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Pacing in First-degree AV-block

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: NCT01985802
Recruitment Status : Completed
First Posted : November 15, 2013
Last Update Posted : November 30, 2017
Information provided by (Responsible Party):
Duke University

Brief Summary:

The purpose of this study is to explore if there is a less harmful way to pace patients with first-degree AV-block to ensure that the negative effects inferred by the pacing do not outweigh the positive effects of AV-synchrony. The main hypothesis of the study is that His-bundle pacing will offer a more physiological mode of pacing in patients with first-degree AV-block than conventional pacing.

Patients scheduled for catheter ablation of atrial fibrillation (AF) in sinus rhythm, with first degree AV-block, normal QRS duration less than 120 ms and normal left ventricular ejection fraction will be included. During the AF ablation three different pacing modes (atrial, AV-synchronous and His-bundle pacing) at two different rates (5 to10 bpm above the basal rate and at 100 bpm) will be performed and evaluated using echocardiography. After the completion of all six pacing protocols (i.e., three modes at two different rates) the experimental part of the procedure ends.

The primary end-point will be echocardiographic evidence of dyssynchrony. Secondary end-points will include left ventricular ejection fraction, left ventricular volume, mitral regurgitation, septal to posterior wall motion delay and inter-ventricular wall motion delay. Since the research study is conducted in parallel with the standard catheter ablation, we do not anticipate any additional side effects as a result of the study.

Condition or disease Intervention/treatment Phase
First-degree AV-block Pacing Other: Pacing Not Applicable

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Study Type : Interventional  (Clinical Trial)
Estimated Enrollment : 20 participants
Allocation: N/A
Intervention Model: Single Group Assignment
Masking: None (Open Label)
Primary Purpose: Treatment
Official Title: Optimal Pacing in Patients With First-degree AV-block
Study Start Date : December 2015
Actual Primary Completion Date : October 26, 2017
Actual Study Completion Date : October 26, 2017

Arm Intervention/treatment
Pacing - Cross-over
Pacing will be conducted in 3 different ways (atrial, dual chamber and His-bundle pacing) at 2 different rates (basal and 100 bpm).
Other: Pacing
Other Name: Additional catheter may be used to evaluate heart performance during pacing. Does not require additional IV access

Primary Outcome Measures :
  1. Echocardiographic evidence of dyssynchrony (AV, intra- or inter-ventricular) [ Time Frame: During each step of the pacing procedure the echocardiographic data will be recorded; over approximately 5-10 minutes ]

Information from the National Library of Medicine

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Ages Eligible for Study:   21 Years and older   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • Patients scheduled for catheter ablation of atrial fibrillation in sinus rhythm and PR prolongation exceeding or equal to 200 ms
  • QRS duration less than 120 ms
  • Normal left ventricular ejection fraction on echocardiography.

Exclusion Criteria:

  • Any bundle branch block
  • Second- or third-degree AV-block
  • Congestive heart failure, cardiomyopathy, myocardial infarction or major surgical procedure.

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): NCT01985802

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United States, North Carolina
Duke University Hospital
Durham, North Carolina, United States, 27710
Sponsors and Collaborators
Duke University
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Principal Investigator: James P Daubert, MD Duke University
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Responsible Party: Duke University Identifier: NCT01985802    
Other Study ID Numbers: Pro00048871
First Posted: November 15, 2013    Key Record Dates
Last Update Posted: November 30, 2017
Last Verified: November 2017
Additional relevant MeSH terms:
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Atrioventricular Block
Heart Block
Arrhythmias, Cardiac
Heart Diseases
Cardiovascular Diseases
Cardiac Conduction System Disease
Pathologic Processes