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Low enrollment
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| Name | Class |
|---|---|
| Central Arkansas Veterans Healthcare System | FED |
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This study will address whether acute adaptive RV pacing in sinus rhythm patients with severe LV systolic dysfunction and RBBB is superior to no ventricular pacing, and is as effective as echocardiographically optimized biventricular (BIV) pacing based on Medtronic ECG belt and cardiac performance as assessed by the echocardiographic parameters of RV and LV function.
Current guidelines state that CRT implantation is less beneficial for patients with RBBB compared to those with LBBB (2). Current evidence suggests that frequent or persistent RV-only pacing in patients with narrow QRS and LV dysfunction can be harmful due to ventricular desynchronization attributable to RV apex pacing (3-5).
Studies suggest that LV-only pacing is not inferior to BIV pacing in sinus rhythm patients with LV dysfunction and LBBB and ICD back up (6,7). A novel algorithm of CRT by delivering synchronized LV pacing with the intrinsic conduction in patients with severe LV systolic dysfunction and LBBB (adaptive CRT) has been demonstrated to show that it is at least as effective as protocol-driven echocardiographic optimization. It also has shown a significant reduction in the probability of 30-day readmission for both HF and all-cause hospitalizations, 46% reduced incidence of AF compared to conventional CRT, and prolongation of CRT device battery life (8-10). Patients who had an adaptive CRT algorithm that provided > 50% synchronized LV pacing or had normal AV conduction with the adaptive CRT algorithm had decreased risk of death or heart failure hospitalization when compared to those with <50% synchronized LV pacing or echocardiography-optimized BIV pacing respectively (11). In another acute study the LV dP/dtmax was higher with LV than BIV pacing when LV pacing was associated with ventricular fusion caused by intrinsic activation (12).
Several studies have suggested that optimization of the programmed atrioventricular delay (AVD) and interventricular delay (VVD) delays may incrementally improve the long-term outcome of BIV pacing (13-15).
The lateral LV wall contracts early in patients with RBBB when compared to LBBB so LV pacing in the CRT devices is less likely to be beneficial. . In an experimental study of 12 dogs with tachycardia-induced cardiomyopathy and RBBB (6 dogs) or LBBB (6 dogs) (16), RV-only pacing enhanced LV function and synchrony as seen by dP/dtmax measured by catheter tip placed in the LV chamber and synchrony evaluation by cardiac MRI in the RBBB group as well or better than BIV pacing. LV-only pacing worsened function in the RBBB group.
RV-only pacing was also evaluated in a prospective study of 7 patients with RBBB and RV dysfunction with most patients having congenital heart disease. LV global function was intact at baseline (17). Sequential atrioventricular RV pacing with an atrioventricular delay of 90% of the PR interval was superior to atrial-only pacing for both improvement in RV dP/dtmax and LV cardiac index as seen at cardiac catheterization. The RV dP/dtmax increased by 22% in RBBB patients with RV pacing and QRS decreased from 163 +/- 39 to 126 +/- 31 ms. The two studies together suggest that most of the benefit from BIV pacing in patients with RBBB and HF is due to the RV pacing component and the benefit might be reduced due to the LV pacing component. Better timing of RV pacing in patients with RBBB might significantly decrease desynchronization from RV pacing and maximize the benefit of RV pacing as seen in adaptive LV-pacing CRT in patients with LBBB and LV systolic dysfunction.
These studies have led to the current hypothesis that adaptive RV pacing using RV-only pacing synchronized to LV activation when intrinsic AV conduction is normal is more physiological and will improve RV and LV function by Echocardiography parameters and on Medtronic ECG belt for activation in patients with RBBB and LV dysfunction because of improved synchronization and narrowing the QRS duration.
