A 16-year-old girl presents with recurrent syncope triggered by emotional stress and loud noises during school. ECG shows QTc prolongation of 485 ms with low-amplitude notched T-waves. Genetic testing confirms a heterozygous mutation in KCNH2. The inheritance pattern marked **B** in the pedigree diagram represents the mode of transmission in this family. Which of the following clinical features is MOST consistent with this inheritance pattern and genotype?
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