Association and prognostic value of multi-domain frailty defined by cumulative deficit and phenotype models in patients with heart failure

Backgrounds Frailty is associated with a poor prognosis in older patients with heart failure (HF). However, multi-domain frailty assessment tools have not been established in patients with HF, and the association between the frailty phenotype and the deficit-accumulation frailty index in these patients is unclear. We aimed to understand this relationship and evaluate the prognostic value of the deficit-accumulation frailty index in older patients with HF. Methods We retrospectively analyzed the FRAGILE-HF cohort, which consisted of prospectively registered hospitalized patients with HF aged ≥65 years. The frailty index was calculated using 34 health-related items. The physical, social, and cognitive domains of frailty were evaluated using a phenotypic approach. The primary endpoint was all-cause mortality. Results Among 1,027 patients with HF (median age, 81 years; males, 58.1%; median frailty index, 0.44), a higher frailty index was associated with a higher prevalence in all domains of cognitive, physical, and social frailty defined by the phenotype model. During the two-year follow-up period, a higher frailty index was independently associated with all-cause death even after adjustment for MAGGIC score plus log-BNP (per 0.1 increase: hazard ratio, 1.21; 95% confidence interval, 1.07–1.37, P=0.002). The addition of the frailty index to the baseline model yielded statistically significant incremental prognostic value (net reclassification improvement, 0.165; 95% confidence interval, 0.012–0.318; P=0.034). Conclusions A higher frailty index was associated with a higher prevalence of all domains of frailty defined by the phenotype model and provided incremental prognostic information with preexisting risk factors in older patients with HF.