📋 Key Information Summary
- Pain in the last days of life (typically the final 48–72 hours) requires anticipatory prescribing and rapid titration, as patients are often unable to self-report.
- Nonverbal pain assessment is essential — use validated tools such as the Abbey Pain Scale or FLACC scale; observe for grimacing, guarding, moaning, restlessness, and physiological signs (tachycardia, hypertension).
- There is no maximum dose of morphine — titrate to effect, increasing by 30–50% of the current dose every 24 hours if pain persists, with more frequent adjustments in the last days.
- Subcutaneous (SC) infusion is the preferred route when oral intake is no longer possible; convert the current 24-hour oral morphine dose to SC using a ratio of 1:2 (oral:SC) or 1:3 depending on local guidelines.
- If opioid-naïve, start morphine SC 2.5–5 mg with 2.5–5 mg available as needed every 1–2 hours via syringe driver (over 24 hours) plus PRN boluses equivalent to 1/6th to 1/10th of the total 24-hour dose.
- Existing opioid therapy should be continued — convert the current 24-hour opioid dose to SC morphine equivalent; do not abruptly stop transdermal fentanyl patches (they provide residual analgesia for 12–24 hours after removal).
- Breakthrough (rescue) doses should be prescribed as PRN SC boluses at 1/6th to 1/10th of the total 24-hour opioid dose, available every 1–2 hours.
- Adjuvant analgesics — consider dexamethasone for bone metastases or raised intracranial pressure, and midazolam for muscle spasm or anticipatory distress alongside morphine.
- Anticipatory prescribing of subcutaneous medications (opioid, antiemetic, sedative) into the home or bedside is best practice and recommended by Palliative Care Australia.
- Renal impairment is common at end of life — morphine-6-glucuronide accumulates; consider hydromorphone or fentanyl in significant renal failure (eGFR <15 mL/min).
- Ethical principle: the doctrine of double effect protects clinicians who titrate opioids to relieve pain even if respiratory depression is a foreseeable consequence — intent to relieve suffering is paramount.
- Non-pharmacological strategies remain important: positioning, gentle massage, music therapy, and caregiver presence reduce distress at end of life.
- ATSI patients may have cultural and spiritual dimensions to pain; involve family, Aboriginal health practitioners, and culturally appropriate palliative care services early.
Introduction & Australian Epidemiology
Pain management in the last days of life is a critical component of end-of-life care. During this period — typically defined as the final 48–72 hours before death — patients may lose the ability to communicate verbally, swallow medications, or participate actively in their own care. The transition from oral to parenteral analgesia, combined with vigilant nonverbal pain assessment, is essential to ensure comfort and dignity.
In Australia, approximately 160,000 people die each year, with around 70% of deaths occurring in hospital or residential aged-care settings (AIHW 2023). Palliative Care Australia estimates that 50–70% of patients experience pain in the final weeks of life, and undertreated pain remains one of the most common concerns reported by families and carers. The National Palliative Care Strategy (2018) emphasises that all Australians should have access to high-quality palliative care regardless of location, including those dying in regional and remote areas.
This article focuses specifically on the pharmacological and non-pharmacological management of pain when patients are no longer able to swallow or communicate reliably. It covers nonverbal assessment techniques, morphine infusion regimens, conversion from existing opioids, and management of breakthrough pain. All recommendations are consistent with the Palliative Care Therapeutic Guidelines and the Australian and New Zealand Society of Palliative Medicine (ANZSPM) consensus statements.
Nonverbal Pain Assessment
As patients approach the final days of life, verbal self-report of pain becomes unreliable or impossible. Clinicians must rely on validated nonverbal assessment tools and systematic observational skills. Failure to detect pain in nonverbal patients is a significant source of undertreated suffering and is a key quality indicator in palliative care.
