Cycle length dependent block in the "mitral-pulmonary vein" isthmus.
We report a case of cycle length dependent activation sequence in the coronary sinus catheter during assessment of mitral-pulmonary vein isthmus block. A 61-year-old patient presented with atrial tachycardia following a recent pulmonary vein isolation for paroxysmal atrial fibrillation. A perimitral macroreentrant atrial tachycardia was demonstrated during mapping. The isthmus block observed following initial ablation of the mitral-pulmonary vein appeared to be pacing cycle dependent and to our knowledge has not been previously described.
Lim
Kang-Teng
KT
Hôpital Cardiologique du Haut-Lévêque and the Université Victor Segalen Bordeaux II, Bordeaux, France.
Jaïs
Pierre
P
O'Neill
Mark D
MD
Knecht
Sebastian
S
Matsuo
Seiichiro
S
Arantes
Leonardo
L
Kodali
Sathish
S
Hocini
Mélèze
M
Klein
George
G
Clémenty
Jacques
J
Haïssaguerre
Michel
M
D000328:Adult; D001281:Atrial Fibrillation / Q000175:diagnosis* / Q000601:surgery*; D017115:Catheter Ablation / Q000379:methods*; D006329:Heart Conduction System / Q000601:surgery*; D006801:Humans; D011667:Pulmonary Veins / Q000601:surgery*; D016896:Treatment Outcome