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Okada JI, Washio T, Sugiura S, Hisada T. Transition mechanisms from atrial flutter to atrial fibrillation during anti-tachycardia pacing therapy. Pacing Clin Electrophysiol 2023; 46:1509-1518. [PMID: 37922381 DOI: 10.1111/pace.14863] [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: 07/31/2023] [Revised: 10/11/2023] [Accepted: 10/17/2023] [Indexed: 11/05/2023]
Abstract
BACKGROUND Atrial anti-tachycardia pacing (aATP) has been shown to be effective for the termination of atrial tachyarrhythmias, but its success rate is still not high enough. OBJECTIVE The main objective of this study was to investigate the mechanisms of atrial flutter (AFL) termination by aATP and the transition from AFL to atrial fibrillation (AF) during aATP. METHODS We developed a multi-scale model of the human atrium based on magnetic resonance images and examined the atrial electrophysiology of AFL during aATP with a ramp protocol. RESULTS In successful cases of aATP, paced excitation entered the excitable gap and collided with the leading edge of the reentrant wave front. Furthermore, the excitation propagating in the opposite direction collided with the trailing edge of the reentrant wave to terminate AFL. The second collision was made possible by the distribution of the wave propagation velocity in the atria. The detailed analysis revealed that the slowing of propagation velocity occurred at the exit of the sub-Eustachian isthmus, probably due to source-sink mismatch. During the transition from AFL to AF, the excitation collided with the refractory zone of the preceding wave and broke into multiple wave fronts to induce AF. A similar observation was made for the transition from AF to sinus rhythm. In both cases, the complex anatomy of the atria played an essential role. CONCLUSION The complex anatomy of atria plays an essential role in the maintenance of stable AFL and its termination by aATP, which were revealed by the realistic three-dimensional simulation model.
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Affiliation(s)
- Jun-Ichi Okada
- UT-Heart Inc., Setagaya-ku, Tokyo, Japan
- Graduate School of Frontier Sciences, University of Tokyo, Kashiwa, Chiba, Japan
| | - Takumi Washio
- UT-Heart Inc., Setagaya-ku, Tokyo, Japan
- Graduate School of Frontier Sciences, University of Tokyo, Kashiwa, Chiba, Japan
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2
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Leonelli FM, Ponti RD, Bagliani G. Interpretation of Typical and Atypical Atrial Flutters by Precision Electrocardiology Based on Intracardiac Recording. Card Electrophysiol Clin 2022; 14:435-458. [PMID: 36153125 DOI: 10.1016/j.ccep.2022.05.004] [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
Atrial flutter is a term encompassing multiple clinical entities. Clinical manifestations of these arrhythmias range from typical isthmus-dependent flutter to post-ablation microreentries. Twelve-lead electrocardiogram (ECG) is a diagnostic tool in typical flutter, but it is often unable to clearly localize atrial flutters maintained by more complex reentrant circuits. Electrophysiology study and mapping are able to characterize in fine details all the components of the circuit and determine their electrophysiological properties. Combining these 2 techniques can greatly help in understanding the vectors determining the ECG morphology of the flutter waveforms, increasing the diagnostic usefulness of this tool.
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Affiliation(s)
- Fabio M Leonelli
- Cardiology Department, James A. Haley Veterans' Hospital, University of South Florida, 13000 Bruce B Down Boulevard, Tampa, FL 33612, USA; University of South Florida FL 4202 E Fowler Avenue, Tampa, FL 33620, USA.
| | - Roberto De Ponti
- Department of Heart and Vessels, Ospedale di Circolo, Viale Borri, 57, Varese 21100, Italy; Department of Medicine and Surgery, University of Insubria, Viale Guicciardini, 9, Varese 21100, Italy
| | - Giuseppe Bagliani
- Cardiology And Arrhythmology Clinic, University Hospital "Ospedali Riuniti", Via Conca 71, Ancona 60126, Italy; Department of Biomedical Sciences and Public Health, Marche Polytechnic University, Via Conca 71, Ancona 60126, Italy
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3
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Ho SY. Normal and Abnormal Atrial Anatomy Relevant to Atrial Flutters: Areas of Physiological and Acquired Conduction Blocks and Delays Predisposing to Re-entry. Card Electrophysiol Clin 2022; 14:375-384. [PMID: 36153120 DOI: 10.1016/j.ccep.2022.03.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
This article reviews the structure of the atrial chambers to consider the anatomic bases for obstacles and barriers in atrial flutter. In particular, the complex myocardial arrangement and composition of the cavotricuspid isthmus could account for a slow zone of conduction. Prominent muscle bundles within the atria and interatrial, and myoarchitecture of the walls, could contribute to preferential conduction pathways. Alterations from tissue damage as part of aging, or from surgical interventions could lead to re-entry.
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Affiliation(s)
- S Yen Ho
- Royal Brompton Hospital, Imperial College London, Sydney Street, London SW3 6NP, United Kingdom.
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Valeri Y, Bagliani G, Compagnucci P, Volpato G, Cipolletta L, Parisi Q, Misiani A, Fogante M, Molini S, Dello Russo A, Casella M. Pathophysiology of Typical Atrial Flutter. Card Electrophysiol Clin 2022; 14:401-409. [PMID: 36153122 DOI: 10.1016/j.ccep.2022.05.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Nowadays, the pathophysiology mechanism of initiation and maintenance of reentrant arrhythmias, including atrial flutter, is well characterized. However, the anatomic and functional elements of the macro reentrant arrhythmias are not always well defined. In this article, we illustrate the anatomic structures that delineate the typical atrial flutter circuit, both clockwise and counterclockwise, paying attention to the inferior vena cava-tricuspid isthmus (CTI) and crista terminalis crucial role. Finally, we describe the left atrial role during typical atrial flutter, electrophysiologically a by-stander but essential in the phenotypic electrocardiogram (ECG).
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Affiliation(s)
- Yari Valeri
- Cardiology and Arrhythmology Clinic, University Hospital "Ospedali Riuniti", Via Conca 71, Ancona 60126, Italy; Department of Biomedical Sciences and Public Health, Marche Polytechnic University, Ancona, Italy.
| | - Giuseppe Bagliani
- Cardiology and Arrhythmology Clinic, University Hospital "Ospedali Riuniti", Via Conca 71, Ancona 60126, Italy; Department of Biomedical Sciences and Public Health, Marche Polytechnic University, Ancona, Italy
| | - Paolo Compagnucci
- Cardiology and Arrhythmology Clinic, University Hospital "Ospedali Riuniti", Via Conca 71, Ancona 60126, Italy; Department of Biomedical Sciences and Public Health, Marche Polytechnic University, Ancona, Italy
| | - Giovanni Volpato
- Cardiology and Arrhythmology Clinic, University Hospital "Ospedali Riuniti", Via Conca 71, Ancona 60126, Italy; Department of Biomedical Sciences and Public Health, Marche Polytechnic University, Ancona, Italy
| | - Laura Cipolletta
- Cardiology and Arrhythmology Clinic, University Hospital "Ospedali Riuniti", Via Conca 71, Ancona 60126, Italy
| | - Quintino Parisi
- Cardiology and Arrhythmology Clinic, University Hospital "Ospedali Riuniti", Via Conca 71, Ancona 60126, Italy
| | - Agostino Misiani
- Cardiology and Arrhythmology Clinic, University Hospital "Ospedali Riuniti", Via Conca 71, Ancona 60126, Italy
| | - Marco Fogante
- Cardiology and Arrhythmology Clinic, University Hospital "Ospedali Riuniti", Via Conca 71, Ancona 60126, Italy; Department of Clinical, Special and Dental Sciences, Marche Polytechnic University, Ancona, Italy
| | - Silvano Molini
- Cardiology and Arrhythmology Clinic, University Hospital "Ospedali Riuniti", Via Conca 71, Ancona 60126, Italy
| | - Antonio Dello Russo
- Cardiology and Arrhythmology Clinic, University Hospital "Ospedali Riuniti", Via Conca 71, Ancona 60126, Italy; Department of Biomedical Sciences and Public Health, Marche Polytechnic University, Ancona, Italy
| | - Michela Casella
- Cardiology and Arrhythmology Clinic, University Hospital "Ospedali Riuniti", Via Conca 71, Ancona 60126, Italy; Department of Clinical, Special and Dental Sciences, Marche Polytechnic University, Ancona, Italy
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5
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Ultra-high resolution mapping of reverse typical atrial flutter: electrophysiological properties of a right atrial posterior wall and interatrial septum activation pattern. J Interv Card Electrophysiol 2021; 63:333-339. [PMID: 33963960 DOI: 10.1007/s10840-021-01003-0] [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: 02/28/2021] [Accepted: 04/27/2021] [Indexed: 10/21/2022]
Abstract
PURPOSE We aimed to elucidate the right atrial posterior wall (RAPW) and interatrial septum (IAS) conduction pattern during reverse typical atrial flutter (clockwise AFL: CW-AFL). METHODS This study included 30 patients who underwent catheter ablation of CW-AFL (n = 11) and counter-clockwise AFL (CCW-AFL; n = 19) using an ultra-high resolution mapping system. RAPW transverse conduction block was evaluated by the conduction pattern on propagation maps and double potentials separated by an isoelectric line. The degree of blockade was evaluated by the %blockade, which was calculated by the length of the blocked area divided by the RAPW length. IAS activation patterns were also investigated dependent on the propagation map. RESULTS The average %blockade of the RAPW was significantly smaller in patients with CW-AFL than those with CCW-AFL (25 [3-74]% vs. 67 [57-75]%, p < 0.05). CW-AFL patients exhibited 3 different RAPW conduction patterns: (1) a complete blockade pattern (3 patients), (2) moderate (> 25% blockade) blockade pattern (2 patients), and (3) little (< 25% blockade) blockade pattern (6 patients). In contrast, the little blockade pattern was not observed in CCW-AFL patients. Of 11 CW-AFL patients, 4, including all patients with an RAPW complete blockade pattern, had an IAS activation from the wavefront from the anterior tricuspid annulus (TA), and 6 had an IAS activation from the wavefronts from both the anterior TA and RAPW. One patient had IAS activation dominantly from the wavefront from the RAPW. CONCLUSIONS RAPW transverse conduction blockade during CW-AFL was less frequent than during CCW-AFL, which possibly caused various IAS activation patterns.
