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Basal ECGs of patient II,6. The ECGs show QTc prolongation, intermittent saddle‐back type Brugada ECG in the right precordial leads, and progressive conduction disease. The patient developed second‐degree atrioventricular block at the age of 78 years. A, Age 64: PR 193 ms, QRS 85 ms, QTc 461 ms. B, Age 75: PR 205 ms, QRS 94 ms, QTc 467 ms. C, Age 77: PR 229 ms, QRS 95 ms, QTc 472 ms. D, Age 78: Second‐degree AV block, QRS 104 ms, QTc 465 ms. E, Age 81: DDD pacemaker ECG.
