title: [Alterations in coagulation in patients during transplant conditioning regimen before allogeneic hematopoietic stem cell transplantation].
abstract: OBJECTIVE
  To evaluate the alterations in coagulation in patients during conditioning with modified busulfan plus cyclophosphamide (BU/CY) +/- antithymocyte globulin (ATG) regimen before allogeneic hematopoietic stem cell transplantation (allo-HSCT), and to assess the effect of ATG on coagulation system.
  
  
  METHODS
  Thirty-five patients with various hematological malignancies undergoing allo-HSCT were assessed. Of them, 19 patients with HLA-matched sibling donors (group A) were conditioned with modified BU/CY regimen, 16 with HLA-mismatched family members or HLA-matched unrelated donors (group B) were conditioned with modified BU/CY + ATG regimen. Blood samples were collected before the beginning of conditioning till d + 1 after allo-HSCT. The following parameters were measured: prothrombin time (PT), activated partial thromboplastin time (APTT), fibrinogen (Fg), antithrombin (AT), D-Dimer, fibrin degradation product (FDP), platelet (BPC), liver enzymes and bilirubin. FVIII: C, FIX: C, FXI: C and FXII: C in prolonged APTT blood samples were also determined. Clinical hemorrhagic symptoms were monitored.
  
  
  RESULTS
  During conditioning, temporary lengthening of APTT, persistent rising in Fg and declining of BPC were observed in the two groups. Alterations of Fg and BPC were more significant in group B than in group A. Transient D-Dimer increase occurred only in group B on administration of ATG. Among intrinsic pathway coagulation factors, FXII: C and FXI: C were commonly decreased while APTT prolonged. No difference between the two groups was found with regard to PT, FDP, AT and liver parameters which remained in normal ranges. Most of patients in the two groups did not have overt bleeding manifestations.
  
  
  CONCLUSIONS
  Modified BU/CY +/- ATG conditioning regimen can induce subclinical alterations in coagulation. The regimen containing ATG has more significant effect on coagulation parameters.
authors.affiliation: Institute of Hematology, Peking University, People's Hospital, Beijing 100044, China.
authors.forename: Qian
authors.initials: Q
authors.lastname: Jiang
authors.forename: Xiao-jun
authors.initials: XJ
authors.lastname: Huang
authors.forename: Kai-yan
authors.initials: KY
authors.lastname: Liu
authors.forename: Huan
authors.initials: H
authors.lastname: Chen
authors.forename: Yu-hong
authors.initials: YH
authors.lastname: Chen
authors.forename: Zhi-yong
authors.initials: ZY
authors.lastname: Gao
authors.forename: Dao-pei
authors.initials: DP
authors.lastname: Lu
mesh_terms: D000293:Adolescent; D000328:Adult; D000961:Antilymphocyte Serum / Q000627:therapeutic use; D001777:Blood Coagulation / Q000187:drug effects*; D002648:Child; D003520:Cyclophosphamide / Q000627:therapeutic use; D005260:Female; D019337:Hematologic Neoplasms / Q000503:physiopathology* / Q000601:surgery; D018380:Hematopoietic Stem Cell Transplantation; D006801:Humans; D008297:Male; D008875:Middle Aged; D010314:Partial Thromboplastin Time; D011517:Prothrombin Time; D019172:Transplantation Conditioning; D055815:Young Adult
chemical_list: D000961:Antilymphocyte Serum; D003520:Cyclophosphamide