Figure 5. Representative images of pre- and post-isolation electroanatomic maps collected with an ultra-high definition mapping system and 64 electrode basket mapping catheter. Maps were collected by a single operator during a 28mm FROZEN AF case and a FIT Extension arm case where the 31mm configuration was used for all PVs. Fractional antral was calculated based on (PV^pre-PV^post)/PV^pre, Voltage Bracket 0.1mV-0.5mV, scar defined as <0.1mV.