📋 Key Information Summary
- Major burns (≥20% TBSA in adults, ≥10% TBSA in children, or burns involving face, hands, feet, perineum, or circumferential injuries) generate severe mixed nociceptive and neuropathic pain requiring multimodal analgesia under specialist burns centre guidance.
- Acute burn pain peaks in the first 48–72 hours and comprises background (continuous resting) pain, breakthrough pain, and procedural pain — each requiring a tailored approach.
- Neuropathic pain develops in up to 50% of major burn survivors; early recognition and initiation of gabapentinoids or tricyclic antidepressants reduces chronicity.
- Procedural pain (wound dressing changes, debridement, physiotherapy) is the most distressing component — pre-medicate 30–60 minutes before procedures with short-acting opioids ± nitrous oxide or ketamine sub-anaesthetic infusions.
- First-line background analgesia: regular paracetamol (1 g QID IV or PO) + regular NSAIDs (where not contraindicated) + low-dose opioid infusion (morphine or fentanyl) titrated to comfort in the acute phase.
- Ketamine sub-anaesthetic infusion (0.1–0.3 mg/kg/hr IV) is strongly recommended as an adjunct for major burns analgesia, reducing opioid requirements and providing anti-hyperalgesic effects.
- Regional anaesthesia (e.g., fascia iliaca block, brachial plexus catheter, epidural) should be considered early for limb burns where feasible and should be discussed with the burns anaesthetist.
- Avoid meperidine (pethidine) for burn pain — its metabolite normeperidine accumulates and causes seizures, particularly with repeated dosing in renal impairment.
- Chronic burn pain (persisting >3 months post-injury) affects 30–50% of survivors; screen at every outpatient visit using validated tools (DN4, Brief Pain Inventory) and refer to pain medicine if inadequate control.
- Phantom burn pain and itch are distinct neuropathic phenomena requiring specific management with gabapentinoids, amitriptyline, or duloxetine.
- Non-pharmacological strategies (virtual reality, distraction, music therapy, psychological support, early mobilisation) are evidence-based adjuncts that must be integrated alongside pharmacotherapy.
- Aboriginal and Torres Strait Islander patients have higher rates of burn injury, are more likely to present from remote settings with delayed transfer, and require culturally safe pain assessment and management with interpreter support where needed.
Introduction & Australian Epidemiology
Burns are among the most painful injuries experienced by humans. Major burns — defined as burns involving ≥20% total body surface area (TBSA) in adults, ≥10% TBSA in children, or those involving critical areas such as the face, hands, feet, perineum, or circumferential extremity burns — produce a complex, multifaceted pain syndrome that is both nociceptive and neuropathic in nature. Pain management in major burns is widely recognised as one of the most challenging problems in acute medicine, requiring specialist multidisciplinary input from burns surgeons, anaesthetists, pain medicine specialists, physiotherapists, psychologists, and nursing staff.
In Australia, approximately 6,000–8,000 people are hospitalised with burn injuries each year, with direct healthcare costs exceeding 0 million annually (AIHW, 2023). The Australian and New Zealand Burn Association (ANZBA) maintains a network of 17 specialised burns units, with major centres located at the Royal Adelaide Hospital, Royal Brisbane and Women's Hospital, Royal Perth Hospital, The Alfred (Melbourne), and Westmead Children's Hospital (Sydney). Aboriginal and Torres Strait Islander Australians are disproportionately represented, with burn admission rates approximately 2.5 times higher than non-Indigenous Australians, particularly in children under 5 years of age in remote and very remote communities.
Pain from burns is unique in its severity, duration, and complexity. Patients with major burns may experience multiple concurrent pain types — background (resting) pain, breakthrough pain, procedural pain, and neuropathic pain — each with distinct mechanisms and each requiring a specific therapeutic strategy. Inadequately treated acute burn pain contributes to the development of chronic pain syndromes, post-traumatic stress disorder (PTSD), anxiety, depression, and delayed rehabilitation. This article provides a comprehensive, evidence-based framework for the assessment and management of pain in major burns, with specific attention to Australian practice, PBS-listed medications, and the needs of special populations.
Pathophysiology of Burn Pain
Burn injury produces a unique neuroinflammatory milieu that generates pain through multiple simultaneous mechanisms. Understanding these pathways is essential for rational multimodal analgesic prescribing.
Zones of Burn Injury
A burn wound consists of three concentric zones:
- Zone of coagulation: The central area of irreversible tissue destruction. Nerve endings are destroyed, producing an area of anaesthesia within the deepest part of the wound.
