"Efficacy and Safety of a Four-Factor Prothrombin Complex Concentrate (4F-PCC) in Patients on Vitamin K Antagonists Presenting with Major Bleeding" 
Circ Aug 9
http://circ.ahajournals.org/content/early/2013/08/09/CIRCULATIONAHA.113.002283.abstract
"Conclusions—4F-PCC is an effective alternative to plasma for urgent reversal of VKA therapy in major bleeding events as demonstrated by clinical assessments of bleeding and laboratory measurements of INR and factor levels."