The nurse notes redness and tenderness at the patient's IV insertion site. What should the nurse do next?

Phlebitis is inflammation of a vein characterized by erythema, tenderness, warmth, and possible cordlike induration at the insertion site. It results from mechanical irritation, chemical infusion, or infection. Immediate catheter removal prevents thrombosis and systemic complications. Rationale: A. Applying a warm compress may reduce discomfort after catheter removal but does not address the underlying cause. Continuing infusion through an inflamed vein worsens vascular injury and increases infection risk. The presence of redness and tenderness necessitates discontinuation first. B. Flushing the IV line assesses patency but is contraindicated when phlebitis is suspected. Forcing fluid through an inflamed vein can exacerbate endothelial damage and increase risk of infiltration or thrombosis. Pain and erythema indicate the line should not be used. C. Removal of the IV catheter is the priority intervention when signs of phlebitis are present. This prevents progression to thrombophlebitis and systemic infection. Establishing a new site maintains therapy while eliminating the source of inflammation and vascular compromise. D. Documentation and monitoring alone are insufficient because phlebitis can progress rapidly if the catheter remains in place. Delayed intervention increases risk of complications such as thrombosis or infection. Active signs like tenderness and redness require immediate action.