Table 1.

Clinical characteristics of the affected family members.

Member	II-1	II-3(proband)	II-7	III-1
Sex	Female	Female	Male	Female
Current age(y)	58	56	53	34
Age at diagnosing(y)	46	39	41	28
Atrial-ventricular block	Third-degree AV block	Second-degree type 2 AV block	Third-degree AV block	First-degree AV block
Pacemaker	Yes	Yes	Yes	No
Atrial fibrillation	Yes	Yes	Yes	No
Radiofrequency catheter ablation	Yes	Yes	No	No