing VT ablation, were identified from 2 centres. Clinical and procedural parameters, and outcomes are described. RESULTS Twenty-three patients (age 66±14years, 78% male, left ventricular ejection fraction 37±16%), with prior AVR (mechanical n=6, bioprosthetic n=2, transcatheter n=1), MVR (mechanical n=5, bioprosthetic n=1), mitral valve repair (n=6) and both mechanical AVR and MVR (n=2), underwent VT ablation. Sixteen had concurrent ischemic cardiomyopathy, 10 with prior bypass surgery. Left ventricular access was obtained in 21/23 (91%) patients (transseptal n=14, retrograde aortic n=5, transapical n=2), with perivalvular scar identified in 17/21 (81%). Re-entrant VT isthmi involved the perivalvular regions in 12/23 (52%) patients, and regions remote from the valve in the remainder; 9% had non-scar related VT. Intramural substrate was ablated from adjacent chambers in 5/23 (22%) patients and with half-normal saline irrigation in 8/23 (35%) patients. There were no instances of catheter entrapment. Following final ablation, VA-free survival was 78% at 13-months. CONCLUSION Only half of VT circuits following valvular interventions involve the valve regions themselves, whilst the remainder involve unrelated regions. Catheter ablation is safe and efficacious at treating VT following valvular intervention, but novel strategies may be required. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- Richard G Bennett
- Department of Cardiology, Westmead Hospital, Westmead Applied Research Centre, University of Sydney, Australia
| | - Kartheek Garikapati
- Department of Cardiology, Westmead Hospital, Westmead Applied Research Centre, University of Sydney, Australia
| | - Robert D Anderson
- Department of Cardiology, Royal Melbourne Hospital, Melbourne, Australia
| | | | - Timothy Campbell
- Department of Cardiology, Westmead Hospital, Westmead Applied Research Centre, University of Sydney, Australia
| | - Yasuhito Kotake
- Department of Cardiology, Westmead Hospital, Westmead Applied Research Centre, University of Sydney, Australia
| | - Samual Turnbull
- Department of Cardiology, Westmead Hospital, Westmead Applied Research Centre, University of Sydney, Australia
| | - Ivaylo Tonchev
- Department of Cardiology, Royal Melbourne Hospital, Melbourne, Australia
| | - Geoffrey Lee
- Department of Cardiology, Royal Melbourne Hospital, Melbourne, Australia
| | - Jonathan Kalman
- Department of Cardiology, Royal Melbourne Hospital, Melbourne, Australia
| | - Saurabh Kumar
- Department of Cardiology, Westmead Hospital, Westmead Applied Research Centre, University of Sydney, Australia
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