Could a simple pacemaker switch ease heart failure?
NCT ID NCT06052475
First seen Jun 27, 2026 · Last updated Jun 27, 2026
Summary
This trial investigates whether people with heart failure and a traditional right ventricular pacemaker feel better and have stronger hearts after switching to a more natural pacing method, such as His bundle or biventricular pacing. Participants will have their pacemaker upgraded and then spend time in both pacing modes, blinded, to compare symptoms, heart function, and quality of life. The study aims to see if a simple device change can reverse pacing-induced heart damage.
What this could mean
Our plain-language read of the trial. This is informational only, not medical advice or a prediction.
- Active substance
- Physiological pacing upgrade (conduction system pacing or biventricular pacing device)
- What this could lead to
- If successful, this could show that upgrading pacemakers to a more natural pacing method improves heart function and daily well-being for people with pacing-induced cardiomyopathy.
- What could go wrong
- This is a relatively small crossover trial, and the benefits may not be large or apply to all patients. The procedure itself carries risks like infection or lead displacement.
This is an AI summary of the original study and may miss details. Read our disclaimer.
Study facts
What this study's own registry entry says, in plain language.
- Phase
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Not a phased trial
Phase numbers describe drug development. The registry uses this when they do not apply, as it does for trials of devices, procedures or behaviour changes, and for observational studies.
- Participants
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About 155 people
The number the study aims to enrol. It can still change while the study runs.
- Started
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Sep 2023
- Expected to finish
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Sep 2027
An estimate. End dates often move.
- Lead sponsor
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Other sponsor
The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.
Who can take part
This study's own entry requirements. Only the study team can say for certain whether you qualify.
- Ages
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18 years and older
- Sex
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Anyone
- Healthy volunteers
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Not accepted
This study is not open to healthy volunteers. The entry requirements below say who it is open to.
Show the full entry requirements Hide the full entry requirements
Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.
Patients with an RV pacemaker and LVEF 35-50% and a high burden of right ventricular pacing (\>40%) who are clinically indicated for a cardiac resynchronisation therapy upgrade procedure and: 1. EF reduced by \>5% of increase in LVESV by 10ml since implant 2. NT-proBNP \>250ng/L in sinus rhythm 3. NT-proBNP \> 750 Ng/L if AF 4. Left atrial volume index \> 30ml/m2 5. Regular loop diuretics prescribed 6. Decline in daily patient activity by \>1 hour per day since implant 7. Decrease in device measured thoracic impedance 8. Patient reported decline in functional class or exercise tolerance Exclusion Criteria: * Those unable to provide informed consent * Patients under age 18 * Pregnant women
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Conditions
The condition(s) this trial relates to.
As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
How to take part
Only the study team decides who joins. These are the ways to reach them.
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The places running it
12 sites. The list below names each one and where it is.
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The official record
ClinicalTrials.gov lists the study team's own contact details, including names and phone numbers. We don't republish those.
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A doctor treating you
A doctor who knows your case can contact a study site on your behalf, and can tell you whether this study is worth pursuing at all.
Contacts and locations
Locations
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Croydon University Hospital - Croydon Health Services
RECRUITINGCroydon, United Kingdom
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Glenfield Hospital
RECRUITINGLeicester, United Kingdom
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Great Western Hospitals
RECRUITINGSwindon, United Kingdom
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Hammersmith Hospital
RECRUITINGLondon, United Kingdom
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King's College Hospital
RECRUITINGLondon, United Kingdom
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Oxford University Hospitals
RECRUITINGOxford, United Kingdom
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Royal Papworth Hospital
RECRUITINGCambridge, United Kingdom
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St Bartholomew's Hospital - Barts Health NHS Trust
RECRUITINGLondon, United Kingdom
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St. Richard's Hospital - University Hospitals Sussex
RECRUITINGChichester, United Kingdom
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University Hospitals Coventry and Warwickshire NHS Trust,
RECRUITINGCoventry, United Kingdom
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University Hospitals Southampton
RECRUITINGSouthampton, United Kingdom
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Worthing Hospital - University Hospitals Sussex
RECRUITINGWorthing, United Kingdom
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- Can modern heart failure drugs reverse damage in three months?