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A Study to Determine the Effect of Bi-Ventricular Pacing on Cardiac Hemodynamics After Coronary Artery Bypass Graft

This study has been completed.
Sponsor:
ClinicalTrials.gov Identifier:
NCT00316368
First Posted: April 20, 2006
Last Update Posted: December 23, 2009
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.
Information provided by:
St. Michael's Hospital, Toronto
  Purpose

The purpose of this study is to determine, using echocardiography, whether bi-ventricular pacing improves the contractile force by resynchronizing both ventricles, thereby improving and/or correcting the paradoxical septal movement.

Primary Hypothesis:

  • Bi-ventricular pacing post cardiac surgery will result in at least a 10% increase in cardiac index (CI) as compared with standard atrio-right ventricular pacing.

Secondary Hypothesis:

  • Bi-ventricular pacing post cardiac surgery will result in at least a 10% increase in cardiac index (CI) as compared with atrio-left ventricular pacing and right atrium pacing.

Condition Intervention Phase
Coronary Disease Device: Ethicon TPW32 60 cm (pacing wires x 2) Phase 1

Study Type: Interventional
Study Design: Allocation: Non-Randomized
Intervention Model: Crossover Assignment
Masking: None (Open Label)
Official Title: A Study to Determine the Effect of Bi-Ventricular Pacing on Cardiac Hemodynamics After Coronary Artery Bypass Graft

Resource links provided by NLM:


Further study details as provided by St. Michael's Hospital, Toronto:

Primary Outcome Measures:
  • Cardiac index

Secondary Outcome Measures:
  • Intraventricular motion

Estimated Enrollment: 60
Study Start Date: October 2006
Study Completion Date: October 2008
Detailed Description:
Clinical trials done to date have focused on the efficacy of biventricular pacing (BVP) in the treatment of patients with congestive heart failure, Intraventricular conduction delay, dilated cardiomyopathies, and post cardiac surgery. However, studies done in post cardiac surgery patients are limited by their small sample size (4-22 patients with overall of 51 patients), non-randomized pacing protocol and by their inability to determine a definitive mechanism for the improved hemodynamics observed with BVP. Therefore, we propose to complete a pilot study aimed at determining both the magnitude of the hemodynamic benefit associated with BVP, if any. In addition, we will investigate changes in intra-ventricular septal motion as a possible mechanism for the previously observed changes in cardiac hemodynamics.
  Eligibility

Information from the National Library of Medicine

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Ages Eligible for Study:   18 Years and older   (Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No
Criteria

Inclusion Criteria:

  • All elective/emergent patients requiring isolated coronary artery bypass graft (CABG) at St. Michael's Hospital.

Exclusion Criteria:

  • Patient's age < 18 years.
  • Known atrial fibrillation.
  • Sinus tachycardia > 100 beats per minute (bpm).
  • Post-operative CI < 2.
  • High inotrope dosage post-operation:

    • Dopamine (Intropin) if > 10 µg/kg/min.
    • Dobutamine (Dobutrex) if > 10 µg/kg/min.
    • Norepinephrine (Levophed) if > 0.1 µg/kg/min.
    • Epinephrine if > 0.1 µg/kg/min.
  • Need for intraaortic balloon pump (IABP).
  • Unable or unwilling to give informed consent.
  • Already participating in another clinical trial.
  Contacts and Locations
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 ClinicalTrials.gov identifier (NCT number): NCT00316368


Locations
Canada, Ontario
St. Michael's Hospital
Toronto, Ontario, Canada, M5B 1W8
Sponsors and Collaborators
St. Michael's Hospital, Toronto
Investigators
Principal Investigator: David Latter, MD University of Toronto
  More Information

ClinicalTrials.gov Identifier: NCT00316368     History of Changes
Other Study ID Numbers: 05-318
First Submitted: April 18, 2006
First Posted: April 20, 2006
Last Update Posted: December 23, 2009
Last Verified: December 2009

Keywords provided by St. Michael's Hospital, Toronto:
Bi-Ventricular pacing post coronary artery bypass graft
coronary artery bypass graft

Additional relevant MeSH terms:
Coronary Disease
Coronary Artery Disease
Myocardial Ischemia
Heart Diseases
Cardiovascular Diseases
Vascular Diseases
Arteriosclerosis
Arterial Occlusive Diseases