Why the study?
Are circulating levels of haemostatic and adhesion factors (P-selectin, VCAM-1, tissue factor) elevated by the presence of deep vein thrombosis but not by surgery?
Are circulating levels of haemostatic and adhesion factors (P-selectin, VCAM-1, tissue factor) elevated by the presence of deep vein thrombosis but not by surgery?
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Assay of VCAM-1, P-selectin, and tissue factor may be useful in the early detection of venous thrombi in postoperative patients, as their levels are elevated by thrombus but not by surgery.
Current biochemical markers of thrombosis, such as d-dimer, are of little value in demonstrating the presence of thrombus postoperatively, as their levels are elevated by surgery. Thrombosis involves adhesive interactions between the endothelium, platelets and leukocytes. The aim of the study was to determine which of a panel of haemostatic and adhesion factors are altered by the presence of thrombus, but not by surgery. These factors were measured in 20 patients with established spontaneous DVTs, 13 patients having hip replacement surgery and 28 control patients. Circulating levels of P-selectin, VCAM-1 and tissue factor were found to be increased when thrombus was present (p <0.018, p <0.0001, p <0.0028 respectively), but were not altered by surgery. The significance of these circulating factors in venous thrombosis remains to be established, but it is conceivable that they are the product of increased leukocyte trafficking and activity. Assay of VCAM-1, in particular, may be of use in the early detection of venous thrombi in postoperative patients.
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Quarmby et al. (1999) studied this question.
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