A nurse is providing discharge teaching to a client who has a new arteriovenous fistula in the right forearm. Which of the following manifestations should the nurse include in the teaching as a possible indication of venous insufficiency?

Choice A reason: A raised red rash may indicate a localized allergic reaction or dermatitis, but it is not a classic sign of venous insufficiency. It does not reflect compromised blood flow or vascular dysfunction related to the fistula. Choice B reason: Coldness and numbness distal to the fistula site suggest compromised venous return or arterial steal syndrome, where blood is diverted away from the distal extremity. These symptoms are indicative of venous insufficiency and require prompt evaluation to prevent ischemic damage. Choice C reason: Pain proximal to the fistula site may be due to muscular strain or vascular congestion, but it is not a hallmark of venous insufficiency. Venous insufficiency typically affects areas distal to the compromised vessel. Choice D reason: Foul-smelling drainage is more indicative of infection rather than venous insufficiency. While infection is a serious complication of fistulas, it does not reflect impaired venous return or circulation.