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Sekihara T, Miyazaki S, Nagao M, Kakehashi S, Mukai M, Aoyama D, Nodera M, Eguchi T, Hasegawa K, Uzui H, Tada H. Ultrahigh resolution electroanatomical mapping of the transverse conduction of the right atrial posterior wall in cases with and without typical atrial flutter. J Cardiovasc Electrophysiol 2020; 32:297-304. [PMID: 33355964 DOI: 10.1111/jce.14850] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/15/2020] [Revised: 12/02/2020] [Accepted: 12/15/2020] [Indexed: 11/30/2022]
Abstract
INTRODUCTION The right atrial posterior wall (RAPW) is known to form a conduction barrier during typical atrial flutter (AFL). We evaluated the transverse conduction properties of RAPW in patients with and without typical AFL using an ultrahigh resolution electroanatomical mapping system. METHODS AND RESULTS This study included 41 patients who underwent catheter ablation of AF, typical or atypical AFL, in whom we performed RAPW mapping with an ultrahigh resolution mapping system during typical AFL and coronary sinus ostial pacing with three different pacing cycle lengths (PCLs) (1) PCL1: PCL within 40 ms of the AFL cycle length in patients with typical AFL or 250-300 ms for those without, (2) PCL2: 400 ms, (3) PCL3: PCL just faster than the sinus rate. Local RAPW conduction block was evaluated by propagation mapping and local double potentials separated by an isoelectric line. The functional block was defined as areas blocked during shorter PCLs but conductive during longer PCLs. The degree of blockade was calculated by dividing the blocked length by RAPW length (%blockade). Only two patients demonstrated a fixed complete RAPW block (100%, %blockade). Thirty-one patients demonstrated a partial block of RAPW, and the %blockade during PCL1-3 was 49.4 ± 19.8%, 39.5 ± 19.2%, and 35.0 ± 22.9% in this group, respectively. Functional block areas were frequently observed above the fixed block area adjacent to the RA-inferior vena cava junction. Transverse conduction block was more frequently observed in patients with typical AFL at any longitudinal level of RAPW. CONCLUSION RAPW transverse conduction block is lower-side dominant and greater in patients with typical AFL than those without.
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Affiliation(s)
- Takayuki Sekihara
- Department of Cardiovascular Medicine, Faculty of Medical Sciences, University of Fukui, Fukui, Japan
| | - Shinsuke Miyazaki
- Department of Cardiovascular Medicine, Faculty of Medical Sciences, University of Fukui, Fukui, Japan
| | - Moeko Nagao
- Department of Cardiovascular Medicine, Faculty of Medical Sciences, University of Fukui, Fukui, Japan
| | - Shota Kakehashi
- Department of Cardiovascular Medicine, Faculty of Medical Sciences, University of Fukui, Fukui, Japan
| | - Moe Mukai
- Department of Cardiovascular Medicine, Faculty of Medical Sciences, University of Fukui, Fukui, Japan
| | - Daisetsu Aoyama
- Department of Cardiovascular Medicine, Faculty of Medical Sciences, University of Fukui, Fukui, Japan
| | - Minoru Nodera
- Department of Cardiovascular Medicine, Faculty of Medical Sciences, University of Fukui, Fukui, Japan
| | - Tomoya Eguchi
- Department of Cardiovascular Medicine, Faculty of Medical Sciences, University of Fukui, Fukui, Japan
| | - Kanae Hasegawa
- Department of Cardiovascular Medicine, Faculty of Medical Sciences, University of Fukui, Fukui, Japan
| | - Hiroyasu Uzui
- Department of Cardiovascular Medicine, Faculty of Medical Sciences, University of Fukui, Fukui, Japan
| | - Hiroshi Tada
- Department of Cardiovascular Medicine, Faculty of Medical Sciences, University of Fukui, Fukui, Japan
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7
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Potapova KV, Nosov VP, Koroleva LY, Amineva NV. [Atrial Flutter: up-to-date Problem Evaluation with Clinical Positions]. ACTA ACUST UNITED AC 2020; 60:70-80. [PMID: 32245357 DOI: 10.18087/cardio.2020.1.n693] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2019] [Accepted: 10/29/2019] [Indexed: 11/18/2022]
Abstract
The review provides current ideas about the etiology and prevalence of atrial flutter (AF), mechanism and substrate of arrhythmogenesis, and principles of clinical and electrophysiological classification of this arrhythmia. Methods for conservative and surgical treatments of AF, including their comparative aspect, are described in detail. The review presented recent data on efficacy and potential risks of different approaches to reversing the arrhythmia. The authors indicated a need for early diagnosis and strict control of the sinus rhythm in AF, which would help a successful intervention not only to completely cure the existing arrhythmia but also to prevent other heart rhythm disorders, primarily atrial fibrillation.
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Affiliation(s)
| | - V P Nosov
- Privolzhsky Research Medical University
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8
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Riad FS, Waldo AL. Revisiting an Underrecognized Strategy for Rhythm Management: Hybrid Therapy for Patients who Convert from Atrial Fibrillation to Flutter on Antiarrhythmic Drugs. J Innov Card Rhythm Manag 2019; 10:3842-3847. [PMID: 32477703 PMCID: PMC7252707 DOI: 10.19102/icrm.2019.101005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2018] [Accepted: 02/11/2019] [Indexed: 11/25/2022] Open
Abstract
Atrial fibrillation (AF) is often treated with antiarrhythmic drugs (AADs) or catheter ablation. In a unique subset of patients, AF can convert to atrial flutter (AFL) after the initiation of an AAD. It has previously been shown that, in this subset of patients, cavotricuspid isthmus (CTI) ablation followed by the continuation of the AAD regimen has an unusually high rate of successfully maintaining sinus rhythm. This is an underrecognized approach toward rhythm management in such patients. However, the reason(s) for such a high degree of efficacy with this hybrid therapeutic approach are unclear. We suggest that conversion from AF to AFL selects for a group of patients in whom AF is particularly responsive to the effects of the AAD. Since CTI ablation is essentially curative of AFL, the combination of both techniques results in a high efficacy of sinus rhythm maintenance. Further investigation is required to confirm these hypotheses.
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Affiliation(s)
- Fady S Riad
- Division of Cardiovascular Medicine, University Hospitals Cleveland Medical Center, Cleveland, OH, USA
| | - Albert L Waldo
- Division of Cardiovascular Medicine, University Hospitals Cleveland Medical Center, Cleveland, OH, USA
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9
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Höltgen R, Sommer P. [Conventional and electroanatomical mapping-a pivotal diagnostic tool to provide a basis for ablative therapy of complex atrial and ventricular arrhythmias]. Herzschrittmacherther Elektrophysiol 2018; 29:239-243. [PMID: 30229389 DOI: 10.1007/s00399-018-0590-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Affiliation(s)
- Reinhard Höltgen
- I. Medizinische Klinik - Kardiologie/Elektrophysiologie, St. Agnes Hospital Bocholt - Klinikum Westmünsterland, Barloer Weg 125, 46397, Bocholt, Deutschland.
| | - Philipp Sommer
- AG 1 (Rhythmologie) der DGK und Abteilung für Rhythmologie, Klinik für Kardiologie, Helios-Stiftungsprofessur, Herzzentrum Leipzig, Leipzig, Deutschland.
