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Catheter placement for pacing and recording: (A) The schematic shows the positions of decapolar, quadripolar, and duodecapolar catheters in the coronary sinus (CS), high right atrium (HRA), and left atrium (LA), respectively; additional panels show a typical case with fluoroscopic (B) left anterior oblique and (C) right anterior oblique views. HRA: high right atrium; LAs: left atrium septum; LAl: lateral left atrium; CSp: proximal coronary sinus; CSd: distal coronary sinus
