Group L were injected Lmwh subcutaneously ( 3200 U/d ) at preoperative , after operation 1 , 2 and 3 d. Blood samples were taken before operation ( T ( 0 ) ) , at the end of surgery ( T ( 1 ) ) , 1 d ( T ( 2 ) ) , 2 d ( T ( 3 ) ) and 3 d ( T ( 4 ) ) after operation for determination the values of R , K , angle , MA and CI , using thromboelastography , and the DVT were also examined through color Doppler ultrasonography at 3 d after operation .
