TY - JOUR
T1 - The international normalized ratio overestimates coagulopathy in stable trauma and surgical patients
AU - McCully, Sean P.
AU - Fabricant, Loic J.
AU - Kunio, Nicholas R.
AU - Groat, Tahnee L.
AU - Watson, Katherine M.
AU - Differding, Jerome A.
AU - Deloughery, Thomas G.
AU - Schreiber, Martin A.
PY - 2013/12
Y1 - 2013/12
N2 - BACKGROUND: The international normalized ratio (INR) was developed to assess adequacy of Coumadin dosing. Its use has been generalized to guide fresh frozen plasma (FFP) therapy in stable patients. Thrombelastography (TEG) is a whole-blood assay measuring the viscoelastic properties of the clot in near real time. This study hypothesized that INR does not reflect coagulopathy and should not be used to guide FFP therapy in stable trauma and surgical patients. METHODS: Prospective observational data were collected from stable trauma and surgical patients (n = 106) who received FFP transfusions. Pretransfusion and posttransfusion blood samples were obtained to assess complete blood count, standard coagulation parameters (INR, partial thromboplastin time, fibrinogen and D-dimer), soluble clotting factors (2, 5, 7, 8, 9, 10, 11, 12, proteins C and S) and TEG. Data were analyzed using a Mann-Whitney U-test. Significance was defined as p G 0.05. RESULTS: A total of 262 U of FFP were transfused, with 78% of 106 patients receiving two or more units. Despite a reduction in INR, median TEG values remained within normal limits, while clotting factor levels retained adequate function to produce normal clotting before and following FFP transfusion. CONCLUSION: The use of FFP in this population did not affect coagulation status in a clinically relevant manner based on TEG values and coagulation factor function. INR is not a predictor of coagulopathy and should not be used to guide coagulation factor replacement in stable trauma and surgical patients.
AB - BACKGROUND: The international normalized ratio (INR) was developed to assess adequacy of Coumadin dosing. Its use has been generalized to guide fresh frozen plasma (FFP) therapy in stable patients. Thrombelastography (TEG) is a whole-blood assay measuring the viscoelastic properties of the clot in near real time. This study hypothesized that INR does not reflect coagulopathy and should not be used to guide FFP therapy in stable trauma and surgical patients. METHODS: Prospective observational data were collected from stable trauma and surgical patients (n = 106) who received FFP transfusions. Pretransfusion and posttransfusion blood samples were obtained to assess complete blood count, standard coagulation parameters (INR, partial thromboplastin time, fibrinogen and D-dimer), soluble clotting factors (2, 5, 7, 8, 9, 10, 11, 12, proteins C and S) and TEG. Data were analyzed using a Mann-Whitney U-test. Significance was defined as p G 0.05. RESULTS: A total of 262 U of FFP were transfused, with 78% of 106 patients receiving two or more units. Despite a reduction in INR, median TEG values remained within normal limits, while clotting factor levels retained adequate function to produce normal clotting before and following FFP transfusion. CONCLUSION: The use of FFP in this population did not affect coagulation status in a clinically relevant manner based on TEG values and coagulation factor function. INR is not a predictor of coagulopathy and should not be used to guide coagulation factor replacement in stable trauma and surgical patients.
KW - Coagulation
KW - FFP transfusion
KW - INR
KW - TEG
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U2 - 10.1097/TA.0b013e3182a9676c
DO - 10.1097/TA.0b013e3182a9676c
M3 - Article
C2 - 24256665
AN - SCOPUS:84890082585
SN - 2163-0755
VL - 75
SP - 947
EP - 953
JO - Journal of Trauma and Acute Care Surgery
JF - Journal of Trauma and Acute Care Surgery
IS - 6
ER -