Intracardiac T-wave Alternans and Ischemia

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: NCT00669552
Recruitment Status : Completed
First Posted : April 30, 2008
Results First Posted : March 28, 2013
Last Update Posted : April 19, 2013
Information provided by (Responsible Party):
Jose M. Dizon, Columbia University

Brief Summary:

T-wave alternans is a test that looks at microvolt changes in the T-wave on a beat to beat basis. The presence or absence of such changes has been shown to predict or exclude future arrhythmic events. The mechanism of T-wave alternans is unclear, but may relate to calcium metabolism in the heart, and may be affected by conditions such as ischemia or heart failure.

The purpose of this study is to determine whether T-wave alternans, as measured through the lead of an implantable defibrillator, is produced by acute ischemia induced by occlusion during percutaneous coronary interventions.

Condition or disease Intervention/treatment
Ischemia Procedure: Percutaneous coronary intervention

Study Type : Observational
Actual Enrollment : 11 participants
Observational Model: Cohort
Time Perspective: Prospective
Official Title: Intracardiac T-wave Alternans and Ischemia During Percutaneous Coronary Interventions
Study Start Date : August 2008
Actual Primary Completion Date : July 2012
Actual Study Completion Date : July 2012

Group/Cohort Intervention/treatment
Medtronic defibrillator
Patients undergoing a percutaneous coronary intervention (PCI) with an implanted Medtronic defibrillator with the capability of telemetry of the intracardiac signal.
Procedure: Percutaneous coronary intervention
PCI previously electively scheduled.

Primary Outcome Measures :
  1. Number of Subjects With Positive T Wave Studies During a Coronary Intervention [ Time Frame: During the coronary intervention, upto 2 hours ]
    Positive T wave alternans is determined by a proprietary program using ECG recordings during a stress test. The result is reported as positive, negative, or indeterminate.

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Ages Eligible for Study:   18 Years and older   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No
Sampling Method:   Non-Probability Sample
Study Population
Patients with coronary artery disease (CAD) undergoing PCI that also have an appropriate Medtronic implantable defibrillator.

Inclusion Criteria:

  • patient with CAD undergoing PCI with appropriate Medtronic implantable defibrillator.

Exclusion Criteria:

  • non-elective procedure
  • non-qualifying defibrillator type.

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): NCT00669552

United States, New York
Columbia University Medical Center
New York, New York, United States, 10032
Sponsors and Collaborators
Columbia University
Principal Investigator: Jose M Dizon, MD Columbia University

Responsible Party: Jose M. Dizon, Assoc Professor of Clinical, Department of Medicine Cardiology, Columbia University Identifier: NCT00669552     History of Changes
Other Study ID Numbers: AAAC6715
First Posted: April 30, 2008    Key Record Dates
Results First Posted: March 28, 2013
Last Update Posted: April 19, 2013
Last Verified: April 2013

Additional relevant MeSH terms:
Pathologic Processes