Pain in a hemodialysis fistula is most likely caused by which condition?

• A. Thrombosis
• B. Infection
• C. Ischemia
• D. Stenosis

Answer: (C)

Pain in a hemodialysis fistula is most likely due to ischemia of the distal limb caused by the fistula stealing blood away from the hand. The fistula creates a high-flow, low-resistance pathway for blood, and if arterial inflow can’t meet the demand of both the fistula and the hand, tissues in the hand become ischemic, leading to pain, pallor, and sometimes coldness or numbness, especially during dialysis when flow demands are higher.

Thrombosis would more often present with a sudden loss of the access’s thrill and bruit and a blocked flow, rather than a pattern of distal ischemic pain. Infection would bring warmth, redness, tenderness, swelling, and possibly fever or purulent drainage. Stenosis reduces flow and dialysis effectiveness and may cause a dull ache or decreased thrill/bruit, but the hallmark symptom is not distal ischemic pain.