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Gardziejczyk P, Piotrowski R, Kryński T, Sikorska A, Kułakowski P, Baran J. Bipolar catheter ablation with dedicated radiofrequency system for highly refractory ventricular arrhythmia-Does the rate of success depend on arrhythmia origin? J Cardiovasc Electrophysiol 2024; 35:667-674. [PMID: 38293729 DOI: 10.1111/jce.16186] [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: 07/04/2023] [Revised: 11/28/2023] [Accepted: 01/06/2024] [Indexed: 02/01/2024]
Abstract
INTRODUCTION Despite rapid technological progress, some arrhythmias are still resistant to standard unipolar ablation. These include arrhythmias arising from the base of the heart, cardiac crux, or epicardium. Bipolar radiofrequency ablation (B-RFA) may be useful in some cases, however, data on the efficacy of this approach in various arrhythmia localizations are scarce. The aim of this study was to assess the efficacy of B-RFA in patients with ventricular arrhythmias originating from various locations, occurring refractory to standard unipolar ablation approaches. METHODS An observational, single center study was conducted over a 30-month period. B-RFA were performed using dedicated radio frequency (RF) generator and electroanatomic mapping system. RESULTS Twenty-four procedures, in 23 patients with a median (range) of 1 (1-2) previously failed unipolar ablation procedures, were included in the final analysis. There were 12 ablations of ventricular arrhythmias originating from interventricular septum with an acute success rate of 75%, and 12 from left ventricular (LV) summit with an acute success rate of 58%. The midterm success rate (median interquartile range follow-up of 205 days [188-338]) was 66% and 50%, respectively. CONCLUSIONS B-RFA is a promising method of catheter ablation for refractory cardiac arrhythmias. A higher success rate was observed in ablation for difficult ventricular arrhythmias originating from interventricular septal region than LV summit.
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Affiliation(s)
- Piotr Gardziejczyk
- Division of Clinical Electrophysiology, Department of Cardiology, Centre of Postgraduate Medical Education, Grochowski Hospital, Warsaw, Poland
| | - Roman Piotrowski
- Division of Clinical Electrophysiology, Department of Cardiology, Centre of Postgraduate Medical Education, Grochowski Hospital, Warsaw, Poland
| | - Tomasz Kryński
- Division of Clinical Electrophysiology, Department of Cardiology, Centre of Postgraduate Medical Education, Grochowski Hospital, Warsaw, Poland
| | - Agnieszka Sikorska
- Division of Clinical Electrophysiology, Department of Cardiology, Centre of Postgraduate Medical Education, Grochowski Hospital, Warsaw, Poland
| | - Piotr Kułakowski
- Division of Clinical Electrophysiology, Department of Cardiology, Centre of Postgraduate Medical Education, Grochowski Hospital, Warsaw, Poland
| | - Jakub Baran
- Division of Clinical Electrophysiology, Department of Cardiology, Centre of Postgraduate Medical Education, Grochowski Hospital, Warsaw, Poland
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Noori AM, Joshi S, Teodorescu DL, Kwan AC, Luthringer DJ, Ehdaie A. The Sights of Sound: MRI and Histopathological Analysis of a Steam-Pop During Bipolar Ablation. JACC Clin Electrophysiol 2024; 10:790-795. [PMID: 38430091 DOI: 10.1016/j.jacep.2023.12.017] [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: 12/08/2023] [Accepted: 12/15/2023] [Indexed: 03/03/2024]
Affiliation(s)
- Arshia M Noori
- Smidt Heart Institute, Cedars-Sinai Medical Center, Los Angeles, California, USA
| | | | - Debbie L Teodorescu
- Smidt Heart Institute, Cedars-Sinai Medical Center, Los Angeles, California, USA
| | - Alan C Kwan
- Smidt Heart Institute, Cedars-Sinai Medical Center, Los Angeles, California, USA
| | - Daniel J Luthringer
- Department of Pathology and Laboratory Medicine, Cedars-Sinai Medical Center, Los Angeles, California, USA
| | - Ashkan Ehdaie
- Smidt Heart Institute, Cedars-Sinai Medical Center, Los Angeles, California, USA.
