Abstract
Twenty-four arteries of rabbit ears, divided into two groups of 12 vessels each, were prepared and 32P-labelled platelets were infused. Arteriotomy/intimectomy was performed after 1 hr and in vivo platelet accumulation recorded for 2 hr. Group A comprised untreated control animals and group B was treated with 1 g hydroxyethyl starch (HES), MW 450,000 in 17 ml saline/kg b.w. (Plasma-steril). Vessel bleeding-times were normal, patency was improved, and intraluminal thrombotic material was reduced after HES treatment. Initial in vivo platelet accumulation was rapid and reached similar levels in both groups. However, the platelet accumulation curves decreased more frequently following HES than in the control group. HES does not prevent platelet accumulation at trauma sites, but reduces the sizes of the thrombi formed and may enhance disaggregation/fibrinolysis.
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