F2 and Hyponatremia: PDH was defined as a serum sodium level below 137 mmol/L, occurring on the third postoperative day (POD) or later.<h4>Results</h4>Hyponatremia on POD 1-2 (OR = 2.64, P = 0.033), prothrombin time (PT) (OR = 1.78, P = 0.008), and percentage of monocytes (OR = 1.22, P = 0.047) were identified as predictive factors for PDH via multivariable logistic regression analysis.