- Complicated PCI, defined as PCI with any of the vascular access complications (large hematoma with lump > 5 cm or requiring medical treatment; AV fistula; pseudo aneurysm requiring treatment; retroperitoneal bleeding), or PCI with any of the procedural complications (abrupt vessel closure; no-reflow phenomenon; new angiographic thrombus; new major dissection with reduced flow; catheter-related thrombus), or PCI requiring further medical treatments (urgent CABG; endotracheal intubation; unplanned in-aortic balloon pump; LVAD; covered stent; unplanned temporary pacemaker wire; administration of inotropes; CPR) , or PCI resulting in clinical events (death; stroke; myocardial infarction; stent thrombosis) during or within 24 hours after the index PCI