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.
Study Type
OBSERVATIONAL
Enrollment
11
PCI previously electively scheduled.
Columbia University Medical Center
New York, New York, United States
Number of Subjects With Positive T Wave Studies During a Coronary Intervention
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.
Time frame: During the coronary intervention, upto 2 hours
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