Abstract:
:Cirrhosis is characterized by a complex coagulation defect leading to the prolongation of the prothrombin and activated partial thromboplastin times (PT and APTT). Arbitrary PT cut-off values are still used as a yardstick to guide treatment with fresh-frozen plasma (FFP) or other pro-coagulant agents in patients undergoing invasive procedures. No randomized studies on the FFP efficacy are available, and are unlikely to be carried out because of their complex organization. An interim solution could be to evaluate the in vitro thrombin generation in plasmas from patients with cirrhosis when mixed with appropriate amounts of pooled normal plasma (PNP). The PT, APTT and thrombin generations in the presence of thrombomodulin were examined in 58 patients with cirrhosis and 24 healthy subjects both before and after mixing their plasmas with PNP at a proportion of 4 + 1 (patient + PNP), chosen to mimic in vivo conditions when patients are treated with 10 ml/kg of FFP. The PT and APTT, which were abnormal in the majority of unmixed patient plasmas were shortened considerably, but did not normalize completely when mixed with PNP. Thrombin generation, which was already within normal limits in all unmixed patient plasmas, remained essentially unchanged after mixing with PNP. In conclusion, thrombin generation in patients with cirrhosis does not appreciably change after in vitro addition of PNP despite PT and APTT shortening would suggest otherwise. These results question the validity of the PT as a stand-alone test to guide transfusion of FFP in the setting of chronic liver disease.
journal_name
Intern Emerg Medjournal_title
Internal and emergency medicineauthors
Tripodi A,Chantarangkul V,Primignani M,Clerici M,Dell'era A,Aghemo A,Mannucci PMdoi
10.1007/s11739-011-0528-4subject
Has Abstractpub_date
2012-04-01 00:00:00pages
139-44issue
2eissn
1828-0447issn
1970-9366journal_volume
7pub_type
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