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Figure 4 (A) A 12-lead electrocardiogram (ECG) from Patient #1. Note the upright P waves in the inferior leads (arrow) and the lack of transition across the precordial leads. The paper speed is 25 mm/s. (B) A 12-lead ECG from Patient #2. Note the multicomponent P waves in lead II (arrow). The paper speed is 25 mm/s. (C) A 12-lead ECG from Patient #13. The P waves in lead V1 are upright (arrow). The paper speed is 25 mm/s. Abbreviations as in Figure 2.
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