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Figure 1 A representative surface electrocardiogram (ECG) and mid-right atrial intracardiac tracing (RA 1–2) from a study participant. The left panel demonstrates sinus rhythm. The right panel demonstrates IART with low amplitude, biphasic p waves in lead I and upright, nonsinus p waves in leads II and III, along with 2:1 atrioventricular conduction. I = ECG lead I; II = lead II; III = lead III; aVR = lead aVR; aVL = lead aVL; aVF = lead aVF; RA = right atrial electrogram; A = atrial electrogram; V = ventricular electrogram.
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