G. Lauck et al., Radiofrequency catheter ablation of symptomatic ventricular ectopic beats originating in the right outflow tract, PACE, 22(1), 1999, pp. 5-16
Citations number
20
Categorie Soggetti
Cardiovascular & Respiratory Systems","Cardiovascular & Hematology Research
Ectopic activity originating in the right ventricular outflow tract is a fr
equent finding and may result in severe symptoms such as dyspnea, palpitati
ons, and lack of physical capacity correlated with a low cardiac output. In
12 consecutive symptomatic and drug refractory patients, we performed a st
udy with intracardiac mapping and ablation procedure. The origin of the ect
opic beats was identified, and the ablation procedure was performed. Patien
ts were examined by serial EGG, Holter EGG, bicycle EGG, echocardiography,
and thoracic X ray. At baseline, the mean number of ectopic beats was 23,82
3 during Holter EGG. No other arrhythmias were present. Patients underwent
basic electrophysiological study, mapping process, and ablation in a single
procedure. Ablation was performed with a deflectable thermocoupled cathete
r with tip electrodes of 4 mm. Criteria for identification of the origin of
the ectopic beats included pace mapping with 12 leads and earliest endocar
dial activation. One male patient suffered from myocarditis; the other 11 p
atients had no underlying structural heart disease. The mean age was 38 yea
rs. Ablation procedure with delivered temperature of 70 degrees C was succe
ssful in 11 of 12 patients eliminating the focus. The mean procedural time
was 79 +/- 34 minutes; mean fluoroscopy time was 13.8 +/- 8.8 minutes; and
mean number of applications was 4.4 +/- 2.8. No adverse effects occurred du
ring a follow-up period of 10 months after ablation. The mean number of ect
opic beats per 24 hours after ablation was 317 +/- 599 with a P value of 0.
00024. The clinical symptoms improved in all but one patient. One patient h
ad a recurrence after 2 months that could be successfully treated by a seco
nd procedure. in our experience, temperature guided radiofrequency catheter
ablation is safe and effective for the treatment of patients with symptoma
tic ectopic activity of the right outflow tract. As long as we lack the exp
erience of a greater patient cohort and a longer follow-up, only drug resis
tant and highly symptomatic patients should be selected.