Abstract
Dogs were subjected to acute exsanguination during which their blood was tested for adhesive or aggregated blood elements by passing the blood through a microfilter with multiple precise pores 20 µ sq. During the latter half of exsanguination the leukocytes and platelets became progressively more adhesive, but significant aggregation was not observed. This was attended by a rapid fall in mean blood pressure. Treating blood containing adhesive platelets and leukocytes with Pyrex glass wool removed significant numbers of these adhesive elements from the blood.