Magnetic Resonance Imaging Based Risk Stratification for Defibrillator Implantation in Heart Failure Patients Requiring Cardiac Resynchronisation Therapy (MADURAI CRT)

August 25, 2026 updated by: Shunmuga Sundaram Ponnusamy MD, Velammal Medical College Hospital and Research Institute

Magnetic Resonance Imaging Based Risk Stratification for Defibrillator Implantation in Heart Failure Patients Requiring Cardiac Resynchronization Therapy (MADURAI CRT)

This randomized study aimed to compare the efficacy of LBBP without defibrillator vs biventricular pacing with defibrillator (BiV-ICD/CRT-D) in patients with LB-NICM and left ventricular ejection fraction (LVEF) ≤35% risk categorized by CMR imaging.

Study Overview

Status

Recruiting

Conditions

Intervention / Treatment

Detailed Description

This is a single centre, prospective, randomized study in which patients with LB-NICM, LVEF ≤35% and heart failure despite guideline directed medical therapy (GDMT) will be included. CMR with gadolinium contrast will be performed to risk categorize the patient into low-risk or high risk based on presence of scar. Low risk patients (without scar ?<5%) will be randomized in 1:1 fashion to receive either LBBP without defibrillator or traditional CRT-D with biventricular pacing. LBBP will be performed by premature ventricular complex guided approach with 3830 selectsecure lead and C315His sheath in the proximal interventricular septum 1.5-2 cm distal to His bundle. LBB capture will be confirmed as per standard criteria. If LBBP lead implantation is unsuccessful, a coronary sinus lead will be placed to achieve biventricular pacing. In patients randomized to BiV-ICD, left ventricular lead will be placed in the postero-lateral branch of the coronary sinus with Q-LV duration of >90ms. If coronary sinus lead placement is unsuccessful, a LBBP lead will be implanted. The defibrillator lead will deployed in the right ventricular apical septum.

Study Type

Interventional

Enrollment (Estimated)

114

Phase

  • Not Applicable

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Study Locations

  • India
    • Tamil Nadu
      • Madurai, Tamil Nadu, India, 625009
        • Recruiting
        • Velammal Medical College Hospital and Research Institute
        • Contact:

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  1. Patients with age ≥18 years
  2. Typical left bundle branch block as defined by Strauss criteria with LVEF ≤35%
  3. Heart failure symptoms despite guideline directed medical therapy (GDMT)

Exclusion Criteria:

  1. Patients with angiographic evidence of significant coronary artery disease requiring revascularisation. In patients with significant CAD, LVEF will be re-assessed 3 months after revascularisation to decide about CRT
  2. Patients with associated uncorrected congenital or valvular heart disease
  3. Expected life-expectance of <12 months due to associated comorbidities
  4. Patients with contrast allergy
  5. Baseline non-LBBB morphology
  6. Renal dysfunction which limits the acquisition of CMR with contrast
  7. Pregnant or lactating women
  8. Patients who are unable to comply with study protocol

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

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

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: LBBP without defibrillator:
Left bundle branch pacing along with right atrial pacing
Device: left bundle branch pacing
Capture of left bundle branch fibers by positioning the lead deep inside the proximal inter ventricular septum. Atrial lead will positioned in the right atrium
Active Comparator: BiV-ICD
Biventricular pacing with defibrillator lead using RV-ICD lead, LV lead and atrial lead
Device: Biventricular pacing with defibrillator
Biventricular pacing with right ventricular ICD lead and coronary sinus lead. Atrial lead will be positioned in the right atrium

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Number of participants with the following treatment related events in each arm
Time Frame: 12 months

  1. Composite of occurrence

    1. death,
    2. HFH, or
    3. sustained VT at 12 months
  2. Echocardiographic response (ER) defined as absolute increase in LVEF by >15% at 12 months
12 months

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Number of participants with the following treatment related events in each arm
Time Frame: 6 and 12 months
  1. Echocardiographic hyper-response (EHR) defined as normalisation of LVEF (≥50%) at 6 and 12 months
  2. Need for ICD upgrade (persistent LVEF <35% or sustained VT/VF) at 12 months
6 and 12 months

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Velammal Medical College Hospital and Research Institute

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Estimated)

August 1, 2026

Primary Completion (Estimated)

July 15, 2027

Study Completion (Estimated)

July 15, 2028

Study Registration Dates

First Submitted

July 12, 2026

First Submitted That Met QC Criteria

August 25, 2026

First Posted (Actual)

August 27, 2026

Study Record Updates

Last Update Posted (Actual)

August 27, 2026

Last Update Submitted That Met QC Criteria

August 25, 2026

Last Verified

August 1, 2026

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • MADURAI CRT

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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