Figure 1 Nonconducting Tissue Identification
A patient with sustained AT after Fanton Modification. (Movie I and
Movie II in the Data Supplement). A: Bipolar voltage threshold is set
arbitrarily 0.5 to 0.5 mV, with red representing voltage <0.5
mV and purple representing >0.5 mV. Ripple bars are seen to
propagate in the red area on the map (yellow circle). B: After
adjustment of voltage threshold, the area with propagating ripple bars
appears as purple (yellow circle), representing conductive tissue. C, D:
At this voltage setting, the ripple map of the RA during posterior
scar-related flutter in this case that clearly delineated the critical
isthmus located between the posterior scar and IVC. RA: right atrium;
SVC: superior vena cava; CS: coronary sinus; IVC: inferior vena cava.