Acquires data simultaneously from an entire cardiac chamber often in a single cardiac cycle.
-Multiple foci
-Unique anatomy (atriotomy scar)
Non contact Multi Electrode Array, a reference patch electrode, a workstation
Can simultaneously reconstruct more than 3000 electrograms translating into a 3D graphical representation of the cardiac chamber, either in an isochronal or isopotential mode

9 Fr catheter (10 Fr sheath), consists of 7.5 mL Ellipsoid balloon surrounded by 64 electrically insulated wires. Each wire has a break in its insulation allowing it to function as a
unipolar electrode. The unipolar signals are recorded using a ring electrode as reference.