QL block with edoxaban — standard tier or strict tier?
Quadratus lumborum block planned for post-operative analgesia. Patient is on edoxaban. Is this a 24-hour or 72-hour withhold?
Clinical scenario
62-year-old male. Elective laparoscopic colectomy. Edoxaban 60 mg once daily for AF. QL block planned for post-operative analgesia. How long before the block must the last dose be withheld?
Pre-anesthesia assessment requested. The pain team is planning a bilateral QL block at the end of the case. Last edoxaban dose was taken yesterday morning, approximately 28 hours ago.
Some deep blocks have disputed classification
The quadratus lumborum block is classified as 'isDebated' — its anatomical depth and proximity to neuraxial structures means the literature does not consistently assign it to the standard tier. When a block's classification is disputed, the conservative default applies: treat it as strict tier (72h). This is the approach taken by ASRA 2022 for blocks where evidence is limited.
28 hours may not be enough
At 28 hours post-dose, the QL block cannot be performed safely under the strict 72h tier. The team should either delay the block or plan an alternative analgesic strategy.
Teaching points
- Not all regional blocks are equivalent. Some deep fascial plane blocks (QL, erector spinae, interscalene, proximal sciatic) have disputed classification and default to the strict 72h tier.
- When a block's tier is uncertain, apply the conservative default — strict tier. The cost of waiting 72h is low compared to the risk of a deep hematoma.
- Always determine the technique category before calculating timing. 'It's not a spinal' is not sufficient justification for using the standard tier.
Use the DOAC tool to check the withhold requirement for QL block and compare it to a superficial block on the same DOAC.
Verify the timing decision →Next clinical question
How does this differ from a TAP block — a superficial block — on the same DOAC?
Next case: TAP block, apixaban, and the standard tier →Continue DOAC cases
Spinal anesthesia tomorrow — but apixaban was taken this morning. Can you proceed?
67-year-old female on apixaban for atrial fibrillation. Last dose 12 hours ago. Surgery scheduled for tomorrow morning. Does the timing work?
Epidural catheter in place, rivaroxaban restarted 14 hours ago. When is it safe to remove?
58-year-old male post-cardiac surgery. Thoracic epidural running. Rivaroxaban restarted 14 hours ago on the cardiac team's instruction. The ward asks: can we remove the catheter now?
TAP block with apixaban — why does 24 hours suffice here?
Transversus abdominis plane block planned. Apixaban 5 mg twice daily. Same drug as the spinal case — but why is the window different?