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Efficacy and Safety of Appropriate Shocks and Antitachycardia Pacing in Transvenous and Subcutaneous Implantable Defibrillators: Analysis of All Appropriate Therapy in the PRAETORIAN Trial

RE. Knops, W. van der Stuijt, PPHM. Delnoy, LVA. Boersma, J. Kuschyk, MF. El-Chami, H. Bonnemeier, ER. Behr, TF. Brouwer, S. Kääb, S. Mittal, ABE. Quast, L. Smeding, JGP. Tijssen, NR. Bijsterveld, S. Richter, MA. Brouwer, JR. de Groot, KM....

. 2022 ; 145 (5) : 321-329. [pub] 20211114

Language English Country United States

Document type Journal Article, Randomized Controlled Trial, Research Support, Non-U.S. Gov't

BACKGROUND: The PRAETORIAN trial (A Prospective, Randomized Comparison of Subcutaneous and Transvenous Implantable Cardioverter Defibrillator Therapy) showed noninferiority of subcutaneous implantable cardioverter defibrillator (S-ICD) compared with transvenous implantable cardioverter defibrillator (TV-ICD) with regard to inappropriate shocks and complications. In contrast to TV-ICD, S-ICD cannot provide antitachycardia pacing for monomorphic ventricular tachycardia. This prespecified secondary analysis evaluates appropriate therapy and whether antitachycardia pacing reduces the number of appropriate shocks. METHODS: The PRAETORIAN trial was an international, investigator-initiated randomized trial that included patients with an indication for implantable cardioverter defibrillator (ICD) therapy. Patients with previous ventricular tachycardia <170 bpm or refractory recurrent monomorphic ventricular tachycardia were excluded. In 39 centers, 849 patients were randomized to receive an S-ICD (n=426) or TV-ICD (n=423) and were followed for a median of 49.1 months. ICD programming was mandated by protocol. Appropriate ICD therapy was defined as therapy for ventricular arrhythmias. Arrhythmias were classified as discrete episodes and storm episodes (≥3 episodes within 24 hours). Analyses were performed in the modified intention-to-treat population. RESULTS: In the S-ICD group, 86 of 426 patients received appropriate therapy, versus 78 of 423 patients in the TV-ICD group, during a median follow-up of 52 months (48-month Kaplan-Meier estimates 19.4% and 17.5%; P=0.45). In the S-ICD group, 83 patients received at least 1 shock, versus 57 patients in the TV-ICD group (48-month Kaplan-Meier estimates 19.2% and 11.5%; P=0.02). Patients in the S-ICD group had a total of 254 shocks, compared with 228 shocks in the TV-ICD group (P=0.68). First shock efficacy was 93.8% in the S-ICD group and 91.6% in the TV-ICD group (P=0.40). The first antitachycardia pacing attempt successfully terminated 46% of all monomorphic ventricular tachycardias, but accelerated the arrhythmia in 9.4%. Ten patients with S-ICD experienced 13 electrical storms, versus 18 patients with TV-ICD with 19 electrical storms. Patients with appropriate therapy had an almost 2-fold increased relative risk of electrical storms in the TV-ICD group compared with the S-ICD group (P=0.05). CONCLUSIONS: In this trial, no difference was observed in shock efficacy of S-ICD compared with TV-ICD. Although patients in the S-ICD group were more likely to receive an ICD shock, the total number of appropriate shocks was not different between the 2 groups. Registration: URL: https://www.clinicaltrials.gov; Unique identifier: NCT01296022.

1st Department of Medicine University Medical Center Mannheim Germany

Cardiac Electrophysiology Division Department of Medicine Englewood Hospital and Medical Center NJ

Center for Arrhythmia Care Heart and Vascular Institute University of Chicago Pritzker School of Medicine IL

CorVita Science Foundation Chicago IL

Department of Cardiology Amphia Hospital Breda The Netherlands

Department of Cardiology and Amsterdam Cardiovascular Sciences Amsterdam UMC Location VUMC Amsterdam The Netherlands

Department of Cardiology Cardiovascular Research Institute Maastricht Maastricht University Medical Center The Netherlands

