Non-invasive Mapping of Rhythm Disorders (CARRY)

This current care protocol follows the biomedical research protocol entitled "Non-invasive mapping of the heart ECG high amplification" that demonstrated the clinical value of noninvasive Cardioinsight® mapping system.

Guide the management of patients hospitalized for cardiac rhythm radiofrequency ablation of cardiac arrhythmias, implantation or programming of a pacemaker, or assess the risk of serious arrhythmias or sudden death, with the currently used non-invasive mapping routine. The results obtained with non-invasive mapping will be compared with those obtained with the conventional method without non-invasive mapping.

Study Overview

• Status: Completed
• Conditions: Cardiac Rhythm Disorders
• Intervention / Treatment: Device: Cardioinsight® mapping system; Other: Conventional method without non-invasive mapping

Detailed Description

This current care protocol is for 3 groups of patients :

1. Role of mapping arrhythmias before radiofrequency ablation :

   Radiofrequency ablation is a treatment of atrial or ventricular arrhythmias resistant to drug treatment. The electrocardiogram does not allow a full diagnosis of arrhythmias and it appears difficult to get a comprehensive and simultaneous view of cardiac activity during invasive maps. The Investigators have demonstrated the feasibility of mapping atrial fibrillation and its usefulness to guide radiofrequency ablation. The non-invasive mapping would allow a better understanding of complex cardiac arrhythmias mechanism (atrial fibrillation, ventricular tachycardia and ventricular fibrillation in particular), would identify the arrhythmogenic sites and thus facilitate radiofrequency ablation.

2. Optimizing the site of implantation of cardiac pacing leads and programming the pacemaker:

   The optimal position of the cardiac pacing leads may vary from one patient to another and the current choice of implantation sites is essentially guided by imaging and does not use power requirements because of the inadequacies of the ECG standard. The Investigators have already demonstrated the usefulness of non-invasive mapping in the selection of potential responders to cardiac resynchronization therapy. The non-invasive mapping would study the cardiac electrical activation in order to determine the optimal pacing sites and optimum programming according to each patient and thus improve the clinical response to pacing.

3. Role diagnostic and prognostic for patients referred for evaluation of the risk of occurrence of a serious rhythm disorder or sudden death :

The possibility to identify electrically abnormal areas either during the activation, or during cardiac repolarization with the high-resolution ECG is an indication of myocardial pathology that can be both unapparent on standard ECG and inaccessible to imaging techniques (ultrasound, CT or MRI). It is likely that such electrical anomalies are early diagnostic features of heart disease that will later be apparent. Such anomalies can also have an adverse prognostic weight (risk of arrhythmias or sudden death) that can be corrected if it is highlighted. Non-invasive mapping seems particularly important in patients with unexplained symptoms by conventional tests (palpitations or discomfort - syncope). It will also be applicable to patients with heart disease (myocardial infarction, cardiomyopathy) in search of localized electrical disorders that can be an originating site of arrhythmia.

• Study Type: Interventional
• Enrollment (Actual): 492
• Phase: Not Applicable

Contacts and Locations

Study Locations

• France
  • Bordeaux, France, 33000
    • CHU de Bordeaux

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 15 years and older (Child, Adult, Older Adult)
• Accepts Healthy Volunteers: No

Description

Inclusion Criteria:

• Oral agreement of the patient or of the holder of parental responsibility after reading the informed consent form.
• Patients with the following 3 conditions :
• Ablation of drugs rebels arrhythmias.
• Or implantation or programming of a pacemaker (pacemaker or defibrillator)
• Or symptoms and / or cardiopathy with risk of sudden death.

Exclusion Criteria:

• Pregnancy and lactation.
• Patients unable to give oral agreement.
• Inconsistent patient's morphology with the establishment of the electrode jacket

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Prevention
• Allocation: Non-Randomized
• Interventional Model: Parallel Assignment
• Masking: None (Open Label)

Number of Arms

6

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: Group 1 : Cardiac rythm radiofrequency ablation; Prospective recruitment	Device: Cardioinsight® mapping system
Experimental: Group 1: Implantation or programming of a pacemaker; Prospective recruitment	Device: Cardioinsight® mapping system
Experimental: Group 1: Risk of serious arrhythmias or sudden death; Prospective recruitment	Device: Cardioinsight® mapping system
Active Comparator: Group 2: Cardiac rythm radiofrequency ablation; Retrospective recruitment	Other: Conventional method without non-invasive mapping
Active Comparator: Group 2 : Implantation or programming of a pacemaker; Retrospective recruitment	Other: Conventional method without non-invasive mapping
Active Comparator: Group 2 : Risk of serious arrhythmias or sudden death; Retrospective recruitment	Other: Conventional method without non-invasive mapping

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Arrhythmia termination during ablation guided by the Cardioinsight® mapping system		Day 1
Variation of dP/dT measurement between baseline and after implantation or programmation of a pacemaker guided by the Cardioinsight® mapping system	In mmHg/s	Day 1
Measurement of the activation-recovery interval defined as the interval between a local depolarization time and repolarization time for patients referred for evaluation of the risk of occurrence of a serious rhythm disorder or sudden death	In ms	Day 1

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Arrhythmia recurrence at 1 year after ablation guided by the Cardioinsight® mapping system		Year 1
For patients referred for implantation or programming of a pacemaker: Comparison of 6 Minutes Walk Test performed before and 6 months after implantation and/or programmation guided by the Cardioinsight® mapping system	In meters	Month 6
For patients referred for implantation or programming of a pacemaker: Comparison of left ventricular ejection fraction performed before and 6 months after implantation and/or programmation guided by the Cardioinsight® mapping system	In percentage	Month 6
Occurence of syncope, aborted sudden death or sudden death during follow-up for patients referred for evaluation of the risk of occurrence of a serious rhythm disorder or sudden death		Year 1, year 4 at most

Collaborators and Investigators

• Sponsor: University Hospital, Bordeaux
• Investigators: Principal Investigator: Michel HAÏSSAGUERRE, Pr, University Hospital, Bordeaux

Publications and helpful links

General Publications

• Zhang J, Hocini M, Strom M, Cuculich PS, Cooper DH, Sacher F, Haissaguerre M, Rudy Y. The Electrophysiological Substrate of Early Repolarization Syndrome: Noninvasive Mapping in Patients. JACC Clin Electrophysiol. 2017 Aug;3(8):894-904. doi: 10.1016/j.jacep.2016.12.017.

Study record dates

Study Major Dates

• Study Start (Actual): May 19, 2015
• Primary Completion (Actual): May 1, 2019
• Study Completion (Actual): May 28, 2020

Study Registration Dates

• First Submitted: November 5, 2015
• First Submitted That Met QC Criteria: January 4, 2016
• First Posted (Estimated): January 6, 2016

Study Record Updates

• Last Update Posted (Actual): May 14, 2026
• Last Update Submitted That Met QC Criteria: May 11, 2026
• Last Verified: February 1, 2022

More Information

Terms related to this study

• Additional Relevant MeSH Terms: Pathologic Processes; Heart Diseases; Cardiovascular Diseases; Arrhythmias, Cardiac
• Other Study ID Numbers: CHUBX 2015/01