Risk Factors and Management of Hemodialysis Associated Distal Ischemia.

ABSTRACT

BACKGROUND: Hemodialysis-associated distal ischemia (HADI) is an uncommon, but significant complication after hemodialysis access creation that might require additional intervention. This study examines the risk factors for HADI and compares the outcomes of the different treatment modalities. METHODS: The Vascular Quality Initiative hemodialysis access (2011-2019) registry was reviewed. Patients were classified based on the occurrence of HADI requiring intervention or not, and their respective characteristics were compared. Multivariable logistic regression was used to identify independent factors associated with HADI. Kaplan Meier curves of secondary patency after different modalities of surgical revision were compared. RESULTS: There were 35,236 vascular access creations and 970 (2.75%) were complicated by HADI requiring intervention. Treatment was performed with access ligation in 224 patients (23%) and catheter-based techniques in 394 (41%). Open surgical revision consisted of banding in 127 (13%), distal revascularization interval ligation (DRIL) in 196 (20%), proximalization of arterial inflow (PAI) in 15 (1.5%), and revision using distal inflow (RUDI) in 14 (1.4%). Median time to HADI was 49 days (IQR 17 -91 days). Multivariate regression demonstrated that white race, female sex, peripheral artery disease, coronary artery disease, diabetes, post-procedure antiplatelets, prosthetic grafts, upper arm access, and target vein diameter greater than 4 mm were significantly associated with increased risk for HADI. When compared to procedures without HADI, access patency was decreased when revision (excluding access ligation) was performed (secondary patency at 12 months, HADI revision versus none 89.0% vs. 92.4%, P <0.01). However, after multivariate Cox adjustment, revision for HADI was not independently significantly associated with access failure. CONCLUSION: HADI complicates 2.75% of hemodialysis access cases and is more likely in white females with diabetes and arterial disease after upper arm prosthetic graft placement. The patency of dialysis access does not seem to be negatively impacted by the various methods of surgical revision for HADI.