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Effect of Catheter Ablation on Left Atrial Function in Persistent Atrial Fibrillation

NCT03443232 · Status: COMPLETED · Phase: NA · Type: INTERVENTIONAL · Enrollment: 106

Last updated 2020-03-18

No results posted yet for this study

Summary

A total of 106 patients with drug-refractory persistent atrial fibrillation, who are planned to undergo circumferential pulmonary vein isolation (CPVI), will be randomly allocated into two groups. These patients will receive cryoballoon ablation, radiofrequency ablation under the guidance of 3D mapping respectively (allocation ratio, 1:1). Atrial electrical activity including atrial effective refractory period, atrial conduction time, electromechanical conduction time, P wave dispersion and spatial dispersion of atrial refractory will be measured before and after the operation. Left atrial appendage flow velocity of all patients are measured by Transesophageal Echocardiography(TEE) 24 hours before the operation. Real-time ultrasound examinations of left atrial function are carried out for all patients before the operation and after the operation. Blood samples are extracted in all patients before the operation and after the operation.This study will clarify whether these different operation methods have different effects on the recovery of postoperative left atrial function and electrical activity in patients with persistent atrial fibrillation, and whether changes in left atrial function electrical activity are related to indicators such as inflammation, blood clotting and myocardial injury. Cryoballoons ablation is still less used to operate on persistent atrial fibrillation. To investigate the ablative effect, electrical remodeling and structural remodeling of persist atrial fibrillation with different operating methods. Therefore, the ablation is related indicators such as the success rate of the operation, intraoperative complications, postoperative recurrence rate and the amount of x-ray exposure are compared among two groups. At the same time, biochemical indicators of inflammation, blood clotting and myocardial injury such as blood routine, myocardial enzyme, BNP, troponin I and D-D dimmer are detected to analyze and determine which indicators are related to the postoperative recurrence of atrial fibrillation, the recovery of postoperative left atrial function.

Conditions

  • Persistent Atrial Fibrillation

Interventions

PROCEDURE

Cryoballoon ablation

Cryoablation is performed using a single cryoballoon.In general, the cryoablation of each pulmonary vein is carried out twice. According to the objective condition, the operator determine whether or not to carry out an additional cryoablation. Then we will applicate electrophysiological substrate mapping for guiding ablation of atrial fibrillation,If mapping system detect a poor substrate,we should continue to ablate for left atrial roof and posterior line.

PROCEDURE

Radiofrequency ablation

Each patient randomly allocated into the radiofrequency ablation group receives circumferential pulmonary vein isolation(CPVI),The default strategy is to create a circle surrounding the two ipsilateral pulmonary veins.We will mapping the left atrial subtrate. If mapping system detect a poor substrate,we should continue to ablate for left atrial roof and posterior line.

Sponsors & Collaborators

  • The Second Hospital of Hebei Medical University

    lead OTHER

Study Design

Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
QUADRUPLE
Model
PARALLEL

Eligibility

Max Age
80 Years
Sex
ALL
Healthy Volunteers
No

Timeline & Regulatory

Start
2018-02-16
Primary Completion
2020-03-17
Completion
2020-03-17

Countries

  • China

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 NCT03443232 on ClinicalTrials.gov