The "white clot syndrome" in hepatic transplantation.

Heparin-associated thrombocytopenia and thrombosis (Type II HAT), the "white clot syndrome," has not been previously reported as a cause for fulminant hepatic failure after liver transplantation. Thrombocytopenia and the use of heparin are common events in the newly transplanted patient. A man who was transplanted for sclerosing cholangitis, and re-exposed to heparin, is described with thrombocytopenia, thrombosis of all hepatic vessels, and heparin antibodies. Type II HAT is an immune phenomenon that can apparently occur despite T-cell-directed immunosuppression. Suspicion is a key element in establishing diagnosis. We no longer use heparin routinely in liver transplant cases.