I have a care plan due on Monday related to a patient who has atrial fibrillation. He was on a heparin drip while in the hospital and it aPTT level kept coming back subtherapeutic, so he needed increased infusion rate as well as boluses of heparin throughout several days. He has a previous history of DVT bilaterally. He is at risk for developing thrombi, but I can't find a NANDA nursing diagnosis for this. Can anyone help me?