Figure legend
Fig. 1 Family pedigree. The proband (ATS-003) is indicated by the arrow. Family members with ATS are illustrated as a red color (ATS-001 and ATS-002). Unaffected family members are illustrated as open symbols. A circle represents a female and a square represents a male.
Fig. 2 Twelve-lead ECG at A. First visit, B. Antepartum period, C. Postpartum period, D. Postpartum period with flecainide
Fig. 3 Twelve-lead ECG demonstrating A. Incessant bidirectional VT, B. Sinus rhythm with prominent U wave and occasional PVCs, C. Normal sinus rhythm