- Zone of stasis: Surrounding tissue with reduced perfusion. Nerve endings are damaged but viable, producing intense nociceptive and neuropathic signalling. This zone is the target of resuscitation and the primary source of background pain.
- Zone of hyperaemia: The outermost zone with increased perfusion and inflammation. Nerve endings are intact but sensitised by inflammatory mediators, contributing to allodynia and hyperalgesia.
Nociceptive Mechanisms
Tissue destruction releases a flood of inflammatory mediators — bradykinin, prostaglandins (PGE₂), histamine, serotonin, substance P, calcitonin gene-related peptide (CGRP), and cytokines (IL-1β, IL-6, TNF-α). These substances activate and sensitise peripheral nociceptors (Aδ and C fibres), lowering their activation thresholds. Ongoing tissue damage from wound care, debridement, and dressing changes perpetuates nociceptive input. The systemic inflammatory response syndrome (SIRS) associated with major burns amplifies central sensitisation.
Neuropathic Mechanisms
Burn injury causes direct damage to peripheral nerve fibres, leading to aberrant regeneration, neuroma formation, and ectopic firing. The zone of stasis contains partially damaged nerves that develop spontaneous activity. Central sensitisation occurs rapidly in the dorsal horn of the spinal cord, with upregulation of NMDA receptors, wind-up phenomena, and expansion of receptive fields. Sympathetic nervous system activation further modulates pain through sympatho-afferent coupling. These neuropathic mechanisms explain why burn pain often persists long after wound healing and why standard opioid-based analgesia alone is frequently inadequate.
Pruritus–Pain Overlap
Burn-related pruritus (itch) shares overlapping neural pathways with pain, particularly through C-fibre activation and histamine-independent mechanisms mediated by interleukin-31 and transient receptor potential channels (TRPV1, TRPA1). Up to 87% of burn patients experience significant pruritus, which is itself a source of distress and can interfere with sleep, rehabilitation, and wound healing. Management of itch is integral to comprehensive burn pain care.
Acute Burn Pain
Acute burn pain is the pain experienced from the time of injury through the initial healing phase (typically the first 2–4 weeks for major burns). It is among the most severe forms of acute pain encountered in clinical practice, frequently rated 9–10/10 on numerical rating scales. Acute burn pain is not monolithic — it comprises distinct components, each with its own temporal profile and optimal management strategy.
Components of Acute Burn Pain
| Pain Component | Character | Timing | Primary Mechanism | Management Approach |
|---|---|---|---|---|
| Background pain | Continuous, burning, throbbing, aching | Constant, peaks 48–72 hrs | Nociceptive + early neuropathic | Regular multimodal analgesia + opioid infusion |
| Breakthrough pain | Sudden, severe, lancinating | Episodic, unpredictable | Nociceptive flares + neuropathic | PRN IV opioid boluses + non-pharmacological |
| Procedural pain | Intense, sharp, aversive | With dressing changes, debridement, physio | Nociceptive (wound manipulation) | Pre-procedural opioids ± ketamine ± regional |
| Operative pain | Post-surgical, throbbing | Post-debridement/grafting | Surgical + burn nociception | GA/RA intraop; multimodal post-op |
Multimodal Analgesia — Acute Phase
The Australian and New Zealand Burn Association (ANZBA) and the Royal Australasian College of Physicians recommend a multimodal approach combining agents that act at different points along the nociceptive pathway. No single agent is sufficient for major burns pain.
Regional Anaesthesia in Acute Burns
Regional anaesthetic techniques should be considered early in the management of limb burns and are strongly recommended where feasible. Options include:
- Peripheral nerve catheters: Continuous brachial plexus catheter (for upper limb burns), fascia iliaca compartment catheter or femoral/sciatic catheter (for lower limb burns). Provide superior analgesia, reduce opioid consumption by 40–60%, and facilitate physiotherapy.
- Thoracic epidural: For chest/back burns or rib fractures associated with inhalation injury. Provides excellent bilateral analgesia but requires careful coagulation monitoring (burns patients develop coagulopathy).
- Topical local anaesthesia: Lidocaine (lignocaine) 4–5% liposomal cream applied under occlusion to donor sites 30–60 min pre-harvesting reduces donor-site pain.
Acute Burns Pain — Quick Reference
Neuropathic Component
Neuropathic pain is a hallmark of major burns and is present in up to 50% of patients during the acute phase and 30–50% in the chronic phase. It arises from direct peripheral nerve injury, inflammatory-mediated nerve damage, and central sensitisation. The neuropathic component often coexists with nociceptive pain (mixed pain), making assessment and management particularly challenging.