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Derejko P, Janus I, Kułakowski P, Kuśnierz J, Baran J, Hangiel U, Proszek J, Frydrychowski P, Michałek M, Noszczyk-Nowak A. Bipolar endo-epicardial RF ablation: Animal feasibility study. Heart Rhythm 2024:S1547-5271(24)00126-7. [PMID: 38336196 DOI: 10.1016/j.hrthm.2024.02.009] [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: 12/04/2023] [Revised: 01/13/2024] [Accepted: 02/05/2024] [Indexed: 02/12/2024]
Abstract
BACKGROUND Bipolar radiofrequency ablation (B-RFA) is a method used to treat the arrhythmia substrate resistant to unipolar ablation. Few studies have addressed endo-epicardial B-RFA. OBJECTIVE The aim of the study was to evaluate chronic lesions resulting from endo-epicardial B-RFA and to determine optimal settings for such procedures in an animal model. METHODS In 7 pigs, up to 5 radiofrequency applications per animal were performed with 2 electrodes placed on both sides of the left ventricular free wall. Current was delivered for 60 seconds by a generator dedicated for B-RFA with power settings of 25, 30, 35, 40, and 50 W. RESULTS At 12 weeks after ablation, 31 lesions were assessed. Their maximal cross-sectional area ranged from 7.2 to 68 mm2 and correlated with total power delivered (r = 0.53), with temperature increment at the endocardial catheter (r = 0.65), and inversely with temperature decrement at the epicardial catheter (r = 0.54). For power values between 30 and 40 W, the lesion area did not differ significantly (P = .92). Lesion depth ranged from 1.9 to 11 mm and correlated with impedance decrement (r = 0.5). Lesions were transmural in 8 cases. Lesion depth/wall thickness ratio was on average 0.6 ± 0.3, with the smallest value for 25 W (0.5 ± 0.3) and the largest for 50 W (0.8 ± 0.3). Steam pops occurred at a power range of 30-50 W, with an incidence of 1 in 5 applications, with 1 case of fatal tamponade at 40 W. Impedance decrement, endocardial catheter temperature increment, and endocardial electrogram amplitude decrement were greater during applications with steam pops. CONCLUSION Chronic lesions resulting from endo-epicardial B-RFA appear smaller and less often transmural compared with acute lesions described in the literature. The incidence of steam pops during endo-epicardial B-RFA is relatively high even at low powers.
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Affiliation(s)
- Paweł Derejko
- Department of Cardiology, Medicover Hospital, Warsaw, Poland; Department of Cardiac Arrhythmias, National Institute of Cardiology, Warsaw, Poland.
| | - Izabela Janus
- Faculty of Veterinary Medicine, University of Environmental and Life Sciences, Wroclaw, Poland
| | - Piotr Kułakowski
- Department of Cardiology, Centre for Postgraduate Medical Education, Grochowski Hospital, Warsaw, Poland
| | - Jacek Kuśnierz
- Department of Cardiology, Medicover Hospital, Warsaw, Poland
| | - Jakub Baran
- Department of Cardiology, Centre for Postgraduate Medical Education, Grochowski Hospital, Warsaw, Poland
| | | | | | - Piotr Frydrychowski
- Faculty of Veterinary Medicine, University of Environmental and Life Sciences, Wroclaw, Poland
| | - Marcin Michałek
- Faculty of Veterinary Medicine, University of Environmental and Life Sciences, Wroclaw, Poland
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Futyma P, Chen S, Enriquez A, Pürerfellner H, Santangeli P. Bipolar ablation of ventricular arrhythmias: Step-by-step. J Cardiovasc Electrophysiol 2023; 34:2599-2606. [PMID: 37968834 DOI: 10.1111/jce.16131] [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: 05/13/2023] [Revised: 10/29/2023] [Accepted: 11/01/2023] [Indexed: 11/17/2023]
Abstract
Radiofrequency (RF) ablation of intramural ventricular arrhythmias (VAs) may require advanced ablation techniques to achieve effective energy transfer to the targeted tissue. As an alternative to standard RF ablation, catheter ablation can also be conducted in bipolar configuration when two ablation catheters participate in the RF circuit. This strategy has proved to result in deeper lesion formation and may be effective for eliminating arrhythmias that have been refractory to standard ablation. In this article, we provide a step-by-step guide on when and how to perform bipolar ablation of VAs.
