Platelet response to vascular surgery--a preliminary study on the effect of aspirin and heparin.

Patients with peripheral arterial disease (PAD) demonstrate high cardiovascular mortality, which is further increased after arterial reconstruction. Enhanced platelet reactivity has been postulated for these patients. The effect of surgery and of periprocedural aspirin and heparin therapy on platelet reactivity was assessed with the Stagnation Point Flow Adhesio-Aggregometer (SPAA). The platelet adhesivity and aggregability of 44 PAD patients was quantitated perioperatively. Aspirin was administered during the entire course, low molecular weight heparin (LMWH) preoperatively and as of the fourth postoperative (pOP) day and unfractionated heparin (UH) upon surgery and three days thereafter. A group of 15 aspirin-free general surgical patients receiving LMWH and with no evidence of PAD served as controls. Plasma fibrinogen levels and platelet count were determined. The heparin-induced platelet activation (HIPA) assay for detection of heparin-associated thrombocytopenia (HAT) antibodies was also performed. Baseline values of SPAA-measured platelet reactivity (p < 0.001) and plasma fibrinogen (p < 0.01) were higher for patients as compared to controls and increased markedly after surgery. In the PAD group maximum platelet activation and fibrinogen levels coincided with a marked drop in platelet count and were concomitant to administration of unfractionated heparin. Thereby, a drop in platelet count of > 30% was observed in 25 patients (57%). The HIPA test verified HAT antibodies in 3 (12%) of these patients, two of which suffered postoperative thrombosis. In the control group significant pOP increases were noted only for plasma fibrinogen. Changes in platelet count and reactivity were minimal and nonsignificant. No thrombosis occurred and no HAT antibodies were detected.(ABSTRACT TRUNCATED AT 250 WORDS)