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Figure 3 Atrial signal amplitude detected by the Solo lead in right atrial (RA) to coronary sinus (CS) vector during sinus rhythm (SR) and atrial fibrillation (AF). (A) Comparison of the atrial signal amplitudes between different electrode locations. *p < 0.05. Solid bar = all; open bar = LRA-MCS; striped bar = MRA-DCS. (B) Comparison of the atrial signal amplitude during supine and upright posture. *p < 0.05. Solid bar = supine; open bar = upright. DCS = distal coronary sinus; LRA = mid-right atrium; MCS = midcoronary sinus; MRA = mid-right atrium.