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

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Title: Efficacy and Safety of Appropriate Shocks and Antitachycardia Pacing in Transvenous and Subcutaneous Implantable Defibrillators: An Analysis of All Appropriate Therapy in the PRAETORIAN trial
Authors: Knops, RE, Van der Stuijt, W, Delnoy, PPHM, Boersma, LVA, Kuschyk, J, El-Chami, MF, Bonnemeier, H, Behr, ER, Brouwer, TF, Kaab, S, Mittal, S, Quast, A-FBE, Smeding, L, Tijssen, JGP, Bijsterveld, NR, Richter, S, Brouwer, MA, de Groot, JR, Kooiman, KM, Lambiase, PD, Neuzil, P, Vernooy, K, Alings, M, Betts, TR, Bracke, FALE, Burke, MC, De Jong, JSSG, Wright, DJ, Jansen, WPJ, Whinnett, ZI, Nordbeck, P, Knaut, M, Philbert, BT, van Opstal, JM, Chicos, AB, Allaart, CP, Borger van der Burg, AE, Clancy, JF, Dizon, JM, Miller, MA, Nemirovsky, D, Surber, R, Upadhyay, GA, Weiss, R, De Weger, A, Wilde, AAM, Olde Nordkamp, LRA, PRAETORIAN Investigators
Source: Circulation (2021) (In press).
Publication Year: 2021
Collection: University College London: UCL Discovery
Description: Background: The PRAETORIAN trial showed non-inferiority of the subcutaneous implantable cardioverter-defibrillator (S-ICD) compared to the transvenous ICD (TV-ICD) with regard to inappropriate shocks and complications. In contrast to the TV-ICD, the S-ICD cannot provide antitachycardia pacing (ATP) for monomorphic ventricular tachycardia (VT). This pre-specified secondary analysis evaluates appropriate therapy and whether ATP reduces the number of appropriate shocks. / Methods: The PRAETORIAN trial was an international, investigator-initiated randomized trial, which included patients with an indication for ICD therapy. Patients with prior VTs below 170 bpm or refractory recurrent monomorphic VTs 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, 86/426 patients received appropriate therapy, versus 78/423 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 one 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 to 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 ATP attempt successfully terminated 46% of all monomorphic VTs, but accelerated the arrhythmia in 9.4%. Ten S-ICD patients experienced 13 electrical storms, versus 18 TV-ICD patients with 19 electrical storms. Patients with appropriate therapy had an almost two-fold increased relative risk of electrical storms in ...
Document Type: article in journal/newspaper
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Language: English
Relation: https://discovery.ucl.ac.uk/id/eprint/10139501/1/Lambiase_Efficacy%20and%20Safety%20of%20Appropriate%20Shocks%20and%20Antitachycardia%20Pacing%20in%20Transvenous%20and%20Subcutaneous%20Implantable%20Defibrillators_AAM.pdf; https://discovery.ucl.ac.uk/id/eprint/10139501/
Availability: https://discovery.ucl.ac.uk/id/eprint/10139501/1/Lambiase_Efficacy%20and%20Safety%20of%20Appropriate%20Shocks%20and%20Antitachycardia%20Pacing%20in%20Transvenous%20and%20Subcutaneous%20Implantable%20Defibrillators_AAM.pdf
https://discovery.ucl.ac.uk/id/eprint/10139501/
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  Data: Background: The PRAETORIAN trial showed non-inferiority of the subcutaneous implantable cardioverter-defibrillator (S-ICD) compared to the transvenous ICD (TV-ICD) with regard to inappropriate shocks and complications. In contrast to the TV-ICD, the S-ICD cannot provide antitachycardia pacing (ATP) for monomorphic ventricular tachycardia (VT). This pre-specified secondary analysis evaluates appropriate therapy and whether ATP reduces the number of appropriate shocks. / Methods: The PRAETORIAN trial was an international, investigator-initiated randomized trial, which included patients with an indication for ICD therapy. Patients with prior VTs below 170 bpm or refractory recurrent monomorphic VTs 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, 86/426 patients received appropriate therapy, versus 78/423 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 one 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 to 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 ATP attempt successfully terminated 46% of all monomorphic VTs, but accelerated the arrhythmia in 9.4%. Ten S-ICD patients experienced 13 electrical storms, versus 18 TV-ICD patients with 19 electrical storms. Patients with appropriate therapy had an almost two-fold increased relative risk of electrical storms in ...
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