What does a finding of T-wave alternans indicate in the workup of long QT syndrome (LQTS)?

Updated: Nov 29, 2017
  • Author: Ali A Sovari, MD, FACP, FACC; Chief Editor: Mikhael F El-Chami, MD  more...
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Answer

Visible T-wave alternans in patients with LQTS indicates an increased risk of cardiac arrhythmias (ie, torsade de pointes and ventricular fibrillation).

Detection of microvolt T-wave alternans has low sensitivity and high specificity in diagnosing LQTS. The prognostic value of microvolt T-wave alternans has not been studied systematically.


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