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10
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New Insights Into an Old Arrhythmia. JACC Clin Electrophysiol 2017; 3:971-986. [DOI: 10.1016/j.jacep.2017.01.019] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2016] [Revised: 01/04/2017] [Accepted: 01/04/2017] [Indexed: 11/19/2022]
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Teuwen CP, Ramdjan TTTK, de Groot NMS. Management of atrial fibrillation in patients with congenital heart defects. Expert Rev Cardiovasc Ther 2014; 13:57-66. [PMID: 25494876 DOI: 10.1586/14779072.2015.986467] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Due to improved surgical technologies and post-operative care, long-term survival has improved in patients with congenital heart disease. Atrial fibrillation (AF) is increasingly observed in this aging population and is associated with morbidity and mortality; however, reports about the pathophysiology and the outcome of different treatment modalities of AF are still scarce in patients with congenital heart disease. In this review, the authors describe the epidemiology, pathophysiology and outcome of the different therapies of AF in this specific patient population.
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Affiliation(s)
- Christophe P Teuwen
- Department of Cardiology, Unit Translational Electrophysiology, Erasmus Medical Center, Ba-579, 's Gravendijkwal 230, 3015 CE Rotterdam, The Netherlands
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Walters TE, Kalman JM. Development of atrial fibrillation after atrial flutter ablation: more a question of when than whether. J Cardiovasc Electrophysiol 2014; 25:821-823. [PMID: 24762080 DOI: 10.1111/jce.12446] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- Tomos E Walters
- Department of Cardiology, The Royal Melbourne Hospital, Melbourne, Australia.,Department of Medicine, The University of Melbourne, Melbourne, Australia
| | - Jonathan M Kalman
- Department of Cardiology, The Royal Melbourne Hospital, Melbourne, Australia.,Department of Medicine, The University of Melbourne, Melbourne, Australia
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13
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Chen WT, Lo LW, Lin YJ, Chen SA. Sawtooth electrocardiographic pattern with blocked cavotricuspid isthmus. Circ J 2013; 78:262-3. [PMID: 24096728 DOI: 10.1253/circj.cj-13-0852] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Wei-Ta Chen
- Division of Cardiovascular Medicine, Department of Internal Medicine, Wan Fang Hospital, Taipei Medical University
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YANG BING, JU WEIZHU, CHEN HONGWU, ZHANG FENGXIANG, CHEN KAI, GU KAI, CAO KEJIANG, CHEN MINGLONG. Comparison of the Location of Slow Conduction Velocity in Cavotricuspid-Dependent Atrial Flutter in Patients With and Without Prior Atriotomy: Different Arrhythmogenic Basis and Clinical Implications for Placement of Atriotomy. J Cardiovasc Electrophysiol 2012; 23:988-95. [DOI: 10.1111/j.1540-8167.2012.02348.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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15
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Walters TE, Kistler PM, Kalman JM. Radiofrequency Ablation for Atrial Tachycardia and Atrial Flutter. Heart Lung Circ 2012; 21:386-94. [DOI: 10.1016/j.hlc.2012.02.001] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2011] [Accepted: 02/04/2012] [Indexed: 11/16/2022]
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TAKAMI MITSURU, YOSHIDA AKIHIRO, FUKUZAWA KOJI, TAKEI ASUMI, KANDA GAKU, TAKAMI KAORU, KUMAGAI HIROYUKI, TANAKA SATOKO, ITOH MITSUAKI, IMAMURA KIMITAKE, FUJIWARA RYUDO, SUZUKI ATSUSHI, HIRATA KENICHI. Rate-Dependent and Site-Specific Conduction Block at the Posterior Right Atrium and Drug Effects Evaluated Using a Noncontact Mapping System in Patients with Typical Atrial Flutter. J Cardiovasc Electrophysiol 2012; 23:827-34. [DOI: 10.1111/j.1540-8167.2012.02313.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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17
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Dimitri H, Ng M, Brooks AG, Kuklik P, Stiles MK, Lau DH, Antic N, Thornton A, Saint DA, McEvoy D, Antic R, Kalman JM, Sanders P. Atrial remodeling in obstructive sleep apnea: implications for atrial fibrillation. Heart Rhythm 2011; 9:321-7. [PMID: 22016075 DOI: 10.1016/j.hrthm.2011.10.017] [Citation(s) in RCA: 233] [Impact Index Per Article: 17.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/31/2011] [Accepted: 10/11/2011] [Indexed: 11/25/2022]
Abstract
BACKGROUND There is a known association between obstructive sleep apnea (OSA) and atrial fibrillation (AF); however, how OSA affects the atrial myocardium is not well described. OBJECTIVE To determine whether patients with OSA have an abnormal atrial substrate. METHODS Forty patients undergoing ablation of paroxysmal AF and in sinus rhythm (20 with OSA [apnea-hypopnea index ≥ 15] and 20 reference patients with no OSA [apnea-hypopnea index < 15] by polysomnography) were studied. Multipolar catheters were positioned at the lateral right atrium (RA), coronary sinus, crista terminalis, and RA septum to determine the effective refractory period at 5 sites, conduction time along linear catheters at the RA and the coronary sinus, conduction at the crista terminalis, and sinus node function (corrected sinus node recovery time). Biatrial electroanatomic maps were created to determine the voltage, conduction, and distribution of complex electrograms (duration ≥ 50 ms). RESULTS The groups had no differences in the prevalence of established risk factors for AF. Patients with OSA had the following compared with those without OSA: no difference in effective refractory period (P = .9), prolonged conduction times along the coronary sinus and RA (P = .02), greater number (P = .003) and duration (P = .03) of complex electrograms along the crista terminalis, longer P-wave duration (P = .01), longer corrected sinus node recovery time (P = .02), lower atrial voltage (RA, P <.001; left atrium, P <.001), slower atrial conduction velocity (RA, P = .001; left atrium, P = .02), and more widespread complex electrograms in both atria (RA, P = .02; left atrium, P = .01). CONCLUSION OSA is associated with significant atrial remodeling characterized by atrial enlargement, reduction in voltage, site-specific and widespread conduction abnormalities, and longer sinus node recovery. These features may in part explain the association between OSA and AF.
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Affiliation(s)
- Hany Dimitri
- Centre for Heart Rhythm Disorders (CHRD), Discipline of Medicine, University of Adelaide, Adelaide, Australia
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Sharma A, Wong D, Weidlich G, Fogarty T, Jack A, Sumanaweera T, Maguire P. Noninvasive stereotactic radiosurgery (CyberHeart) for creation of ablation lesions in the atrium. Heart Rhythm 2010; 7:802-10. [DOI: 10.1016/j.hrthm.2010.02.010] [Citation(s) in RCA: 122] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/08/2009] [Accepted: 02/05/2010] [Indexed: 11/29/2022]
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19
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Marcus GM. Multiple Interrelated Right Atrial Flutters. Card Electrophysiol Clin 2010; 2:291-294. [PMID: 28770767 DOI: 10.1016/j.ccep.2010.01.023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
An 82-year-old man had a 12-lead electrocardiogram demonstrating atrial flutter consistent with a typical cavotricuspid isthmus-dependent circuit. During electrophysiology study, he exhibited four different atrial flutters, all thought to be interrelated. This case is discussed.
