Background
Frailty is associated with adverse outcomes in older patients with acute coronary syndrome (ACS). The impact of frailty on long-term clinical outcomes following invasive management of non-ST elevation ACS (NSTEACS) is unknown.
Methods
The multi-centre ICON-1 prospective cohort study consisted of patients aged ≥75 years undergoing coronary angiography following NSTEACS. Patients were categorised by frailty assessed by Canadian Study of Health and Ageing Clinical Frailty Scale (CFS) and Fried criteria. The primary composite endpoint was all-cause mortality, unplanned revascularisation, myocardial infarction, stroke, and bleeding.
Results
Of 263 patients, 33 (12.5%) were frail, 152 (57.8%) were pre-frail and 78 (29.7%) were robust according to CFS. By Fried criteria, 70 patients (26.6%, mean age 82.1 years) were frail, 147 (55.9%, mean age 81.3 years) were pre-frail, and 46 (17.5%, mean age 79.9 years) were robust. The composite endpoint was more common at five years among patients with frailty according to CFS (frail: 22, 66.7%; pre-frail: 81, 53.3%; robust: 27, 34.6%, p = 0.003), with a similar trend when using Fried criteria (frail: 39, 55.7%; pre-frail: 72, 49.0%; robust: 16, 34.8%, p = 0.085). Frailty measured with both CFS, and Fried criteria was associated with the primary endpoint (Age and sex-adjusted hazard ratio [HR] compared to robust groups. CFS: 2.22, 95% Confidence Interval [CI] 1.23-4.02, p = 0.008; Fried: HR 1.81, 95% CI 1.00-3.27, p = 0.048).
Conclusion
In older patients who underwent angiography following NSTEACS, frailty is associated with an increased risk of the primary composite endpoint at five years.