Pain Management in Rehabilitation

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Pain Management in Rehabilitation - Decoding Discomfort

  • Pain Types:
    • Nociceptive: From tissue injury (somatic/visceral). E.g., arthritis, post-op pain.
    • Neuropathic: From nerve damage/disease. E.g., diabetic neuropathy, radiculopathy. Characterized by burning, tingling.
    • Nociplastic: Altered pain processing. E.g., fibromyalgia, central sensitization. Widespread pain.
  • Core Concepts:
    • Pain Pathway: Transduction → Transmission → Perception → Modulation.
    • Gate Control Theory: Non-painful input can close "gates" to pain signals. Gate Control Theory of Pain Diagram

⭐ Allodynia (pain from non-painful stimuli) and hyperalgesia (exaggerated pain response) are key features in neuropathic/nociplastic pain.

Pain Management in Rehabilitation - Measuring Misery

  • Subjective Pain Scales: Essential for quantifying patient experience.
    • Visual Analog Scale (VAS): 0-10 cm line; patient marks pain level.
    • Numeric Rating Scale (NRS): Patient verbally rates pain 0 (no pain) to 10 (worst imaginable pain).
    • Wong-Baker FACES Pain Rating Scale: Uses facial expressions; for children or communication-impaired adults.
    • McGill Pain Questionnaire (MPQ): Comprehensive; assesses sensory, affective, and evaluative dimensions.
  • Objective Indicators (Supportive):
    • Physiological signs (acute pain): ↑HR, ↑BP.
    • Functional assessment: Range of Motion (ROM), activity tolerance, gait analysis. Pain Scales: VAS, NRS, VRS, and Wong-Baker FACES

⭐ The McGill Pain Questionnaire (MPQ) is a multidimensional tool that provides a more detailed pain profile than unidimensional scales like VAS or NRS by assessing sensory, affective, and evaluative components of pain experience. This allows for more targeted therapeutic interventions in rehabilitation settings for complex pain conditions like neuropathic pain or chronic regional pain syndrome (CRPS).

Pain Management in Rehabilitation - Pill Power

  • Goal: Functional improvement, not just pain elimination. Prioritize multimodal approach.
  • WHO Analgesic Ladder: Guiding principle for pharmacological management.
  • Non-Steroidal Anti-Inflammatory Drugs (NSAIDs):
    • E.g., Ibuprofen, Diclofenac, Naproxen, Etoricoxib.
    • MOA: COX inhibition (↓Prostaglandins).
    • SE: GI ulcers, renal toxicity, cardiovascular risks. ⚠️ Use with caution in elderly & co-morbidities.
  • Opioids:
    • Weak: Tramadol (dual action: µ-agonist, SNRI), Tapentadol.
    • Strong: Morphine, Fentanyl, Buprenorphine.
    • SE: Constipation (most common), nausea, sedation, respiratory depression, dependence. ⚠️ Monitor closely.
    • Antidote: Naloxone.
  • Adjuvant Analgesics: Target specific pain types.
    • Neuropathic pain:
      • Anticonvulsants: Gabapentin, Pregabalin.
      • Antidepressants: TCAs (Amitriptyline), SNRIs (Duloxetine).
    • Musculoskeletal pain: Muscle relaxants (e.g., Baclofen, Tizanidine).
    • Topical agents: Lidocaine patches, Capsaicin cream.

Updated WHO Pain Ladder

⭐ Pregabalin and Gabapentin are first-line agents for many types of neuropathic pain, acting by binding to the α2δ subunit of voltage-gated calcium channels to ↓ neurotransmitter release.

Pain Management in Rehabilitation - Beyond Pills

  • Non-Pharmacological Approaches:
    • Physical Modalities:
      • Heat/Cold Therapy: Superficial pain, muscle spasm.
      • Transcutaneous Electrical Nerve Stimulation (TENS): Gate control theory.
      • Therapeutic Ultrasound: Deep heating, tissue healing.
    • Exercise Therapy: Graded exposure, strengthening, flexibility.
    • Manual Therapy: Mobilization, manipulation.
    • Cognitive Behavioral Therapy (CBT): Addresses pain catastrophizing, coping skills.
    • Mindfulness & Relaxation Techniques.
  • Interventional Techniques (Minimally Invasive):
    • Trigger Point Injections: Myofascial pain.
    • Nerve Blocks: Diagnostic & therapeutic (e.g., facet joint, epidural).
    • Radiofrequency Ablation (RFA): Chronic joint/nerve pain.
    • Spinal Cord Stimulation (SCS): Neuropathic pain.

TENS unit electrode placement for lower back pain

Gate Control Theory of Pain: Proposed by Melzack & Wall (1965), suggests that non-painful input closes the "gates" to painful input, preventing pain sensation from traveling to the CNS. TENS therapy is based on this principle.

  • Multimodal Approach: Combining pharmacological, non-pharmacological, and interventional strategies is often most effective for chronic pain management in rehabilitation.

Pain Management in Rehabilitation - Holistic Help

  • Emphasizes biopsychosocial model for comprehensive care.
  • Multidisciplinary Team (MDT): physiatrist, physiotherapist (PT), occupational therapist (OT), psychologist.
  • Focus: ↑ function, ↓ pain, ↑ Quality of Life (QoL).
  • Key elements: Patient education, realistic goal setting, coping strategies.
  • Psychological support: Cognitive Behavioural Therapy (CBT), mindfulness.

⭐ Addressing psychosocial factors (e.g., fear-avoidance beliefs, catastrophizing) is crucial for successful chronic pain rehabilitation outcomes and functional improvement within the biopsychosocial framework of care.

High‑Yield Points - ⚡ Biggest Takeaways

  • Multimodal analgesia is paramount, integrating drugs (NSAIDs, opioids, adjuvants) and non-pharmacological methods.
  • The WHO analgesic ladder guides stepwise management, especially for cancer pain.
  • Neuropathic pain often requires adjuvant analgesics (e.g., gabapentinoids, TCAs, SNRIs).
  • Non-pharmacological therapies like TENS, exercise, and CBT are crucial.
  • Beware of Opioid-Induced Hyperalgesia (OIH) with long-term opioid use.
  • Prioritize early mobilization and functional restoration in rehabilitation.
  • Patient education on pain mechanisms and coping strategies is vital.

Practice Questions: Pain Management in Rehabilitation

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A patient after undergoing thoracotomy complains of severe pain. The BEST method of pain control in this patient would be:

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Flashcards: Pain Management in Rehabilitation

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Treatment of myositis ossificans in latent phase involves _____

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Treatment of myositis ossificans in latent phase involves _____

active physiotherapy

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