Percutaneous thrombectomy for acute limb ischemia is associated with equivalent limb and mortality outcomes compared with open thrombectomy

Acute limb ischemia (ALI) carries a 15-20% risk of combined death or amputation at 30 days and 50-60% at 1 year. Percutaneous mechanical thrombectomy (PT) is an emerging minimally invasive alternative to open thrombectomy (OT). However, ALI thrombectomy cases are omitted from most quality databases, limiting comparisons of limb and survival outcomes between PT and OT. Therefore, our aim was to compare in-hospital outcomes between PT and OT using the National Inpatient Sample (NIS).We analyzed survey-weighted NIS data (2015-2020) to include emergent admissions of aged adults (50+ years) with a primary diagnosis of lower extremity ALI undergoing index procedures within two days of hospitalization. We excluded hospitalizations with concurrent trauma or dissection diagnoses and index procedures using catheter-directed thrombolysis. Our primary outcome was composite in-hospital major amputation or death. Secondary outcomes included in-hospital major amputation, death, in-hospital reintervention (including angioplasty/stent, thrombolysis, PT, OT, or bypass), and extended length of stay (eLOS; defined as LOS >75th percentile). Adjusted odds ratios (aORs) with 95% confidence intervals (95%CI) were generated by multivariable logistic regression, adjusting for demographics, frailty (Risk Analysis Index), secondary diagnoses including atrial fibrillation and peripheral artery disease (PAD), hospital characteristics, and index procedure data including the anatomic thrombectomy level and fasciotomy. A priori subgroup analyses were performed using interaction terms.We included 23,795 survey-weighted ALI hospitalizations (mean age 72.2 years, 50.4% female, 79.2% White, 22.3% frail) with 7,335 (30.8%) undergoing PT. Hospitalization characteristics for PT vs OT differed by atrial fibrillation (28.7% vs 36.5%, p<.0001), frequency of intervention at the femoropopliteal level (86.2% vs 88.8%, p=.009), and fasciotomy (4.8% vs. 6.9%, p=.006). In total, 2,530 (10.6%) underwent major amputation or died. Unadjusted (10.1% vs 10.9%, p=.43) and adjusted (aOR=0.96 [95%CI, 0.77-1.20], p=.74) risk did not differ between groups. PT was associated with increased odds of reintervention (aOR=2.10 [95%CI 1.72-2.56], p<.0001) when compared to OT, but this was not seen in the tibial subgroup (aOR=1.31 [95% CI, 0.86-2.01], p=.21, pinteraction<.0001). Further, 79.1% of PT hospitalizations undergoing reintervention were salvaged with endovascular therapy. Lastly, PT was associated with significantly decreased odds of eLOS (aOR=0.80 [95%CI 0.69-0.94], p=.005).PT was associated with comparable in-hospital limb salvage and mortality rates compared to OT. Despite an increased risk of reintervention, most PT reinterventions avoided open surgery and PT was associated with a decreased risk of eLOS. Thus, PT may be an appropriate alternative to OT in appropriately selected patients.