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Affiliation(s)
- Piotr Futyma
- St. Joseph's Heart Rhythm Center, Rzeszów, Poland
- Medical College, University of Rzeszów, Rzeszów, Poland
| | - Shaojie Chen
- Department Kardiologe, Markus Krankenhaus, Cardioangiologisches Centrum Bethanien, Frankfurt am Main, Germany
| | - Andres Enriquez
- Kingston Health Science Centre, Queen's University, Kingston, Ontario, Canada
| | | | - Pasquale Santangeli
- Section of Cardiac Pacing and Electrophysiology, Heart and Vascular Institute, Cleveland Clinic Foundation, Cleveland, Ohio, USA
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Nayyar S. Intracardiac Electrogram Targets for Ventricular Tachycardia Ablation. Card Electrophysiol Clin 2022; 14:559-570. [PMID: 36396178 DOI: 10.1016/j.ccep.2022.06.001] [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
The pathogenesis of ventricular tachycardia (VT) in most patients with a prior myocardial scarring is reentry involving compartmentalized muscle fibers protected within the scar. Often the 12-lead ECG morphology of the VT itself is not available when treated with a defibrillator. Consequently, VT ablation takes on an interesting challenge of finding critical targets in sinus rhythm. High-density recordings are essential to evaluate a substrate based on whole electrogram voltage and activation delay, supplemented with substrate perturbation through alternate site pacing or introducing an extra stimulation. In this article, we discuss contemporary intracardiac electrogram targets for VT ablation, with explanation on each of their specific fundamental physiology.
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Affiliation(s)
- Sachin Nayyar
- Townsville University Hospital, James Cook University, Townsville, Queensland, Australia.
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Saitoh O, Kasai T, Fuse K, Oikawa A, Furushima H, Chinushi M. Impedance-decline-guide power control long application time bipolar radiofrequency catheter ablation. J Cardiovasc Electrophysiol 2022; 33:2538-2545. [PMID: 36135613 DOI: 10.1111/jce.15684] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/11/2022] [Revised: 09/15/2022] [Accepted: 09/17/2022] [Indexed: 12/15/2022]
Abstract
INTRODUCTION Bipolar (BIP) radiofrequency (RF) ablation creates deep myocardial lesions but ideal energy application modes to treat ventricular arrhythmias originating from deep inside the thick myocardium have not been well established. An experimental study was performed to clarify whether high power and long application time BIP ablation were performable by impedance-decline-guide power control (PC) and whether it could create transmural lesions in the thick ventricle with a minimum risk of steam-pop. METHODS AND RESULTS Perfused porcine ventricle (18.4 ± 2.3 mm) was placed in an experimental bath and BIP ablation (50 W) for 120 s was attempted with catheter contact of 30-g using two protocols; fixed power (FP) and impedance-decline-guide PC. In the latter protocol, BIP ablation was started from 50 W, while the energy was decreased to 40-20 W according to the impedance decline during RF ablation. FP ablation was attempted in 30 applications and the transmural lesion was created in all 30, although steam-pop occurred in 16/30 applications (53%). Low minimum impedance, large total impedance decline (TID), and %-TID were associated with the steam-pop occurrence. PC ablation was attempted in another 21 applications, and the transmural lesion was created in all 21 without steam-pop. PC ablation was superior to FP ablation (21/21 vs. 14/30, p < .001) in the creation of a transmural lesion without resulting in steam-pop. CONCLUSIONS High power and long application time BIP ablation seems to be feasible according to the impedance-decline-guide approach, which could create transmural lesions in thick porcine ventricles with minimal risk of steam-pop.
