Venous Arterialization-Based Extracorporeal Perfusion for Chronic Limb-Threatening Ischemia: A Retrospective...

Background/Objectives: Chronic limb-threatening ischemia (CLTI) represents the most severe stage of peripheral arterial disease and is associated with high risks of limb loss. Novel approaches are needed for patients who are not candidates for conventional revascularization. This study is to evaluate the clinical efficacy of a venous arterialization-based extracorporeal perfusion technique in patients with CLTI. Methods: A retrospective single-centre, non-randomised comparative cohort study was conducted involving 76 patients with chronic limb-threatening ischemia (CLTI), retrospectively assigned into a perfusion group (n = 38) and a control group (n = 38), with longitudinal pre-/post-treatment assessments at baseline and Day 7 and 6-month limb-salvage follow-up. Patients in the perfusion group received daily extracorporeal perfusion for 6 h over 7 consecutive days. Clinical efficacy was assessed by comparing pre- and post-treatment changes in ankle-brachial index (ABI), transcutaneous oxygen pressure (TcPO₂), skin temperature, wound area, and Visual Analogue Scale (VAS) pain scores. Limb salvage rates were recorded at 6-month follow-up. Results: The perfusion group exhibited significant improvements in ankle-brachial index (ABI) (increase of 0.20 ± 0.02 vs. 0.02 ± 0.01 in the control group, p < 0.001), transcutaneous oxygen pressure (TcPO₂) (increase of 5.24 ± 0.35 mmHg vs. 0.10 ± 0.04 mmHg, p < 0.001), skin temperature (increase of 1.19 ± 0.09 °C vs. 0.02 ± 0.01 °C, p < 0.001), The mean wound healing rate at 7 days was significantly higher in the perfusion group (23.16 ± 2.30%) compared to the control group (5.62 ± 1.23%) (p < 0.001), and Visual Analogue Scale (VAS) score improvement (3.05 ± 1.01 vs. 1.29 ± 0.61, p < 0.001) compared with the control group. The 6-month limb salvage rate was significantly higher in the perfusion group (86.8% vs. 26.3%, p < 0.001), complete wound healing was achieved in 57.9% of the perfusion group versus 10.5% of the control group (p < 0.001). Conclusions: Venous arterialization-based extracorporeal perfusion significantly improves microcirculation and clinical symptoms in CLTI patients and may serve as an effective adjunctive therapy to enhance limb salvage outcomes.