Figure 3.

Left: PV recordings from the Achieve CMC during sinus rhythm and diagrammatic representation of potential far-field electrogram sources. Right: Simultaneous Achieve small-caliber CMC and duodecapolar circular mapping catheter CMC recordings from the LSPV during distal coronary sinus pacing. Note the PV electrogram morphology is less sharp, with more far-field recordings. A = atrial far-field signal; CMC = circular mapping catheter; LA = left atrium; LAA = left atrial appendage; LIPV = left inferior pulmonary vein; LSPV = left superior pulmonary vein; PV = pulmonary vein; PVP = pulmonary vein potential; RIPV = right inferior pulmonary vein; RSPV = right superior pulmonary vein; SVC = superior vena cava.