“…HRQOL has become an increasingly important outcome measure in patients with cardiovascular disease and is frequently used in evaluating benefits of treatment [19]. Studies have shown good HRQOL outcomes after PCI [4,20,21], but results in elderly patients remain limited [8,12,22,23,24,25,26,27,28,29,30]. Considering that life expectancy is 17.1 years at the age of 65 and 8.2 years at the age of 80 [1], there is a significant opportunity for elderly patients to improve their HRQOL if they are offered intervention.…”