• Ductopenia is mainly caused by chronic rejection, where the immune system attacks the bile ducts. Ischemic cholangiopathy, on the other hand, comes from poor blood flow, like when the hepatic artery is blocked.

• Research shows ischemic cholangiopathy can lead to ductopenia by causing bile duct damage that results in their loss, but ductopenia can also happen from rejection, not just ischemia.

• The evidence leans toward both conditions causing cholestasis and potentially needing retransplantation, but they differ in primary causes and diagnosis methods.