Electrophysiologic study and radiofrequency catheter ablation of isthmus-independent atrial flutter.
We report the electrophysiologic study and radiofrequency catheter ablation of isthmus-independent atrial flutter in 2 patients. The isthmus-independent atrial flutter in these 2 patients had similar ECG and electrophysiologic findings. Both were reproducibly induced by rapid atrial pacing. The atrial activation sequence and entrainment study proved that these atrial flutters were not isthmus-dependent. A high-right atrial site was identified as the critical site of the slow conduction zone of the tachycardia in both. This site showed double potentials and mid-diastolic potentials. Radiofrequency catheter ablation at this site successfully eliminated the isthmus-independent atrial flutter in both patients.
Lai
L P
LP
Department of Internal Medicine, National Taiwan University Hospital, Taipei.
Lin
J L
JL
Tseng
C D
CD
Huang
S K
SK
D001282:Atrial Flutter / Q000503:physiopathology / Q000601:surgery*; D006328:Cardiac Catheterization; D017115:Catheter Ablation; D004594:Electrophysiology / Q000379:methods*; D005500:Follow-Up Studies; D006325:Heart Atria / Q000503:physiopathology*; D006329:Heart Conduction System / Q000503:physiopathology* / Q000601:surgery; D006801:Humans; D008297:Male; D008875:Middle Aged; D015203:Reproducibility of Results