Survival and incidence of hemorrhage and encephalopathy were studied in 121 medically managed cirrhotic patients according to the type of naturally occurring portasystemic shunting. Three types of shunting were distinguishable using scintillation splenoportography, a method whereby morphological and hemodynamic data on portal and hepatic circulation were obtained by external detection. The three patterns were: (1) extrahepatic shunting with partial splenic blood flow diversion, (2) spontaneous total splenic blood flow diversion, and (3) intrahepatic shunting corresponding to portohepatic communications with a diameter larger than 10 mum. The probability of 4-year survival was much lower in case of portasystemic shunting (18%) than in its absence (73%, P less than 0.01). Patients with intrahepatic shunting had a survival rate not significantly different from that of patients with extrahepatic shunting. However, they had the highest incidence of hemorrhage (71%), and hemorrhage was not due to rupture of esophageal varices. The highest incidence of encephalopathy was seen in patients with total splenic blood diversion (40%), but it was not significantly different from that of other cirrhotic patients. No group of patients can be significantly identified as a high-risk group.
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