Metabolic improvements in intrahepatic porto-systemic venous shunt presenting various metabolic abnormalities by 4-phenylacetate

Hironori Nagasaka, Takashi Miida, Tohru Yorifuji, Ken Ichi Hirano, Ayano Inui, Tomoo Fujisawa, Hirokazu Tsukahara, Hisamitsu Hayashi, Yukihiro Inomata

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


Background: Intrahepatic congenital portosystemic venous shunt (CPSVS) presents hyperammonemia, cholestasis, hypergalactosemia and imbalanced vasomediators. Especially, fluctuating plasma ammonia often causing neurological signs and symptoms is a serious problem in the daily life. 4-Phenylacetate (4-PA) has effects to eliminate blood ammonia, bile acids and bilirubin. 4-PA might be expected to improve the metabolic abnormalities in intrahepatic CPSVS. Methods: Three intrahepatic CPSVS children often receiving 4-PA from early life were enrolled. We analyzed biological and clinical changes by intravenous administration of 4-PA. Results: 4-PA improved hyperammonemia enough to subside the clinical presentations: headache, cognition dysfunction and attention deficit. Concurrently, this drug decreased serum total bilirubin and total bile acid levels. In their neonatal ages, 4-PA also decreased galactose and galactose-1-phosphate levels. In their preschool or school ages, 4-PA increased nitric oxide (NO) prompting vasodilation, but not changed amino acids controlling NO production and endothelin-1 prompting vasoconstriction. Plasma ammonia level returned to the pre-administration level within one day of the discontinuation, and serum total bilirubin and total bile acid levels were maintained to be reduced a few days after the discontinuation. Conclusion: 4-PA improves galactosemia and imbalanced vasomediators, together with liver functions, in CPSVS, although such effects retract after the discontinuation.

Original languageEnglish
Pages (from-to)52-56
Number of pages5
JournalClinica Chimica Acta
Publication statusPublished - Apr 8 2013


  • 4-Phenylacetate
  • Cholestasis
  • Galactosemia
  • Hyperammonemia
  • Nitric oxide
  • Portosystemic venous shunt

ASJC Scopus subject areas

  • Biochemistry
  • Clinical Biochemistry
  • Biochemistry, medical


Dive into the research topics of 'Metabolic improvements in intrahepatic porto-systemic venous shunt presenting various metabolic abnormalities by 4-phenylacetate'. Together they form a unique fingerprint.

Cite this