Radiofrequency catheter ablation of common atrial flutter: role of the eustachian valve.
BACKGROUND
During radiofrequency catheter ablation of a common atrial flutter between the tricuspid annulus and the Eustachian valve "septal isthmus", double potentials were recorded along the Eustachian valve, previously described as an anatomical line of conduction block between the coronary sinus ostium and the inferior vena cava.


RESULTS
Just before flutter termination, lengthening and beat to beat delay variations between the 2 components of the double potentials were correlated with simultaneous modifications of the flutter cycle length.


CONCLUSIONS
The "septal isthmus" is a common pathway for the flutter wavefront and the impulse generating the second component of the double potential. It is also a good target for flutter ablation.
Halimi
F
F
Department of Cardiology, Hôpital Jean Rostand, Ivry sur Seine, France.
Hidden-Lucet
F
F
Tonet
J
J
Fontaine
G
G
Frank
R
R
D000328:Adult; D001282:Atrial Flutter / Q000503:physiopathology* / Q000601:surgery*; D017115:Catheter Ablation; D004562:Electrocardiography; D006801:Humans; D008297:Male; D014682:Vena Cava, Inferior / Q000503:physiopathology*