What is the Kasai portoenterostomy, and what determines its success?

The Kasai portoenterostomy excises the fibrous biliary remnant at the porta hepatis and constructs a Roux-en-Y portoenterostomy, so bile drains through tiny residual ductules. Success depends most on early surgery (ideally before ~3 months), the type of atresia, surgical expertise, and pre-existing liver damage; overall success is about 60%, and it is a bridge to transplant.

Clinical relevance. Knowing that the Kasai's success hinges on early timing reinforces the urgency of diagnosing biliary atresia.

More Detail

Kasai portoenterostomy

The Kasai procedure is the first-line surgical treatment for biliary atresia, aiming to restore bile drainage.

The procedure

• The fibrous biliary remnant is dissected off the porta hepatis (between the hepatic arteries and portal vein branches).
• A Roux-en-Y portoenterostomy is constructed, so bile drains through tiny residual hepatic ductules at the porta.

Factors determining success

• Timing: best done early (before about 3 months of age).
• Type/nature of the atresia; surgical expertise; pre-existing liver damage; immediate post-operative care.
• Success judged by clearance of jaundice, normalising bilirubin/LFTs, good stool colour and weight gain.

Outcome

• Overall success about 60% even with timely surgery; a successful Kasai = native liver survival over 2 years.
• The disease is progressive - Kasai is a bridge to liver transplantation.