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The deposition of blood cells on canine jugular veins induced by intestinal anastomosis followed by a 4 hour post-operative interval or 4 hour intravenous infusion of vasoactive substances was studied by scanning and transmission electron microscopy (SEM, TEM). The vasoactive compounds infused were serotonin (200 ug/min), histamine (150 ug/min), or bradykinin (6 ug/min). Control dogs were infused with Tyrode’s solution alone. Three dogs were used in each group. At the end of the experimental period 90% of blood was removed by total body perfusion. Immediately after asystole the vessels were partially fixed in situ then removed for further processing. The pattern of cellular deposition varied with the experimental group. Control dogs exhibited the least response with only sparse deposition of individual leukocytes and erythrocytes. Anastomosis dogs exhibited the greatest response with extensive deposition of erythrocytes and leukocytes both a-lone and in association with fibrous material. The response of serotonin infused dogs was limited to deposition of patches of leukocytes with occasional erythrocytes. Both histamine and bradykinin infused dogs exhibited a sparse to moderate deposition of leukocytes and erythrocytes on most of the luminal surface. In addition, these animals also had extensive focal deposition of leukocytes and erythrocytes around valves and inflow areas of feeder vessels. The results suggest: (1) extensive deposition of thrombotic material can occur in the early post-operative period, (2) agents known to alter endothelial permeability can induce moderate general and extensive focal cellular deposition, and (3) the extensive focal deposition induced by histamine and bradykinin infusion was limited to stress areas.

Patterns of Deposition of Blood Cells on the Luminal Surface of Jugular Veins Induced by Surgery or Infusion of Vasoactive Substances