Regional analgesia and recovery after trauma and surgery

Regional techniques improve acute trauma and surgical pain and reduce complications when matched to the injury, but rising limb pain under a block can be compartment syndrome, and plane blocks cover somatic, not visceral, pain.

1. Hip fracture blocks reduce delirium. Across 49 trials, peripheral nerve blocks cut pain on movement by about 2.5 points and acute confusion (risk ratio 0.67; number needed to treat 12) ¹.
2. Rib fractures: consider epidural analgesia. A trauma guideline conditionally recommends epidural analgesia with multimodal analgesia for blunt thoracic trauma, although evidence quality is low ².
3. Paravertebral matches epidural after thoracotomy. Analgesia was comparable, with less hypotension (risk ratio 0.16), nausea and vomiting, pruritus and urinary retention ³.
4. Plane blocks are somatic. The transversus abdominis plane block provides somatic abdominal wall analgesia but lacks visceral coverage, so it supplements rather than replaces systemic multimodal analgesia ⁵.
5. Intercostal blocks absorb fast. The highly vascular intercostal space gives among the highest systemic local anesthetic absorption and pneumothorax risk; prevention relies on ultrasound, incremental injection, dose limits and available lipid emulsion ⁶.
6. Regional anaesthesia can prevent persistent pain. It reduced pain 3–12 months after breast cancer surgery (odds ratio 0.43), and epidural analgesia reduced it after thoracotomy (0.52) ⁷.

Pain greater than expected or rising despite a working block after limb trauma, especially a tibial shaft fracture, suggests compartment syndrome; measure compartment pressure ⁴.

• Tibial shaft fracture accounts for about 40% of acute compartment syndrome after extremity trauma ⁴.
• Palpable pulses do not exclude compartment syndrome, because pulses are lost only late ⁴.
• Hip fracture blocks probably reduce chest infection (risk ratio 0.41) and speed first mobilization by about 11 hours ¹.
• Paravertebral and epidural analgesia did not differ in 30-day mortality, major complications or length of stay ³.
• Pain after laparoscopic colorectal surgery has somatic (incisions, ports) and visceral (peritoneal stretch) components ⁵.
• Whiplash pain and disability fall fastest in the early months and show little further improvement once about 3 months have passed ⁸.
• In reported cases, breakthrough pain despite a nerve block was usually a good indicator of developing compartment syndrome ⁴.
• The hip block effect grew with local anesthetic concentration, and people with dementia were often excluded from trials ¹.

• Intensifying a block or adding opioids for escalating limb pain instead of checking compartments ⁴.
• Expecting a transversus abdominis plane block to relieve visceral cramping ⁵.
• Escalating sedating systemic opioids for rib fractures instead of regional analgesia ².
• Assuming palpable pulses rule out compartment syndrome ⁴.