When replacing sodium, what neurologic activity should you monitor for?

• A. Dizziness
• B. Rash
• C. Seizures
• D. Nausea

Answer: (C)

Raising or correcting sodium changes the serum osmolality, which directly affects brain cells. If the correction happens too quickly, neurons can become irritable or injured, leading to seizure activity. That neurologic sign is the most urgent indicator that the sodium replacement is causing an unsafe shift, so you’d reassess the rate and amount of fluid or electrolyte given and adjust promptly to prevent brain injury. While dizziness, nausea, or a rash can occur during therapy, they are not as specific or critical for detecting dangerous CNS effects as seizures are. Monitoring for new or worsening seizures helps ensure the correction remains within safe limits and the patient’s brain is protected.