Hypophosphatemia after Hepatectomy or Pancreatectomy: Role of the Nicotinamide Phosphoribosyltransferase.

Published

Journal Article

BACKGROUND: Postoperative hypophosphatemia is common and is associated with a lower risk of liver failure after hepatectomy, but higher morbidity after pancreatectomy. Whether different physiologic mechanisms underlie the hypophosphatemia associated with these very different clinical outcomes is unclear. This study aims to evaluate the underlying mechanism in postoperative hypophosphatemia. STUDY DESIGN: We prospectively enrolled 120 patients who underwent major hepatectomy (n = 30), minor hepatectomy (n = 30), pancreatectomy (n = 30), and laparotomy without resection (control group, n = 30). Preoperative and postoperative serum and urinary phosphorus, calcium, and creatinine, as well as phosphaturic factors, including serum nicotinamide phosphoribosyltransferase (NAMPT), fibroblast growth factor-23, and parathyroid hormone were measured. In addition, we evaluated urinary levels of nicotinamide catabolites, N-methyl-2-pyridone-5-carboxamide and N-methyl-4-pyridone-3-carboxamide. RESULTS: We found that significant hypophosphatemia occurred from postoperative day (POD) 1 to POD 2 in all 4 groups and was preceded by hyperphosphaturia from preoperative day to POD 1. Phosphate level alterations were associated with a significant increase in NAMPT levels from preoperative day to POD 2 in all 3 resected groups, but not in the control group. The fibroblast growth factor-23 levels were significantly decreased postoperatively in all 4 groups, and parathyroid hormone levels did not change in any of the 4 groups. Urine levels of N-methyl-2-pyridone-5-carboxamide and N-methyl-4-pyridone-3-carboxamide decreased significantly in all 4 groups postoperatively. CONCLUSIONS: This study demonstrates that the mechanism of hypophosphatemia is the same for both liver and pancreas resections. Postoperative hypophosphatemia is associated with increased NAMPT. The mechanism that upregulates NAMPT and its role on disparate clinical outcomes in postoperative patients warrant additional investigation.

Full Text

Duke Authors

Cited Authors

  • Zheng, J; Glezerman, IG; Sadot, E; McNeil, A; Zarama, C; Gönen, M; Creasy, J; Pak, LM; Balachandran, VP; D'Angelica, MI; Allen, PJ; DeMatteo, RP; Kingham, TP; Jarnagin, WR; Jaimes, EA

Published Date

  • October 2017

Published In

Volume / Issue

  • 225 / 4

Start / End Page

  • 488 - 497.e2

PubMed ID

  • 28690207

Pubmed Central ID

  • 28690207

Electronic International Standard Serial Number (EISSN)

  • 1879-1190

Digital Object Identifier (DOI)

  • 10.1016/j.jamcollsurg.2017.06.012

Language

  • eng

Conference Location

  • United States