A nurse is monitoring a client's peripheral IV infusion of a vesicant medication and observes swelling and coolness of the skin at the insertion site. After stopping the infusion, which of the following actions should the nurse take next?

The correct answer is D: Remove the IV catheter. Swelling and coolness at the insertion site indicate extravasation, which is the leakage of vesicant medication into the surrounding tissue, causing potential tissue damage. Removing the IV catheter immediately helps prevent further infiltration and tissue injury. Notifying the provider (A) can be done after removing the catheter. Applying warm compress (B) is incorrect as it can increase the absorption of the vesicant and worsen tissue damage. Aspirating fluid (C) may not be effective in removing the medication from the tissue.