Catheter ablation of ventricular tachycardia in patients with right ventricular dysplasia: Identification of target sites by entrainment mapping techniques.
OBJECTIVE
To identify target sites for radiofrequency ablation of ventricular tachycardia (VT) by entrainment mapping techniques in patients with arrhythmogenic right ventricular dysplasia.


METHODS
Entrainment mapping and radiofrequency ablation of eight VTs was performed in seven patients. Radiofrequency ablation was applied at 31 reentry circuits sites that were classified based on findings during entrainment.


RESULTS
By entrainment criteria the 31 sites were classified as: exit sites (n = 12), proximal sites (n = 6), and outer loop sites (n = 13). Radiofrequency current application terminated VT at 7 of 31 sites: 2 of 12 exit sites (17%), 4 of 6 proximal sites (67%), and 1 of 13 outer loop sites (8%).


CONCLUSIONS
Radiofrequency ablation terminated VTs most often at sites proximal to the exit as opposed to outer loop sites and exit sites (P = 0.05). The critical isthmus for ablation of VT in right ventricular dysplasia often may be distant to the exit.
Harada
T
T
Toyoko Hospital, St. Marianna University School of Medicine, Kawasaki, Japan.
Aonuma
K
K
Yamauchi
Y
Y
Igawa
M
M
Hachiya
H
H
Oh
J C
JC
Tomita
Y
Y
Suzuki
F
F
Nakagawa
T
T
D019571:Arrhythmogenic Right Ventricular Dysplasia / Q000150:complications* / Q000503:physiopathology; D002304:Cardiac Pacing, Artificial; D017115:Catheter Ablation; D004562:Electrocardiography; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D017180:Tachycardia, Ventricular / Q000175:diagnosis / Q000209:etiology / Q000601:surgery*