Radio frequency Catheter Ablation of Ventricular Tachy
cardia from Right Ventricular Outflow Tract
RUNGROJ KRITTAYAPHONG,MD*, CHARN SRIRATANASATHAVORN,MD**,
CHATKANOK DHUMVIBHAT, MD**, THITIMA NUT AKUL, MD***,
SANS ERN CHARERNTHAI, BSc**, CHARUW AN KANGKAGATE, MSc**
Affiliation : * Division of Cardiology, Department of Medicine,
** Her Majesty Cardiac Center,
***Department of Anesthesiology, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok 10700, Thailand.
AbstractFrom January 1996 to May 2002, 61 patients with ventricular tachycardia from right ven
tricular outflow tract were referred to Siriraj hospital. All patients underwent clinical examination,
Doppler echocardiography and electrophysiologic study. Mapping of ventricular tachycardia was per
formed by activation mapping and pacemapping. There were 44 females and 17 males with an average
age of 41.7 ± 9.9 years. Presenting symptoms were palpitation (95.1%), presyncope (39.3%), and
syncope (26.2% ). Six patients were found to. have underlying cardiac disease. Radio frequency catheter
ablation was successful in 56 patients (91.8%). There were no major complications. Seven patients
(12.5%) had recurrent ventricular tachycardia. Five of them were successfully reablated. The authors
concluded that radiofrequency ablation is an effective treatment in patients with ventricular tachycardia
from right ventricular outflow tract.
Keywords : Radiofrequency Ablation, Ventricular Tachycardia
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