Advantages of the meso-Rex bypass compared with portosystemic shunts in the management of extrahepatic portal vein obstruction in children

Timothy B. Lautz, Lisa A. Keys, Joseph C. Melvin, Joy Ito, Riccardo A. Superina*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

76 Scopus citations


Background: Consequences of extrahepatic portal vein obstruction (EHPVO) include variceal bleeding and hypersplenism due to portal hypertension, as well as metabolic abnormalities secondary to impaired portal venous circulation. The purpose of this study was to compare the effectiveness of meso-Rex bypass and portosystemic shunt (PSS) for reversing these symptoms in children with EHPVO. Study Design: All children with idiopathic EHPVO evaluated for potential meso-Rex bypass at a single institution between 1997 and 2010 were reviewed. Portosystemic shunt was performed in patients with refractory portal hypertension when meso-Rex bypass was not technically feasible. Outcomes of meso-Rex bypass and PSS were compared, including resolution of portal hypertensive bleeding and hypersplenism, as well as changes in liver synthetic function, ammonia levels, and somatic growth. Results: Sixty-five children with EHPVO underwent successful meso-Rex bypass, while 16 required PSS. Nearly all patients experienced complete relief of variceal bleeding after meso-Rex (96%) bypass and PSS (100%). The improvements in platelet count (+82.1 ± 60.0 vs +32.4 ± 56.3 thousand/μL; p = 0.004), internal normalized ratio (-0.22 ± 0.27 vs 0.01 ± 0.14; p = 0.022), and serum ammonia level (-26.8 ± 36.8 vs +19.4 ± 33.1 μM/L; p = 0.002) were greater after meso-Rex bypass than PSS. Among patients with below average (standard deviation z-score <0) preoperative weight for age, the improvement in weight-for-age z-score was greater after meso-Rex bypass (+0.84 ± 0.98) than PSS (+0.17 ± 0.79, p = 0.044). Median duration of follow-up was 4.45 years after meso-Rex bypass and 1.8 years after PSS. Conclusions: Both meso-Rex bypass and PSS effectively relieve symptoms of portal hypertensive bleeding in children with EHPVO, although the meso-Rex better relieves hypersplenism. By restoring normal portal venous circulation, the meso-Rex bypass has additional metabolic benefits.

Original languageEnglish (US)
Pages (from-to)83-89
Number of pages7
JournalJournal of the American College of Surgeons
Issue number1
StatePublished - Jan 2013


  • DSRS
  • INR
  • IQR
  • LPV
  • PSS
  • SMV
  • distal splenorenal shunt
  • extrahepatic portal vein obstruction
  • international normalized ratio
  • interquartile range
  • left portal vein
  • portosystemic shunt
  • superior mesenteric vein

ASJC Scopus subject areas

  • Surgery


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