Management of Rebound Pain After Peripheral Nerve Blocks

Incidence and Core Prevention Principle

• Up to 61 % of patients experience severe rebound pain when a peripheral nerve block resolves; scheduled multimodal analgesia (paracetamol + NSAID/COX‑2 inhibitor) started before block wear‑off together with a single 8 mg IV dexamethasone dose at induction markedly reduces this risk【1】.

Multimodal Pharmacologic Prevention

Scheduled Non‑Opioid Analgesia

• Paracetamol (acetaminophen) given regularly throughout the peri‑operative period and continued post‑operatively prevents rebound pain【1】.
• NSAID or COX‑2 inhibitor combined with paracetamol (unless contraindicated, e.g., therapeutic anticoagulation or severe liver disease) is essential for rebound‑pain prophylaxis【1】.

Dexamethasone

• A single 8 mg IV dexamethasone dose at induction prolongs block duration, lowers supplemental analgesic needs, and independently reduces the incidence of rebound pain【1】.

Timing of Administration

• All preventive medications must be administered before the regional block wears off; initiating analgesics after pain returns eliminates the prophylactic benefit【1】.

Procedure‑Specific Regional Techniques

Shoulder (Rotator‑Cuff Repair)

• Continuous interscalene block provides superior analgesia to single‑shot techniques, which only last 6–8 h and are associated with rebound pain at 24 h【1】.

Thoracic (VATS)

• Paravertebral block or erector spinae plane (ESP) block should be incorporated into multimodal analgesia for thoracic surgery【3】.
• Serratus anterior plane block adds further pain reduction when combined with systemic analgesics【3】.

Abdominal Surgery

• Transversus abdominis plane (TAP) block or rectus sheath block yields opioid‑sparing effects when used with scheduled non‑opioids【4】.
• Continuous local wound‑infusion catheters consistently lower pain scores and opioid consumption without increasing infection risk【4】.

Adjunctive Perineural and Systemic Strategies

• Perineural dexmedetomidine added to local anesthetic solutions prolongs block duration【3】.
• Intravenous lidocaine infusion (1–2 mg/kg bolus, then 1–2 mg/kg/h) provides analgesic and anti‑hyperalgesic effects when regional anesthesia alone is insufficient【5】.
• Ketamine 0.5 mg/kg IV may be added for patients at high risk of severe pain or those on chronic opioid therapy【5】.

Rescue Analgesia

• First‑line rescue: Nalbuphine 0.1–0.2 mg/kg IV, titrated to effect and repeatable every 3–4 h as needed【5】.
• Alternative opioids: Intravenous fentanyl or morphine with appropriate monitoring【6】【7】.
• Maintain scheduled non‑opioids (paracetamol + NSAID/COX‑2 inhibitor) even when rescue opioids are administered【2】.

Patient Education

• Patients should be informed preoperatively that a single‑shot block typically resolves within 12–24 h, and they must begin scheduled analgesics before pain returns to avoid severe rebound pain【1】.