A patient receiving intravenous chemotherapy begins to complain of intense pain and swelling at the IV site. Upon assessment, the nurse notes redness and warmth in the area. What is the most appropriate initial nursing intervention?

Stop the infusion, notify the healthcare provider, and assess the site for further complications.

Administer an antiemetic and continue monitoring the patient.

Continue the infusion and apply warm compresses to the site.

Immediately aspirate the IV site without stopping the infusion.