Adverse clinical events after percutaneous coronary intervention in very elderly patients with acute coronary syndrome.

The number of very elderly patients with acute coronary syndrome (ACS) is increasing. Therefore, owing to the need for evidence-based treatment decisions in this population, this study aimed to examine the clinical outcomes during 1 year after percutaneous coronary intervention (PCI) in very elderly patients with ACS. This prospective multicenter observational study comprised 1337 patients with ACS treated with PCI, classified into the following four groups according to age: under 60, <60 years; sexagenarian, ≥60 and <69 years; septuagenarian, ≥70 and <80 years; and very elderly, ≥80 years. The primary endpoint was a composite of the first occurrence of all-cause death, nonfatal myocardial infarction, nonfatal stroke, and bleeding within 1 year after PCI. We used the sexagenarian group as a reference and compared outcomes with those of the other groups. The incidence of the primary endpoint was significantly higher in the very elderly group than in the sexagenarian group (36 [12.7%] vs. 24 [6.9%], respectively; hazard ratio, 1.94; 95% confidence interval: 1.16-3.26; p = 0.012). The higher incidence of the primary endpoint was primarily driven by a higher incidence of all-cause death. When the multivariable analysis was used to adjust for patient characteristics and comorbidities, no difference was observed in the primary endpoint between the very elderly and sexagenarian groups (p = 0.96). The incidence of adverse events after PCI, particularly all-cause death, in very elderly patients with ACS was high. However, if several confounders are adjusted, comparable outcomes may be expected within 1 year after PCI among this population.