Objectives: This study sought to investigate the prevalence and impact of acute kidney injury (AKI) in elderly patients undergoing percutaneous coronary intervention (PCI).
Background: AKI may complicate PCI and has been associated with worse outcomes. Data on AKI following PCI in elderly patients are scarce.
Methods: A total of 458 elderly (≥80 years) patients undergoing PCI at Charité-University Medicine Berlin between January 2009 and December 2014 were stratified according to the presence/absence of AKI. The primary endpoint was all-cause mortality. The secondary endpoint was rate of major adverse cardiovascular events (MACE), a composite of all-cause mortality, non-fatal myocardial infarction, non-fatal stroke, and rehospitalization for heart failure. Median follow-up was 280 (interquartile range 22-1190) days.
Results: Of the 458 patients, 125 (27.3%) developed AKI following PCI. Age >90 years, congestive heart failure, and C-reactive protein at presentation emerged as independent predictors of AKI. All-cause mortality was 20.0% and 8.4% in patients with and without AKI (P = 0.001), and corresponding rates of MACE were 39.2% and 26.4% (P = 0.01), respectively. The occurrence of AKI was associated with an increased risk of all-cause mortality (adjusted HR 2.41, 95%CI 1.12-5.17, P = 0.02) and MACE (adjusted HR 1.75, 95%CI 1.15-2.67, P = 0.01).
Conclusions: AKI occurs in a third of elderly (≥80 years) patients undergoing PCI and is associated with increased mortality. These findings underline the unmet clinical need to identify novel strategies for the prevention of AKI in this high-risk patient subset.
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