Fluid Restriction Reduces Delayed Hyponatremia and Hospital Readmissions After Transsphenoidal Surgery.

Area of Science:

• Endocrinology
• Neurosurgery
• Hospital Medicine

Background:

• Postoperative hyponatremia is a common complication following transsphenoidal surgery.
• Hyponatremia increases hospital length of stay and 30-day readmission rates.
• Effective strategies are needed to mitigate these adverse outcomes.

Purpose of the Study:

• To evaluate three distinct strategies for reducing postoperative hyponatremia rates.
• To identify risk factors associated with hyponatremia and subsequent readmissions.
• To analyze the impact of interventions on patient outcomes and healthcare costs.

Main Methods:

• A mixed-methods approach involving two retrospective analyses and one prospective study.
• Interventions included standardized patient education, postoperative day 7 sodium testing, and fluid restriction (1 L/day on discharge).
• Patient populations included those undergoing transsphenoidal surgery for pituitary adenomas and related sellar pathologies.

Main Results:

• Phase 3 (fluid restriction plus education/testing) demonstrated a 2-fold reduction in delayed hyponatremia (12.7%) and a 3-fold reduction in readmissions (4.6%).
• Patient education and sodium testing reduced hyponatremia severity by 60% but did not affect readmission rates.
• Hyponatremia-related readmissions increased healthcare costs by 30%.

Conclusions:

• Fluid restriction to 1 L/day upon discharge is a highly effective strategy for decreasing delayed hyponatremia and readmissions by approximately 50%.
• Standardized patient education and postoperative day 7 sodium testing effectively reduce hyponatremia severity.
• These protocols, particularly fluid restriction, should be integrated into standard care for patients undergoing transsphenoidal surgery.