Efficacy and Safety Study of Aspirin for the Prevention of Renal Artery Stenosis in Renal Transplantation Recipients

Inclusion Criteria: 1. The patients with the first renal transplantation were stable; 2. Age ≥ 18 years old; 3. Other anticoagulants and non steroidal anti-inflammatory drugs were not taken at the same time; 4. In the past 3 months, there was no acute cardiovascular and cerebrovascular disease or infection; 5. The rejection of acute and chronic renal transplantation was excluded; 6. The thrombus formation of transplanted kidney was excluded. Exclusion Criteria: 1. Allergic or intolerable to aspirin; 2. Previous transplant history; 3. Age \< 18; 4. Take other anticoagulants or non steroidal anti-inflammatory drugs at the same time; 5. History of active gastrointestinal bleeding or severe peptic ulcer; 6. Patients with bleeding tendency or severe liver disease; 7. Cerebral hemorrhage, cerebral infarction or acute infection occurred within 3 months; 8. Acute and chronic rejection; 9. Thrombus formation of transplanted renal vessels; 10. Any condition that increases the risk of adverse events or discontinuation.