A client with advanced cirrhosis has a prothrombin time (PT) of 15 seconds, compared with a control time of 11 seconds. The nurse expects to administer:
Prothrombin synthesis in the liver requires vitamin K. In cirrhosis, vitamin K is lacking, precluding prothrombin synthesis and, in turn, increasing the client's PT. An increased PT, which indicates clotting time, increases the risk of bleeding. Therefore, the nurse should expect to administer phytonadione (vitamin K1) to promote prothrombin synthesis.