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

Rationale: A. Infection is incorrect because infection usually presents with redness, warmth, tenderness, and sometimes purulent drainage at the IV site. Swelling and coolness are not typical early signs of infection. B. Infiltration is correct because infiltration occurs when IV fluid leaks into the surrounding tissue instead of the vein. Classic signs include swelling, coolness, pallor, and slowed or stopped infusion. Pain or discomfort may also be present. Early recognition is important to prevent tissue damage and complications, and the primary action is to stop the IV, remove the catheter, elevate the limb, and apply warm or cold compresses as indicated. C. Phlebitis is incorrect because phlebitis is vein inflammation, presenting with redness, warmth, pain along the vein, and a hard, cord-like vein. The site is usually warm, not cool. D. Thrombosis is incorrect because thrombosis involves clot formation in the vein, often presenting with swelling, pain, and sometimes redness, but the site may not feel cool. Infusion may be slowed, but the coolness at the site is more characteristic of infiltration.