In the article “Impact of catheter ablation in patients with atrial flutter and concurrent heart failure,” by Chinmay Jani, Shilpkumar Arora, and Zachary Zuzek, et al, published in the February 2021 issue of Heart Rhythm O2 (Volume 2, Issue 1, pp 53-63, doi: https://doi.org/10.1016/j.hroo.2020.11.005), figures 3 and 4 were inadvertently switched. The online version of the article has been updated with the correct figure placement. The error is regretted.