The SoundScar Study The SOUNDSCAR Study

Completed

• Conditions: Ventricular Tachycardia; Ischemic Cardiomyopathy

• Registration Number: NCT03862339
• Lead Sponsor: Liverpool Heart and Chest Hospital NHS Foundation Trust

Brief Summary

Prospective, Non-randomized, Single-arm Study to assess the accuracy of intracardiac echocardiography (ICE) for characterization of arrhythmogenic substrate in patients with ischaemic cardiomyopathy undergoing ventricular tachycardia (VT) ablation

Detailed Description

ICE imaging during VT ablation is currently largely used for definition of cardiac anatomy. The role of the technique to specifically define scar and arrhythmogenic substrate has not been systematically evaluated. The aim is to assess the efficacy of the technique to accurately define the arrhythmogenic substrate.

Study Timeline

• Study Start: 2018-11-09
• Study First Submitted: 2019-02-25
• Study First Submitted QC: 2019-03-04
• Study First Posted: 2019-03-05
• Primary Completion: 2021-04-01
• Study Completion: 2021-04-01
• Status Verified: 2023-10
• Last Update Submitted: 2023-10-03
• Last Update Posted: 2023-10-04

Recruitment & Eligibility

• Status: COMPLETED
• Sex: All
• Target Recruitment: 38

Inclusion Criteria

• Prior heart attack (myocardial infarction) with evidence from prior non-invasive imaging demonstrating regions of the heart with reduced heart muscle function (myocardial hypokinesia/akinesia/thinning) in the absence of a non-heart attack-related (non-ischaemic) cause
• Age over 18 years
• One of the following abnormal heart rhythm (VT) events within last 6 months:
• ≥3 episodes of VT treated with therapeutic rapid pacing from an implantable cardiac defibrillator (antitachycardia pacing [ATP])
• ≥1 appropriate shocks from an implantable cardiac defibrillator
• ≥3 episodes of abnormal heart rhythm (VT) within 24 hours
• Sustained VT below the detection rate of the implantable cardiac defibrillator (documented by ECG/cardiac monitor)
• Sustained abnormal heart rhythm (VT) in the absence of ICD which is documented by ECG/cardiac monitor
• Patients in whom ICE imaging is planned for the clinical VT ablation procedure (clinical indication)

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Exclusion Criteria

• Patient unable or unwilling to provide informed consent.
• Acute heart attack (acute coronary syndrome with acute thrombus diagnosed by coronary angiography, or dynamic ST segment changes demonstrated on ECG) or another reversible cause of abnormal heart rhythm (VT) - e.g. electrolyte abnormalities or drug-induced abnormal heart rhythms
• Ineligible for ablation (known to have protruding clot in the chamber of interest (left ventricular thrombus), or have implanted mechanical aortic and mitral valves)
• Had recent coronary bypass surgery (< 3 months) or percutaneous coronary intervention (<3 months)
• Pregnant patients (pregnancy test will be performed in patients who are of childbearing age who are not on an effective contraceptive prior to all VT ablation procedures)
• Had recent coronary bypass surgery (< 3 months) or percutaneous coronary intervention (<3 months)

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Study & Design

• Study Type: OBSERVATIONAL
• Study Design: Not specified

Primary Outcome Measures

Name	Time	Method
Areas of abnormal contraction (hypokinesia/akinesia) as determined by ICE imaging	1 week	Area with abnormal contraction as correlated the findings on voltage mapping (low voltage) of the left ventricle in patients with a prior myocardial infarction undergoing VT ablation.

Secondary Outcome Measures

Name	Time	Method
Areas of abnormal contraction as determined by ICE imaging	1 week	Area of abnormal contraction correlating with the findings on voltage mapping (local abnormal ventricular activities) of the left ventricle in patients with a prior myocardial infarction undergoing VT ablation

Trial Locations

Locations (2)

Liverpool Heart and Chest Hospital NHS Trust; 🇬🇧 Liverpool, United Kingdom

Westmead Hospital; 🇦🇺 Sydney, New South Wales, Australia