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Since it is still not entirely clear just how this portal obstruction is produced we will summarize the chief working hypotheses and the plans of treatment that arise from them. Normal Circulation of the Liver. The blood enters the liver from two sources: 60 per cent via the portal vein at a pressure approximating 1 cm. mercury; 40 per cent via the hepatic artery at a pressure of 10 to 13 cm. mercury.33 There is one exit only, the hepatic vein. The small volume, highpressure hepatic arterial flow and the large volume low-pressure portal flow meet chiefly through the confluence of their terminals within the intralobular sinusoids that bathe the liver cells.16 The sinusoids empty this combined circulation into the central veins of the lobules, and these in turn collect

The Management of Bleeding Esophageal Varices Associated With Cirrhosis of the Liver*