Catheter ablation of ventricular tachycardia after myocardial infarction achieved similar acute success rates for stable (69%) and unstable (64%) VTs (p=0.42).
Cohort (n=30)
Does a targeted catheter ablation strategy yield similar acute success and recurrence rates for stable versus unstable ventricular tachycardias in patients with previous myocardial infarction?
Catheter ablation targeting only previously documented VTs and those with similar or longer cycle lengths yields comparable acute success and recurrence rates for both stable and unstable VTs in post-MI patients.
Absolute Event Rate: 69% vs 64%
p-value: p=0.42
OBJECTIVE: Catheter ablation of ventricular tachycardia (VT) after myocardial infarction (MI) can be complex and time-consuming. We only targeted the previously documented VTs and those with similar or longer cycle lengths. METHODS: 30 patients with VTs after MI were included in the study. Voltage mapping was performed using an electro-anatomic mapping system (CARTOT). Stable VTs were mapped during tachycardia and unstable VTs during sinus rhythm. RESULTS: Clinical VTs were stable in 16 (53%) and unstable in 14 (47%) patients, and ablation was successful in 11 (69%) and 9 patients (64%), respectively (p = 0.42). During follow-up (14 +/- 6 months), 4 patients (25%) treated for stable and 6 (43%) for unstable VTs had recurrences (p = 0.82); ablation was successful in none and 2 (33%) of them, respectively. Non-target VTs were inducible in 11 (55%) of 20 patients after successful ablation and non-inducible in 9 (45%). During follow-up, inducibility of non-target VTs did not predict recurrences (9 vs. 11%, p = 0.88). CONCLUSIONS: Catheter ablation of VTs after MI can be successfully performed. Acute success rates seem to be similar for stable and unstable VTs. VTs faster than those documented clinically exert a minor effect on VT recurrences during follow-up.
Ventura et al. (Tue,) conducted a cohort in Ventricular tachycardia after myocardial infarction (n=30). Catheter ablation vs. Stable vs unstable VTs was evaluated on Acute ablation success (p=0.42). Catheter ablation of ventricular tachycardia after myocardial infarction achieved similar acute success rates for stable (69%) and unstable (64%) VTs (p=0.42).