T-wave alternans


Also found in: Acronyms.

T-wave alternans

A repolarisation phenomenon manifesting as a microvolt beat-to-beat change in the amplitude of the T wave and ST segment on EKGs.  T-wave alternans has low specificity as a predictor of arrhythmic risk in unselected populations with prior myocardial infarction.

T-wave alternans

Cardiology A subtle every-other-beat variation in T waves that is prognostic of Pts at high risk for life-threatening cardiac arrhythmias and sudden cardiac death. See Alternans test.
References in periodicals archive ?
T-wave alternans and the susceptibility to ventricular arrhythmias.
Ambulatory ECG-based T-wave alternans and heart rate turbulence can predict cardiac mortality in patients with myocardial infarction with or without diabetes mellitus.
ECG tracings from patients belong to the T-Wave Alternans Challenge Database (TWACD) [17], which contains 100 multichannel ECG records sampled at 500 Hz with 16 bit resolution over a [+ or -] 32 mV range.
"The T-wave alternans test is especially important, because it can identify who's at risk for sudden cardiac death," says Cleveland Clinic cardiologist Patrick Tchou, MD.
Computers can detect the abnormality, called T-wave alternans, during an electrocardiogram, a recording of the heart's electrical activity.
Consider the FDA's recent approval of a T-wave alternans test.
Petersburg, Fla., have successfully employed 37-channel magnetocardiography to identify T-wave alternans in fetuses.
"In multiple clinical studies, the microvolt T-wave alternans testing has been shown to identify accurately both the high- and low-risk patients," explains Dr.
(NASDAQ-CAMH), Bedford, Mass, has announced that clinical results, presented at the annual meeting of the American Heart Association demonstrate that Microvolt T-Wave Alternans (MTWA) testing can help determine which MADIT II type patients (prior myocardial infarction and left ventricular ejection fraction of 30% or less) should receive an implantable cardioverter defibrillator (ICD).
The test measures a tiny fluctuation in heartbeat called the T-wave alternans.
BACKGROUND: Epidemiological studies have assessed T-wave alternans (TWA) as a possible mechanism of cardiac arrhythmias related to air pollution in high-risk subjects and have reported associations with increased TWA magnitude.