A nurse is preparing to administer lidocaine via continuous IV infusion at 4 mg/min. Available is lidocaine 2 g dextrose 5% in water 500 mL. The nurse should set the IV pump to deliver how many mL/hr?
(Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)

Choice A Reason:
Hypomagnesemia is incorrect. Lithium therapy itself is not a direct cause of hypomagnesemia. While exercise can affect magnesium levels to some extent, it's not a primary electrolyte imbalance that is typically associated with lithium use or considered a significant concern specifically due to lithium.
Choice B Reason:
Hypocalcemia is incorrect. Similarly, lithium therapy is not a direct cause of hypocalcemia. Exercise can affect calcium metabolism, but it's not a primary electrolyte imbalance typically associated with lithium use or considered a significant concern specifically due to lithium.
When a client taking lithium begins a new exercise program, the nurse should primarily assess for the risk of:
Choice C Reason:
Hyponatremia is correct. Lithium can affect the body's regulation of sodium, and excessive sweating due to increased exercise can lead to sodium loss. This combination can potentially contribute to the development of hyponatremia (low sodium levels). Therefore, when a client on lithium starts a new exercise regimen that may induce sweating, monitoring for signs of hyponatremia becomes crucial. Symptoms of hyponatremia can include confusion, headaches, nausea, and in severe cases, seizures or coma.
Choice D Reason:
Hypokalemia is incorrect. Lithium itself does not commonly cause hypokalemia. Exercise can lead to potassium loss through sweating, but hypokalemia is not the primary electrolyte imbalance typically associated with lithium use or considered a significant concern specifically due to lithium.

Choice A Reason:
Levothyroxine 100 mcg PO every morning is incorrect. Indicates the dosage (100 mcg) and the route (by mouth) to be taken every morning.
Choice B Reason:
Simvastatin 40 mg PO at bedtime: Specifies the dosage (40 mg) and the timing (at bedtime) for administration.
Choice C Reason:
Acetaminophen 500 mg every 4 hr RN for fever is correct. The term "RN" in this context might be interpreted as "right now" rather than the intended meaning, which could cause confusion regarding the frequency of acetaminophen administration. The nurse should seek clarification to ensure accurate and safe dosing instructions.
Choice D Reason:
Morphine 4 mg IV every 4 hr PRN for pain: Specifies the dosage (4 mg), the route (intravenous), and the frequency (every 4 hours as needed) for pain management.