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Affiliation(s)
- Gregory M Marcus
- Division of Cardiology, Electrophysiology Section, University of California, 500 Parnassus, MUE 434, San Francisco, CA 94143-1354, USA
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20
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Santilli RA, Perego M, Perini A, Carli A, Moretti P, Spadacini G. Radiofrequency catheter ablation of cavo-tricuspid isthmus as treatment of atrial flutter in two dogs. J Vet Cardiol 2010; 12:59-66. [DOI: 10.1016/j.jvc.2009.10.002] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2009] [Revised: 10/23/2009] [Accepted: 10/23/2009] [Indexed: 11/25/2022]
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Campagnucci VP, Rocha Pinto AM, Neto AS, Catani LH, Passarelli MLB, Gandra SMA, Rivetti LA. Seven Years' Outcome of Simultaneous Surgical Treatment of Atrial Septal Defect and Atrial Flutter in 2 Children: Case Reports. Heart Surg Forum 2010; 13:E105-7. [DOI: 10.1532/hsf98.20091153] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Watanabe I. Electro-Anatomical Characteristics of Typical Atrial Flutter. J Arrhythm 2010. [DOI: 10.1016/s1880-4276(10)80002-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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Morita N, Kobayashi Y, Horie T, Iwasaki YK, Hayashi M, Miyauchi Y, Atarashi H, Katoh T, Mizuno K. The undetermined geometrical factors contributing to the transverse conduction block of the crista terminalis. PACING AND CLINICAL ELECTROPHYSIOLOGY: PACE 2009; 32:868-78. [PMID: 19572862 DOI: 10.1111/j.1540-8159.2009.02402.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
BACKGROUND The crista terminalis (CT) is known to be a functional barrier during typical atrial flutter (AFL). The relationship between the CT structural characteristics and its transverse conduction block, however, has not been understood well. METHODS This study consisted of AFL (group 1, N = 15) and non-AFL patients (group 2, N = 13). The CT structural characteristics were determined with intracardiac echocardiography. A 20-pole electrode catheter was located along the CT and pacing at progressively faster rates from either low anterolateral right atrium (LRA) or coronary sinus (CS) was applied. RESULTS The CT height, width, and area were significantly greater in group 1 than in group 2 (P < 0.001). In both groups, at the longest pacing cycle length during CS pacing resulting in CT transverse conduction block at some levels, the width and area were significantly greater at the levels with block than at those without block. During LRA pacing, the area was also significantly larger at the levels with block than at those without in group 1, but not in group 2. The slope angle of CT ridge was significantly steeper at the levels with block than at those without in both groups (P < 0.01), but that was not the case with CS pacing. CT arborization in its inferior portion was more frequently documented in group 1 than group 2 (P < 0.05). CONCLUSIONS The CT structural characteristics that may influence its transverse conduction differ between LRA and CS pacing. Steep slope and arborization of the CT are implicated as a geometric factor in its transverse conduction block.
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Affiliation(s)
- Norishige Morita
- Division of Cardiology, Department of Medicine, Nippon Medical School, Tokyo, Japan.
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Abstract
Typical atrial flutter (AFL) is a common atrial arrhythmia that may cause significant symptoms and serious adverse effects including embolic stroke, myocardial ischemia and infarction, and rarely a tachycardia-induced cardiomyopathy as a result of rapid atrioventricular conduction. As a result of the well-defined anatomic and electrophysiological substrate, and the relative pharmacologic resistance of typical AFL, radiofrequency catheter ablation has emerged in the past decade as a safe and effective first-line treatment. This article reviews the electrophysiology of typical AFL and the techniques currently used for its diagnosis and management.
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Affiliation(s)
- Navinder S Sawhney
- Cardiac Electrophysiology Program, Division of Cardiology, University of California San Diego Medical Center, 4169 Front Street, San Diego, CA 92103-8648, USA
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SCHNEIDER MICHAELAE, NEUSER HANS, KOLLER MARCUSL, SCHUMACHER BURGHARD. Automatic Magnetic-Guided Electroanatomical Mapping and Remote-Controlled Ablation of Atypical and Typical Atrial Flutter. Pacing Clin Electrophysiol 2008; 31:1355-7. [DOI: 10.1111/j.1540-8159.2008.01191.x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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MORITA NORISHIGE, KOBAYASHI YOSHINORI, IWASAKI YUKI, HAYASHI MEISO, MIYAUCHI YASUSHI, ATARASHI HIROTSUGU, TANAKA KEIJI, KATOH TAKAO, MIZUNO KYOICHI. Characterization of Transient Atrial Rhythm Occurring between Typical Atrial Flutter and Its Termination with Class III Drugs. PACING AND CLINICAL ELECTROPHYSIOLOGY: PACE 2008; 31:943-54. [DOI: 10.1111/j.1540-8159.2008.01120.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Waldo AL, Feld GK. Inter-Relationships of Atrial Fibrillation and Atrial Flutter. J Am Coll Cardiol 2008; 51:779-86. [DOI: 10.1016/j.jacc.2007.08.066] [Citation(s) in RCA: 129] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/02/2007] [Revised: 08/07/2007] [Accepted: 08/09/2007] [Indexed: 10/22/2022]
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Roberts-Thomson KC, Stevenson IH, Kistler PM, Haqqani HM, Goldblatt JC, Sanders P, Kalman JM. Anatomically Determined Functional Conduction Delay in the Posterior Left Atrium. J Am Coll Cardiol 2008; 51:856-62. [DOI: 10.1016/j.jacc.2007.11.037] [Citation(s) in RCA: 72] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/18/2007] [Revised: 10/29/2007] [Accepted: 11/08/2007] [Indexed: 11/29/2022]
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Abstract
Can "past decade" be rephrased to refer to more specific years? Typical atrial flutter (AFL) is a common atrial arrhythmia that may cause significant symptoms and serious adverse effects, including embolic stroke, myocardial ischemia and infarction, and, rarely, a tachycardia-induced cardiomyopathy resulting from rapid atrioventricular conduction. As a result of the well-defined anatomic and electrophysiologic substrate and the relative pharmacologic resistance of typical AFL, radiofrequency catheter ablation has emerged since its first description in 1992 as a safe and effective first-line treatment. This article reviews the electrophysiology of typical AFL and techniques currently used for its diagnosis and management.
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Affiliation(s)
- Navinder S Sawhney
- Clinical Cardiac Electrophysiology Program, Division of Cardiology, University of California Medical Center, 4169 Front Street, San Diego, CA 92103, USA
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Morita N, Tanaka K, Yodogawa K, Hayashi M, Akutsu K, Yamamoto T, Satoh N, Kobayashi Y, Katoh T, Takano T. Effect of nifekalant for acute conversion of atrial flutter: the possible termination mechanism of typical atrial flutter. PACING AND CLINICAL ELECTROPHYSIOLOGY: PACE 2007; 30:1242-53. [PMID: 17897127 DOI: 10.1111/j.1540-8159.2007.00846.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
BACKGROUND Nifekalant is a class III antiarrhythmic drug, which is usually used for suppression of ventricular tachycardia (VT) and fibrillation. We studied the efficacy of nifekalant for acute conversion of atrial flutter (AFL) in a prospective, open label study in the intensive care unit (ICU) of cardiovascular medicine. METHODS This study consisted of 31 patients. Twenty-six patients (84%) suffered from structural heart diseases. AFL was developed in 15 patients (48%) while on antiarrhythmic therapy with class IA or IC drugs (I-AFL group) for suppressing atrial fibrillation (AF) and in the remaining patients without such drugs (S-AFL group). Patients with prolonged QT interval, hypokalemia were excluded. All patients received one dose of 0.3 mg/kg of nifekalant over 10 minutes under continuous ambulatory monitoring. Four patients with common AFL in each group received nifekalant during electrophysiologic (EP) study. RESULTS Nifekalant had an overall AFL conversion efficacy of 77.4% within 60 minutes. Eleven patients in S-AFL group (68.8%) and 13 patients in I-AFL group (86.7%) could be converted with mean conversion times of 10.8 +/- 6.2 and 15.0 +/- 8.0 minutes, respectively (n.s.). Conversion rate was significantly higher in patients with a short duration of arrhythmia. The two modes of AFL termination were mainly demonstrated and the preferential mode significantly differed between the two groups. One patient in each group with excessive QT prolongation (6.5%) developed torsade de pointes (TdP), requiring electrical shock in one patient (3.3%). CONCLUSIONS Nifekalant can be used for conversion of AFL with a potent efficacy even in patients with structural heart diseases. However, caution should be required for developing TdP.
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Affiliation(s)
- Norishige Morita
- Intensive and Coronary Care Unit, Nippon Medical School, Tokyo, Japan.
