In an elderly patient with calf pain and a nonocclusive thrombus found on ultrasound, what could indicate a potential complication after heparin administration?

The correct choice is related to the risk of hematoma after heparin administration in an elderly patient. Heparin, an anticoagulant medication, is used to prevent the extension of thrombosis or to reduce the risk of new clot formation. However, one of the notable complications of anticoagulation therapy, especially in elderly individuals who may have fragile vasculature and other comorbidities, is the development of hematoma.

A hematoma occurs when bleeding leads to the accumulation of blood outside of blood vessels. In the context of anticoagulation, the risk of bleeding increases, and if this occurs in a subcutaneous space, it may create a hematoma. This can especially happen at the site of injection for heparin or due to falls or injuries that are common in older patients.

Understanding this risk is crucial for clinicians when managing anticoagulation therapy in older adults, as they may require closer monitoring for signs of bleeding and potential hematoma formation. Recognizing the importance of these factors can lead to better patient outcomes and tailored treatment approaches.

Other options such as fatty embolism, deep vein thrombosis, and controlled hemorrhage do not directly relate to the complications anticipated specifically from heparin therapy in this scenario.