5.3 Pain Management in Rehabilitation
Key Takeaways
- Acute pain is time-limited and protective, chronic pain persists beyond 3 months, and neuropathic pain is described as burning, shooting, or electric and responds poorly to standard analgesics
- Self-report is the most reliable indicator of pain; the FLACC and PAINAD scales assess pain when patients cannot self-report
- The World Health Organization (WHO) analgesic ladder steps from non-opioids to weak then strong opioids, always combined with adjuvants and non-drug measures
- Multimodal analgesia and non-pharmacologic methods such as Transcutaneous Electrical Nerve Stimulation (TENS), heat, cold, and positioning reduce opioid reliance in rehabilitation
- Central post-stroke pain and spasticity-related pain are managed with adjuvants (anticonvulsants, antidepressants, antispastics), not opioid escalation
Pain Is a Rehabilitation Outcome Issue
Uncontrolled pain limits therapy participation, sleep, mood, and function, so the Certified Rehabilitation Registered Nurse (CRRN) treats pain control as a driver of functional gain — not merely comfort. The exam expects you to classify pain correctly, assess it with the right tool, and choose interventions that minimize opioid reliance.
Types of Pain
| Type | Time course | Quality | Typical rehab example |
|---|---|---|---|
| Acute | Days to weeks; protective | Sharp, well localized | Postoperative joint replacement pain |
| Chronic | Persists beyond ~3 months | Variable; often poorly localized | Long-standing low back pain |
| Neuropathic | Often chronic | Burning, shooting, electric, tingling | Spinal cord injury below-level pain, diabetic neuropathy |
| Nociceptive | Acute or chronic | Aching, throbbing | Musculoskeletal or soft-tissue injury |
Neuropathic pain arises from nervous-system damage and responds poorly to standard analgesics and opioids; it is treated with adjuvant agents such as anticonvulsants (e.g., gabapentin, pregabalin) and certain antidepressants. Recognizing the burning/electric descriptor is a frequent exam cue to choose an adjuvant rather than escalate opioids.
Pain Assessment
Patient self-report is the single most reliable indicator of pain and its intensity. The nurse selects a tool matched to the patient's ability:
| Tool | Spelled out | Best for |
|---|---|---|
| NRS | Numeric Rating Scale (0-10) | Verbal adults |
| Wong-Baker FACES | FACES Pain Rating Scale | Children, some cognitive/language limits |
| FLACC | Face, Legs, Activity, Cry, Consolability | Nonverbal patients (behavioral observation) |
| PAINAD | Pain Assessment in Advanced Dementia | Patients with advanced dementia |
Always assess pain multidimensionally: location, onset, quality, intensity, aggravating/relieving factors, and the functional impact (sleep, therapy tolerance, mood). Reassess after every intervention within the medication's expected time to peak effect.
The WHO Analgesic Ladder
The World Health Organization (WHO) analgesic ladder is the framework for stepwise pharmacologic pain control. At every step, adjuvants and non-pharmacologic measures are added.
| Step | Pain level | Typical agents |
|---|---|---|
| Step 1 | Mild | Non-opioids: acetaminophen, NSAIDs (nonsteroidal anti-inflammatory drugs) +/- adjuvants |
| Step 2 | Mild-moderate | Weak opioids (e.g., codeine, tramadol) + non-opioid +/- adjuvants |
| Step 3 | Moderate-severe | Strong opioids (e.g., morphine) + non-opioid +/- adjuvants |
Key rules: dose by the clock for persistent pain rather than only as needed, prefer the least invasive route (oral first), and individualize to the patient and their function.
Multimodal and Non-Pharmacologic Approaches
Multimodal analgesia combines agents and methods with different mechanisms to maximize relief and minimize opioid dose and side effects — central to rehabilitation pain care.
- Transcutaneous Electrical Nerve Stimulation (TENS): low-voltage current for localized musculoskeletal and some neuropathic pain.
- Thermal therapy: heat for muscle spasm and stiffness; cold for acute injury, inflammation, and edema (protect insensate skin, e.g., after spinal cord injury).
- Positioning, pressure relief, and proper body mechanics to prevent pain-generating immobility complications.
- Cognitive-behavioral methods: relaxation, guided imagery, distraction, patient education, and pacing of activity.
- Therapeutic exercise and graded activity to reduce deconditioning-related pain.
Opioid Stewardship
The CRRN balances adequate analgesia against opioid risks:
- Use the lowest effective dose for the shortest necessary duration, with a clear functional goal.
- Anticipate and prevent constipation with a bowel regimen at the start of opioid therapy (especially important in spinal cord injury and immobility).
- Monitor for sedation and respiratory depression; rising sedation precedes respiratory depression.
- Reassess effectiveness on function, not just on a number; avoid reflexive dose escalation for neuropathic or central pain.
- Screen for misuse risk, educate on safe storage and disposal, and coordinate tapering plans with the team.
Central and Spasticity-Related Pain
- Central post-stroke pain (CPSP) and central pain after spinal cord injury are neuropathic; they are managed with adjuvants (anticonvulsants, certain antidepressants) rather than opioid escalation.
- Spasticity-related pain is treated by managing the spasticity itself: stretching and range of motion, proper positioning and splinting, removing noxious triggers (full bladder, pressure injury, infection), antispastic medications (e.g., baclofen, including intrathecal baclofen for severe cases), and focal botulinum toxin injections.
- Always check for a reversible noxious stimulus before escalating drugs — in spinal cord injury at T6 and above, untreated noxious input can also precipitate autonomic dysreflexia, a medical emergency.
Adjuvant Agents and Special Populations
Adjuvant analgesics treat pain through non-opioid mechanisms and are first-line for neuropathic pain: anticonvulsants (gabapentin, pregabalin), tricyclic and SNRI antidepressants (amitriptyline, duloxetine), muscle relaxants/antispasmodics for spasticity-related pain, and topical agents (lidocaine, capsaicin). In older adults, start low and go slow, prefer scheduled acetaminophen, use NSAIDs cautiously (renal, GI, cardiovascular risk), and watch for anticholinergic and sedating effects that increase fall and delirium risk.
In patients with a history of substance use, pain is still treated — under-treatment is not a safe substitute — but with a structured plan, monitoring, and behavioral-health coordination.
Phantom Limb and Complex Regional Pain
Two rehabilitation-specific pain syndromes appear on the exam. Phantom limb pain after amputation is neuropathic; the nurse validates that the pain is real (not imagined), uses adjuvants, and supports modalities such as mirror therapy, desensitization, and TENS. Complex regional pain syndrome (CRPS) produces disproportionate burning pain with swelling, skin and temperature changes, and hypersensitivity in a limb; early mobilization and desensitization are key, and immobilizing the limb to "protect" it tends to worsen it — a common distractor.
A patient with a spinal cord injury reports constant burning and electric, shooting pain in the legs that has not improved with scheduled opioids. Which intervention best reflects evidence-based rehabilitation pain management?
Which statement about pain assessment is most accurate for the CRRN nurse?
According to the WHO analgesic ladder, which sequence correctly orders pharmacologic management from the lowest to the highest pain intensity?
An opioid-naive rehabilitation patient with a spinal cord injury is started on scheduled oral opioids for acute postoperative pain. Which nursing action has the highest priority for preventing a common, predictable complication?