Preprocedural Clinical Parameters Determining Perimitral Conduction Time During Mitral Isthmus Line Ablation

BACKGROUND—Achievement of complete conduction block across left mitral isthmus (MI) is challenging. Anticipation of perimitral conduction time (PMCT) associated with MI block may expedite this procedure. We evaluated the relationship between the preprocedural variables and the quantum of PMCT in pat...

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Veröffentlicht in:Circulation. Arrhythmia and electrophysiology 2011-06, Vol.4 (3), p.287-294
Hauptverfasser: Miyazaki, Shinsuke, Shah, Ashok J, Liu, Xingpeng, Jadidi, Amir S, Nault, Isabelle, Wright, Matthew, Forclaz, Andrei, Linton, Nick, Xhaët, Olivier, Rivard, Lena, Derval, Nicolas, Knecht, Sébastien, Sacher, Frédéric, Hocini, Mélèze, Jaïs, Pierre, Haïssaguerre, Michel
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container_issue 3
container_start_page 287
container_title Circulation. Arrhythmia and electrophysiology
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creator Miyazaki, Shinsuke
Shah, Ashok J
Liu, Xingpeng
Jadidi, Amir S
Nault, Isabelle
Wright, Matthew
Forclaz, Andrei
Linton, Nick
Xhaët, Olivier
Rivard, Lena
Derval, Nicolas
Knecht, Sébastien
Sacher, Frédéric
Hocini, Mélèze
Jaïs, Pierre
Haïssaguerre, Michel
description BACKGROUND—Achievement of complete conduction block across left mitral isthmus (MI) is challenging. Anticipation of perimitral conduction time (PMCT) associated with MI block may expedite this procedure. We evaluated the relationship between the preprocedural variables and the quantum of PMCT in patients with bidirectionally blocked MI. METHODS AND RESULTS—We reviewed clinical and echocardiographic parameters in 290 consecutive patients with confirmed bidirectional MI block during atrial fibrillation (AF) ablation. PMCT was defined as the temporal delay to the latest of the double potentials on the line of block while pacing posteroseptal to it in the left atrium (LA). LA size and type of AF significantly influenced PMCT in multivariate analysis. A cumulative score based on LA size (0≦45 mm; 1>45 mm) and type of AF (0paroxysmal; 1=nonparoxysmal) ranged from 0 to 2. PMCT was directly correlated to the cumulative score (0169 ms; n=78; 95% confidential interval, 156 to 181); 1187 ms; n=103; 95% confidential interval, 178 to 196; 2209 ms; n=109; 95% confidential interval, 200 to 217). In 61 patients who underwent AF ablation twice, the difference between 2 PMCT values was
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Anticipation of perimitral conduction time (PMCT) associated with MI block may expedite this procedure. We evaluated the relationship between the preprocedural variables and the quantum of PMCT in patients with bidirectionally blocked MI. METHODS AND RESULTS—We reviewed clinical and echocardiographic parameters in 290 consecutive patients with confirmed bidirectional MI block during atrial fibrillation (AF) ablation. PMCT was defined as the temporal delay to the latest of the double potentials on the line of block while pacing posteroseptal to it in the left atrium (LA). LA size and type of AF significantly influenced PMCT in multivariate analysis. A cumulative score based on LA size (0≦45 mm; 1&gt;45 mm) and type of AF (0paroxysmal; 1=nonparoxysmal) ranged from 0 to 2. PMCT was directly correlated to the cumulative score (0169 ms; n=78; 95% confidential interval, 156 to 181); 1187 ms; n=103; 95% confidential interval, 178 to 196; 2209 ms; n=109; 95% confidential interval, 200 to 217). In 61 patients who underwent AF ablation twice, the difference between 2 PMCT values was &lt;30 ms in 75% patients. Another consecutive 143 patients with and without MI block after at least 15 minutes of radiofrequency application were analyzed. Perimitral conduction delay &lt;130 ms ruled out bidirectional MI block. Perimitral conduction delay &gt;173 ms predicted bidirectional block with an accuracy of 86%. CONCLUSIONS—LA size and AF type significantly influence PMCT in patients undergoing successful MI ablation. These parameters can be used to predict the time value associated with MI block, preprocedurally.