Coronary perforation occurring during a CTO PCI is a rare complication with potential major adverse cardiac events. The long-term clinical and angiographic outcome of such perforation that needs sealing with a covered stent, has to be refined in a large international registry. The purpose of this study, sponsored by the University of Mons with an unrestricted educational grant from the ML CTO Academy, is to describe in a large international collaborative network the occurrence and outcome of coronary perforations complicating a CTO procedure.

The objective of the registry is to collect retrospective multicentric observational data of a rare major adverse event that can occur during a percutaneous coronary intervention (PCI) for the treatment of a chronically occluded coronary artery (CTO). As such a power calculation is not indicated, we will collect the events from all centers willing to participate in this collective registry.