Clinical trial Recruiting at 62 sites Interventional Ages 18 and up

Comparing His and Left Bundle Branch Pacing for Heart Failure

Official title: Cardiac Resynchronization Therapy Using His/Left Bundle Branch Pacing vs Biventricular Pacing With a Left Ventricular Epicardial Lead in Patients With Heart Failure (HF) With Left Ventricular Ejection Fraction (LVEF)≤50% and With Either a Wide QRS Complex (>130 ms) or With/Anticipated >40% Pacing Randomized Clinical Trial

Run by Baylor College of Medicine · NCT05650658 · Data updated 2026-11-12

This study is testing whether a new way of pacing the heart can help people with heart failure feel better and stay out of the hospital compared to the usual treatment.

Quick facts

Study typeInterventional
Ages18 Years and up
SexAll
Enrollment2136 (estimated)
SponsorBaylor College of Medicine
Academic / other
Locations71 sites (Gilbert, Arizona and 70 other locations)
StatusRecruiting
StartedSeptember 13, 2023
Main results expectedJune 30, 2029
Study endsJune 30, 2029
Registry record updatedOctober 2, 2025
Trial IDNCT05650658 on ClinicalTrials.gov

Is this trial a fit for you?

Likely a good fit

Ideal candidates include men and women aged 18 and older with heart failure, a left ventricular ejection fraction of 50% or less, and a wide QRS duration.

Probably not a fit

Patients with significant coronary artery disease requiring revascularization or those who are pregnant or lactating may not benefit from this study.

A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.

What this trial studies

This clinical trial aims to evaluate the effectiveness of His or Left bundle branch pacing compared to standard biventricular pacing in patients with heart failure due to left ventricular systolic dysfunction. The study will assess patient-centered outcomes such as quality of life, physical activity, heart failure hospitalizations, and mortality, as well as safety outcomes related to device complications. Participants will be randomized and monitored over time to determine the best pacing strategy for improving heart failure management.

Why it matters

Potential benefit: If successful, this study could lead to improved heart failure management and better quality of life for patients through optimized pacing techniques.

How similar studies have gone: Other studies have shown promising results with similar pacing approaches, suggesting potential for success in this trial.

Who can join: the full rules

Show full inclusion / exclusion criteria
Inclusion Criteria:

* Men and women 18 years of age or older.
* A LVEF ≤ 50% within 6 months prior to enrollment.
* Resting QRS duration ≥130 ms as evidenced by a historical 12-lead ECG prior to enrollment OR anticipated right ventricular pacing \>40% OR device in place with right ventricular pacing \> 40%.
* Are optimized on HF guideline directed medical therapy according to current HF published guidelines OR patient's physician will make an effort to start all guideline-directed medical therapy and titrate doses up as permitted by the participant clinical status and co-morbidities prior to implantation procedure.

Exclusion Criteria:

* Women who are pregnant, lactating, or plan to become pregnant during the course of the trial.
* Participants with angiographic evidence of coronary disease who are candidates for coronary revascularization and are likely to undergo coronary artery bypass graft surgery or percutaneous coronary, intervention in the next three (3) months.
* Enzyme-positive myocardial infarction within the past three (3) months prior to enrollment.
* Coronary artery bypass graft surgery or percutaneous coronary intervention (balloon and/or stent angioplasty) within the past three (3) months prior to enrollment.
* Reversible non-ischemic cardiomyopathy (e.g., acute viral myocarditis).
* Participants with Chagas disease, cardiac sarcoidosis or amyloidosis.
* Expected to receive left ventricular assist device or heart transplantation within 6 months.
* Participants with primary severe valvular disease (e.g., aortic stenosis).
* Have a life expectancy of less than 12 months.
* Participants with irreversible brain damage from preexisting cerebral disease.
* Participants with a contrast dye allergy unable or unwilling to undergo pretreatment with steroids and/or diphenhydramine.
* Participants participating in any other interventional cardiovascular clinical trial.
* Participants who would be unable to comply with the study's follow-up visit schedule; or
* Participants who had any prior unsuccessful attempt at implantation of biventricular pacing (BiVP), His Bundle Pacing (HBP), or Left Bundle Branch Pacing (LBBP) device.

