Key result
High-density mapping VT ablation in IHD achieves ~90% freedom from appropriate ICD shocks at one year.
Why the study?
The authors sought to report outcomes after a single radiofrequency catheter ablation procedure for ventricular tachycardia in patients with ischemic heart disease using a high-density substrate-based approach.
Does a high-density mapping substrate-based approach for radiofrequency catheter ablation improve survival free from appropriate ICD shocks in patients with ischemic heart disease and ventricular tachycardia?
Cohort (n=64)
No
Does a high-density mapping substrate-based approach for radiofrequency catheter ablation improve survival free from appropriate ICD shocks in patients with ischemic heart disease and ventricular tachycardia?
Radiofrequency catheter ablation using a high-density mapping substrate-based approach in patients with ischemic heart disease provides high rates of freedom from appropriate ICD shocks and VT storm at up to two years.
Answers are grounded in this paper and cite their sources.
Associated with high ICD shock freedom in ischemic VT; hypothesis-generating, requiring RCTs before practice change.
Radiofrequency catheter ablation (RCA) for ventricular tachycardia (VT) in patients with ischemic heart disease (IHD) is associated with a reduced risk of VT storm and implantable cardioverter defibrillator (ICD) shocks. We aim to report the outcome after a single RCA procedure for VT in patients with IHD using a high-density substrate-based approach. We conducted a prospective, observational, single-center and single-arm study involving patients with IHD, referred for RCA procedure for VT using high-density mapping catheters. Substrate mapping was performed in all patients. Procedural endpoints were VT non-inducibility and local abnormal ventricular activities (LAVAs) elimination. The primary end point was survival free from appropriate ICD shocks and secondary end points included VT storm and all-cause mortality. Sixty-four consecutive patients were included (68±9 years, 95% male, mean ejection fraction 33±11%, 39% VT storms, and 69% appropriate ICD shocks). LAVAs were identified in all patients and VT inducibility was found in 83%. LAVA elimination and non-inducibility were achieved in 93.8% and 60%, respectively. After a mean follow-up of 25±18 months, 90% and 85% of patients are free from appropriate ICD shocks at one and two years, respectively. The proportion of patients experiencing VT storm decreased from 39% to 1.6%. Overall survival was 89% and 84% at one and two years, respectively. RCA of VT in IHD using a high-density mapping substrate-based approach resulted in a steady freedom of ICD shocks and VT storm. A ablação por cateter de radiofrequência (ACR) de taquicardia ventricular (TV) em doentes com cardiopatia isquémica (CI) associa-se a redução do risco de tempestade arrítmica (TA) e choques de cardioversor-desfibrihador implantável (CDI). Pretendemos descrever o resultado após procedimento único de ACR de TV na CI utilizando mapeamento de substrato de alta densidade. Estudo prospetivo, observacional, unicêntrico e de braço único, envolvendo doentes com CI, referenciados para ACR de TV utilizando cateteres de mapeamento de alta densidade. Os objetivos do procedimento foram a não indutibilidade de TV e a eliminação de atividades ventriculares anómalas locais (LAVAs). O resultado primário foi a análise da sobrevivência livre de choques de CDI apropriados e os resultados secundários incluíram a TA e mortalidade global. Foram incluídos 64 doentes consecutivos. Identificaram-se LAVAs em todos os doentes e verificou-se indutibilidade de TV em 83%. A eliminação de LAVAs e a não indutibilidade foram alcançadas em 93,8% e 60%, respetivamente. Após um seguimento médio de 25 ± 18 meses, a sobrevida livre de choques apropriados de CDI a um e dois anos foi de 90% e 85%, respetivamente. A incidência de doentes com TA diminuiu de 39% para 1,6%. A sobrevida global a um e dois anos foi de 89% e 84%, respetivamente. A ACR de TV na CI, utilizando um procedimento baseado em mapeamento de substrato de alta densidade, associou-se a uma redução consistente dos choques de CDI e TA.
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Silva et al. (2022) conducted a cohort in Ventricular tachycardia in ischemic heart disease (n=64). Radiofrequency catheter ablation using a high-density mapping substrate-based approach was evaluated on Survival free from appropriate ICD shocks. Radiofrequency catheter ablation of ventricular tachycardia in ischemic heart disease using high-density mapping resulted in 90% and 85% freedom from appropriate ICD shocks at 1 and 2 years.
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