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Yamabe H, Tanaka Y, Morihisa K, Uemura T, Kawano H, Nagayoshi Y, Kojima S, Ogawa H. Tachycardia circuit in typical atrial flutter: the role of a posterolateral line of block in the perpetuation of the tachycardia. PACING AND CLINICAL ELECTROPHYSIOLOGY: PACE 2007; 30:333-42. [PMID: 17367352 DOI: 10.1111/j.1540-8159.2007.00673.x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
BACKGROUND The essential boundaries in typical atrial flutter (AF) are unknown. METHODS To examine the role of the tricuspid annulus (TA) and posterolateral line of block (LB) in maintaining AF, single extrastimuli were delivered during AF both around the LB and the TA in 29 patients. Single extrastimuli were delivered from the superior, middle, and inferior third of the anterior LB, superior, middle, and inferior third of the posterior LB, and the superior, lateral, inferior, and septal portions of the TA. The longest coupling interval (LCI) of single extrastimuli that reset AF and subsequent return cycle (RC) were analyzed. RESULTS The resetting response showed two patterns (groups 1 and 2). The differences between the AF cycle length (AFCL) and the LCI (AFCL-LCI) at the superior, lateral, inferior, and septal portions of the TA were the shortest, and were significantly shorter than those at the other sites (P < 0.0001) in group 1. However, the AFCL-LCI at the superior, middle, and inferior third of the anterior LB, and the superior, lateral, inferior, and septal portions of the TA were the shortest, and were significantly shorter than those at the other sites (P < 0.0001) in group 2. The difference between the RC and the AFCL exhibited the same two patterns, similar to the AFCL-LCI. In group 1, a single extrastimulus produced an artificial conduction across the LB, but AF was not reset. CONCLUSIONS Two types of reentry circuits exist in AF; one has its essential reentry circuit confined to the TA and thus the LB acts as a bystander, while the LB and the TA are essential boundaries in the other one.
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Affiliation(s)
- Hiroshige Yamabe
- Department of Cardiovascular Medicine, Graduate School of Medical Sciences, Kumamoto University, Kumamoto, Japan
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Okumura Y, Watanabe I, Ashino S, Kofune M, Yamada T, Takagi Y, Kawauchi K, Okubo K, Hashimoto K, Shindo A, Sugimura H, Nakai T, Saito S. Anatomical characteristics of the cavotricuspid isthmus in patients with and without typical atrial flutter: Analysis with two- and three-dimensional intracardiac echocardiography. J Interv Card Electrophysiol 2007; 17:11-9. [PMID: 17253121 DOI: 10.1007/s10840-006-9054-0] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/24/2006] [Accepted: 10/20/2006] [Indexed: 11/24/2022]
Abstract
INTRODUCTION The cavotricuspid isthmus (CTI) is crucial in the ablation of typical atrial flutter (AFL), and consequently the CTI anatomy and/or its relation to resistant ablation cases have been widely described in human angiographic studies. Intracardiac echocardiography (ICE) has been shown to be a useful tool for determining detailed anatomical information. Thus, this technology may also allow the visualization of the anatomical characteristics of the CTI, providing an opportunity to further understand the anatomy. AIM We conducted a study to compare the anatomy of the CTI between the patients with and without AFL and to characterize the anatomy of the CTI in the patients with AFL resistant to ablation. MATERIALS AND METHODS Twelve patients with typical AFL and 20 without AFL were enrolled in the study. Two-dimensional (2D) intracardiac echocardiography (ICE) was performed. The recordings were obtained with a 9F, 9-MHz ICE catheter from the right ventricular outflow tract to the inferior vena cava by pulling the catheter back 0.3 mm at a time under guidance with echocardiographic imaging in a respiration-gated manner. Three-dimensional (3D) reconstruction of the images of the CTI were made with a 3D reconstruction system. After the acquisition of the ICE, the CTI ablation was performed in the patients with AFL. RESULTS The 2D and 3D images provided clear visualization of the tricuspid valve, coronary sinus ostium, fossa ovalis and Eustachian valve/ridge (EVR). The CTI was significantly longer in the patients with AFL than in those without AFL (median length 24.6 mm (range 17.0-39.1 mm) versus median length 20.6 mm (range 12.5-28.0 mm), respectively, P < 0.05). However, a deep recess due to a prominent EVR was observed in 9 of 12 (75%) patients with AFL and in 12 of 20 (60%) patients without AFL (N.S.). A deep recess and the relatively long CTI were related to aging in all the study patients, and that relationship was similar in a limited number of patients without AFL. In five patients with AFL resistant to ablation, a deep recess and prominent EVR were observed. CONCLUSIONS The 2D and 3D ICE were useful for visualizing the complex anatomy of the CTI and identifying the anatomical characteristics of the CTIs refractory to ablation therapy. The anatomical changes observed in the CTI region may simply be the result of aging and may partially be involved in the development of AFL.
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Affiliation(s)
- Yasuo Okumura
- Department of Cardiovascular Disease, Nihon University School of Medicine, 30-1 Oyaguchi-kami, Itabashi-Ku, Tokyo, 173-8610, Japan
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Catheter Ablation of Supraventricular and Ventricular Arrhythmias. CARDIOVASCULAR MEDICINE 2007. [DOI: 10.1007/978-1-84628-715-2_105] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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Abstract
For a long time, it has been known that atrial fibrillation and atrial flutter have a close clinical interrelationship. Recent electrophysiological studies, especially mapping studies, have significantly advanced our understanding of this interrelationship. Regarding the relationship of atrial fibrillation with atrial flutter: Atrial fibrillation of variable duration precedes the onset of atrial flutter in almost all instances. During the atrial fibrillation, the functional components needed to complete the atrial flutter reentrant circuit, principally a line of block between the venae cavae, are formed. If this line of block does not form, classical atrial flutter does not develop. If this line of block shortens or disappears, classical atrial flutter disappears. In fact, it is fair to say that the major determinant of whether atrial fibrillation persists or classical atrial flutter develops is whether a line of block forms between the venae cavae. Regarding the relationship of atrial flutter with atrial fibrillation: Studies in experimental models and now in patients have demonstrated that a driver (a rapidly firing focus or a reentrant circuit of very short cycle length) can cause atrial fibrillation by producing fibrillatory conduction to the rest of the atria. When the driver is a stable reentrant circuit of very short cycle length, it is, in effect, a very fast form of atrial flutter. There probably is a spectrum of reentrant circuits of short cycle length, i.e., "atrial flutter," that depend, in part, on where the reentrant circuit is located. When the cycle length of the reentrant circuit is so short that it will only activate small portions of the atria in a 1:1 manner, the rest of the atria will be activated rapidly but irregularly, i.e., via fibrillatory conduction, resulting in atrial fibrillation. In short, there are probably several mechanisms of atrial fibrillation, one of which is due to a very rapid atrial flutter circuit causing fibrillatory conduction. In sum, atrial fibrillation and atrial flutter have an important interrelationship.
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Affiliation(s)
- Albert L Waldo
- Department of Medicine, Case Western Reserve University, Cleveland, OH, USA.
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Yamabe H, Tanaka Y, Yamamuro M, Ogawa H, Kimura Y, Hokamura Y. Vector Mapping in Localizing the Transverse Conduction Site of the Crista Terminalis in Patients with Typical Atrial Flutter. PACING AND CLINICAL ELECTROPHYSIOLOGY: PACE 2005; 28:685-91. [PMID: 16008805 DOI: 10.1111/j.1540-8159.2005.00142.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
BACKGROUND The difference in the conduction properties of the crista terminalis (CT) along its course, has not been fully clarified. Using the vector mapping method, we localized the transverse conduction (TC) site of the CT and elucidated its conduction capabilities in patients with typical atrial flutter (AF). METHODS The TC site of the CT was localized by the analysis of the polarity reversal of the double potentials recorded at 10 sites along the CT using a 20-pole deflectable catheter in 17 patients. The conduction capabilities of the TC site were analyzed during incremental pacing delivered from 100 beats/min to 2-to-1 local capture at the low anterior (LARA) and posterior (LPRA) right atrium. RESULTS At a pacing rate of 100 beats/min, TC at a single site was observed in 15 patients during LARA pacing and 7 patients during LPRA pacing, respectively. TC sites were distributed from superior to middle third of the CT in all patients. TC was bidirectional in 4 sites, but was unidirectional in the remaining 14 sites. Following an increase in the pacing rate, TC was blocked in all 7 sites during LPRA pacing and 11 of 15 sites during LARA pacing. Shift in the location of the TC site was not observed in any of the patients before TC block. The conduction block rate during pacing from LARA was significantly higher than that from LPRA (211 +/- 59 beats/min vs 145 +/- 66 beats/min, P < 0.01). CONCLUSIONS The superior to middle third of the CT provides TC capabilities. The TC across the CT was caused by a preferential conduction site and most of these TC were unidirectional, and stable in location irrespective of the change in the conduction rate.
