The nurse obtains verbal prescriptions from the healthcare provider for an antianginal, telemetry, and STAT serum analysis for cardiac isoenzymes, after reading back the prescriptions to the healthcare provider of a client's upper gastric burning, left jaw pain, and nausea. Which intervention is most important for the nurse to implement?

D Obtain the client's 10-point score for radiating jaw pain. A Initiate telemetry and assess the client's cardiac rhythm. B Document description of nausea and administer the antiemetic. C Submit electronic prescriptions to the pharmacy and laboratory.