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Figure 1 (A) Shows a 12-lead electrocardiogram (ECG) for Patient #4 with tachycardia originating from the left midseptal area. The P-wave in the insert is enlarged to show slightly positive P-wave in lead V1, slightly positive in I, biphasic in II, III, aVL, and aVF. (B) Shows a 12-lead ECG for Patient #3 with tachycardia originating from the left inferoposteroseptal area. The P-wave in the insert is enlarged to show isoelectric P waves in lead V1, positive waves in I, II, III, and aVL. (C) Shows a 12-lead ECG for Patient #4 with tachycardia originating from the left midseptal area. The P-wave in the insert is enlarged to show biphasic P waves across the precordium, slightly positive waves in I, II, aVF, and isoelectric P waves in the remainder.
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