A client's infusion of NS infiltrated earlier today, and approximately 500 ml of saline infused into the subQ tissue. The client is now complaining of excruciating arm pain and demanding stronger pain medications. What initial action is most important for the nurse to take?
a) Administer the requested stronger pain medication to alleviate the pain.
b) Notify the healthcare provider immediately.
c) Assess the client's pain using a pain scale.
d) Apply a warm compress to the infiltrated area.