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Okumura Y, Watanabe I, Yamada T, Ohkubo K, Sugimura H, Hashimoto K, Kofune T, Takagi Y, Wakita R, Oshikawa N, Kawauchi K, Saito S, Ozawa Y, Kanmatsuse K, Yoshikawa Y, Asakawa Y. Relationship Between Anatomic Location of the Crista Terminalis and Double Potentials Recorded During Atrial Flutter:. J Cardiovasc Electrophysiol 2004; 15:1426-32. [PMID: 15610291 DOI: 10.1046/j.1540-8167.2004.04379.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
INTRODUCTION The activation sequence in typical atrial flutter (AFL) around the tricuspid annulus is well described. However, activation of the remainder of the right atrium (RA) is not well defined. Previous studies have shown a linear block at the crista terminalis (CT) during AFL. The aim of this study was to evaluate the relationship between the location of the CT and the line of block by intracardiac echocardiography (ICE). METHODS AND RESULTS Twenty-one patients with typical AFL were included in the study. The ICE imaging catheter (9-French with 9-MHz ultrasound transducer) was advanced to the RA. Under ICE guidance, a 20-pole roving catheter was used to map double potentials (DPs) during AFL, and three-dimensional images of the RA were reconstructed. During counterclockwise (CCW), clockwise (CW) AFL, or both, a line of conduction block manifested by DPs was identified at a septal site adjacent to the CT in 12 patients and in the posteroseptal RA in 9 patients. CONCLUSION The functional line of block in CCW and CW AFL is localized not at the CT but at the septal edge of the CT or in the posteroseptal RA.
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Affiliation(s)
- Yasuo Okumura
- Division of Cardiovascular Disease, Department of Medicine, Nihon University School of Medicine, Tokyo, Japan
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Sporton SC, Davies DW, Earley MJ, Markides V, Nathan AW, Schilling RJ. Catheter Inversion:. A Technique to Complete Isthmus Ablation and Cure Atrial Flutter. PACING AND CLINICAL ELECTROPHYSIOLOGY: PACE 2004; 27:775-8. [PMID: 15189533 DOI: 10.1111/j.1540-8159.2004.00527.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Cure of typical atrial flutter (AFL) by catheter ablation to produce bidirectional block across the tricuspid annulus-inferior vena cava isthmus (IS) is highly effective, but failures may occur. We describe a technique that may allow creation of bidirectional block where a conventional strategy has failed. AFL ablation was performed using the conventional approach with a mapping/ablation (ablation) catheter introduced via the right femoral vein (RFV) to create a line of bidirectional block across the IS. If this was not achieved after five passes of the ablation catheter from the tricuspid annulus to the inferior vena cava (IVC) a catheter inversion technique was used. This allowed stable positioning of the ablation catheter at the IVC end of the isthmus. In 11 patients, a mean of 17 (range 3 to 45) radiofrequency (RF) applications was given before the catheter inversion technique was applied. Following catheter inversion a mean of 4 (1 to 14) further RF applications achieved bidirectional isthmus block in every patient. No complications occurred. Catheter inversion provides a simple, safe, and effective means of achieving bidirectional isthmus conduction block in cases where a conventional ablation strategy might have failed.
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Affiliation(s)
- Simon C Sporton
- Department of Cardiology, Bart's and The London NHS Trust, London, UK
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Lai LP, Lin JL, Lin JM, Du CC, Tseng YZ, Huang SKS. Use of Double-Potential Barrier to Identify Functional Isthmus at the Cavotricuspid Isthmus for Facilitating Catheter Ablation of Isthmus-Dependent Atrial Flutter. J Cardiovasc Electrophysiol 2004; 15:396-401. [PMID: 15089986 DOI: 10.1046/j.1540-8167.2004.03424.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
INTRODUCTION The aim of the study was to identify an alternative target for more effective radiofrequency catheter ablation (RFCA) of isthmus-dependent atrial flutter (AFL). METHODS AND RESULTS We hypothesized that a functional isthmus formed by preexisting double potential barrier at the cavotricuspid isthmus (CTI) could serve as a new target site for facilitating RFCA of AFL. Forty-three consecutive patients with recurrent isthmus-dependent AFL were studied using three-dimensional navigated magnetic mapping and ablation technique. Twenty patients (47%, group A) were shown to have a narrower functional channel at the CTI (functional isthmus). The remaining 23 patients did not have this feature (53%, group B). In group A, double potentials were clustered near the border of the inferior vena cava (IVC) of the CTI and served as a functional channel along the tricuspid annulus (TA). The interspike interval of double potentials was 87 +/- 26 ms near the IVC border and 45 +/- 17 ms (P < 0.0001) near the TA border of CTI. RFCA targeting at the functional isthmus in group A resulted in interruption of bidirectional transisthmus conduction with fewer radiofrequency pulses (6.7 +/- 4.7 in group A vs 21.1 +/- 17.1 pulses in group B, P < 0.001), shorter ablation line (11.6 +/- 4.0 mm vs 37.8 +/- 7.2 mm, P < 0.0001) with no arrhythmia recurrence. These functional isthmuses were found to be located at the lateral third of CTI in 12 patients, middle third in 7, and medial third in 1. This finding is different from that obtained by the conventional method in group B (lateral in 5, middle in 16, medial in 2, P < 0.038). CONCLUSION In our study, a functional, rather than anatomic, isthmus formed by preexisting double-potential barrier at the CTI was identified in 47% of patients with isthmus-dependent AFL. It is a useful guide to facilitate RFCA of isthmus-dependent AFL.
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Affiliation(s)
- Ling-Ping Lai
- Division of Cardiology, Department of Internal Medicine, National Taiwan University Hospital and National Taiwan University College of Medicine, 7 Chun-Shan S. Road, Taipei, Taiwan
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Date T, Abe K, Miyazaki H, Yamane T, Sugimoto K, Mogi J, Honda Y, Noma K, Ishikawa S, Mochizuki S. Various routes of septal propagation in common atrial flutter. J Interv Card Electrophysiol 2003; 9:317-26. [PMID: 14618051 DOI: 10.1023/a:1027483124506] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
INTRODUCTION Although in the treatment of common atrial flutter, the isthmus between the tricuspid valve annulus and the eustachian ridge is often chosen as the site for conduction block by radiofrequency ablation, the precise path of the flutter circuit remains unknown. We therefore investigated the propagation of the atrial flutter wave front around the coronary sinus ostium and how its path is altered by application of radiofrequency current. METHODS AND RESULTS To assess activation pattern, activation in the region surrounding the coronary sinus ostium was mapped using a deflectable decapolar catheter under basal conditions and while applying radiofrequency current to the septal isthmus, between the tricuspid valve annulus and the eustachian ridge. In five of eleven patients studied, the eustachian ridge side, below the coronary sinus ostium, was activated earlier, and the flutter wave exited from either the tricuspid valve annulus side or the eustachian ridge side, above the coronary sinus ostium. In four patients, a partial line of block created by applying radiofrequency current between the tricuspid valve annulus and the coronary sinus ostium or between the coronary sinus ostium and the eustachian ridge led to a shift in the direction of propagation of the flutter wave front from anterior to posterior or from posterior to anterior of the coronary sinus ostium, and prolongation of the cycle length. CONCLUSION Application of radiofrequency current to the septal isthmus, between the tricuspid valve annulus and the eustachian ridge, can shift both the anterior and posterior propagation of flutter around the coronary sinus ostium.
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Affiliation(s)
- Taro Date
- Department of Internal Medicine, Jikei University School of Medicine, 3-25-8 Nishi-shinbashi, Minato-ku, Tokyo 105-8461, Japan.
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Abstract
It has been appreciated for a long time that atrial flutter and atrial fibrillation have a clinical relationship. Now, with the technological advances that permit more sophisticated electrophysiological studies, especially mapping studies, we have significantly advanced our understanding of this interrelationship. Regarding the relationship at atrial fibrillation to atrial flutter: Atrial fibrillation of variable duration (very brief to prolonged episodes) precedes the onset of atrial flutter in most instances. It seems that during the period of atrial fibrillation, the functional components of the atrial flutter reentrant circuit are formed. This is principally a line of block between the venae cavae. If this line of block does not form, classical atrial flutter does not form. And if this line of block shortens or disappears, classical atrial flutter disappear as well. In fact, it might be said that the major difference in whether classical atrial flutter or atrial fibrillation develops is whether a line of block forms between the venae cavae. Regarding the relationship of atrial flutter to atrial fibrillation: Studies have demonstrated that a driver (a single focus or reentrant circuit of very short cycle length) can be responsible for causing atrial fibrillation by producing fibrillatory conduction to the rest of the atria. In experimental models and now beginning to be demonstrated in patients, this driver may be a stable reentrant circuit of very short cycle length, i.e., a fast form of atrial flutter, if you will. In fact, there is probably a spectrum of these short cycle lengths that depend, in part, on where the reentrant circuit (i.e., "atrial flutter") exists. When the stable reentrant circuit is of sufficiently short cycle length, it will only activate small portions of the atria in a 1 : 1 manner. The rest of the atria will be activated irregularly, resulting in atrial fibrillation. Unstable reentrant circuits can also do the same thing. In short, it appears that there are several mechanisms of atrial fibrillation, one of which is due to a form of very rapid atrial flutter.
