Association Between Diagnosis‐to‐Limb Revascularization Time and Clinical Outcomes in Outpatients With Chronic Limb‐Threatening Ischemia: Insights From the CLIPPER Cohort

Abstract

Background The extent and consequences of ischemia in patients with chronic limb‐threatening ischemia (CLTI) may change rapidly, and delays from diagnosis to revascularization may worsen outcomes. We sought to describe the association between time from diagnosis to endovascular lower extremity revascularization (diagnosis‐to‐limb revascularization [D2L] time) and clinical outcomes in outpatients with CLTI. Methods and Results In the CLIPPER cohort, comprising patients between 66 and 86 years old diagnosed with CLTI betweeen 2010 and 2019, we used Medicare claims data to identify patients who underwent outpatient endovascular revascularization within 180 days of diagnosis. We described the risk‐adjusted association between D2L time and clinical outcomes. Among 1 130 065 patients aged between 66 and 86 years with CLTI, 99 221 (8.8%) underwent outpatient endovascular lower extremity revascularization within 180 days of their CLTI diagnosis. Among patients with D2L time <30 days, there was no association between D2L time and all‐cause death or major lower extremity amputation. However, among patients with D2L time >30 days, each additional 10‐day increase in D2L time was associated with a 2.5% greater risk of major amputation (hazard ratio, 1.025 [95% CI, 1.014–1.036]). There was no association between D2L time and all‐cause death. Conclusions A delay of >30 days from CLTI diagnosis to lower extremity endovascular revascularization was associated with an increased risk of major lower extremity amputation among patients undergoing outpatient endovascular revascularization. Improving systems of care to reduce D2L time could reduce amputations.