title: The use of minimized extracorporeal circulation system has a beneficial effect on hemostasis--a randomized clinical study.
abstract: BACKGROUND
  Conventional cardiopulmonary bypass (CPB) is associated with increased coagulation and fibrinolytic activity. A closed miniaturized bypass circuit (CorX) features a significantly reduced tubing set, an integrated pump, and an air removal system without a cardiotomy reservoir. In a prospective randomized trial, the effects on hemostasis were investigated while comparing CorX with conventional CPB in patients undergoing coronary artery bypass grafting.
  
  
  METHODS
  Over a period of 1 year, 81 patients were randomly assigned either to the CorX system (n = 39, group A) or standard CPB system (n = 42, group B). Primary endpoints were platelet count, plasmin-antiplasmin complex (PAP), prothrombin fragments 1+2 (F1+F2), D-dimers, and fibrinogen. Secondary end-points were hematocrit, blood loss in the first 12 hours postoperatively, transfused packed red blood cells, and fresh frozen plasma in the first 24 hours postoperatively. In addition, we analyzed partial thromboplastin time, prothrombin time, and antithrombin III.
  
  
  RESULTS
  After aortic declamping, PAP complex and prothrombin F1+F2 were significantly lower in group A than in group B. The difference in D-dimers between groups reached significance at 1 hour post-CPB. Hematocrit values at the end of CPB measured 26 +/- 6% in group A versus 22 +/- 4% in group B (P = .01). The rest of the observed parameters did not significantly differ between groups.
  
  
  CONCLUSIONS
  Postoperative blood loss was not reduced in the present study. However, the use of the CorX system leads to a significant suppression of activation of coagulation and fibrinolytic cascades compared to conventional CPB, suggesting that miniaturized extracorporeal circuits are a step forward toward reduced imbalance of hemostasis in cardiac surgery.
authors.affiliation: Department of Thoracic and Cardiovascular Surgery, Johann Wolfgang Goethe University, Frankfurt/Main, Germany. abdel-rahman@em.uni-frankfurt.de
authors.forename: Ulf
authors.initials: U
authors.lastname: Abdel-Rahman
authors.forename: Sven
authors.initials: S
authors.lastname: Martens
authors.forename: Petar
authors.initials: P
authors.lastname: Risteski
authors.forename: Feyzan
authors.initials: F
authors.lastname: Ozaslan
authors.forename: Musawir
authors.initials: M
authors.lastname: Riaz
authors.forename: Anton
authors.initials: A
authors.lastname: Moritz
authors.forename: Gerhard
authors.initials: G
authors.lastname: Wimmer-Greinecker
mesh_terms: D000368:Aged; D001777:Blood Coagulation; D002315:Cardiopulmonary Bypass / Q000295:instrumentation*; D001026:Coronary Artery Bypass; D003324:Coronary Artery Disease / Q000601:surgery; D005260:Female; D005342:Fibrinolysis; D006487:Hemostasis; D006801:Humans; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies