13 documents found, page 1 of 2

Protection against direct atmospheric discharges and overvoltages in photovolta...

The increasing global energy demand has led to the expansion of photovoltaic (PV) power plants, particularly in response to climate goals like the European Union's "Fit for 55" initiative to reduce CO2 emissions by 55% by 2030. However, as PV installations grow, their vulnerability to atmospheric discharges, such as lightning, also increases. This study investigates the design and dimensioning of lightning prot...

Ostial vs. wide area circumferential ablation guided by the Ablation Index in p...

Pulmonary vein isolation (PVI) guided by the Ablation Index (AI) has shown high acute and mid-term efficacy in the treatment of paroxysmal atrial fibrillation (AF). Previous data before the AI-era had suggested that wide-area circumferential ablation (WACA) was preferable to ostial ablation. However, with the use of AI, we hypothesize that ostial circumferential ablation is non-inferior to WACA and can improve ...

Multielectrode mapping for premature ventricular contraction ablation: a prospe...

Purpose: We aim to evaluate whether the use of a multielectrode mapping catheter could lead to higher efficacy of premature ventricular contraction (PVC) ablation. Methods: Prospective, multicenter nonrandomized study of consecutive patients referred for PVC ablation from January 2018 to June 2021. Patients were separated into two groups: activation map performed with the PentaRay catheter (Study group) or with...

Impact of the COVID-19 lockdown in urgent pacemaker implantations: A cross-sect...

Aims: The COVID-19 pandemic resulted in a decrease in patients' follow-up and interventions with cardiovascular disease. In Portugal, the consequences on emergent pacemaker implantation rates are largely unknown. We sought to analyze the impact of the COVID-19 pandemic on emergent pacemaker implantation rate and patient profile. Methods: We retrospectively reviewed the clinical profile of the 180 patients who h...

Two years after pulmonary vein isolation guided by ablation index—a multicenter...

Background: The use of the Ablation Index (AI) software for paroxysmal atrial fibril-lation (AF) has been associated with higher acute effectiveness and higher 1-year ar -rhythmia freedom. There is, however, a lack of data concerning longer follow-up. We aim to evaluate the 2-year outcomes after a standardized AI- guided pulmonary vein isolation (PVI).Methods: Prospective, multicenter study of consecutive patie...

Impact of catheter ablation for atrial fibrillation in patients with heart fail...

Introduction and Aims: Catheter ablation has been shown to improve left ventricular (LV) ejection fraction (LVEF) in patients with atrial fibrillation (AF) and heart failure (HF). Our aim was to assess the impact of AF ablation on the outcome of patients with HF and LV systolic dysfunction. Methods: We performed a retrospective observational cohort study of all patients with HF and LVEF <50% and with no apparen...

Pattern Matching Filter and multielectrode mapping catheter – A new approach fo...

Purpose: Our goal was to assess usefulness of Pattern Matching Filter (PMF) software combined with the PentaRay catheter for complex premature ventricular contraction (PVC) ablation. Methods: A prospective observational study of consecutive patients referred for complex PVC ablation at our tertiary center from January to September 2018. Patients underwent ablation using a pre-specified mapping strategy with the...

Improvement in circulating endothelial progenitor cells pool after cardiac resy...

Background: Recent studies suggest that circulating endothelial progenitor cells (EPCs) may influence the response to cardiac resynchronization therapy (CRT). The aim of this study was to evaluate the effect of CRT on EPC levels and to assess the impact of EPCs on long-term clinical outcomes. Population and methods: Prospective study of 50 patients submitted to CRT. Two populations of circulating EPCs were quan...

Impact of cardiac resynchronization therapy on circulating IL-17 producing cell...

IL-17-producing T cells have been implicated in the inflammatory milieu of chronic heart failure (CHF), which implies a dismal prognosis in affected patients. The aim of this study was to evaluate the impact of cardiac resynchronization therapy (CRT) on the frequency and functional activity of Th17 and Tc17 cells, as well as, on IL-17 mRNA expression in patients with CHF.

Constrictive pericarditis following atrial fibrillation ablation - A rare compl...