Characterization of Left Atrial Substrate by Comparison of Bipolar Voltage Maps With Standard Focal 4.5 mm Tip Electrode, 1 mm Ring Electrode, and Microelectrode Catheters Using InTEllaMap Orion and IntellaNav MIFI O

mapping of the left atrium will be performed in sinus rhythm using the IntellaMap Orion multipolar mapping catheter (Boston Scientific).

mapping of the left atrium will be performed using the multielectrode circular catheter (Lasso, spacing 2-6-2 mm, Biosense Webster)

mapping of the left atrium will be performed using the irrigated ablation catheter (IntellaNav Mifi OI)