Proactive Mapping and Preventive Ablation Reduce Defibrillator Implantation Rates in Tetralogy of Fallot

In patients with repaired tetralogy of Fallot (rTOF) and spontaneous ventricular tachycardia (VT), transection of slow-conducting anatomical isthmus (SCAI) by ablation results in excellent long-term VT-free survival. In patients without prior VT, proactive electroanatomical mapping and preventive SC...

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Published inJournal of the American College of Cardiology Vol. 85; no. 17; pp. 1695 - 1705
Main Authors Kimura, Yoshitaka, Wallet, Justin, Brouwer, Charlotte, Bokma, Jouke P., Bertels, Robin A., Jongbloed, Monique R.M., Hazekamp, Mark G., Blom, Nico A., Zeppenfeld, Katja
Format Journal Article
LanguageEnglish
Published United States Elsevier Inc 06.05.2025
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ISSN0735-1097
1558-3597
1558-3597
DOI10.1016/j.jacc.2025.03.523

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Abstract In patients with repaired tetralogy of Fallot (rTOF) and spontaneous ventricular tachycardia (VT), transection of slow-conducting anatomical isthmus (SCAI) by ablation results in excellent long-term VT-free survival. In patients without prior VT, proactive electroanatomical mapping and preventive SCAI ablation may impact patient selection for primary prevention implantable cardioverter-defibrillator (ICD) implantation. The purpose of this study was to evaluate long-term outcomes after proactive electroanatomical mapping and ablation of SCAI and its impact on patient selection for primary prevention ICD implantation, compared with current risk stratification methods in rTOF patients without prior VT. Consecutive rTOF patients without prior VT who underwent electroanatomical mapping for VT substrate identification were included (2005-2020). After successful SCAI ablation, ICD implantation was offered but was subject to shared decision making. The potential eligibility for ICD implantation was retrospectively determined using the following: 1) a clinical risk score; 2) guideline-recommended risk factors (American Heart Association [AHA] 2018 guidelines without late gadolinium enhancement [LGE] on cardiac magnetic resonance [CMR] information, AHA 2018 guidelines with LGE-CMR information, European Society of Cardiology [ESC] 2022 guidelines); and 3) electroanatomical mapping and SCAI ablation results. In the latter, patients with a nontransected SCAI, VT substrates remote from anatomical isthmuses, or severe right-/left ventricular dysfunction qualified for ICDs. A total of 97 patients were included (age 35 ± 16 years, 57 men); 33 patients (34%) had SCAI and 19 (20%) had inducible monomorphic VT (17 of 19 SCAI-dependent VT). Successful SCAI transection was achieved in 87% (26 of 30 patients) in whom attempted, without complications. In total, 13 patients received an ICD implantation. During a median follow-up of 58 months (Q1-Q3: 30-99 months), 4 patients (4%) had VT, all after ablation failure. According to clinical risk score, AHA 2018 guidelines without LGE-CMR information, AHA 2018 guidelines with LGE-CMR information, and ESC 2022 guidelines, 49 (51%), 24 (25%), 31 (32%), and 48 patients (49%) would have qualified for ICDs, respectively. After proactive mapping and preventive ablation, 11 patients (11%) remained ICD candidates, including all 4 with a VT event during the follow-up (annual VT risk 7%/y). Long-term outcome of rTOF patients without SCAI is excellent. Proactive electroanatomical mapping and preventive SCAI ablation may significantly reduce primary prevention ICD implantation rates compared with current risk prediction methods. [Display omitted]
AbstractList In patients with repaired tetralogy of Fallot (rTOF) and spontaneous ventricular tachycardia (VT), transection of slow-conducting anatomical isthmus (SCAI) by ablation results in excellent long-term VT-free survival. In patients without prior VT, proactive electroanatomical mapping and preventive SCAI ablation may impact patient selection for primary prevention implantable cardioverter-defibrillator (ICD) implantation.BACKGROUNDIn patients with repaired tetralogy of Fallot (rTOF) and spontaneous ventricular tachycardia (VT), transection of slow-conducting anatomical isthmus (SCAI) by ablation results in excellent long-term VT-free survival. In patients without prior VT, proactive electroanatomical mapping and preventive SCAI ablation may impact patient selection for primary prevention implantable cardioverter-defibrillator (ICD) implantation.The purpose of this study was to evaluate long-term outcomes after proactive electroanatomical mapping and ablation of SCAI and its impact on patient selection for primary prevention ICD implantation, compared with current risk stratification methods in rTOF patients without prior VT.OBJECTIVESThe purpose of this study was to evaluate long-term outcomes after proactive electroanatomical mapping and ablation of SCAI and its impact on patient selection for primary prevention ICD implantation, compared with current risk stratification methods in rTOF patients without prior VT.Consecutive rTOF patients without prior VT who underwent electroanatomical mapping for VT substrate identification were included (2005-2020). After successful SCAI ablation, ICD implantation was offered but was subject to shared decision making. The potential eligibility for ICD implantation was retrospectively determined using the following: 1) a clinical risk score; 2) guideline-recommended risk factors (American Heart Association [AHA] 2018 guidelines without late gadolinium enhancement [LGE] on cardiac magnetic resonance [CMR] information, AHA 2018 guidelines with LGE-CMR information, European Society of Cardiology [ESC] 2022 guidelines); and 3) electroanatomical mapping and SCAI ablation results. In the latter, patients with a nontransected SCAI, VT substrates remote from anatomical isthmuses, or severe right-/left ventricular dysfunction qualified for ICDs.METHODSConsecutive rTOF patients without prior VT who underwent electroanatomical mapping for VT substrate identification were included (2005-2020). After successful SCAI ablation, ICD implantation was offered but was subject to shared decision making. The potential eligibility for ICD implantation was retrospectively determined using the following: 1) a clinical risk score; 2) guideline-recommended risk factors (American Heart Association [AHA] 2018 guidelines without late gadolinium enhancement [LGE] on cardiac magnetic resonance [CMR] information, AHA 2018 guidelines with LGE-CMR information, European Society of Cardiology [ESC] 2022 guidelines); and 3) electroanatomical mapping and SCAI ablation results. In the latter, patients with a nontransected SCAI, VT substrates remote from anatomical isthmuses, or severe right-/left ventricular dysfunction qualified for ICDs.A total of 97 patients were included (age 35 ± 16 years, 57 men); 33 patients (34%) had SCAI and 19 (20%) had inducible monomorphic VT (17 of 19 SCAI-dependent VT). Successful SCAI transection was achieved in 87% (26 of 30 patients) in whom attempted, without complications. In total, 13 patients received an ICD implantation. During a median follow-up of 58 months (Q1-Q3: 30-99 months), 4 patients (4%) had VT, all after ablation failure. According to clinical risk score, AHA 2018 guidelines without LGE-CMR information, AHA 2018 guidelines with LGE-CMR information, and ESC 2022 guidelines, 49 (51%), 24 (25%), 31 (32%), and 48 patients (49%) would have qualified for ICDs, respectively. After proactive mapping and preventive ablation, 11 patients (11%) remained ICD candidates, including all 4 with a VT event during the follow-up (annual VT risk 7%/y).RESULTSA total of 97 patients were included (age 35 ± 16 years, 57 men); 33 patients (34%) had SCAI and 19 (20%) had inducible monomorphic VT (17 of 19 SCAI-dependent VT). Successful SCAI transection was achieved in 87% (26 of 30 patients) in whom attempted, without complications. In total, 13 patients received an ICD implantation. During a median follow-up of 58 months (Q1-Q3: 30-99 months), 4 patients (4%) had VT, all after ablation failure. According to clinical risk score, AHA 2018 guidelines without LGE-CMR information, AHA 2018 guidelines with LGE-CMR information, and ESC 2022 guidelines, 49 (51%), 24 (25%), 31 (32%), and 48 patients (49%) would have qualified for ICDs, respectively. After proactive mapping and preventive ablation, 11 patients (11%) remained ICD candidates, including all 4 with a VT event during the follow-up (annual VT risk 7%/y).Long-term outcome of rTOF patients without SCAI is excellent. Proactive electroanatomical mapping and preventive SCAI ablation may significantly reduce primary prevention ICD implantation rates compared with current risk prediction methods.CONCLUSIONSLong-term outcome of rTOF patients without SCAI is excellent. Proactive electroanatomical mapping and preventive SCAI ablation may significantly reduce primary prevention ICD implantation rates compared with current risk prediction methods.