Clinical Features Suggesting Neuropathic Pain
- Burning, shooting, lancinating, or electric-shock sensations — especially beyond the wound margins
- Allodynia (pain from non-painful stimuli such as light touch, clothing, or bed sheets)
- Hyperalgesia (exaggerated pain response to painful stimuli)
- Dysaesthesia (unpleasant abnormal sensation, often spontaneous)
- Phantom burn pain (pain perceived in an area that has been grafted or healed)
- Pain disproportionate to wound appearance
- Poor response to standard opioid titration alone
Assessment Tools
The Douleur Neuropathique 4 (DN4) questionnaire is recommended as a screening tool for neuropathic pain in burns patients. A score ≥4/10 has a sensitivity of 83% and specificity of 90% for neuropathic pain. The Leeds Assessment of Neuropathic Symptoms and Signs (LANSS) scale is an alternative. Both tools should be used at admission and at regular intervals throughout recovery.
Pharmacological Management of Neuropathic Burn Pain
Procedural Pain
Procedural pain — caused by wound assessment, dressing changes, debridement, hydrotherapy, and physiotherapy — is consistently rated by burns patients as the single most distressing component of their care, often exceeding the pain of the original injury. Major burns patients undergo dressing changes every 1–3 days, with sessions lasting 30–90 minutes. Effective procedural pain management requires advance planning, pre-medication, and a structured approach.
Procedural Pain Management Protocol
Entonox® (Nitrous Oxide/Oxygen)
Non-Pharmacological Approaches to Procedural Pain
| Intervention | Evidence Level | Description | Australian Availability |
|---|---|---|---|
| Virtual Reality (VR) | Strong (Level I) | Immersive VR (e.g., SnowWorld, Bear Blast) reduces procedural pain scores by 30–50% and opioid consumption. Engages attentional resources, reduces pain perception. | Available at most major Australian burns units (Royal Perth, Alfred, Westmead Children's). Portable systems increasingly accessible. |
| Music therapy | Moderate (Level II) | Patient-selected music played during procedures reduces anxiety, pain perception, and heart rate. Accredited music therapists available in many burns units. | Available at major burns centres. Music therapist-led sessions recommended where possible. |
| Distraction techniques | Moderate (Level II) | Age-appropriate distraction (tablet games, conversation, guided imagery) during procedures. Most effective when patient selects preferred distraction method. | Universally available. Minimal cost. |
| Hypnosis | Moderate (Level II) | Clinical hypnosis by trained practitioners reduces procedural pain and anxiety. Requires trained personnel and patient willingness. | Available at select centres with clinical psychology departments. |
| Relaxation/breathing exercises | Moderate (Level II) | Controlled breathing, progressive muscle relaxation. Easy to teach, self-administered. Reduces sympathetic activation during painful procedures. | Universally available. Can be taught by any member of the multidisciplinary team. |
Chronic Burn Pain
Chronic pain following burns — defined as pain persisting beyond 3 months post-injury — affects 30–50% of major burn survivors and represents one of the most significant long-term morbidity burdens. Chronic burn pain is often mixed nociceptive and neuropathic, and its presence is strongly associated with reduced quality of life, impaired functional recovery, PTSD, depression, and impaired return to work.
Types of Chronic Burn Pain
- Neuropathic pain: Burning, shooting, electric-shock sensations. Often at wound margins or in areas of skin grafting. May be constant or episodic. Worst at night. Present in 30–50% of chronic burn patients.
- Musculoskeletal pain: Arising from contractures, disuse atrophy, heterotopic ossification, joint stiffness, and abnormal biomechanics. Common after deep partial-thickness and full-thickness burns.
- Donor-site pain: Split-thickness skin graft donor sites (commonly thighs) can remain painful for months, particularly with wound healing complications or infection.
- Phantom burn pain: Pain perceived in areas that have been grafted or healed — analogous to phantom limb pain. Thought to reflect cortical reorganisation.
- Hypertrophic scar pain: Raised, itchy, painful scars are the most common complication of burn healing. Pain is often activity-related and exacerbated by temperature changes, clothing, and sunlight.
- Itch (pruritus): Often co-located with pain and functionally debilitating. Up to 87% of burn survivors report significant pruritus at 12 months.
