Anterior Quadratus Lumborum Block at the Lateral Supra-arcuate Ligament for Analgesia After Open Liver Surgery

Ultrasound-guided Anterior Quadratus Lumborum Block at the Lateral Supra-arcuate Ligament Versus Thoracic Epidural Analgesia After Open Liver Surgery: A Prospective, Randomized, Controlled, Noninferiority Trial

This is a prospective, randomized, controlled, noninferiority trial for evaluating the efficacy of ultrasound-guided anterior quadratus lumborum block at the lateral supra-arcuate ligament versus thoracic epidural analgesia after open liver surgery.

Inclusion Criteria:

• Age≥18 years
• ASA I-III
• Open liver surgery

Exclusion Criteria:

• Contraindication to nerve block or epidural puncture
• Chronic use of opioids or NSAIDs
• Refused to participate in the study