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Medical Knowledge 3% exam weight

Pain Assessment and Management

Part of the DOH (UAE) study roadmap. Medical Knowledge topic medica-012 of Medical Knowledge.

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Pain Assessment and Management

Pain is one of the most common reasons patients seek healthcare, and adequate pain management is both a fundamental patient right and a core nursing responsibility in UAE healthcare facilities. The DOH (UAE) examination tests your understanding of pain mechanisms, assessment tools, and the pharmacological and non-pharmacological management of pain. In the UAE, cultural diversity means nurses must be skilled in assessing pain across different cultural backgrounds and in patients with communication barriers.

🟢 Lite — Quick Review (1h–1d)

Rapid summary for last-minute revision before your exam.

Pain Classifications:

TypeMechanismExamples
NociceptiveTissue damage activates pain receptorsSurgical wound, fracture, burn, visceral organ distension
NeuropathicDamage to somatosensory nervous systemDiabetic neuropathy, post-herpetic neuralgia, phantom limb pain
Acute< 3 months; direct tissue injuryPost-operative, trauma, MI
Chronic> 3 months; persists beyond healingCancer pain, chronic low back pain, fibromyalgia

WHO Analgesic Ladder (still clinically useful framework):

  1. Step 1: Non-opioid (paracetamol, NSAIDs) ± adjuvant
  2. Step 2: Weak opioid (codeine, tramadol) ± non-opioid ± adjuvant
  3. Step 3: Strong opioid (morphine, fentanyl, methadone) ± non-opioid ± adjuvant

Pain Assessment — Use a Validated Tool:

  • Numeric rating scale (NRS): 0 (no pain) to 10 (worst imaginable)
  • Verbal descriptor scale: None, mild, moderate, severe
  • Faces Pain Scale: Especially useful for children and patients with language barriers
  • Abbey scale: For patients with cognitive impairment

⚡ Exam Tip: Pain is subjective — always believe the patient’s self-report. A patient’s pain rating is the gold standard of assessment. Never assume a patient is not in pain because they are not visibly distressed, and never assume pain intensity from vital signs alone (tachycardia and hypertension can have many causes).

🟡 Standard — Regular Study (2d–2mo)

Standard content for students with a few days to months.

1. Opioid Analgesics

Morphine:

  • Gold standard opioid for moderate-to-severe pain
  • Routes: IV (most common in hospital), SC, IM, oral (IR and MR)
  • Doses: IR oral 10–20 mg q4h PRN; IV 2.5–5 mg q4h PRN
  • Side effects: Respiratory depression (monitor RR; <8/min = withhold and notify physician), constipation (mandatory laxatives), nausea/vomiting (antiemetics), sedation, urinary retention, pruritus (antihistamines), hypotension

Fentanyl:

  • 100× more potent than morphine
  • Transdermal patches: 25–100 mcg/hr (for chronic cancer pain; not for opioid-naive patients)
  • IV fentanyl: For acute pain, procedural sedation
  • Rapid onset; short duration

Codeine and Tramadol:

  • “Weak opioids” — for mild-to-moderate pain
  • Codeine: Prodrug (requires CYP2D6 to convert to morphine); ~10% of patients are poor metabolisers (reduced effect); others are ultra-rapid metabolisers (risk of toxicity)
  • Tramadol: Dual mechanism (opioid + SNRI); lowers seizure threshold; serotonin syndrome risk

2. Non-Opioid Analgesics

Paracetamol (Acetaminophen):

  • Mechanism: Central COX inhibition; antipyretic; analgesic
  • Maximum dose: 4 g/day (75 mg/kg/day for adults)
  • Overdose: Hepatotoxicity — N-acetylcysteine (NAC) is the antidote
  • Very safe when used within therapeutic range; no GI, renal, or cardiac risks
  • In UAE: Available OTC; patients may take more than they realise

NSAIDs (Ibuprofen, Diclofenac, Naproxen):

  • Mechanism: COX-1 and COX-2 inhibition → ↓ prostaglandins
  • Benefits: Anti-inflammatory, analgesic, antipyretic
  • Side effects: GI bleeding (take with food), renal impairment, cardiovascular events (higher risk with diclofenac and rofecoxib), bleeding risk
  • CI: Active peptic ulcer, severe renal impairment, perioperative pain in CABG, third trimester pregnancy
  • Celecoxib (COX-2 selective): Lower GI risk; still has CV risk

Adjuvant Analgesics:

  • Gabapentin/Pregabalin: For neuropathic pain (diabetic neuropathy, post-herpetic neuralgia)
  • Tricyclic antidepressants (amitriptyline): Neuropathic pain, chronic pain syndromes
  • Corticosteroids: For cancer-related bone pain, nerve compression

3. Non-Pharmacological Pain Management

  • Ice and heat therapy
  • Relaxation techniques and guided imagery
  • Distraction (music therapy, TV, conversation)
  • Massage and positioning
  • TENS (transcutaneous electrical nerve stimulation)
  • Cognitive behavioural therapy (CBT)
  • Acupuncture (used in some UAE hospitals as complementary therapy)

🔴 Extended — Deep Study (3m+)

Comprehensive coverage for students on a longer study timeline.

4. Special Pain Populations

Elderly Patients:

  • Report pain less spontaneously; may use different descriptors
  • More susceptible to opioid side effects (sedation, respiratory depression, constipation)
  • Start low, go slow — lower starting doses and longer dosing intervals
  • Paracetamol is first-line; NSAIDs should be used with extreme caution

Patients with Communication Barriers:

  • Use visual scales, Behavioural Pain Scale (BPS) for intubated patients
  • Non-verbal pain cues: Facial expression, body movements, muscle tension, vocalisation
  • Assess function (ability to cough, move, sleep) as proxy for pain

Cancer Pain:

  • Often a combination of nociceptive and neuropathic components
  • Breakthrough pain (transient flares on baseline controlled pain) — treat with IR opioid bolus
  • Mucositis pain (chemotherapy/radiation) — topical lidocaine, morphine mouthwash

5. Patient-Controlled Analgesia (PCA)

  • Patient self-administers small doses of opioid via pump within prescribed parameters
  • Parameters set by physician: Demand dose, lockout interval, background infusion (optional)
  • Advantages: Better pain control, patient autonomy, lower total dose
  • Requires patient to be conscious and able to understand the device
  • Monitor: Pain scores, sedation level, respiratory rate, SpO₂

Exam Watch: A patient on IV morphine who becomes increasingly drowsy and has a respiratory rate of 6/min has opioid toxicity. The nurse must immediately stop the morphine, administer oxygen, establish IV access, and administer naloxone (opioid antagonist) — titrated in small doses until the patient is adequately respiratory. This is a medical emergency.

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