title: Ammonia tolerance in assessing the patency of portacaval anastomoses. A long-term controlled investigation.
mesh_terms: D000641:Ammonia; D005500:Follow-Up Studies; D006801:Humans; D008103:Liver Cirrhosis / Q000175:diagnosis*; D011167:Portacaval Shunt, Surgical; D013997:Time Factors
chemical_list: D000641:Ammonia