AbstractBackgroundIn patients with repaired tetralogy of Fallot (rTOF) and spontaneous ventricular tachycardia (VT), transection of slow-conducting anatomical isthmus (SCAI) by ablation results in excellent long-term VT-free survival. In patients without prior VT, proactive electroanatomical mapping and preventive SCAI ablation may impact patient selection for primary prevention implantable cardioverter-defibrillator (ICD) implantation. ObjectivesThe purpose of this study was to evaluate long-term outcomes after proactive electroanatomical mapping and ablation of SCAI and its impact on patient selection for primary prevention ICD implantation, compared with current risk stratification methods in rTOF patients without prior VT. MethodsConsecutive rTOF patients without prior VT who underwent electroanatomical mapping for VT substrate identification were included (2005-2020). After successful SCAI ablation, ICD implantation was offered but was subject to shared decision making. The potential eligibility for ICD implantation was retrospectively determined using the following: 1) a clinical risk score; 2) guideline-recommended risk factors (American Heart Association [AHA] 2018 guidelines without late gadolinium enhancement [LGE] on cardiac magnetic resonance [CMR] information, AHA 2018 guidelines with LGE-CMR information, European Society of Cardiology [ESC] 2022 guidelines); and 3) electroanatomical mapping and SCAI ablation results. In the latter, patients with a nontransected SCAI, VT substrates remote from anatomical isthmuses, or severe right-/left ventricular dysfunction qualified for ICDs. ResultsA total of 97 patients were included (age 35 ± 16 years, 57 men); 33 patients (34%) had SCAI and 19 (20%) had inducible monomorphic VT (17 of 19 SCAI-dependent VT). Successful SCAI transection was achieved in 87% (26 of 30 patients) in whom attempted, without complications. In total, 13 patients received an ICD implantation. During a median follow-up of 58 months (Q1-Q3: 30-99 months), 4 patients (4%) had VT, all after ablation failure. According to clinical risk score, AHA 2018 guidelines without LGE-CMR information, AHA 2018 guidelines with LGE-CMR information, and ESC 2022 guidelines, 49 (51%), 24 (25%), 31 (32%), and 48 patients (49%) would have qualified for ICDs, respectively. After proactive mapping and preventive ablation, 11 patients (11%) remained ICD candidates, including all 4 with a VT event during the follow-up (annual VT risk 7%/y). ConclusionsLong-term outcome of rTOF patients without SCAI is excellent. Proactive electroanatomical mapping and preventive SCAI ablation may significantly reduce primary prevention ICD implantation rates compared with current risk prediction methods.
In patients with repaired tetralogy of Fallot (rTOF) and spontaneous ventricular tachycardia (VT), transection of slow-conducting anatomical isthmus (SCAI) by ablation results in excellent long-term VT-free survival. In patients without prior VT, proactive electroanatomical mapping and preventive SCAI ablation may impact patient selection for primary prevention implantable cardioverter-defibrillator (ICD) implantation. The purpose of this study was to evaluate long-term outcomes after proactive electroanatomical mapping and ablation of SCAI and its impact on patient selection for primary prevention ICD implantation, compared with current risk stratification methods in rTOF patients without prior VT. Consecutive rTOF patients without prior VT who underwent electroanatomical mapping for VT substrate identification were included (2005-2020). After successful SCAI ablation, ICD implantation was offered but was subject to shared decision making. The potential eligibility for ICD implantation was retrospectively determined using the following: 1) a clinical risk score; 2) guideline-recommended risk factors (American Heart Association [AHA] 2018 guidelines without late gadolinium enhancement [LGE] on cardiac magnetic resonance [CMR] information, AHA 2018 guidelines with LGE-CMR information, European Society of Cardiology [ESC] 2022 guidelines); and 3) electroanatomical mapping and SCAI ablation results. In the latter, patients with a nontransected SCAI, VT substrates remote from anatomical isthmuses, or severe right-/left ventricular dysfunction qualified for ICDs. A total of 97 patients were included (age 35 ± 16 years, 57 men); 33 patients (34%) had SCAI and 19 (20%) had inducible monomorphic VT (17 of 19 SCAI-dependent VT). Successful SCAI transection was achieved in 87% (26 of 30 patients) in whom attempted, without complications. In total, 13 patients received an ICD implantation. During a median follow-up of 58 months (Q1-Q3: 30-99 months), 4 patients (4%) had VT, all after ablation failure. According to clinical risk score, AHA 2018 guidelines without LGE-CMR information, AHA 2018 guidelines with LGE-CMR information, and ESC 2022 guidelines, 49 (51%), 24 (25%), 31 (32%), and 48 patients (49%) would have qualified for ICDs, respectively. After proactive mapping and preventive ablation, 11 patients (11%) remained ICD candidates, including all 4 with a VT event during the follow-up (annual VT risk 7%/y). Long-term outcome of rTOF patients without SCAI is excellent. Proactive electroanatomical mapping and preventive SCAI ablation may significantly reduce primary prevention ICD implantation rates compared with current risk prediction methods. [Display omitted]
