Perioperative coagulation assessment of patients undergoing major elective orthopedic surgery.

Traditional coagulative parameters are of limited use in identifying perioperative coagulopathy occurring in patients undergoing major elective orthopedic surgery (MEOS). The aim of our study was to evaluate the coagulation changes in patients undergoing MEOS and to facilitate an early detection of perioperative coagulopathy in patients experiencing major intraoperative bleeding. We enrolled 40 consecutive patients (M/F 10/30, age range 34-90 years) who underwent MEOS at the Orthopedic Unit of the Padua University Hospital, Italy, between January 2014 and January 2015. Blood samples were obtained at the following time points: T0-pre: 30 min before surgery; T0-post: 30 min after the end of the procedure; T1: morning of the first postoperative day; T2: 7 ± 2 days after surgery. Patients who experienced an intraoperative blood loss ≥250 mL/h were considered as cases. Routine coagulative parameters, thromboelastometry and thrombin generation (TG) profiles were evaluated. At baseline, a significantly lower platelet count and FIBTEM MCF/AUC were observed in patents with excessive bleeding (p < 0.05 and 0.02/0.01, respectively). At T0-post and T1 intervals, cases showed hypocoagulation characterized by a significantly low platelet count (p = 0.001), prolonged CFT INTEM/EXTEM, reduction of alpha-angle and MaxV INTEM/EXTEM, MCF and AUC INTEM/EXTEM/FIBTEM (p < 0.05 in all comparisons). The only TG parameter standing out between study groups was time to peak at T0-pre. A low platelet count and fibrinogen activity were associated with significant intraoperative bleeding in patients undergoing MEOS. Thromboelastometry performed by ROTEM(®) identifies patients with coagulopathy.

Whole blood coagulation assessment using rotation thrombelastogram thromboelastometry in patients with acute deep vein thrombosis.

Common tests for the assessment of blood coagulation in the acute phase of deep vein thrombosis are of limited value for the evaluation of the associated hypercoagulability. The new rotation thromboelastometry by rotation thrombelastogram has the potential to provide information on whole blood clot formation and prothrombotic state in patients with acute deep vein thrombosis. Rotation thrombelastogram parameters were evaluated in whole blood of 30 patients with a first episode of acute deep vein thrombosis and 40 healthy controls. The effect of factor VIII and fibrinogen levels on rotation thrombelastogram assays was also assessed in the study population and in a model of blood supplemented by increasing amounts of fibrinogen. All assays performed were consistent with a remarkable hypercoagulable profile in deep vein thrombosis patients as compared with controls. In particular, maximum clot firmness and the area under curve values, which are expected to better correlate with the hypercoagulable state in the acute phase of deep vein thrombosis, were significantly higher in patients than in controls. As expected, fibrinogen was shown to be one of the main determinants of the hypercoagulability in rotation thrombelastogram assays. In a small subset of acute deep vein thrombosis patients, inherited thrombophilia had no influence on rotation thrombelastogram parameters. The new rotation thrombelastogram thromboelastometry is a useful tool to detect acute deep vein thrombosis-related hypercoagulability. Prospective studies are needed to define the potential applications of rotation thrombelastogram in the management of deep vein thrombosis patients.