International Post-PCI FFR Registry for Extended Follow up Outcomes After Coronary Stenting

The investigators planned to extend the International Post-PCI FFR registry (NCT04684043) to explore the long-term prognostic value of post-PCI FFR. The International Post-PCI FFR registry (NCT04684043) already included the 2,200 patients who underwent PCI and measured post-PCI FFR between June 2011 and May 2018. As the clinical, angiographic, and physiologic data are already collected in the International Post PCI FFR registry, the investigators will further collect the most recent clinical outcome data until 2021.5 and incorporate them into the International Post-PCI FFR Extended registry. As the current study will evaluate clinical outcomes at 5 years, 2,128 patients who underwent PCI and measured post-PCI FFR between June 2011 and Nov 2016 will be included and studied. The investigators will request further clinical outcome data from 10 hospitals that provided the data for the International Post-PCI FFR registry before.

A standardized form of a spreadsheet, including standardized definitions of variables, was used to collect the individual patient data from the principal investigators of each qualified registry. Patient clinical, angiographic, and physiologic data at the time of index PCI were recorded and already collected at Seoul National University Hospital. As clinical outcome data of 2 years of follow-up after index PCI are already collected in the International Post-PCI FFR registry (NCT04684043), clinical outcome data after 2 years of index PCI will be collected by medical records until 2021.5 of each hospital. All submitted data were double-checked by a central monitoring team in Seoul National University Hospital. All patients' identifying numbers are anonymized as "Subject_No" and the investigators will request the patients' clinical outcome data using these anonymized identifying numbers of the patients. Also, the investigators will share collected data with collaborators, using these numbers.