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Background or Purpose: Different atrial tachyarrhythmias (AT) may be seen during follow-up after atrial fibrillation ablation. Evaluate and analyze characteristics and management of AT following first atrial fibrillation (AF) ablation with high-power short-duration (HPSD) comparing to low-power long-duration (LPLD) and its impact on late outcome.Methods: Observational, retrospective study, 144 patients submitted to HPSD and LPLD ablation. HPSD with 71 and LPLD with 73 patients and no major clinical differences between the two groups.Results: AT occurred in 60 patients (41.67%) in entire follow-up. HPSD 22 patients had AT: 13 during blanking period (BP) and 9 after that. LPLD: 38 patients with AT, 14 during BP and 24 after that. During BP, HPSD showed high rate of atrial flutter/tachycardia in 9 (69.23) of 13 and LPLD 4 (28.57%) of 14 patients. At 12 months' follow-up, 62 (87.32%) of 71 HPSD patients were in sinus rhythm comparing to 49 (67.12%) of 73 patients in LPLD.Conclusions: HPSD ablation produced higher rates of early than late recurrence comparing to LPLD. Regular tachyarrhythmias were most common arrhythmia during BP with HPSD ablation and AF in LPLD. HPSD compared to LPLD showed a superiority in maintaining sinus rhythm at 12 months. [ABSTRACT FROM AUTHOR]