A nurse is caring for a client post-cardiac surgery who has developed slight hypotension and a decreased urine output. Which of the following actions should the nurse prioritize to evaluate the client's condition?

Increase the patient's IV fluid rate to prevent dehydration.

Administer a prescribed dose of diuretics to enhance urine output.

Check the patient's surgical site for signs of bleeding.

Assess the patient's pain level and administer analgesics as needed.