“…For example, in Japanese centres CTO incidence was 19% and 61.2% of these cases were treated percutaneously (Yamamoto et al, 2013), however in North America, where CTOs are more frequent (29-33%), only between 6% and 9% of patients were treated percutaneously (Srinivas et al, 2002). In our study the percentage of CTO PCI procedures was low -only 6.2% of all PCI.…”