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Typical examples of Type 1 P‐wave morphology (A), and Type 2 P‐wave morphology (B). Type 3 P‐wave morphology (C) was identified in 11 patients (10 HCM patients and 1 control subject). The pattern is compatible with Bachmann's bundle block. 23 Two patients from the HCM population were excluded from subsequent analysis because of P‐wave morphology noncompatible with sinus rhythm (i.e., predominantly negative Lead Y).
