Preoperative hyponatremia and perioperative complications

Area of Science:

• Perioperative Medicine
• Clinical Chemistry
• Surgical Outcomes Research

Background:

• Hyponatremia (low sodium levels) is linked to adverse health outcomes but its impact on surgical patients is unclear.
• Understanding perioperative risks associated with hyponatremia is crucial for patient safety.

Purpose of the Study:

• To investigate if preoperative hyponatremia predicts 30-day morbidity and mortality after major surgery.
• To identify specific perioperative complications associated with low sodium levels.

Main Methods:

• A large cohort study analyzed data from 964,263 adult patients undergoing major surgery.
• The American College of Surgeons National Surgical Quality Improvement Program database was used (2005-2010).
• Multivariable logistic and quantile regression models assessed risks for mortality, major adverse events, and hospital stay length.

Main Results:

• Preoperative hyponatremia (sodium <135 mEq/L) was associated with increased 30-day mortality (5.2% vs 1.3%).
• Hyponatremia increased risks for major coronary events, wound infections, and pneumonia.
• The association was stronger in non-emergency surgeries and healthier patients (ASA class 1-2).

Conclusions:

• Preoperative hyponatremia is a significant prognostic marker for 30-day perioperative morbidity and mortality.
• Identifying and potentially correcting hyponatremia before surgery may improve patient outcomes.