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Affiliation(s)
- Albert L Waldo
- Department of Medicine, Case Western Reserve University/University Hospitals of Cleveland, Cleveland, Ohio 44106-50388, USA.
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Baszko A, Simon RDB, Rinaldi A, Gill JS. Occurrence of atrial fibrillation after flutter ablation: the significance of intra-atrial conduction and atrial vulnerability. J Electrocardiol 2003; 36:219-25. [PMID: 12942484 DOI: 10.1016/s0022-0736(03)00045-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Atrial vulnerability and intra-atrial conduction delay are important substrates for paroxysmal atrial fibrillation (AFib); however, their significance is unknown in patients undergoing atrial flutter ablation. Antegrade (high right atrium to coronary sinus: HRA-CS) and retrograde (CS-HRA) intra-atrial conduction times and AFib inducibility were assessed in 61 patients undergoing ablation for type I atrial flutter. Twenty-three patients had structural heart disease and 18 AFib before the procedure. After 16 +/- 12 months of follow-up 17 patients experienced AFib, 5 of which progressed into chronic AFib. During the study, AFib was easily inducible in 14 patients, 7 of which developed AFib (P =.03). Patients with post- ablation AFib were older (59 +/- 11 vs. 44 +/- 15 years, P =.001), had longer intra-atrial conduction times before (98 +/- 17 ms vs. 68 +/- 20 ms, P <.001) and after ablation (91 +/- 19 ms vs. 73 +/- 21 ms, P =.01) than those without AFib. Discriminant analysis revealed that only age, previous AFib and inta-atrial conduction delay (>90 ms) were independent predictors of postablation AFib. Patients without a history of AFib and with normal intra-atrial conduction had a 3% risk of AFib, while patients with both factors had a 90% risk of AFib after ablation. Intra-atrial conduction delay is an important electrophysiological factor predicting atrial fibrillation after successful flutter ablation.
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Affiliation(s)
- Artur Baszko
- Department of Cardiology, Karol Marcinkowski University of Medical Sciences, Poland.
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Schneider MAE, Ndrepepa G, Dobran I, Schreieck J, Weber S, Plewan A, Deisenhofer I, Karch MR, Schömig A, Schmitt C. LocaLisa catheter navigation reduces fluoroscopy time and dosage in ablation of atrial flutter: a prospective randomized study. J Cardiovasc Electrophysiol 2003; 14:587-90. [PMID: 12875418 DOI: 10.1046/j.1540-8167.2003.03017.x] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
INTRODUCTION Catheter ablation has become a well-established therapy for isthmus-dependent right atrial flutter (AFL). Recently, mapping and ablation of AFL have been performed using sophisticated three-dimensional mapping systems, such as electroanatomic and noncontact mapping systems. The LocaLisa system enables nonfluoroscopic navigation of intracardiac electrode catheters based on impedance changes related to catheter movements in transthoracic current fields. The aim of this randomized prospective study was to compare the efficacy of the LocaLisa system with the conventional mapping/ablation approach for radiofrequency ablation of AFL. METHODS AND RESULTS Fifty consecutive patients with AFL (39 men and 11 women; age 65 +/- 10 years) were studied. The patients were randomly assigned to undergo radiofrequency ablation guided by a conventional fluoroscopy-based approach (24 patients) or by the LocaLisa system (26 patients). Ablation success rate and documentation of bidirectional isthmus block were 100% in both groups. Compared with fluoroscopy-guided approaches, LocaLisa-guided procedures demonstrated a reduction in total fluoroscopy time from 15.9 +/- 10.6 minutes to 7.5 +/- 6.5 minutes (P < 0.005). Total fluoroscopy dosage was reduced from 21.0 +/- 19.8 to 8.7 +/- 9.5 Gycm2 (P < 0.05). Fluoroscopy time required for ablation was significantly shortened in the LocaLisa group (2.6 +/- 2.6 min) compared with the conventional approach group (11 +/- 10 min, P < 0.0005). In 9 (35%) of 26 patients, the ablation could be performed with a fluoroscopy time < or = 1 minute. There were no significant differences with regard to the number of radiofrequency applications, fluoroscopy time needed for diagnostic reasons, total procedure time, or other ablation data. CONCLUSION Compared with the conventional approach, the LocaLisa system significantly reduces the fluoroscopy times needed for ablation of typical AFL.
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Affiliation(s)
- Michael A E Schneider
- Deutsches Herzzentrum and I. Medizinische Klinik, Technische Universität München, Munich, Germany.
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Ishida A, Yoshida A, Kitamura H, Kubo S, Fukuzawa K, Yamashiro K, Yokoyama M. Identification of Functional Block Line in Atrial Flutter Using Three-Dimensional Intracardiac Echocardiography. Circ J 2003; 67:940-4. [PMID: 14578601 DOI: 10.1253/circj.67.940] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The crista terminalis (CT) is reportedly a critical barrier for maintaining typical atrial flutter (AFL), but recent observations have suggested the presence of posteromedial functional block, as well as crista conduction. Therefore, this study was designed to identify the correlation between the posterior boundary of AFL and anatomical architecture in the human right atrium (RA) using 3-dimensional (D) intracardiac echocardiography (ICE). In 11 patients with AFL (typical 9, reverse typical 2), mapping with a 10-pole (n=5) or 32-pole (n=6) catheter was performed during AFL. ICE was used to determine the catheter's position relative to the intra-atrial structures. In all patients, double potentials were recorded at the posteromedial RA and the catheter positions were recognized as posterior to the CT by 3-D ICE. Double potentials were not recorded on the CT, and the activation sequence revealed a craniocaudal direction in the 9 patients with typical AFL and caudocranial direction in the 2 patients with reverse typical AFL. These findings demonstrate that the posterior boundary of the AFL circuit is in the sinus venosa region posterior to the CT, which may provide an important insight into the mechanism of maintaining AFL.
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Affiliation(s)
- Akihiko Ishida
- Division of Cardiovascular and Respiratory Medicine, Kobe University Graduate School of Medicine, Japan
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Abstract
There is an important association between heart failure and the development of atrial arrhythmias. Although most often associated with atrial fibrillation, there is some evidence to suggest an association between heart failure and other atrial arrhythmias and, in particular, atrial flutter and atrial tachycardia. The mechanisms by which these common atrial arrhythmias may arise in patients with heart failure are discussed.
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Affiliation(s)
- Vias Markides
- Imperial College School of Medicine, National Heart and Lung Institute, Waller Cardiac Department, St Mary's Hospital, London, UK
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Prakash A, Saksena S, Krol RB, Filipecki A, Philip G. Catheter ablation of inducible atrial flutter, in combination with atrial pacing and antiarrhythmic drugs ("hybrid therapy") improves rhythm control in patients with refractory atrial fibrillation. J Interv Card Electrophysiol 2002; 6:165-72. [PMID: 11992027 DOI: 10.1023/a:1015319618049] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
UNLABELLED Atrial flutter or tachycardia may coexist with atrial fibrillation [AF] and can be treated with ablation techniques in attempt to reduce the total AF burden. The role of ablation of latent atrial tachyarrhythmias elicited at electrophysiologic study in conjunction with atrial pacing and antiarrhythmic drugs in patients with refractory AF has not been evaluated. We evaluated the efficacy of catheter ablation of electrically induced atrial flutter or atrial tachycardia in improving rhythm control in patients with refractory AF. METHODS Consecutive patients with refractory AF, and spontaneous atrial flutter (Group 1) or without spontaneous atrial flutter (Group 2) underwent programmed stimulation in a baseline drug-free state. All patients had electrically induced atrial flutter or tachycardia. Radiofrequency ablation of the arrhythmia substrate was performed in all patients. Primary endpoints evaluated for patient outcome in both groups included maintenance of rhythm control and freedom from recurrent atrial tachyarrhythmias. RESULTS Forty-three patients, with a mean age of 66 +/- 13 years were studied. Group 1 consisted of 22 patients while Group 2 had 21 patients. Ablation of the tricuspid valve-inferior venacaval isthmus was performed in 41 patients who had common atrial flutter induced at electrophysiologic study. Ablation of other atrial sites was performed in 8 patients with induced atypical flutter and 4 patients with induced atrial tachycardia. Ten of these patients had ablation of more than one arrhythmia. 17 patients (40%) had atrial pacing instituted and 28 patients remained on a class 1/3 antiarrhythmic drug. During a mean follow-up of 26 +/- 14 months, 33 patients (82.5%) remained in rhythm control. Actuarial analysis showed 96% of patients in rhythm control at 6 months, 94% at 12 months, and 90% at 24 months. Freedom from symptomatic AF recurrence was 64% at 6 months, 58% at 12 months, and 42% at 24 months. The outcome for both of these endpoints was similar for Group 1 and Group 2 (p = NS). The AF free interval increased significantly from 7+/- 9 days to 172 +/- 121 days (p < 0.01) after ablation. This increase was again similar in both the groups. In the 14 patients were who did not receive atrial pacing and who remained on the same class 1/3 antiarrhythmic drug, the AF free interval increased from 18 +/- 17 days to 212+/- 102 days (p < 0.01). CONCLUSIONS We conclude that electrophysiologic studies can elicit latent atrial flutter or tachycardia in patients with refractory AF without spontaneous monomorphic atrial tachyarrhythmias. Catheter ablation of electrically induced atrial flutter or tachycardia either alone, or with atrial pacing and with antiarrhythmic drug may improve rhythm control and reduce AF recurrences. This is similar in patients with and without spontaneous atrial flutter and refractory AF.