</description><identifier>ISSN: 1941-3149</identifier><identifier>EISSN: 1941-3084</identifier><identifier>DOI: 10.1161/CIRCEP.110.958983</identifier><identifier>PMID: 21372269</identifier><language>eng</language><publisher>Hagerstown, MD: American Heart Association, Inc</publisher><subject>Atrial Appendage - physiopathology ; Atrial Appendage - surgery ; Biological and medical sciences ; Body Surface Potential Mapping - methods ; Cardiac dysrhythmias ; Cardiology. Vascular system ; Cardiovascular system ; Catheter Ablation - methods ; Coronary Sinus - physiopathology ; Female ; Follow-Up Studies ; Heart ; Heart Conduction System - physiopathology ; Heart Conduction System - surgery ; Humans ; Investigative techniques, diagnostic techniques (general aspects) ; Male ; Medical sciences ; Middle Aged ; Preoperative Care - methods ; Radiotherapy. Instrumental treatment. Physiotherapy. 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Arrhythmia and electrophysiology</title><addtitle>Circ Arrhythm Electrophysiol</addtitle><description>BACKGROUND—Achievement of complete conduction block across left mitral isthmus (MI) is challenging. Anticipation of perimitral conduction time (PMCT) associated with MI block may expedite this procedure. We evaluated the relationship between the preprocedural variables and the quantum of PMCT in patients with bidirectionally blocked MI. METHODS AND RESULTS—We reviewed clinical and echocardiographic parameters in 290 consecutive patients with confirmed bidirectional MI block during atrial fibrillation (AF) ablation. PMCT was defined as the temporal delay to the latest of the double potentials on the line of block while pacing posteroseptal to it in the left atrium (LA). LA size and type of AF significantly influenced PMCT in multivariate analysis. A cumulative score based on LA size (0≦45 mm; 1&gt;45 mm) and type of AF (0paroxysmal; 1=nonparoxysmal) ranged from 0 to 2. PMCT was directly correlated to the cumulative score (0169 ms; n=78; 95% confidential interval, 156 to 181); 1187 ms; n=103; 95% confidential interval, 178 to 196; 2209 ms; n=109; 95% confidential interval, 200 to 217). In 61 patients who underwent AF ablation twice, the difference between 2 PMCT values was &lt;30 ms in 75% patients. Another consecutive 143 patients with and without MI block after at least 15 minutes of radiofrequency application were analyzed. Perimitral conduction delay &lt;130 ms ruled out bidirectional MI block. Perimitral conduction delay &gt;173 ms predicted bidirectional block with an accuracy of 86%. CONCLUSIONS—LA size and AF type significantly influence PMCT in patients undergoing successful MI ablation. 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Vascular system</subject><subject>Cardiovascular system</subject><subject>Catheter Ablation - methods</subject><subject>Coronary Sinus - physiopathology</subject><subject>Female</subject><subject>Follow-Up Studies</subject><subject>Heart</subject><subject>Heart Conduction System - physiopathology</subject><subject>Heart Conduction System - surgery</subject><subject>Humans</subject><subject>Investigative techniques, diagnostic techniques (general aspects)</subject><subject>Male</subject><subject>Medical sciences</subject><subject>Middle Aged</subject><subject>Preoperative Care - methods</subject><subject>Radiotherapy. Instrumental treatment. Physiotherapy. Reeducation. Rehabilitation, orthophony, crenotherapy. 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Vascular system</topic><topic>Cardiovascular system</topic><topic>Catheter Ablation - methods</topic><topic>Coronary Sinus - physiopathology</topic><topic>Female</topic><topic>Follow-Up Studies</topic><topic>Heart</topic><topic>Heart Conduction System - physiopathology</topic><topic>Heart Conduction System - surgery</topic><topic>Humans</topic><topic>Investigative techniques, diagnostic techniques (general aspects)</topic><topic>Male</topic><topic>Medical sciences</topic><topic>Middle Aged</topic><topic>Preoperative Care - methods</topic><topic>Radiotherapy. Instrumental treatment. Physiotherapy. Reeducation. Rehabilitation, orthophony, crenotherapy. 