We analyzed the utility for a clot waveform analysis (CWA) of small
tissue factor induced FIX activation (sTF/FIXa) assay in patients with major
orthopedic surgery (including
total hip arthroplasty [THA] and
total knee arthroplasty [TKA]) receiving
edoxaban for the prevention of
venous thromboembolism (VTE). The sTF/FIXa assay using recombinant human TF in platelet-rich plasma (PRP) and platelet-poor plasma (PPP) was performed using a CWA in the above patients to monitor the efficacy of
edoxaban administration. Of 147 patients (109 THA and 38 TKA), 21 exhibited
deep vein thrombosis (DVT), and 15 had massive
bleeding. Increased peak heights of the CWA-sTF/FIX were observed in almost patients after surgery and prolonged peak heights of the CWA-sTF/FIX were observed in almost patients treated with
edoxaban. The peak heights and times of the CWA-sTF/FIX were significantly higher and shorter, respectively, in PRP than in PPP. There were no significant differences in parameters of the CWA-sTF/FIXa between the patients with and without DVT or between those with and without massive
bleeding. The peak time of CWA-sTF/FIXa were significantly longer in TKA patients than in THA patients on day 1 after surgery. The second derivative peak height of the CWA-sTF/FIXa was significantly lower in TKA patients than in THA patients on day 4. The CWA-sTF/FIX reflected
hemostatic abnormalities after surgery and the administration of
edoxaban, and the results were better in PRP than PPP. Further studies separately analyzing the THA and TKA subgroups should be conducted.