Impedance drop determines ablation lesion volume at the same level of ablation index

Abstract New parameters such as ablation index (AI) have been developed to create reliable lesions. This study was performed evaluate whether RF energy delivery with the same creates similar lesion volume. Ablation lesions were created in 5 pig hearts at ex-vivo state. using an external-irrigation contact-force sensing catheter on epicardial side of left ventricle 90-degree angle. time adjusted for targeting AI 600 8 different conditions. Lesion volume 0–5 g contact force 20 W significantly lower than that 11–20 40W despite (125 ± 76.2 vs. 272 49.5 mm 3 , P < 0.05). Quality variable condition poor low power swine ventricle, and high-quality could be expected when impedance drop is satisfactory even though level applied during ablation.