The Nurse Is Caring for a Client 12 Hours Status

The nurse is caring for a client 12 hours status post-myocardial infarction.There was a complete blockage to the left anterior descending coronary artery.The client's ejection fraction post-MI is 30%.It is most important for the nurse to monitor:

A) Serum blood glucose levels.
B) Nitroglycerin titration.
C) Cardiac rhythm.
D) Cardiac enzymes.