Reduced Thrombin Generation and Soluble P-selectin After Intravenous Enoxaparin During PCI

The objective of our study was to identify changes in the coagulation and serum concentration of soluble P-selectin (sP-sel) after i.v. bolus of 0.75 mg/kg enoxaparin in a group of 33 patients during PCI. As compared to baseline, i.v. enoxaparin increased anti -Xa activity and FIIa inhibition together with APTT and thrombin time tests within 20 min, that persisted for 60 min. At 6 h, the results of all tests had returned to baseline. In contrast, the level of prothrombin fragments (F1 + 2) decreased persistingly for a period of 6 h (baseline 1.19 +/- 0.42 nmol/l, after 20 min 1.03 +/- 0.46 nmol/l, after 60 min 1.06 +/- 0.43 nmol/l, after 6 h 0.95 +/- 0.40 nmol/l, p < 0.001 vs. baseline for all values). In addition, i.v. enoxaparin decreased serum sP-sel level (baseline 111.80 +/- 37.05 ng/ml, after 20 min 87.80 +/- 33.17 ng/ml, after 60 min 86.45 +/- 29.15 ng/ml, after 6 h 92.24 +/- 31.34 ng/ml, p < 0.001 vs. baseline value for all). sP-sel level mildly correlated with both F Xa inhibition (r = -0.275, p < 0.05) and F1 + 2 level (r = 0.274, p < 0.05). Intravenous enoxaparin induced target F Xa inhibition (> 0.6 IU/ml) for 60 min in 82% of study patients. During the 6 h of monitoring, a decrease of thrombin generation (F1 + 2) and sP-selectin levels were observed.