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Affiliation(s)
- Osamu Saitoh
- Cardiovascular Research of Graduate School of Health Sciences, Niigata University School of Medicine, Niigata, Japan
| | - Takumi Kasai
- Cardiovascular Research of Graduate School of Health Sciences, Niigata University School of Medicine, Niigata, Japan
| | - Kyogo Fuse
- Cardiovascular Research of Graduate School of Health Sciences, Niigata University School of Medicine, Niigata, Japan
| | - Ayaka Oikawa
- Cardiovascular Research of Graduate School of Health Sciences, Niigata University School of Medicine, Niigata, Japan
| | - Hiroshi Furushima
- Cardiovascular Research of Graduate School of Health Sciences, Niigata University School of Medicine, Niigata, Japan
| | - Masaomi Chinushi
- Cardiovascular Research of Graduate School of Health Sciences, Niigata University School of Medicine, Niigata, Japan
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Mathuria N, Royal ALR, Enterría-Rosales J, Carcamo-Bahena Y, Terracciano R, Dave A, Valderrabano M, Filgueira CS. Near-infrared sensitive nanoparticle-mediated photothermal ablation of ventricular myocardium. Heart Rhythm 2022; 19:1550-1556. [PMID: 35562055 DOI: 10.1016/j.hrthm.2022.05.006] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/03/2022] [Revised: 04/20/2022] [Accepted: 05/02/2022] [Indexed: 01/25/2023]
Affiliation(s)
- Nilesh Mathuria
- Houston Methodist Heart and Vascular Center, Houston Methodist Research Institute, Houston Methodist Hospital, Houston, Texas
| | - Amber Lee R Royal
- Department of Nanomedicine, Houston Methodist Research Institute, Houston, Texas
| | - Julia Enterría-Rosales
- Department of Nanomedicine, Houston Methodist Research Institute, Houston, Texas; School of Medicine, Instituto Tecnológico de Monterrey, Monterrey, Mexico
| | | | - Rossana Terracciano
- Department of Nanomedicine, Houston Methodist Research Institute, Houston, Texas; Department of Electronics, Politecnico di Torino, Torino, Italy
| | - Amish Dave
- Houston Methodist Heart and Vascular Center, Houston Methodist Research Institute, Houston Methodist Hospital, Houston, Texas
| | - Miguel Valderrabano
- Houston Methodist Heart and Vascular Center, Houston Methodist Research Institute, Houston Methodist Hospital, Houston, Texas
| | - Carly S Filgueira
- Department of Nanomedicine, Houston Methodist Research Institute, Houston, Texas; Department of Cardiovascular Surgery, Houston Methodist Research Institute, Houston, Texas.
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Stevenson WG, Sapp JL. Newer Methods for VT Ablation and When to Use Them. Can J Cardiol 2021; 38:502-514. [PMID: 34942300 DOI: 10.1016/j.cjca.2021.12.004] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2021] [Revised: 12/03/2021] [Accepted: 12/11/2021] [Indexed: 02/07/2023] Open
Abstract
Radiofrequency (RF) catheter ablation has long been an important therapy for ventricular tachycardia and frequent symptomatic premature ventricular beats and nonsustained arrhythmias when antiarrhythmic drugs fail to suppress the arrhythmias. It is increasingly used in preference to antiarrhythmic drugs, sparing the patient drug adverse effects. Ablation success varies with the underlying heart disease and type of arrhythmia, being very effective for patients without structural heart disease, less in structural heart disease. Failure occurs when a target for ablation cannot be identified, or ablation lesions fail to reach and abolish the arrhythmia substrate that may be extensive, intramural or subepicardial in location. Approaches to improving ablation lesion creation are modifications to RF ablation and emerging investigational techniques. Easily implemented modifications to RF methods include manipulating the size and location of the cutaneous dispersive electrode, increasing RF delivery duration, and use of lower tonicity catheter irrigation (usually 0.45% saline). When catheters can be placed on either side of culprit substrate RF can be delivered in a bipolar or simultaneous unipolar configuration that can be successful. Catheters with extendable/retractable irrigated needles for RF delivery are under investigation in clinical trials. Cryoablation is potentially useful in specific situations when maintaining contact is difficult. Transvascular ethanol ablation and stereotactic radioablation have both shown promise for arrhythmias that fail other ablation strategies. Although substantial clinical progress has been achieved, further improvement is clearly needed. With ability to increase ablation lesion size, continued careful evaluation of safety, which has been excellent for standard RF ablation, remains important.
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Affiliation(s)
- William G Stevenson
- The Cardiovascular Division, Department of Medicine, Vanderbilt University Medical Center, Nashville, Tennessee; The Heart Rhythm Service, Department of Medicine, Division of Cardiology, QEII Health Sciences Centre, Halifax, Nova Scotia, Canada.
| | - John L Sapp
- The Cardiovascular Division, Department of Medicine, Vanderbilt University Medical Center, Nashville, Tennessee; The Heart Rhythm Service, Department of Medicine, Division of Cardiology, QEII Health Sciences Centre, Halifax, Nova Scotia, Canada
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