Portal vein diameter, pressure, and flow during hemorrhagic shock.

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Abstract
Flow in the abdominal aorta and portal vein were monitored with ultrasonic flowmeters in dogs; the diameter of the portal vein was monitored with a pair of miniature mutual inductance coils and the pressure through a silastic catheter. Hemorrhage was carried to a mean pressure of 50-60 mm Hg and maintained at the level by repeated small hemorrhages until death. During initial hemorrhage, the portal vein diameter decreased, and in one-third, the portal vein pressure increased, indicating active constriction. In the later stages of shock, pooling, defined as an increase in portal vein diameter associated with a decrease in portal vein pressure, was seen in 14 of 21 animals. Terminally, there was usually an agonal contraction of portal vein diameter associated with a transient increase in portal vein pressure.

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