Hemostatic markers in Japanese patients undergoing anticoagulant therapy under thrombo-test monitoring

The objective of this study was to evaluate several molecular markers of he mostasis in 84 patients with hypercoagulable state, treated with warfarin u nder thrombo-test (TT) monitoring; TT was expressed as percent of control ( TT%). In all patients, the average values of international normalized ratio (INR) of prothrombin time (PT;PT-INR) was 1.68 +/- 0.49; this increase in PT-INR was not, however, significant in patients under TT% monitoring. Ther e were no thrombotic or severe bleeding complications in these patients dur ing a period of 2 years. Plasma levels of thrombin-antithrombin complex (TA T), plasmin-plasmin inhibitor complex (PPIC), D-dimer, and soluble fibrin m onomer (sFM) were slightly increased, suggesting that anticoagulant therapy was not completely effective in our Japanese patients based on the values of TT%. Activated partial thromboplastin time, PT-INR, TT% and protein C ac tivity were significantly correlated with the dose of warfarin; fibrinogen, activated thromboplastin, TAT, PPIC, D-dimer, sFM, protein S and thrombomo dulin were not significantly correlated with the dose of warfarin. The PT-I NR was negatively correlated with TT%, protein C and protein S, and the cor relation between PT-INR and TT-INR was better than that between PT-INR and TT%. The range of TT% was not correlated with the plasma levels of TAT, PPI C, D-dimer or sFM, but the range of PT-INR was correlated with the plasma l evel of TAT, D-dimer and sFM. The percentage of TAT, D-dimer and sFM within normal range was significantly low in patients with high PT-INR. These fin ding showed that PT-INR is better than TT% for monitoring the anticoagulant therapy with warfarin, and that TT should be expressed as INR. The values of PT-INR should be more than 1.7 during the anticoagulant therapy with war farin in Japanese patients with high risk of thrombosis. (C) 1999 Lippincot t Williams & Wilkins.