The LVN notes swelling and coolness at the IV site with slowed infusion. This finding is most consistent with:

Rationale: A. Infiltration is correct. Infiltration occurs when IV fluid leaks into the surrounding tissue instead of remaining in the vein. Classic signs include swelling (edema), cool skin at the site, and slowed or stopped infusion due to increased tissue pressure. The affected area may also appear pale and feel firm or taut. Infiltration is commonly caused by catheter dislodgement or fragile veins. Prompt identification allows the nurse to discontinue the IV, elevate the extremity, and apply appropriate compresses to reduce discomfort and prevent further tissue injury. B. Thrombosis involves a blood clot within the vein, which may present as redness, tenderness, or a palpable cord, but coolness is not typical, and swelling is often localized along the vein rather than the surrounding tissue. Slowed infusion can occur but the site characteristics differ from infiltration. C. Infection at the IV site typically presents with redness, warmth, pain, and sometimes purulent drainage. Coolness at the site is not consistent with infection, making this less likely in this scenario. D. Phlebitis is inflammation of the vein, usually characterized by redness, warmth, pain, and a hard, cord-like vein. Swelling may occur, but the skin is usually warm rather than cool, distinguishing it from infiltration.