When the U Wave Tells the Story: Andersen-Tawil Syndrome Unmasked.

A 26-year-old woman with recurrent syncope was diagnosed with Andersen-Tawil syndrome (ATS) following abnormal electrocardiographic (ECG) findings. Her history of ventricular arrhythmias and prominent U waves on ECG led to genetic testing, which identified a KCNJ2 mutation. This case underscores the importance of recognizing ATS-specific ECG patterns, including broad U waves, in diagnosing arrhythmias. Following medication adjustments, her symptoms improved, highlighting the significance of tailored treatment for ATS-associated arrhythmias.