Department of Cardiology Flevoziekenhuis Almere The Netherlands

Department of Cardiology Homolka Hospital Prague Czech Republic

Department of Cardiology Isala Heart Centre Zwolle The Netherlands

Department of Cardiology OLVG Amsterdam The Netherlands

Department of Cardiology Radboud University Medical Center Nijmegen The Netherlands

Department of Cardiology St Antonius Hospital Nieuwegein The Netherlands

Department of Cardiology Tergooi MC Blaricum The Netherlands

Department of Cardiology The Heart Centre Rigshospitalet University of Copenhagen Denmark

Department of Electrophysiology Catharina Hospital Eindhoven The Netherlands

Department of Electrophysiology Heart Center at University of Leipzig Germany

Department of Internal Medicine 1 Jena University Hospital Germany

Department of Internal Medicine Section of Cardiovascular Medicine Yale University School of Medicine New Haven CT

Department of Medicine 1 Ludwig Maximillians University Hospital München Germany

Department of Medicine Cardiology Columbia University Irving Medical Center New York

Division of Cardiology Northwestern Memorial Hospital Northwestern University Chicago IL

Division of Cardiology Section of Electrophysiology Emory University Atlanta GA

Division of Cardiovascular Medicine College of Medicine The Ohio State University Columbus

European Reference Network for Rare Low Prevalence and Complex Diseases of the Heart ERN GUARD Heart

German Center for Cardiovascular Research Munich Heart Alliance Germany

German Center for Cardiovascular Research Partner Site Heidelberg Mannheim Germany

Heart Center Department of Clinical and Experimental Cardiology Amsterdam Cardiovascular Sciences Amsterdam UMC location AMC The Netherlands

Heart Surgery Heart Center Dresden Carl Gustav Carus Medical Faculty Dresden University of Technology Germany

Icahn School of Medicine at Mount Sinai Mount Sinai Hospital New York

Klinik für Innere Medizin 3 Schwerpunkt Kardiologie und Angiologie Universitätsklinikum Schleswig Holstein Campus Kiel Germany

Liverpool Heart and Chest Hospital United Kingdom

Medical Spectrum Twente Enschede The Netherlands

Medisch Centrum Leeuwarden Leeuwarden The Netherlands

National Heart and Lung Institute Imperial College London United Kingdom

Office of the Director of Clinical Electrophysiology Research and Lead for Inherited Arrhythmia Specialist Services University College London and Barts Heart Centre United Kingdom

Oxford Biomedical Research Centre Oxford University Hospitals NHS Trust United Kingdom

St George's University Hospitals NHS Foundation Trust London United Kingdom

St George's University of London United Kingdom

The Valley Health System Ridgewood NJ

University and University Hospital Würzburg Germany

Werkgroep Cardiologische Centra Nederland Utrecht The Netherlands

References provided by Crossref.org

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$a Efficacy and Safety of Appropriate Shocks and Antitachycardia Pacing in Transvenous and Subcutaneous Implantable Defibrillators: Analysis of All Appropriate Therapy in the PRAETORIAN Trial / $c RE. Knops, W. van der Stuijt, PPHM. Delnoy, LVA. Boersma, J. Kuschyk, MF. El-Chami, H. Bonnemeier, ER. Behr, TF. Brouwer, S. Kääb, S. Mittal, ABE. Quast, L. Smeding, JGP. Tijssen, NR. Bijsterveld, S. Richter, MA. Brouwer, JR. de Groot, KM. Kooiman, PD. Lambiase, P. Neuzil, K. Vernooy, M. Alings, TR. Betts, FALE. Bracke, MC. Burke, JSSG. de Jong, DJ. Wright, WPJ. Jansen, ZI. Whinnet, P. Nordbeck, M. Knaut, BT. Philbert, JM. van Opstal, AB. Chicos, CP. Allaart, AE. Borger van der Burg, JF. Clancy, JM. Dizon, MA. Miller, D. Nemirovsky, R. Surber, GA. Upadhyay, R. Weiss, A. de Weger, AAM. Wilde, LRA. Olde Nordkamp, PRAETORIAN Investigators‡
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