[Technical and practical aspects of T-wave alternans testing].

Area of Science:

• Cardiology
• Electrophysiology

Context:

• T-wave alternans (TWA) is an important noninvasive marker for cardiac risk stratification.
• Previous studies demonstrated TWA's ability to predict ventricular tachyarrhythmias.
• Recent clinical studies confirm TWA's prognostic value in high-risk populations.

Purpose:

• To review the technical and practical aspects of T-wave alternans assessment and interpretation.
• To provide clinicians with essential information for TWA testing.

Summary:

• T-wave alternans (TWA), the alternation in ECG T-wave amplitude, is a significant predictor of sudden cardiac death.
• Positive TWA results in post-myocardial infarction and heart failure patients indicate high risk.
• TWA is mechanistically linked to arrhythmogenesis and can be measured noninvasively via exercise testing.

Impact:

• Facilitates improved cardiac risk stratification using TWA.
• Enhances clinical decision-making for patients at risk of sudden cardiac death.
• Supports the broader adoption of TWA testing in clinical practice.