Prognostic Impact of Periprocedural Bleeding and Myocardial Infarction After Percutaneous Coronary Intervention in Unselected Patients. Results From the EVENT (Evaluation of Drug-Eluting Stents and Ischemic Events) Registry

Objectives: Our aim was to examine the prognostic importance of hemorrhagic and ischemic complications after percutaneous coronary intervention (PCI) in unselected patients. Background: In randomized trials of PCI, major bleeding and periprocedural myocardial infarction (pMI) have been associated with increased mortality. Whether similar associations exist among un-selected PCI patients is unknown. Methods: We used data from the EVENT (Evaluation of Drug Eluting Stents and Ischemic Events) registry-a multicenter registry of unselected patients undergoing PCI-to examine the association between both in-hospital bleeding and pMI and 1-year mortality. Cardiac enzyme levels were assessed in all patients, and pMI was defined as a peak creatine kinase-MB value ≥3× the upper limit of normal. Post-PCI bleeding was classified by Thrombolysis In Myocardial Infarction criteria. Results: After excluding patients with elevated pre-PCI creatine kinase-MB values and ST-segment elevation myocardial infarction at presentation (n = 1,626), a total of 5,961 patients were available for evaluation. Rates of post-PCI bleeding and pMI were 3.0% and 7.1%, respectively; 1-year all-cause mortality was 2.8%. After multivariable adjustment, both post-PCI bleeding (adjusted hazard ratio [HR]: 3.83, 95% confidence interval: 2.48 to 5.90, p < 0.001) and pMI (adjusted HR: 1.84, 95% confidence interval: 1.17 to 2.89, p = 0.009) were independently associated with 1-year mortality. Time period-specific analyses demonstrated that the adjusted HR for bleeding was similar for 30-day mortality and mortality between 1 month and 1 year, while the adjusted HR for pMI was greater for 30-day mortality as compared with mortality between 1 month and 1 year. Conclusions: Among unselected PCI patients, both post-PCI bleeding and pMI are independently associated with increased 1-year mortality. Continued efforts to reduce these complications after PCI are warranted.