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'Understanding the Electrophysiological Substrate Underlying Persistent Atrial Fibrillation Study II (USURP AF- Study II)'

NCT04041778 · Status: COMPLETED · Type: OBSERVATIONAL · Enrollment: 17

Last updated 2025-10-01

No results posted yet for this study

Summary

Atrial fibrillation (AF) is the most common type of chronic heart rhythm disease worldwide, with significant associated co-morbidities. Although there have been advances in understanding the mechanisms of AF, the underlying cause of AF and factors which perpetuate it remain incompletely understood. This is particularly the case for persistent AF (persAF). Drug treatments for persAF have a role but can have undesirable side effects with relatively limited efficacy. Furthermore, current invasive therapies for persAF remain suboptimal, requiring significant resources, and with potentially serious complications for patients.

Catheter ablation is an effective treatment for paroxysmal AF. For persistent AF (persAF), however, catheter ablation does not provide similar results. This is because there remains a poor understanding of the electrophysiological mechanisms driving persAF. Part of this study aims to further explore the specific locations that represent important substrates which would guide more effective catheter ablation. There have been several different ablation approaches explored in the past (see below), however, these did not improve the outcome post procedure compared with pulmonary vein isolation alone. A pilot study has already been carried out and I aim to expand this further with a larger cohort of patients (10-20) over 2 years. In this study the investigators want to explore whether stable high dominant frequency (HDF) sites (with a high organisation index) act as potential drivers of Atrial Fibrillation. Thus, targeting these sites may results in prolongation of the cycle length and thus possible termination of the arrhythmia.

Conditions

  • Atrial Fibrillation Mechanisms
  • Persistent Atrial Fibrillation
  • Substrate Ablation
  • Pulmonary Vein Isolation
  • Non-contact Mapping

Interventions

OTHER

Catheter ablation

Substrate ablation. Pulmonary vein isolation.

Sponsors & Collaborators

  • University of Leicester

    lead OTHER

Principal Investigators

  • Ghulam Andre Ng, MBChB, PhD. · Professor of Electrophysiology University Hospitals Leicester

Eligibility

Min Age
18 Years
Sex
ALL
Healthy Volunteers
No

Timeline & Regulatory

Start
2019-07-25
Primary Completion
2024-09-30
Completion
2024-09-30

Countries

  • United Kingdom

Study Locations

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Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT04041778 on ClinicalTrials.gov