Fig. 1

Treatment and laboratory data by postoperative day (POD). a Treatments by time. When CDI was predominant, vasopressin was titrated. When CSW was predominant, sodium supplementation was prioritized. For fluid losses from both diagnoses, on most days, 0.9% NaCl was the chosen replacement. The period of nephrogenic diabetes insipidus was treated with reduction in fluid replacement and enteral protein supplement. b Select examples of diagnostic laboratory results and the predominant diagnosis that guided treatment at that time. CDI Central diabetes insipidus, CSW Cerebral salt wasting, DDAVP Subcutaneous desmopressin, Dx Diagnosis, Fluid balance Documented fluid balance over a 24-hour period, LR Lactated Ringer solution, SIADH Syndrome of inappropriate antidiuretic hormone, SNa Serum sodium concentration, SOsm Serum osmolality, UNa Urine sodium concentration, UOP Urine output, UOsm Urine osmolality