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Affiliation(s)
- Atul Prakash
- Arrhythmia & Pacemaker Service, Cardiovascular Institute, Atlantic Health System (East), Passaic, NJ, USA
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O'Callaghan PA, Meara M, Kongsgaard E, Poloniecki J, Luddington L, Foran J, Camm AJ, Rowland E, Ward DE. Symptomatic improvement after radiofrequency catheter ablation for typical atrial flutter. Heart 2001; 86:167-71. [PMID: 11454833 PMCID: PMC1729856 DOI: 10.1136/heart.86.2.167] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
Abstract
OBJECTIVE To assess the changes in quality of life, arrhythmia symptoms, and hospital resource utilisation following catheter ablation of typical atrial flutter. DESIGN Patient questionnaire to compare the time interval following ablation with a similar time interval before ablation. SETTING Tertiary referral centre. PATIENTS 63 consecutive patients were studied. Four patients subsequently underwent an ablate and pace procedure, two died of co-morbid illnesses, and two were lost to follow up. The remaining 55 patients form the basis of the report. RESULTS Patients were followed for a mean (SD) of 12 (9.5) months. Atrial flutter ablation resulted in an improvement in quality of life (3.8 v 2.5, p < 0.001) and reductions in symptom frequency score (2.0 v 3.5, p < 0.001) and symptom severity score (2.0 v 3.8, p < 0.001) compared with preablation values. There was a reduction in the number of patients visiting accident and emergency departments (11% v 53%, p < 0.001), requiring cardioversion (7% v 51%, p < 0.001), or being admitted to hospital for a rhythm problem (11% v 56%, p < 0.001). Subgroup analysis confirmed that patients with atrial flutter and concomitant atrial fibrillation before ablation and those with atrial flutter alone both derived significant benefit from atrial flutter ablation. Patients with concomitant atrial fibrillation had an improvement in quality of life (3.5 v 2.5, p < 0.001) and reductions in symptom frequency score (2.3 v 3.5, p < 0.001) and symptom severity score (2.2 v 3.7, p < 0.001) compared with preablation values. CONCLUSIONS Ablation of atrial flutter is recommended both in patients with atrial flutter alone and in those with concomitant atrial fibrillation.
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Affiliation(s)
- P A O'Callaghan
- Department of Cardiological Sciences, St George's Hospital Medical School, Cranmer Terrace, London SW17 0RE, UK.
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O'Callaghan PA, Meara M, Kongsgaard E, Poloniecki J, Luddington L, Foran J, Camm AJ, Rowland E, Ward DE. Symptomatic improvement after radiofrequency catheter ablation for typical atrial flutter. BRITISH HEART JOURNAL 2001. [DOI: 10.1136/hrt.86.2.167] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
OBJECTIVETo assess the changes in quality of life, arrhythmia symptoms, and hospital resource utilisation following catheter ablation of typical atrial flutter.DESIGNPatient questionnaire to compare the time interval following ablation with a similar time interval before ablation.SETTINGTertiary referral centre.PATIENTS63 consecutive patients were studied. Four patients subsequently underwent an ablate and pace procedure, two died of co-morbid illnesses, and two were lost to follow up. The remaining 55 patients form the basis of the report.RESULTSPatients were followed for a mean (SD) of 12 (9.5) months. Atrial flutter ablation resulted in an improvement in quality of life (3.8 v 2.5, p < 0.001) and reductions in symptom frequency score (2.0v 3.5, p < 0.001) and symptom severity score (2.0 v 3.8, p < 0.001) compared with preablation values. There was a reduction in the number of patients visiting accident and emergency departments (11%v 53%, p < 0.001), requiring cardioversion (7% v 51%, p < 0.001), or being admitted to hospital for a rhythm problem (11%v 56%, p < 0.001). Subgroup analysis confirmed that patients with atrial flutter and concomitant atrial fibrillation before ablation and those with atrial flutter alone both derived significant benefit from atrial flutter ablation. Patients with concomitant atrial fibrillation had an improvement in quality of life (3.5 v 2.5, p < 0.001) and reductions in symptom frequency score (2.3 v 3.5, p < 0.001) and symptom severity score (2.2v 3.7, p < 0.001) compared with preablation values.CONCLUSIONSAblation of atrial flutter is recommended both in patients with atrial flutter alone and in those with concomitant atrial fibrillation.
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Matsuo K, Uno K, Khrestian CM, Waldo AL. Conduction left-to-right and right-to-left across the crista terminalis. Am J Physiol Heart Circ Physiol 2001; 280:H1683-91. [PMID: 11247780 DOI: 10.1152/ajpheart.2001.280.4.h1683] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
A line of block between the vena cava and the crista terminalis (CT) region is important for atrial flutter (AFL), but whether it is fixed or functional is controversial. To test the hypothesis that conduction across the CT normally occurs, but when block occurs in this region it is functional, we analyzed atrial activation during right and left atrial pacing (cycle lengths of 500--130 ms), AFL, and atrial fibrillation in 15 dogs with sterile pericarditis and 7 normal dogs. Electrograms from 396 right, left, and septal atrial sites were simultaneously recorded. Activation across the CT occurred during atrial pacing, AFL, and atrial fibrillation. Activation wave fronts from the right to the left atrium and vice versa traveled over several routes, including Bachmann's bundle and inferior to the inferior vena cava, as well as across the CT. In these models, there is no fixed conduction block across the CT, and when block in the CT region occurs, as during AFL, it is functional.
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Affiliation(s)
- K Matsuo
- Division of Cardiology, Department of Medicine, Case Western Reserve University and the University Hospitals of Cleveland, Cleveland, Ohio 41106, USA
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Laurita KR, Rosenbaum DS. Interdependence of modulated dispersion and tissue structure in the mechanism of unidirectional block. Circ Res 2000; 87:922-8. [PMID: 11073889 DOI: 10.1161/01.res.87.10.922] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
We previously showed that a premature stimulus can significantly alter vulnerability to arrhythmias by modulating spatial gradients of ventricular repolarization (ie, modulated dispersion). However, it is not clear if such changes in arrhythmia vulnerability can be attributed to the formation of an electrophysiological substrate for unidirectional block and what the potential role is of tissue structure in this process. Therefore, the main objective of the present study was to examine the concomitant effect repolarization gradients and tissue structure have on unidirectional block. Optical action potentials were recorded from 128 ventricular sites (1 cm(2)) in 8 Langendorff-perfused guinea pig hearts. Propagation was confined to the epicardial surface using an endocardial cryoablation procedure, and a 12-mm barrier with a 1.5-mm isthmus was etched with a laser onto the epicardium. A premature stimulus (S2) was delivered over a range of S1S2 coupling intervals to modulate repolarization gradients in a predictable fashion. When a second premature stimulus (S3) was delivered from the center of the isthmus, the occurrence and orientation of unidirectional block were highly dependent on repolarization gradients created by the S2 beat. In this model, a local repolarization gradient of 3.2 ms/mm was required for unidirectional block at this isthmus. In addition, the formation of unidirectional block was critically dependent on the presence of the source-sink mismatch imposed by the isthmus. These results may explain how the interplay between spatial heterogeneities of repolarization and tissue structure form a substrate for unidirectional block and reentry.
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Affiliation(s)
- K R Laurita
- Heart and Vascular Research Center, MetroHealth Campus, Case Western Reserve University, Cleveland, Ohio, USA.
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