Abstract
Whether slow pathway (SP) ablation is a valuable approach for rate control of atrial fibrillation (AF) remains unknown. The study included 38 patients with AV node reentrant tachycardia (AVNRT) in whom AF was induced at baseline, 30 min and one week after SP ablation. We determined minimum and maximum cycle length (minCL and maxCL) and the duration of the induced episode of AF. AVNRT was successfully abolished in all 38 patients after SP ablation. Abolition of the SP was associated with an increase of minCL during AF from 353 ± 74 ms to 422 ± 81 ms (p < 0.01) after 30 min, and to 480 ± 99 ms (p < 0.01) after one week. MaxCL (504 ± 125 ms) increased to 667 ± 173 ms (p < 0.01). and to 814 ± 467 ms (p < 0.01) respectively. SP ablation reduced the duration of an AF episode (55 ± 93s) to 14 ± 13s (ns) and to 15 ± 16s (ns). No significant difference was observed between the immediate and follow-up results after one week although a tendency towards higher CL was demonstrated.
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