When a client's serum sodium level is 120 mEq/L, the priority nursing assessment is to monitor the status of which body system?

A. Hepatic: While liver function can influence fluid and electrolyte balance, hyponatremia primarily affects neuronal function rather than hepatic status. Hepatic assessment is not the priority in acute low sodium levels unless there is a known underlying liver disorder contributing to the imbalance. B. Neurological: The nervous system is most sensitive to changes in serum sodium because sodium regulates extracellular fluid osmolarity and neuronal excitability. Severe hyponatremia (120 mEq/L) can lead to cerebral edema, confusion, seizures, lethargy, and potentially coma, making neurological monitoring the priority for patient safety. C. Gastrointestinal: Hyponatremia can contribute to nausea, vomiting, or anorexia, but these symptoms are secondary manifestations. While GI assessment is important, it is not as urgent as monitoring for potentially life-threatening neurological complications. D. Respiratory: Sodium imbalances do not directly impair respiratory function. Respiratory assessment is important in overall patient care, but hyponatremia at this level does not typically compromise ventilation unless severe neurological impairment affects respiratory drive.