Нe feasibility of percutaneous coronary intervention (PCI) in complex substrate of population has increased over the previous decade. With technological advancement in stenting, increasing expertise, better antithrombotic agents and widely use of radial access, PCI-related abrupt vessel closure, acute stent thrombosis, and access site vascular complications have decreased. PCI can now be performed in the ambulatory settings in stable patients as a "same-day" procedure. Compared to overnight observation, same-day discharge (SDD) aіer PCI is associated with lower post-procedural complications, leading to lower healthcare costs and better patient satisfaction. Нe utility of non-procedural patient characteristics in predicting post-PCI adverse events in this subset of patients has not been systematically evaluated and may allow the operators to identify high-risk patients and can guide in the decision-making for SDD. We sought to analyze the non-procedural patient characteristics in predicting in-hospital complications following elective PCI from the Nationwide Inpatient Sample (NIS). Нe NIS database, developed and managed by the Agency for Healthcare Research and Quality (AHRQ) Healthcare Cost and Utilization Project (HCUP), is the largest, all-payer database in the United States. Prior to 2012, the NIS represents 20% stratified sample of all community and nonfederal US hospitals. From 2012, the NIS was significantl\ redesigned to represent 20% stratified discharges of all community US hospitals.