Abstract
Summary and conclusions. Various segments of the portal circulation (including the portal vein) have been suddenly occluded by ligature in 7 adult Macacus rhesus monkeys. All of the animals have survived this procedure uneventfully and are in apparent good health from 16 to 51 days postoperatively. By means of portal venography anastomotic channels have been demonstratd by way of which blood is immediately returned to the systemic circulation in sufficient quantities to prevent these animals from succumbing to shock due to depletion of their circulating blood volume.
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