Pain Assessment and Management

Understanding Pain - The Palliative Puzzle

• Pain: Unpleasant sensory & emotional experience linked to actual/potential tissue damage (WHO).
• Total Pain (Cicely Saunders): Physical, psychological, social, spiritual dimensions. Holistic approach vital.
• Types & Characteristics:
  • Nociceptive:
    • Somatic: Localized, aching, throbbing (e.g., bone mets).
    • Visceral: Diffuse, cramping, gnawing (e.g., organ distension).
  • Neuropathic: Nerve injury; burning, shooting, tingling, "pins & needles".
• Assessment: Self-report is gold standard 💡. Use scales (NRS, VAS, Faces Pain Scale).

⭐ "Total Pain" (Saunders): physical, psychological, social, spiritual dimensions; crucial for holistic palliative care.

Assessing Agony - Detective Work

• Core Principle: Pain is subjective; patient's report is key.
• Systematic Assessment:
  • History: Patient's words. 📌 SOCRATES: Site, Onset, Character, Radiation, Assoc. symptoms, Timing, Exacerb/Relief, Severity.
  • Impact: On daily activities, sleep, mood.
  • Physical Exam: Source, tenderness, neuro signs.
• Pain Scales:
  • NRS (Numeric Rating Scale): 0-10.
  • VAS (Visual Analog Scale): 100mm line.
  • Wong-Baker FACES: Children ≥3 yrs, cognitive/verbal impair.
  • VDS (Verbal Descriptor Scale): Mild, moderate, severe.
  • BPS/CPOT (Behavioral Pain Scale/Critical-Care Pain Observation Tool): Non-verbal/ICU.

⭐ Wong-Baker FACES Scale: validated for children ≥3 yrs; preferred if unable to use numeric scales.

The Analgesic Arsenal - Step by Step

• WHO Ladder Principles: 📌 By Mouth, By Clock, By Ladder, Individualized Dosing.
• Non-Opioids (Step 1):
  • Paracetamol: Max 4g/day (adults).
  • NSAIDs (e.g., Ibuprofen, Diclofenac): GI & renal risk. COX-2 inhibitors (Etoricoxib) safer for GI.
• Weak Opioids (Step 2):
  • Tramadol: 50-100mg q4-6h (max 400mg/day). Seizure risk.
  • Codeine: Often with paracetamol. Constipation.
• Strong Opioids (Step 3):
  • Morphine (oral): Start 5-10mg q4h for opioid-naive.
  • Fentanyl (patch): For stable, chronic pain. Not for acute pain or opioid-naive.
• Adjuvant Analgesics (All Steps):
  • Neuropathic pain: Gabapentin, Pregabalin, Amitriptyline.
  • Bone pain: Corticosteroids (Dexamethasone), Bisphosphonates.

⭐ Morphine is the gold standard and first-line strong opioid for moderate to severe cancer pain management according to WHO guidelines; initiate with immediate-release oral morphine.

Opioid Power - Taming the Beast

• Principle: WHO Ladder Step 2 (weak) & 3 (strong) for moderate-severe pain.
  • Weak: Tramadol, Codeine.
  • Strong: Morphine (Gold Standard), Fentanyl, Methadone, Oxycodone.
• Titration: "Start Low, Go Slow".
  • Breakthrough Pain (BTP): Rescue dose 10-15% of 24-hr total, q1-4h PRN.
• Opioid Rotation: For poor efficacy or intolerable side effects.
  • Use equianalgesic doses; reduce new opioid by 25-50% (incomplete cross-tolerance).
• Key Side Effects & Management:
  • Constipation: Universal. Prophylactic laxatives (stimulant + softener).
  • Nausea/Vomiting: Common. Antiemetics (Metoclopramide).
  • Sedation: Usually transient.
  • Respiratory Depression: Rare. Antidote: Naloxone (0.4mg IV/IM).
  • 📌 Mnemonic (Common): Constipation, Nausea, Sedation (CNS).
• Important Notes:
  • Fentanyl patch: For stable pain, not opioid-naïve. Change q72h.
  • Methadone: Long half-life, good for neuropathic pain. Careful initiation.

⭐ Oral morphine is the first-line strong opioid for cancer pain management as per WHO guidelines, valued for its efficacy and multiple administration routes.

High‑Yield Points - ⚡ Biggest Takeaways

• Pain assessment is key; use scales like NRS or VAS.
• The WHO analgesic ladder guides stepwise management, starting with non-opioids.
• Morphine is the gold standard strong opioid; titrate dose carefully.
• Proactively manage opioid side effects: constipation (laxatives), nausea (antiemetics).
• Use adjuvant analgesics like gabapentin for neuropathic pain or NSAIDs.
• Address breakthrough pain with short-acting opioids.
• Recognize total pain: physical, psychological, social, spiritual aspects_._