Insights from Temperature Feedback and Current in Ablation Index-Guided Pulmonary Vein Isolation

Objectives: To gain further knowledge of in-vivo lesion assessment and the complex regional interplay of lesion parameters during pulmonary vein isolation (PVI). Background: Although ablation index (AI) results in favourable outcomes of CLOSE protocol-guided PVI but its' relationship with other lesion parameters is not fully understood. Methods: 62 patients undergoing CLOSE-PVI (35-50W, {less than or equal to}6mm, AI 400-550) using a QDOT catheter were prospectively included. Lesion-specific data (impedance change [∆-IMP], current [mA], delivered energy [J], power [W], contact force [CF], thermocouple temperature [Temp] and micro-electrogram amplitude [ME-EGM]) were collected. Results: Although AI targets were reached for all 3166 lesions, 479 (15%) had very low ∆-IMP (