Compared with that in the citrate group , both PT and APTT in heparin group was significantly higher -LSB- PT : ( @ @ ) s vs ( @ @ ) s , P < @ ; APTT : ( @ @ ) s vs ( @ @ ) s , P < @ ; respectively -RSB- at @ h during SLED.However , the PT and APTT levels in heparin group decreased afterwards and were similar with those in the citrate groups at @ h during treatment .