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Optimizing CRT With ECGI (optCRT)

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT03492788
Recruitment Status : Terminated (Study lost access to ECGI)
First Posted : April 10, 2018
Last Update Posted : May 1, 2019
American College of Cardiology
Information provided by (Responsible Party):
Washington University School of Medicine

Brief Summary:
CRT is delivered from two electrodes on opposite sides of the heart [right (RV) and left ventricle (LV)] delivering stimulation for more efficient heart beats. There is flexibility in the sequence and temporal staggering of the stimulation from these two electrodes with a different optimum for different patients. However, standard techniques to figure out the optimal stimulation strategy like standard 12-lead surface electrical recording (ECG) or routine ultrasound have failed. The investigators have developed ECG imaging (ECGI) with 250 electrode surface recording combined with CT scan to reconstruct high resolution 4-dimensional panoramic electrical maps of the heart. The study seeks to enroll 56 patients undergoing CRT in a clinical trail to evaluate short and long term impact of using ECGI for optimal programming of CRT.

Condition or disease Intervention/treatment Phase
Heart Failure, Systolic Left Bundle-Branch Block Other: ECGI-optimized VV-offset Other: Zero VV-offset Not Applicable

Detailed Description:

Heart failure (HF) with reduced ejection fraction is a major global health problem. Every year, over 200,000 patients with HF and electrical abnormalities receive device implants for Cardiac Resynchronization Therapy (CRT). However, one-third of these patients receiving CRT fail to clinically improve, a large population with refractory HF symptoms, high mortality, and tremendous healthcare costs. The overall objective of the study is to improve the clinical response to CRT by physiological optimization of CRT programming with individualized ventriculo-ventricular (VV) offset, guided by novel 4-dimensional panoramic electroanatomical heart mapping using Electrocardiographic Imaging (ECGI). ECGI is a high-resolution, non-invasive, validated technique using 250 recording electrodes combined with heart-torso anatomy from chest CT.

Specific Aims:

  1. Assess the acute impact of ECGI-guided CRT optimization on hemodynamic heart function.
  2. Determine the impact of ECGI-guided CRT optimization on reverse heart remodeling at 6 months.


The study will enroll 56 adult patients undergoing CRT for standard clinical indications.

  1. Compare the impact of ECGI-guided CRT optimization vs. standard-of-care (zero VV offset) on acute hemodynamic function i.e. left ventricular stroke volume on Doppler echocardiography.
  2. Randomize patients to (a) ECGI-guided CRT optimization or (b) standard-of-care (zero VV offset). Patients will be crossed-over at 6 months and serve as their own controls. The primary outcome will be the difference in heart remodeling, i.e. % reduction of left ventricular end-systolic volume (LVESV) from baseline, between the two groups after 6 months. Reduction in LVESV is a validated physiological marker of CRT response that strongly predicts lower mortality and HF events. The secondary outcomes will include quality-of-life (Kansas City Cardiomyopathy Questionnaire), functional performance (6-minute hall walk distance) and a prognostic biomarker (serum N-terminal proBNP).

The results of this important study will provide key mechanistic insights on the salutary effects of CRT on reverse heart remodeling and enhance the understanding of failure in CRT response. Physiologically tailored CRT therapy would improve individual patient health by reducing CRT non-responders, and decrease the economic burden of refractory HF.

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Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 3 participants
Allocation: Randomized
Intervention Model: Crossover Assignment
Masking: Double (Participant, Outcomes Assessor)
Primary Purpose: Treatment
Official Title: Optimizing Cardiac Resynchronization Therapy With Electrocardiographic Imaging
Actual Study Start Date : December 28, 2017
Actual Primary Completion Date : October 5, 2018
Actual Study Completion Date : October 5, 2018

Resource links provided by the National Library of Medicine

Arm Intervention/treatment
Active Comparator: ECGI-optimized VV-offset Other: ECGI-optimized VV-offset
ECGI guided optimization of VV offset programming of CRT device

Placebo Comparator: Zero VV-offset Other: Zero VV-offset
Standard-of-care nominal (zero VV-offset) programming of CRT device

Primary Outcome Measures :
  1. LV reverse remodeling [ Time Frame: 6 months ]
    Echocardiographically evaluated % reduction in LV end-systolic volume (LVESV) from baseline is the primary outcome measure. A reduction in the LVESV is a validated surrogate marker of improved HF outcomes including reduced hospitalizations and increased survival.

Secondary Outcome Measures :
  1. Quality-of-life [ Time Frame: 6 months ]
    The validated standardized abbreviated Kansas City Cardiomyopathy Questionnaire-12 (KCCQ-12) is a secondary outcome measure. The KCCQ-12 is a self-reported disease-specific health status measure for patients with HF. The overall summary KCCQ-12 score ranges from 0 (poor) to 100 (excellent) and represents the summation of the patient's physical limitation, symptom frequency, quality of life and social limitation. Improvement in the KCCQ-12 overall summary score as compared to the baseline will be assessed.

  2. Functional performance [ Time Frame: 6 months ]
    A standard six-minute hall walk distance (meters) will be measured at baseline and at followup to assess increase in walking distance as a reproducible measure of functional performance.

  3. Prognostic biomarker [ Time Frame: 6 months ]
    Serum N-terminal proBNP is a validated prognostic biomarker that is elevated with worsening HF and is associated with worse outcomes including mortality. The NT-proBNP level at followup will be compared to baseline as a marker of improvement in heart failure.

Information from the National Library of Medicine

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Ages Eligible for Study:   18 Years to 100 Years   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • Patients ≥18 years of age who are able to give consent, having systolic heart failure despite treatment with guideline directed medical therapy, undergoing successful CRT device implant for standard clinical indications, expected to have over 95% heart beats resynchronized by the pacing device (absence of competing arrhythmias), and have RV or LV pacing latency (stimulus to rapid QRS deflection) ≥30 msec

Exclusion Criteria:

  • Patients unable to comply with the study follow-up, life expectancy ≤1 year, suboptimal LV lead location (septal or apical)

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT03492788

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United States, Missouri
Washington University School of Medicine
Saint Louis, Missouri, United States, 63110
Sponsors and Collaborators
Washington University School of Medicine
American College of Cardiology
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Principal Investigator: Amit Noheria, MBBS, SM Assistant Professor of Medicine

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Responsible Party: Washington University School of Medicine Identifier: NCT03492788     History of Changes
Other Study ID Numbers: 201712146
First Posted: April 10, 2018    Key Record Dates
Last Update Posted: May 1, 2019
Last Verified: April 2019
Individual Participant Data (IPD) Sharing Statement:
Plan to Share IPD: Undecided

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Studies a U.S. FDA-regulated Drug Product: No
Studies a U.S. FDA-regulated Device Product: No
Keywords provided by Washington University School of Medicine:
cardiac resynchronization therapy
electrocardiographic imaging
Additional relevant MeSH terms:
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Bundle-Branch Block
Heart Failure, Systolic
Heart Failure
Heart Diseases
Cardiovascular Diseases
Heart Block
Arrhythmias, Cardiac
Cardiac Conduction System Disease
Pathologic Processes