Chronologic evolution and prognostic implications of impaired coronary flow after chronic total occlusion angioplasty.

"Conflicts of Interest: All authors have completed the ICMJE uniform disclosure form (available at https://cdt.amegroups.com/article/view/10.21037/cdt-23-161/coif). The authors have no conflicts of interest to declare."

"Funding: This study was supported by the National Program on Key Basic Research Project of China ( No. 2019YFC0840601 ), National Natural Science Foundation of China ( Nos. 82170338, 81970295, 81870267, 81521001 and 81670318 ), Shanghai Clinical Research Center for Interventional Medicine ( No. 19MC1910300 ), Grant of Shanghai Shenkang on Key Clinical Research Project ( Nos. SHDC2020CR2015A and SHDC12019104 ), Grant of Shanghai Science and Technology Committee ( No. 20JC1410800 ), Key Medical and Health Projects of Xiamen City ( No. 3502Z20204004 ), and Grant of Zhongshan Hospital Affiliated to Fudan University ( Nos. 2018ZSLC01 and 2021ZSGG07 )."