Incidence and Predictors of In-Hospital Frailty Progression in Patients with Chronic Limb-Threatening Ischemia after Endovascular Therapy: Results of the RIGEL Study

Frailty, particularly chronic limb-threatening ischemia (CLTI), is a major health concern in patients with peripheral artery disease. CLTI onset can lead to increased frailty and impaired ability to perform daily activities. However, its in-hospital frailty progression in these patients remain poorly defined. This study aims to address this knowledge gap. We analyzed 841 CLTI patients (mean age, 75.8 years; 60.2% male) who underwent endovascular therapy (EVT) and were discharged alive from a multicenter registry. Frailty was assessed at admission and discharge using the Clinical Frailty Scale (CFS), categorized as non-frail (1-3), mildly frail (4-5), or advanced frail (6-9). Frailty progression was defined as a transition to a higher frailty category during hospitalization. The predictors of frailty progression during hospitalization were assessed using logistic regression analyses. Overall, 103 patients (12.2%) experienced frailty progression. Compared to those without progression, these patients had lower left ventricular ejection fraction (LVEF), lower hemoglobin and albumin levels, and more severe wounds. Independent predictors of frailty progression included LVEF ＜40% (odds ratio [OR], 2.02), hemoglobin ＜11 g/dL (OR 1.67), and Wound Grade 3 (OR 2.04). Within 2 years after discharge, the amputation-free survival rate was significantly lower in the progression group than in the non-progression group (42.6% vs. 56.0%; log-rank p = 0.008). The wound healing rate within 2 years after EVT was also significantly lower in the progression group than in the non-progression group (78.2% vs. 88.8%; log-rank p = 0.001). In-hospital frailty progression was observed in one of the eight patients with CLTI undergoing EVT. Frailty progression was linked to more severe clinical status and worse life and limb outcomes than cases without progression.