Where it's running

  • Mercy Gilbert & Chandler Regional Medical Centers, Gilbert AZ
    Gilbert, Arizona, United States
    Recruiting
  • University of Arizona College of Medicine- Phoenix
    Tucson, Arizona, United States
    Recruiting
  • University of Arkansas for Medical Sciences (UAMS)
    Little Rock, Arkansas, United States
    Recruiting
  • University of California San Diego
    La Jolla, California, United States
    Recruiting
  • University of Colorado (Anschutz Medical Campus)
    Denver, Colorado, United States
    Recruiting
  • South Denver Cardiology Associates
    Littleton, Colorado, United States
    Recruiting
Show 44 more locations
  • Hartford Hospital
    Hartford, Connecticut, United States
    Recruiting
  • Yale University
    New Haven, Connecticut, United States
    Recruiting
  • Heart Rhythm Solutions
    Davie, Florida, United States
    Recruiting
  • Cleveland Clinic Florida
    Palm Beach Gardens, Florida, United States
    Recruiting
  • University of South Florida
    Tampa, Florida, United States
    Recruiting
  • Rush University
    Chicago, Illinois, United States
    Recruiting
  • University of Chicago
    Chicago, Illinois, United States
    Recruiting
  • Northwestern University
    Evanston, Illinois, United States
    Recruiting
  • Trustees of Indiana University
    Indianapolis, Indiana, United States
    Recruiting
  • Baptist Health Louisville
    Louisville, Kentucky, United States
    Recruiting
  • Massachusetts General Hospital
    Boston, Massachusetts, United States
    Recruiting
  • Beth Israel Deaconess Medical Center
    Boston, Massachusetts, United States
    Recruiting
  • Mayo Clinic
    Rochester, Minnesota, United States
    Recruiting
  • HMH Hospitals Corporation
    Hackensack, New Jersey, United States
    Recruiting
  • Virtua Health
    Marlton, New Jersey, United States
    Recruiting
  • Newark Beth Israel Medical Center
    Newark, New Jersey, United States
    Recruiting
  • The Valley Hospital, Inc.
    Ridgewood, New Jersey, United States
    Recruiting
  • Lovelace Medical Center
    Albuquerque, New Mexico, United States
    Recruiting
  • Weill Cornell Medicine
    New York, New York, United States
    Recruiting
  • Icahn School of Medicine at Mount Sinai
    New York, New York, United States
    Recruiting
  • MH Mission Hospital LLLP- Asheville Cardiology Associates
    Asheville, North Carolina, United States
    Recruiting
  • University of North Carolina
    Chapel Hill, North Carolina, United States
    Recruiting
  • Novant Health
    Charlotte, North Carolina, United States
    Recruiting
  • The Christ Hospital
    Cincinnati, Ohio, United States
    Recruiting
  • The MetroHealth System
    Cleveland, Ohio, United States
    Recruiting
  • Cleveland Clinic
    Cleveland, Ohio, United States
    Recruiting
  • Oregon Health & Science University
    Portland, Oregon, United States
    Recruiting
  • St. Luke's University Health Network
    Allentown, Pennsylvania, United States
    Recruiting
  • Lehigh Valley Hospital Inc.
    Allentown, Pennsylvania, United States
    Recruiting
  • Penn Medicine Lancaster General
    Lancaster, Pennsylvania, United States
    Recruiting
  • University of Pennsylvania
    Philadelphia, Pennsylvania, United States
    Recruiting
  • Thomas Jefferson University Hospital
    Philadelphia, Pennsylvania, United States
    Recruiting
  • Allegheny-Singer Research Institute
    Pittsburgh, Pennsylvania, United States
    Recruiting
  • University of Pittsburg
    Pittsburgh, Pennsylvania, United States
    Recruiting
  • Geisinger Commonwealth School of Medicine
    Scranton, Pennsylvania, United States
    Recruiting
  • Medical University of South Carolina (MUSC)
    Charleston, South Carolina, United States
    Recruiting
  • Baylor College of Medicine
    Houston, Texas, United States
    Recruiting
  • St. Mark's Hospital
    Salt Lake City, Utah, United States
    Recruiting
  • University of Vermont
    Burlington, Vermont, United States
    Recruiting
  • University of Virginia Health System
    Charlottesville, Virginia, United States
    Recruiting
  • Inova Heart and Vascular Institute
    Falls Church, Virginia, United States
    Recruiting
  • Sentara Healthcare
    Newport News, Virginia, United States
    Recruiting
  • Virginia Commonwealth University
    Richmond, Virginia, United States
    Recruiting
  • University of Washington
    Seattle, Washington, United States
    Recruiting

+21 more sites. See ClinicalTrials.gov for the full list.

Study contacts

  • Principal investigator: Mihail G Chelu, MD, PhD — Baylor College of Medicine
  • Study coordinator: Mihail G Chelu, MD, PhD
  • Email: leftvsleft@bcm.edu
  • Phone: 7137987291

Similar studies

Other studies for the same condition or treatment. Recruiting studies are listed first.

How to take part

  1. Review the eligibility criteria above with your treating physician.
  2. Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
  3. Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.
Last reviewed 2026-11-14 by the Find a Trial editorial team. Information on this page is for educational purposes and is not medical advice. Always consult qualified healthcare professionals about clinical trial participation.