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Figure 1 The P-wave morphology from three patients is presented. The characteristic findings were: a deeply inverted P-wave in the inferior leads with 4 of 13 patients having a secondary upright component (B and C). Lead V1 was inverted (B and C) or isoelectric (A) then upright. Leads aVL and aVR were positive in 13 of 13 patients.
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