Detour conduction can mimic complete conduction block at the cavo-tricuspid isthmus.
A 54-year-old man with typical atrial flutter underwent linear ablation at the cavo-tricuspid isthmus. Though standard tricuspid annulus (TA) mapping and differential pacing suggested complete isthmus conduction block, electroanatomic mapping revealed that detoured conduction through a residual conduction gap around the inferior vena cava far from the TA mimicked complete conduction block. Though the double potential interval along the block line was not long enough to guarantee a complete line of block after eliminating the conduction gap, electroanatomic remapping accurately confirmed a complete block line, suggesting electroanatomic mapping may be the most reliable method to confirm complete isthmus conduction block.
Yamada
Takumi
T
Division of Cardiovascular Diseases, University of Alabama at Birmingham, Birmingham, Alabama 35294-0019. takumi-y@fb4.so-net.ne.jp
Murakami
Yoshimasa
Y
Plumb
Vance J
VJ
Kay
G Neal
GN
D001282:Atrial Flutter / Q000503:physiopathology* / Q000601:surgery*; D017115:Catheter Ablation; D006801:Humans; D008297:Male; D008875:Middle Aged