Andersen-Tawil syndrome electrocardiogram
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Charmaine Patel, M.D. [2]; Raviteja Guddeti, M.B.B.S. [3]
Overview
An ECG may be very helpful in the diagnosis of Andersen-Tawil Syndrome. Findings on an ECG diagnostic of Andersen-Tawil Syndrome include a long QTc (LQT) interval, U waves, wide T-U junction and T-waves.
Electrocardiogram
An ECG may be helpful in the diagnosis of Andersen-Tawil Syndrome. Findings on an ECG diagnostic of Andersen-Tawil Syndrome include:
- A long QTc (LQT) interval
- T-U patterns which are very characteristic to the syndrome.
- U waves enlargement which are biphasic in limb leads
- A wide T-U junction
- Prolonged terminal T-wave
- Premature ventricular contractions
- Polymorphic ventricular tachycardia
- Bidirectional ventricular tachycardia
Electrocardiogram
Although polymorphic ventricular tachycardia is a common arrhythmia in patients with Anderson syndrome, decompensation into a hemodynamically compromising rhythm, or ventricular fibrillation, is rare. The following EKG findings are seen in patients with Andersen-Tawil syndrome:
- Biphasic U waves in limb leads
- Widened T-U junction
- Large U waves
- Prolonged terminal T wave downslope
- Prolonged Q-U intervals