Final answer:
The nurse should plan to initiate continuous cardiac monitoring due to the client's high magnesium level.
Step-by-step explanation:
The nurse should plan to initiate continuous cardiac monitoring.
A magnesium level of 2.7 mEq/L is considered high, which can lead to cardiac arrhythmias and other complications. Continuous cardiac monitoring is necessary to monitor the client's heart rhythm and detect any abnormalities.
Administering potassium chloride PO with orange juice (option 2) is not appropriate as it does not address the high magnesium level.
A diet rich in legumes, nuts, and green vegetables (option 3) may be beneficial for overall health, but it does not directly address the high magnesium level.
Monitoring for tetany (option 4) is also not relevant to the high magnesium level.