Organization, structure and data of the Hellenic Heart Registry on Percutaneous Coronary Interventions: a step forward towards outcomes research.

Introduction: The Hellenic Heart Registry on Percutaneous Coronary Interventions (HHR-PCI) was a prospective, observational registry of patients with stable angina or acute coronary syndromes who underwent percutaneous coronary intervention (PCI) between January 2008 and October 2010.

Methods: HHR-PCI was a database that used a secure web-based interface for data entry by individual users. All PCI centers and operators were invited to participate.