Epidural Anesthesia Guidelines for Intraoperative Use

Initial Loading Dose and Infusion Rates

The American Society of Anesthesiologists recommends administering a loading dose of 15-25 mL of long-acting local anesthetic (bupivacaine 0.5-0.75% or ropivacaine 0.5-0.75%) as a bolus or continuous infusion, with onset expected in 10-30 minutes depending on concentration used 1, 2
For intraoperative epidural anesthesia, maintain with continuous epidural infusion at 5-14 mL/hour of dilute local anesthetic (bupivacaine 0.175-0.2% or ropivacaine 0.2%) combined with opioid (fentanyl 2-2.5 μg/mL or sufentanil 0.75-1 μg/mL) 3, 1, 2

The American Society of Regional Anesthesia and Pain Medicine suggests adding clonidine 1-2 μg/kg (30-75 μg in adults) to the local anesthetic for prolonged intraoperative analgesia and reduced postoperative opioid requirements 4, 1, 4
Alternatively, add fentanyl 2-2.5 μg/mL or sufentanil 0.75-1 μg/mL to the continuous infusion for opioid-sparing multimodal analgesia 5, 3, 4

The American Heart Association recommends measuring blood pressure every 5 minutes for at least 15 minutes following the loading dose and after any bolus administration 6
Assess sensory level every 5 minutes until no further extension is observed, then hourly during continuous infusion 1, 7
Monitor for motor block using Bromage score or straight-leg raising ability hourly 7

Use only preservative-free formulations for all neuraxial medications to prevent neurotoxicity 4
When using epidural analgesia with concurrent LMWH for VTE prophylaxis, adhere strictly to timing guidelines: withhold LMWH for at least 12 hours before catheter removal and do not restart until at least 4 hours after removal 3