Pulsed Field Ablation for Cavotricuspid Isthmus Dependent Atrial Flutter Cohort Study
For patients and families
In plain language
An automatic summary of structured registry data. It is an orientation aid, not a substitute for the official protocol or a physician assessment.
- What is being studied
- The protocol lists: CTI ablation.
- Who it may be relevant to
- Registry conditions: Cavotricuspid Isthmus Dependent Atrial Flutter. Basic parameters: 18 years — 80 years · All.
- What needs checking
- Age, condition and sex are only basic indicators. Prior treatment, laboratory values and other mandatory requirements appear in the eligibility criteria below.
- Where it takes place
- Hong Kong
- Next step
- Save the trial, show it to the treating physician, and confirm current recruitment with the study center. Costs, documents and travel →
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Overview
Pulsed field ablation (PFA) has been demonstrated to be safe and effective in achieving pulmonary vein isolation in patients with atrial fibrillation (AF). Coexisting atrial flutter is common in patients with AF. It is therefore appealing to treat the atrial futters with PFA. The use of PFA for extra-pulmonary ablation, such as linear ablation at the mitral or cavo-tricuspid isthmus (CTI) has been investigated. When PFA is applied near a coronary vessel, acute coronary spasm is a common observation, which has been reported to be reversible and largely mitigated by pre-emptive intravenous or intracoronary nitroglycerine (TNG) injection. A recent clinical study based on qualitative coronary angiogram reported no apparent coronary stenosis 6 months after PFA. However, quantitative measurements were not provided. While acute conduction block is easy to create with pulsed field ablation catheters, the long-term lesion durability is unknown. The circular array pulsed field ablation catheter was shown to be safe and effective in achieving pulmonary vein isolation. This study aims to evaluate the safety and efficacy of pulsed-field ablation for CTI flutters. This study will be a multicenter prospective cohort study involving 30 patients undergoing ablation for atrial fibrillation and CTI flutter. The decision for ablation will be a clinical decision based on existing class I and II guideline recommendations. The atrial fibrillation ablation procedure will be performed as per routine clinical practice. Procedure will be performed with a 3-D electro-anatomical system guidance. Pulmonary vein isolation (PVI) will be performed with pulsed field ablation with a circular array catheter (Pulse Select system, Medtronic). After confirming PVI, extrapulmonary ablation will be performed per clinically need. CTI ablation will be performed with PFA as planned. Patient will be managed by usual clinical care after ablation. They will come back for follow up at 3 months for a remapping procedure. During the remapping procedure, a RCA coronary angiogram will be performed to exclude late coronary damage. A multipolar catheter will be inserted via right femoral vein to check for conduction block across CTI. If there is ongoing conduction, a repeat ablation will be performed with radiofrequency ablation.
Interventions
- Device CTI ablation
CTI ablation will be performed with PFA. Before ablation, The RA geometry will be created with a multipolar catheter. Coronary angiogram will be performed at baseline in LAO 45 degree before and after each set of ablations. After ablation, a 15-minute waiting period will be mandated. The CTI block will be rechecked with 3D mapping system and multipolar catheter. If there is persistent CTI conduction, ablation will be repeated until CTI block is achieved. This will be followed by another 15 minut
Primary outcome measures
- Rate of residual conduction [Time frame: In 3 months follow up]
- Rate of coronary artery damage [Time frame: In 3 months follow up]
- Rate of acute severe coronary spasm [Time frame: In 3 months follow up]
Secondary outcome measures (5)
- Rate of clinical recurrence of atrial arrhythmia [Time frame: In 3 months follow up]
- Number of PFA applications [Time frame: In ablation procedure]
- Rate of successful acute conduction block by PFA alone [Time frame: In ablation procedure]
- Rate of successful acute conduction block in all patients (with PFA or PFA + RFA) [Time frame: In ablation procedure]
- Number of mapping points in right atrium in electroanatomic system [Time frame: In mapping procedure]
Eligibility criteria
Inclusion criteria
1\. Patients with atrial fibrillation who are clinically planned to undergo AF ablation and atrial flutter ablation per guideline recommendations
Exclusion criteria
- >80 years old or <18 years old
- Known severe coronary artery disease
- Prior history of atrial flutter or atrial fibrillation ablation
- Refusal for remapping or coronary angiogram
- Contraindication for coronary angiogram
- Pregnancy
- Expected life expectancy <1 year
- Inability to provide informed consent
Criteria are shown verbatim from the registry (in English). Final eligibility is always assessed by the study center.
Healthy volunteers: No
Study design
- Allocation
- N/A
- Model
- Single group
- Masking
- Open label
- Primary purpose
- Treatment
Study locations
Hong Kong · 1 center
- Prince of Wales Hospital — Hong Kong
Identifiers
NCT: NCT07012460 · Pulse CTI study