A client with deep vein thrombosis (DVT) is receiving a continuous heparin IV infusion. The client now has tarry, black diarrhea and reports abdominal pain. Which actions should the nurse implement? Select all that apply.

A. Assess characteristics of pain: Abdominal pain in a client on heparin may indicate gastrointestinal bleeding or other complications. Assessing the pain's onset, location, intensity, and nature is crucial for determining severity and guiding further intervention. B. Monitor stools for presence of blood: The presence of tarry, black stools suggests upper gastrointestinal bleeding. Monitoring stool characteristics helps determine the extent and progression of bleeding, which may be related to anticoagulation therapy. C. Auscultate bowel sounds in all quadrants: While part of a routine abdominal exam, listening to bowel sounds does not directly help in evaluating active bleeding or guiding immediate response to possible anticoagulant-induced hemorrhage. D. Review last partial thromboplastin time (PTT) results: Reviewing the PTT is essential to evaluate the effectiveness and safety of heparin therapy. A prolonged PTT can increase bleeding risk and may require adjusting or holding the infusion. E. Prepare to administer warfarin: Warfarin is not appropriate in the acute setting of suspected heparin-induced bleeding. It is introduced only after stabilization and overlap with heparin under careful monitoring, not during active bleeding symptoms.