Upper extremity ischemia and hemodialysis vascular access

Area of Science:

• Vascular Surgery
• Nephrology
• Interventional Radiology

Background:

• Digital ischemia is a rare complication in dialysis patients with arteriovenous fistulas (AVF), affecting approximately 4% of individuals.
• The underlying cause differs from typical lower limb ischemia, involving blood diversion through the AVF, leading to distal hypoperfusion.
• Symptoms include pain, discoloration, and ulceration of distal tissues.

Purpose of the Study:

• To highlight the diagnostic importance of non-invasive and angiographic methods for arteriovenous fistula (AVF)-induced digital ischemia.
• To review treatment strategies aimed at alleviating symptoms and promoting healing in affected patients.
• To identify the most effective interventions for managing this condition.

Main Methods:

• Non-invasive diagnostic techniques to assess blood flow and vascular integrity.
• Angiographic evaluation to visualize the arteriovenous fistula and identify steal phenomena.
• Review of interventional and surgical procedures for managing AVF-related ischemia.

Main Results:

• High-flow AVFs present a greater risk, but normal-flow AVFs combined with peripheral arteriosclerotic disease can also precipitate ischemia.
• Interventional techniques to augment arterial inflow and surgical procedures to reduce AVF blood flow can effectively treat digital ischemia.
• Bypassing the arteriovenous anastomotic site and ligating the artery distal to the anastomosis provide optimal results by interrupting the steal phenomenon.

Conclusions:

• Accurate diagnosis of AVF-induced digital ischemia is crucial for selecting appropriate treatment.
• A combination of interventional and surgical approaches, particularly bypass and ligation, offers the most effective management for digital ischemia in dialysis patients.
• Interruption of the steal phenomenon is key to successful treatment and healing of ulcers.