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Background  Perioperative hemorrhage may depend on coagulation competence and this study evaluated the influence of coagulation competence on blood loss during cystectomy due to bladder cancer.    Methods  Forty patients undergoing radical cystectomy were included in a randomized controlled trial to receive either lactated Ringer’s solution or Dextran 70 (Macrodex ®) that affects coagulation competence.    Results  By thrombelastography evaluated coagulation competence, Dextran 70 reduced “maximal amplitude” (MA) by 25 % versus a 1 % reduction with the administration of lactated Ringer’s solution ( P  <0.001). Blinded evaluation of the blood loss was similar in the two groups of patients - 2339 ml with the use of Dextran 70 and 1822 ml in the lactated Ringer’s group ( P  = 0.27). Yet, the blood loss was related to the reduction in MA ( r  = −0.427,  P  = 0.008) and by multiple regression analysis independently associated with MA ( P  = 0.01). Thus, 11 patients in the dextran group (58 %) developed a clinical significant blood loss (>1500 ml) compared to only four patients (22 %) in the lactated Ringer’s group ( P  = 0.04).    Conclusions  With the use of Dextran 70 vs. lactated Ringer’s solution during cystectomy, a relation between hemorrhage and coagulation competence is demonstrated. Significant bleeding develops based on an about 25 % reduction in thrombelastography determined maximal amplitude. A multivariable model including maximal amplitude discriminates patients with severe perioperative bleeding during cystectomy.    Trial registration  The study was accepted on January 7 th , 2013 at  www.clinicaltrialsregister.eu  EudraCT  2012-005040-20 .

Coagulation competence for predicting perioperative hemorrhage in patients treated with lactated Ringer’s vs. Dextran - a randomized controlled trial