4. Functional components of reentry circuits. (Stevenson 1996).

12. The non inflated balloon catheter on the left, the inflated balloon catheter in the middle and a magnified electrode on the balloon array on the right. (Schilling et al., 1998).

16. Functional components of reentry circuits. (Stevenson 1996). With target ablation by isolated RF applications demo-nstrated

17. Group II: The next 8 patients with 12 targeted VTs, 9 of them with RBBB morphology, CL 445 ± 93 ms) in whom Modification of the arrhythmogenic substrate by linear or area RF ablation according to the substrate mapped by Ensite.

23. RESULTS 79 RF, 4-24 (9.3 ± 4.9) RF applications (P < 0.001). 7-40 pulses, total 142 (17.5±12.2) (p= 0.067). 36-97 (64.8 ±18.8) min (p. 0.766). 345-630 min., 437,67 ± 89.6 min (p. 0.766) Group II (31 pulses) had a mean of 4.4 ± 2.2. 77 RF applications (mean of 8.7 ± 3.8 per patient) 48 –116 min,77.6 ± 20.5 min) 300-480 min., 397± 64.9 min Group I RF pulses in sinus rhythm Total RF pulses X-ray exposure time Procedurduration

25. The figure, shows exit of a VT as shown by the Ensite isopotential colour coded map and a line of ablation lesions extended from the exit through the diastolic pathway inside the scar in a patient with anterior infarction. On the left is the virtual endocardium in RAO with some rotation to show the line of ablation on the anterior wall. On the right are the surface (upper three) , local catheter recoeded (the middle two), and virtual electrograms (the lower four electrograms).

31. Compared outcome throughout the follow up period 52% 16, 76.5% 21 All patients: in our study 9(75%) P.=0.028 10(83%) P.= 0.032 0 0 10(83%) P.= 0.585 12 Group II 2 (22%) 3 (33%) 2 (22%) 1(11%) 6 (66%) 9 Group I Long term ablated VT s Discharge resul(7 days post Ab.) Reinducible VTs in control EPS Early recurrences Acutely ablated VTs Targeted VTs

32. Compared outcome throughout the follow up period

36. Thank you