The nurse has just received change-of-shift report about these four patients. Which patient should the nurse assess first?

A 51-year-old who has just returned to the unit after a coronary arteriogram and PCI.

A 60-year-old who has a scheduled dose of atenolol (Tenormin) 25 mg PO due.

A 38-year-old who has pericarditis and is complaining of sharp, stabbing chest pain.

A 45-year-old who had an MI 4 days ago and is anxious about the planned discharge.