In patients with repaired tetralogy of Fallot (rTOF) and spontaneous ventricular tachycardia (VT), transection of slow-conducting anatomical isthmus (SCAI) by ablation results in excellent long-term VT-free survival. In patients without prior VT, proactive electroanatomical mapping and preventive SCAI ablation may impact patient selection for primary prevention implantable cardioverter-defibrillator (ICD) implantation. The purpose of this study was to evaluate long-term outcomes after proactive electroanatomical mapping and ablation of SCAI and its impact on patient selection for primary prevention ICD implantation, compared with current risk stratification methods in rTOF patients without prior VT. Consecutive rTOF patients without prior VT who underwent electroanatomical mapping for VT substrate identification were included (2005-2020). After successful SCAI ablation, ICD implantation was offered but was subject to shared decision making. The potential eligibility for ICD implantation was retrospectively determined using the following: 1) a clinical risk score; 2) guideline-recommended risk factors (American Heart Association [AHA] 2018 guidelines without late gadolinium enhancement [LGE] on cardiac magnetic resonance [CMR] information, AHA 2018 guidelines with LGE-CMR information, European Society of Cardiology [ESC] 2022 guidelines); and 3) electroanatomical mapping and SCAI ablation results. In the latter, patients with a nontransected SCAI, VT substrates remote from anatomical isthmuses, or severe right-/left ventricular dysfunction qualified for ICDs. A total of 97 patients were included (age 35 ± 16 years, 57 men); 33 patients (34%) had SCAI and 19 (20%) had inducible monomorphic VT (17 of 19 SCAI-dependent VT). Successful SCAI transection was achieved in 87% (26 of 30 patients) in whom attempted, without complications. In total, 13 patients received an ICD implantation. During a median follow-up of 58 months (Q1-Q3: 30-99 months), 4 patients (4%) had VT, all after ablation failure. According to clinical risk score, AHA 2018 guidelines without LGE-CMR information, AHA 2018 guidelines with LGE-CMR information, and ESC 2022 guidelines, 49 (51%), 24 (25%), 31 (32%), and 48 patients (49%) would have qualified for ICDs, respectively. After proactive mapping and preventive ablation, 11 patients (11%) remained ICD candidates, including all 4 with a VT event during the follow-up (annual VT risk 7%/y). Long-term outcome of rTOF patients without SCAI is excellent. Proactive electroanatomical mapping and preventive SCAI ablation may significantly reduce primary prevention ICD implantation rates compared with current risk prediction methods.
Author Bokma, Jouke P.
Brouwer, Charlotte
Blom, Nico A.
Wallet, Justin
Bertels, Robin A.
Jongbloed, Monique R.M.
Zeppenfeld, Katja
Kimura, Yoshitaka
Hazekamp, Mark G.
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  organization: Department of Cardiology, Leiden University Medical Centre, Leiden, the Netherlands
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  surname: Bokma
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Issue 17
Keywords AI
catheter ablation
ICD
LGE
tetralogy of Fallot
rTOF
FQRS
PVR
EAM
ventricular tachycardia
congenital heart disease
anatomical isthmus
implantable cardioverter-defibrillator
SCAI
SMVT
VT
electroanatomical mapping
pulmonary valve replacement
slow-conducting anatomical isthmus
fragmented QRS complex
repaired tetralogy of Fallot
late gadolinium enhancement
sustained monomorphic ventricular tachycardia
Language English
License Copyright © 2025 American College of Cardiology Foundation. Published by Elsevier Inc. All rights reserved.
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Snippet In patients with repaired tetralogy of Fallot (rTOF) and spontaneous ventricular tachycardia (VT), transection of slow-conducting anatomical isthmus (SCAI) by...
AbstractBackgroundIn patients with repaired tetralogy of Fallot (rTOF) and spontaneous ventricular tachycardia (VT), transection of slow-conducting anatomical...
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pubmed
crossref
elsevier
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Index Database
Publisher
StartPage 1695
SubjectTerms Adult
anatomical isthmus
Cardiovascular
catheter ablation
Catheter Ablation - methods
congenital heart disease
Defibrillators, Implantable - statistics & numerical data
Female
Humans
implantable cardioverter-defibrillator
Male
Middle Aged
Primary Prevention - methods
Retrospective Studies
Tachycardia, Ventricular - etiology
Tachycardia, Ventricular - prevention & control
Tachycardia, Ventricular - therapy
tetralogy of Fallot
Tetralogy of Fallot - complications
Tetralogy of Fallot - physiopathology
Tetralogy of Fallot - surgery
ventricular tachycardia
Title Proactive Mapping and Preventive Ablation Reduce Defibrillator Implantation Rates in Tetralogy of Fallot
URI https://www.clinicalkey.com/#!/content/1-s2.0-S0735109725060140
https://www.clinicalkey.es/playcontent/1-s2.0-S0735109725060140
https://dx.doi.org/10.1016/j.jacc.2025.03.523
https://www.ncbi.nlm.nih.gov/pubmed/40306842
https://www.proquest.com/docview/3198304809
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