Chronic Burn Pain Assessment
Systematic screening at every outpatient follow-up visit is essential. Recommended assessment tools include:
- Numerical Rating Scale (NRS) — resting pain, movement pain, worst pain in 24 hours
- DN4 questionnaire — neuropathic pain screening (≥4/10 positive)
- Brief Pain Inventory (BPI) — pain interference with function, mood, sleep, work
- Itch Severity Scale — dedicated assessment of pruritus
- DASS-21 — depression, anxiety, stress screening
- PCL-5 — PTSD screening
Pharmacological Management of Chronic Burn Pain
Management of Chronic Pruritus
When to Refer to Pain Medicine
Investigations
Pain assessment in major burns requires structured, validated tools alongside physiological monitoring. There is no single laboratory test that quantifies burn pain, but investigations support safe prescribing and identify comorbidities that complicate pain management.
Risk Stratification & Pain Severity
Major burns pain severity is influenced by burn depth, TBSA, anatomical location, patient age, psychological comorbidity, and mechanism of injury. Risk stratification guides the intensity of analgesic intervention and the level of monitoring required.
Directed / Multimodal Therapy Regimens
Tier 1 — All Major Burns (Foundation)
- Paracetamol 1 g IV/PO QID (regular, not PRN)
- Ibuprofen 400 mg PO TDS (or meloxicam 15 mg PO daily if once-daily preferred) — unless contraindicated
- Gabapentin 100–300 mg PO nocte (commence Day 1; titrate to effect) — for anti-hyperalgesic and neuropathic prophylaxis
- Non-pharmacological strategies: distraction, music therapy, relaxation, warm environment
- Regular pain assessment Q4H (NRS at rest and with movement)
Tier 2 — Moderate-to-Severe Acute Pain
- All Tier 1 measures PLUS:
- Morphine or fentanyl IV infusion for background pain (target NRS ≤4/10)
- Patient-controlled analgesia (PCA) for breakthrough pain in cognitively intact patients aged ≥6 years
- Ketamine sub-anaesthetic infusion 0.1–0.3 mg/kg/hr IV as opioid-sparing adjunct
- Entonox® for procedural pain (dressing changes, physiotherapy)
- Regional anaesthesia (peripheral nerve catheter) where feasible for limb burns
Tier 3 — Refractory Pain / Complex Cases
- All Tier 1 + Tier 2 measures PLUS:
- Escalation of gabapentinoid dose (gabapentin to 600 mg TDS or pregabalin 300 mg BD) class="guideline-li">Addition of amitriptyline 10–25 mg nocte or duloxetine 60 mg daily for neuropathic pain
- Intranasal ketamine 10–15 mg per nostril for procedural pre-medication (where IV access difficult)
- Dexmedetomidine infusion (0.2–0.7 mcg/kg/hr) for sedation-analgesia in ICU patients — reduces opioid requirements without respiratory depression
- Referral to pain medicine specialist (FFPMANZCA)
- Psychology-led cognitive behavioural therapy (CBT) for pain catastrophising and PTSD prevention
- Virtual reality immersion for procedural pain
Monitoring
Systematic monitoring of pain, analgesic efficacy, side-effects, and functional outcomes is essential throughout the acute and recovery phases of major burns care.
| Parameter | Frequency (Acute Phase) | Frequency (Recovery/Outpatient) | Target |
|---|---|---|---|
| Pain score (NRS) at rest | Q4H minimum | Each clinic visit | ≤4/10 |
| Pain score (NRS) with movement/procedure | Before and during each procedure | Each clinic visit | ≤6/10 (procedural) |
| Sedation score (RASS or Pasero Opioid Sedation Scale) | Q2–4H during opioid infusions | As needed | RASS 0 to −1 |
| Respiratory rate | Q1–2H during IV opioid infusions | Each clinic visit | ≥10 breaths/min |
| DN4 neuropathic pain screen | Admission + weekly | Each clinic visit | Early detection if ≥4 |
| Pruritus severity (5-D itch scale) | Daily from Day 7 | Each clinic visit | Mild or improving |
| Brief Pain Inventory (BPI) | At admission | Monthly for 12 months | Declining interference scores |
| DASS-21 (depression, anxiety, stress) | Within 1 week of admission | Each clinic visit | Early intervention if elevated |
| Renal function (eGFR) | Daily during opioid/NSAID therapy | Fortnightly until stable | Dose adjustment if declining |
Special Populations
Aboriginal and Torres Strait Islander Health Considerations
Aboriginal and Torres Strait Islander Australians experience burn injuries at approximately 2.5 times the rate of non-Indigenous Australians, with the disparity greatest in children under 5 years in remote and very remote communities (AIHW, 2023). The intersection of burns pain management with the social determinants of health, cultural considerations, and geographic remoteness creates specific challenges that must be addressed to provide equitable care.
📚 References
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