title: [Impact of heparin on coagulation index during the  therapy of molecular adsorbent recirculating system  in patients with liver failure].
abstract: OBJECTIVE
  To investigate the impact of coagulative parameters on different anticoagulation systems in molecular adsorbent recirculating system (MARS) in subjects with liver failure, and to evaluate the safety of different anticoagulation methods .
  
  
  METHODS
  A prospective experimental observation was designed. According to anticoagulation Methods , 174 MARS treatment sessions for 146 patients with liver failure and prothrombin time activity percentage (PTA) ≤ 40% were randomly divided into 2 groups: 92 MARS treatment sessions in the heparin-free group and 82 in the low-dose heparin group. Time points of 0, 0.5, 1, 2, 3, 4, 5 and 6 h were selected to observe the coagulation changes of prothrombin time (PT), PTA, thrombin time (TT), activated partial thromboplastin time (APTT) and international normalized ratio (INR) dynamically. Adverse events such as line / filter coagulation, rupture and bleeding were also investigated and compared due to frequency and severity between the 2 groups.
  
  
  RESULTS
  There was no difference in PT, PTA, INR between the 2 groups, but significant differences were observed in APTT and TT and fibrinogen (Fbg). APTT and TT levels in the low-dose heparin group was increased rapidly after the first given dose of anticoagulant heparin and reached the peak within 30 min.The levels at each time point was statistically different between the 2 groups (P<0.05). A significant difference in the Fbg level was obtained between the 2 groups. In the low-dose heparin group it was stabilized and increased slightly at the end of the treatment. While in the heparin-free group it was decreased gradually and reached a ravine at the end of the treatment. A curve was observed after 2.5 h treatment between the 2 groups (P=0.001). There were 2 cases of severe bleeding after MARS was finished in the heparin group, and 1 was terminated because of degree III clotting in the heparin-free group.
  
  
  CONCLUSIONS
  Fibrinogen should be adsorbed while the blood touches the MARS circuit path and anticoagulants can prevent it. Comprehensive analysis of blood platelet count (BPC), fibrin degradation products (FDP), D-dimer and clinical symptoms is critical and required to determine the coagulation status to select an anticoagulation system before MARS. The use of low dose heparin in MARS improves the disorder of hypercoagulable state during the high coaguation period, while heparin-free during low coagulation period can effectively prevent the occurrence of bleeding and improve the mechanism of blood coagulation by reducing heparin-like substance in the blood.
authors.affiliation: Department of Infectious Disease, Xiangya Hospital,  Central South University, Changsha 410008, China.
authors.forename: Su'e
authors.initials: S
authors.lastname: Yuan
authors.forename: Yang
authors.initials: Y
authors.lastname: Zhou
authors.forename: Deming
authors.initials: D
authors.lastname: Tan
authors.forename: Dan
authors.initials: D
authors.lastname: Li
authors.forename: Tao
authors.initials: T
authors.lastname: Zhou
authors.forename: Qunying
authors.initials: Q
authors.lastname: Xie
authors.forename: Juan
authors.initials: J
authors.lastname: Fan
mesh_terms: D000293:Adolescent; D000327:Adsorption; D000328:Adult; D000925:Anticoagulants / Q000008:administration & dosage*; D004211:Disseminated Intravascular Coagulation / Q000517:prevention & control; D005260:Female; D006493:Heparin / Q000008:administration & dosage*; D006801:Humans; D017093:Liver Failure / Q000628:therapy*; D019164:Liver, Artificial; D008297:Male; D008875:Middle Aged; D011517:Prothrombin Time; D016060:Sorption Detoxification / Q000379:methods*; D055815:Young Adult
chemical_list: D000925:Anticoagulants; D006493:Heparin