Efficacy and Safety of Short-term Postoperative Anticoagulant Therapy to Prevente Thrombosis in Arterovenous Fistula

Inclusion Criteria: * After AVF formation or balloon dilation surgery, there were no significant signs of oozing or bleeding at the surgical incision and operative site observed within 12-24 hours. * The patient is willing to accept short-term anticoagulant therapy after the surgery, bear related risks, and sign an informed consent form. * The patient is willing to cooperate with this study, undergo data collection related to the research, and relevant clinical examinations. Exclusion Criteria. * Age \>80 years; * Concurrent hematologic diseases that can affect coagulation function; * Concurrent comorbidities that can affect the patient's bleeding or coagulation functions, such as liver cirrhosis; * Concurrent active bleeding disorders, such as active gastrointestinal ulcers or active lupus; * History of major organ bleeding (e.g., intracranial or gastrointestinal) or surgery within the past six months; * Unwillingness to participate in this study.