Figure legend
The 3D view of the anterior left atrium with bipolar voltage mapping (A)
and unipolar voltage mapping (B) with an OCTARAY ™ mapping
catheter after the EPVI. The red area is ≦0.05 mV. The cut-off value in
both A and B was 0.05mV~0.5mV. The real low voltage area may be
detected by the unipolar rather than the bipolar mapping.