2576
STUDY DESIGN AND METHODS : Plasma samples from before and after CPB were analyzed postoperatively for argatroban concentration using a modified ecarin clotting time ( ECT ) assay .
 argatroban
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 argatroban