Which nursing action is appropriate for a client diagnosed with syndrome of inappropriate antidiuretic hormone (SIADH)?

Implementing a fluid restriction of less than 1000 mL/day is an appropriate nursing action for a client diagnosed with the syndrome of inappropriate antidiuretic hormone (SIADH). In SIADH, there is an excessive release of antidiuretic hormone (ADH), leading to water retention and dilutional hyponatremia (low sodium levels in the blood). By restricting fluid intake, the nurse helps to prevent further dilution of serum sodium and assists in correcting the imbalance. Fluid restriction is a key therapeutic intervention to manage the condition and to alleviate hyponatremic symptoms.

Other options, such as administering a fluid bolus of normal saline, could exacerbate the problem by increasing the volume of fluid and worsening hyponatremia. Encouraging high salt intake alone might not effectively improve sodium levels since the underlying issue is the excess water retention, not a deficiency in sodium. Monitoring for signs of dehydration and excessive thirst is important in general nursing care but does not directly address the critical management of SIADH, which focuses on managing fluid balance.