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Arrhythmia and electrophysiology</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Miyazaki, Shinsuke</au><au>Shah, Ashok J</au><au>Liu, Xingpeng</au><au>Jadidi, Amir S</au><au>Nault, Isabelle</au><au>Wright, Matthew</au><au>Forclaz, Andrei</au><au>Linton, Nick</au><au>Xhaët, Olivier</au><au>Rivard, Lena</au><au>Derval, Nicolas</au><au>Knecht, Sébastien</au><au>Sacher, Frédéric</au><au>Hocini, Mélèze</au><au>Jaïs, Pierre</au><au>Haïssaguerre, Michel</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Preprocedural Clinical Parameters Determining Perimitral Conduction Time During Mitral Isthmus Line Ablation</atitle><jtitle>Circulation. Arrhythmia and electrophysiology</jtitle><addtitle>Circ Arrhythm Electrophysiol</addtitle><date>2011-06</date><risdate>2011</risdate><volume>4</volume><issue>3</issue><spage>287</spage><epage>294</epage><pages>287-294</pages><issn>1941-3149</issn><eissn>1941-3084</eissn><abstract>BACKGROUND—Achievement of complete conduction block across left mitral isthmus (MI) is challenging. Anticipation of perimitral conduction time (PMCT) associated with MI block may expedite this procedure. We evaluated the relationship between the preprocedural variables and the quantum of PMCT in patients with bidirectionally blocked MI. METHODS AND RESULTS—We reviewed clinical and echocardiographic parameters in 290 consecutive patients with confirmed bidirectional MI block during atrial fibrillation (AF) ablation. PMCT was defined as the temporal delay to the latest of the double potentials on the line of block while pacing posteroseptal to it in the left atrium (LA). LA size and type of AF significantly influenced PMCT in multivariate analysis. A cumulative score based on LA size (0≦45 mm; 1&gt;45 mm) and type of AF (0paroxysmal; 1=nonparoxysmal) ranged from 0 to 2. PMCT was directly correlated to the cumulative score (0169 ms; n=78; 95% confidential interval, 156 to 181); 1187 ms; n=103; 95% confidential interval, 178 to 196; 2209 ms; n=109; 95% confidential interval, 200 to 217). In 61 patients who underwent AF ablation twice, the difference between 2 PMCT values was &lt;30 ms in 75% patients. Another consecutive 143 patients with and without MI block after at least 15 minutes of radiofrequency application were analyzed. Perimitral conduction delay &lt;130 ms ruled out bidirectional MI block. Perimitral conduction delay &gt;173 ms predicted bidirectional block with an accuracy of 86%. CONCLUSIONS—LA size and AF type significantly influence PMCT in patients undergoing successful MI ablation. These parameters can be used to predict the time value associated with MI block, preprocedurally.</abstract><cop>Hagerstown, MD</cop><pub>American Heart Association, Inc</pub><pmid>21372269</pmid><doi>10.1161/CIRCEP.110.958983</doi><tpages>8</tpages><oa>free_for_read</oa></addata></record>
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source MEDLINE; American Heart Association Journals; EZB-FREE-00999 freely available EZB journals
subjects Atrial Appendage - physiopathology
Atrial Appendage - surgery
Biological and medical sciences
Body Surface Potential Mapping - methods
Cardiac dysrhythmias
Cardiology. Vascular system
Cardiovascular system
Catheter Ablation - methods
Coronary Sinus - physiopathology
Female
Follow-Up Studies
Heart
Heart Conduction System - physiopathology
Heart Conduction System - surgery
Humans
Investigative techniques, diagnostic techniques (general aspects)
Male
Medical sciences
Middle Aged
Preoperative Care - methods
Radiotherapy. Instrumental treatment. Physiotherapy. Reeducation. Rehabilitation, orthophony, crenotherapy. Diet therapy and various other treatments (general aspects)
Retrospective Studies
Treatment Outcome
Ultrasonic investigative techniques
title Preprocedural Clinical Parameters Determining Perimitral Conduction Time During Mitral Isthmus Line Ablation
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