As a secondary goal, battery life with BIV pacing will be compared to adaptive RV pacing assuming at least 50% of RV-only pacing will be achieved with adaptive CRT for RBBB.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| CRT Optimization | Other | Each patient will have atrial pacing 10% higher than the sinus rate or atrial pacing at a rate of 60 bpm if significant sinus bradycardia is present. Each patient will have six ECGs and echocardiographic sequences performed in the same session. In addition six electrical activation evaluations by the Medtronic ECG belt will be done as well. The first study will always be with no ventricular pacing. One study will be echocardiography-optimized BIV pacing and four studies for echocardiography-optimized (?) adaptive RV-only pacing with different AV intervals. A random-sequence will be performed to determine the order for the rest of the studies. |
|
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Optimization of CRT Device | Diagnostic Test | Each patient will have atrial pacing 10% higher than the sinus rate or atrial pacing at a rate of 60 bpm if significant sinus bradycardia is present. Each patient will have six ECGs and echocardiographic sequences performed in the same session. In addition six electrical activation evaluations by the Medtronic ECG belt will be done as well. The first study will always be with no ventricular pacing. One study will be echocardiography-optimized BIV pacing and four studies for echocardiography-optimized (?) adaptive RV-only pacing with different AV intervals. A random-sequence will be performed to determine the order for the rest of the studies. |
| Measure | Description | Time Frame |
|---|---|---|
| Effectiveness of adaptive Right Ventricular (RV) pacing | Echocardiographic parameters to measure cardiac function, including:
| 1 hour |
| Measure | Description | Time Frame |
|---|---|---|
| Battery/device longevity | Calculations of current drain and pacing percentages for RV-only pacing versus BIV pacing. Measured by microjoule current consumption. | 1 hour |
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Inclusion Criteria: Included patients will have:
Exclusion Criteria:
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| Name | Affiliation | Role |
|---|---|---|
| Waddah Maskoun, MD | Henry Ford | Principal Investigator |
| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| Central Arkansas Veterans Healthare System | Little Rock | Arkansas | 72205 | United States | ||
| Henry Ford Hospital |
| PubMed Identifier | Type | Citation | Retractions |
|---|---|---|---|
| 19281930 | Background | Surawicz B, Childers R, Deal BJ, Gettes LS, Bailey JJ, Gorgels A, Hancock EW, Josephson M, Kligfield P, Kors JA, Macfarlane P, Mason JW, Mirvis DM, Okin P, Pahlm O, Rautaharju PM, van Herpen G, Wagner GS, Wellens H; American Heart Association Electrocardiography and Arrhythmias Committee, Council on Clinical Cardiology; American College of Cardiology Foundation; Heart Rhythm Society. AHA/ACCF/HRS recommendations for the standardization and interpretation of the electrocardiogram: part III: intraventricular conduction disturbances: a scientific statement from the American Heart Association Electrocardiography and Arrhythmias Committee, Council on Clinical Cardiology; the American College of Cardiology Foundation; and the Heart Rhythm Society. Endorsed by the International Society for Computerized Electrocardiology. J Am Coll Cardiol. 2009 Mar 17;53(11):976-81. doi: 10.1016/j.jacc.2008.12.013. No abstract available. | |
| 22975230 |
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| Release Date | Unrelease Date | Unrelease Date Unknown | Reset Date | MCP Release Number |
|---|---|---|---|---|
| Jul 25, 2023 | Aug 16, 2023 | 1 | ||
| Sep 21, 2023 |
| ID | Term |
|---|---|
| D002037 | Bundle-Branch Block |
| ID | Term |
|---|---|
| D006327 | Heart Block |
| D001145 | Arrhythmias, Cardiac |
| D006331 | Heart Diseases |
| D002318 | Cardiovascular Diseases |
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|
| Detroit |
| Michigan |
| 48202 |
| United States |
| Background |
