Continuous recording of splenic diameter, vein flow, and hematocrit in intact dogs

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Abstract
One week after surgical implantation, splenic diameter, splenic vein flow, splenic vein hematocrit, and arterial hematocrit were recorded continuously under the effects of epinephrine fright, and hemorrhage. With epinephrine, the spleen promptly contracted, followed by an increase in splenic vein hematocrit and flow and, approximately 15 sec. later, a sustained increase in systemic hematocrit from 45 to 50%. The increase in splenic vein hematocrit and flow were brief (2.5 and 5 min), whereas the systemic hematocrit and splenic diameter returned to basal levels in 11 and 13 min. During recovery, the splenic vein hematocrit showed no hemodilution, indicating that the extra plasma was removed via the lymph. Fright produced similar results in the awake animal. Hemorrhage caused an initial increase in systemic hematocrit due to splenic contraction. Pentobarbital consistently caused transient splenic contraction with release of high-hematocrit blood.

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