Aspirin Resumption After URS/RIRS for Renal Stones
Aspirin should be resumed within 24 hours after URS/RIRS surgery, ideally on the same day of the procedure if hemostasis is adequate.
Evidence-Based Recommendation
The most recent high-quality guidelines from the American College of Chest Physicians (2022) and French Working Group on Perioperative Haemostasis (2018) provide clear direction on antiplatelet management. For aspirin specifically, resumption should occur as early as possible after the invasive procedure, preferably the same day, according to postoperative bleeding risk 1. The ACCP guidelines similarly recommend resuming antiplatelet therapy within 24 hours post-procedure at maintenance doses 2.
Clinical Algorithm for Aspirin Resumption
Immediate Assessment (Day of Surgery):
- If hemostasis is adequate and no active bleeding: Resume aspirin the evening of surgery (within 24 hours)
- If inadequate hemostasis or concerning bleeding: Delay resumption but reassess daily
Key Decision Points:
- Assess surgical site hemostasis - This is the primary determinant
- Evaluate urine clarity - Minimal hematuria is acceptable
- Consider cardiovascular risk - Patients on aspirin typically have significant cardiac/vascular disease where prolonged interruption poses thrombotic risk
Supporting Evidence from Urologic Literature
Research specifically examining aspirin in urologic stone surgery strongly supports early resumption:
A 2007 randomized trial in lower urinary tract surgeries (including transurethral procedures) found no increased bleeding risk with aspirin initiation 24 hours after discontinuing bladder irrigation compared to waiting 3 weeks (16.7% vs 10% complication rates, p=0.28) 3
A 2014 study of PCNL patients demonstrated that continuing aspirin throughout the perioperative period resulted in no differences in hemoglobin change, transfusion rates, or complications compared to those who stopped aspirin 4
A 2024 study confirmed that continued aspirin use did not increase postoperative complications in PCNL patients, with hematologic complications only associated with additional anticoagulation medications 5
Critical Caveats
Delay Resumption If:
- Active bleeding requiring bladder irrigation
- Anticipated need for additional intervention within 48-72 hours
- Patient on multiple antithrombotic agents (significantly increases bleeding risk) 5
- Inadequate surgical hemostasis documented intraoperatively
Common Pitfall to Avoid:
Do not routinely delay aspirin for 3 weeks or longer - this outdated practice increases cardiovascular morbidity without proven bleeding benefit. The 2007 trial noted all 3 cardiovascular events occurred in patients assigned to early treatment, but this likely reflects the high-risk population rather than treatment timing 3.
Practical Implementation
Standard approach: Resume aspirin at usual maintenance dose (typically 81 mg daily) on the evening of surgery if:
- Urine is clearing or only minimally blood-tinged
- No active bleeding requiring intervention
- Vital signs stable
High-risk bleeding scenarios (large stone burden, extensive manipulation, intraoperative bleeding): Consider 24-48 hour delay with daily reassessment, but avoid prolonged interruption beyond 72 hours given thrombotic risk 1.
The evidence consistently demonstrates that URS/RIRS procedures have lower bleeding risk than PCNL, making early aspirin resumption even more appropriate in this population 4, 5.