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| 30991823 | Background | Gasparini M, Birnie D, Lemke B, Aonuma K, Lee KL, Gorcsan J 3rd, Landolina M, Klepfer R, Meloni S, Cicconelli M, Grammatico A, Martin DO. Adaptive Cardiac Resynchronization Therapy Reduces Atrial Fibrillation Incidence in Heart Failure Patients With Prolonged AV Conduction: The Adaptive CRT Randomized Trial. Circ Arrhythm Electrophysiol. 2019 May;12(5):e007260. doi: 10.1161/CIRCEP.119.007260. No abstract available. |
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| 23851059 | Background | Birnie D, Lemke B, Aonuma K, Krum H, Lee KL, Gasparini M, Starling RC, Milasinovic G, Gorcsan J 3rd, Houmsse M, Abeyratne A, Sambelashvili A, Martin DO. Clinical outcomes with synchronized left ventricular pacing: analysis of the adaptive CRT trial. Heart Rhythm. 2013 Sep;10(9):1368-74. doi: 10.1016/j.hrthm.2013.07.007. Epub 2013 Jul 11. |
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| 16784420 | Background | Morales MA, Startari U, Panchetti L, Rossi A, Piacenti M. Atrioventricular delay optimization by doppler-derived left ventricular dP/dt improves 6-month outcome of resynchronized patients. Pacing Clin Electrophysiol. 2006 Jun;29(6):564-8. doi: 10.1111/j.1540-8159.2006.00402.x. |
| 17826387 | Background | Vidal B, Sitges M, Marigliano A, Delgado V, Diaz-Infante E, Azqueta M, Tamborero D, Tolosana JM, Berruezo A, Perez-Villa F, Pare C, Mont L, Brugada J. Optimizing the programation of cardiac resynchronization therapy devices in patients with heart failure and left bundle branch block. Am J Cardiol. 2007 Sep 15;100(6):1002-6. doi: 10.1016/j.amjcard.2007.04.046. Epub 2007 Jul 5. |
| 17919569 | Background | Byrne MJ, Helm RH, Daya S, Osman NF, Halperin HR, Berger RD, Kass DA, Lardo AC. Diminished left ventricular dyssynchrony and impact of resynchronization in failing hearts with right versus left bundle branch block. J Am Coll Cardiol. 2007 Oct 9;50(15):1484-90. doi: 10.1016/j.jacc.2007.07.011. Epub 2007 Sep 24. |
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| 18483207 | Background | Epstein AE, DiMarco JP, Ellenbogen KA, Estes NA 3rd, Freedman RA, Gettes LS, Gillinov AM, Gregoratos G, Hammill SC, Hayes DL, Hlatky MA, Newby LK, Page RL, Schoenfeld MH, Silka MJ, Stevenson LW, Sweeney MO, Smith SC Jr, Jacobs AK, Adams CD, Anderson JL, Buller CE, Creager MA, Ettinger SM, Faxon DP, Halperin JL, Hiratzka LF, Hunt SA, Krumholz HM, Kushner FG, Lytle BW, Nishimura RA, Ornato JP, Page RL, Riegel B, Tarkington LG, Yancy CW; American College of Cardiology/American Heart Association Task Force on Practice Guidelines (Writing Committee to Revise the ACC/AHA/NASPE 2002 Guideline Update for Implantation of Cardiac Pacemakers and Antiarrhythmia Devices); American Association for Thoracic Surgery; Society of Thoracic Surgeons. ACC/AHA/HRS 2008 Guidelines for Device-Based Therapy of Cardiac Rhythm Abnormalities: a report of the American College of Cardiology/American Heart Association Task Force on Practice Guidelines (Writing Committee to Revise the ACC/AHA/NASPE 2002 Guideline Update for Implantation of Cardiac Pacemakers and Antiarrhythmia Devices): developed in collaboration with the American Association for Thoracic Surgery and Society of Thoracic Surgeons. Circulation. 2008 May 27;117(21):e350-408. doi: 10.1161/CIRCUALTIONAHA.108.189742. Epub 2008 May 15. No abstract available. |
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| 15564419 | Background | Lane RE, Chow AW, Chin D, Mayet J. Selection and optimisation of biventricular pacing: the role of echocardiography. Heart. 2004 Dec;90 Suppl 6(Suppl 6):vi10-6. doi: 10.1136/hrt.2004.043000. |
| 19067818 | Background | Ypenburg C, Van De Veire N, Westenberg JJ, Bleeker GB, Marsan NA, Henneman MM, Van Der Wall EE, Schalij MJ, Abraham TP, Barold SS, Bax JJ. Noninvasive imaging in cardiac resynchronization therapy--Part 2: Follow-up and optimization of settings. Pacing Clin Electrophysiol. 2008 Dec;31(12):1628-39. doi: 10.1111/j.1540-8159.2008.01237.x. |
| Oct 9, 2023 |
| 2 |
| Mar 21, 2025 | Apr 8, 2025 | 3 |
| May 1, 2025 | May 16, 2025 | 4 |
| Jul 29, 2025 | Aug 13, 2025 | 5 |
| Jan 28, 2026 | Feb 13, 2026 | 6 |
| D000075224 |
| Cardiac Conduction System Disease |
| D010335 | Pathologic Processes |
| D013568 | Pathological Conditions, Signs and Symptoms |