Behavioural and Physiological Indicators of Pain
- Facial expression: grimacing, frowning, clenched teeth, furrowed brow, tearing
- Body movements: guarding, bracing, rigidity, restless agitation, withdrawal from stimulus
- Vocalisation: moaning, groaning, crying, sighing, calling out
- Physiological signs: tachycardia, hypertension, diaphoresis, tachypnoea (note: these may be absent in the actively dying)
- Changes in behaviour: new-onset confusion or agitation, social withdrawal, resistance to care, altered sleep patterns
Validated Nonverbal Pain Assessment Tools
| Tool | Population | Components | Scoring |
|---|---|---|---|
| Abbey Pain Scale | Adults unable to self-report (end of life, dementia) | Vocalisation, facial expression, body language, behavioural change, physiological change, bodily change | 0–2 = no pain; 3–7 = mild; 8–13 = moderate; 14+ = severe |
| FLACC Scale | Children; adults with cognitive impairment | Face, Legs, Activity, Cry, Consolability | 0 = relaxed; 1–3 = mild; 4–6 = moderate; 7–10 = severe |
| PAINAD | Patients with dementia | Breathing, negative vocalisation, facial expression, body language, consolability | 0–10 scale |
| Critical-Care Pain Observation Tool (CPOT) | Critically ill intubated adults | Facial expression, body movements, muscle tension, compliance with ventilator | 0–8; ≥3 suggests pain |
| Comfort-B Scale | Neonates and infants | Alertness, calmness, respiratory response, movement, muscle tone, facial tension, blood pressure, heart rate | 6–30; higher = more distress |
Differentiating Pain from Other Causes of Distress
Not all agitation or restlessness in the last days of life is due to pain. Differential causes include:
- Delirium — fluctuating consciousness, disorientation, hallucinations (consider haloperidol 0.5–1 mg SC)
- Urinary retention — palpable bladder, restlessness (catheterise if confirmed)
- Constipation/faecal impaction — abdominal distension (consider rectal examination; microenema or manual evacuation if appropriate)
- Dyspnoea — air hunger, nasal flaring, accessory muscle use (low-dose morphine 2.5–5 mg SC and/or midazolam 2.5–5 mg SC)
- Spiritual or existential distress — may require pastoral care or psychosocial support
Morphine Regimens in the Last Days of Life
Subcutaneous morphine delivered via continuous syringe driver (e.g., CADD-MS 3 or equivalent) is the standard approach for opioid delivery in the last days of life when the oral route is no longer feasible. The syringe driver runs over 24 hours and is supplemented by PRN breakthrough doses.
Starting Morphine — Opioid-Naïve Patients
For patients not previously receiving opioids, the initial subcutaneous regimen should be conservative with rapid titration based on clinical response.
Titration Protocol
Common Co-Infusions in the Syringe Driver
| Medication | Indication | Typical SC dose / 24 hours | Compatibility with morphine |
|---|---|---|---|
| Metoclopramide | Nausea, vomiting, gastroparesis | 30–60 mg | Compatible in same syringe |
| Haloperidol | Nausea, delirium, agitation | 2.5–5 mg (up to 10 mg for delirium) | Compatible |
| Midazolam | Anxiety, seizures, refractory dyspnoea | 10–30 mg (up to 60 mg for refractory agitation) | Compatible |
| Hyoscine butylbromide | Secretions, colic | 60–120 mg | Compatible |
| Dexamethasone | Bone pain, raised ICP, nausea from obstruction | 8–16 mg | Separate syringe recommended (pH incompatibility) |
| Levomepromazine | Refractory nausea, sedation | 25–50 mg | Separate syringe recommended |
Managing Patients on Existing Opioid Therapy
Many patients approaching the last days of life will already be receiving regular opioid therapy. The key principle is continuity — do not abruptly stop existing opioids. Convert the current 24-hour opioid dose to an equivalent subcutaneous morphine regimen.
Oral-to-Subcutaneous Morphine Conversion
| Current Route | Conversion Ratio (Oral:SC) | Method |
|---|---|---|
| Oral morphine → SC morphine | 2:1 (i.e., divide total 24-hour oral dose by 2) | Total oral morphine in 24 hours ÷ 2 = SC morphine over 24 hours |
| Oral oxycodone → SC morphine | Oral oxycodone × 1.5 = oral morphine equivalent, then ÷ 2 | Use 1:1.5 ratio for oxycodone:morphine (oral), then convert to SC |
| Transdermal fentanyl patch → SC morphine | See Fentanyl Patch Conversion table below | Remove patch; start SC morphine 12 hours after patch removal |
| Oral hydromorphone → SC morphine | Oral hydromorphone × 5 = oral morphine equivalent, then ÷ 2 | Hydromorphone is approximately 5× more potent than morphine (oral) |
Fentanyl Patch Conversion
| Fentanyl Patch (mcg/hr) | Approximate 24-Hour Oral Morphine Equivalent | Equivalent SC Morphine / 24 hours |
|---|---|---|
| 12 mcg/hr | 30 mg | 15 mg |
| 25 mcg/hr | 60 mg | 30 mg |
| 50 mcg/hr | 120 mg | 60 mg |
| 75 mcg/hr | 180 mg | 90 mg |
| 100 mcg/hr | 240 mg | 120 mg |
Buprenorphine Patch Conversion
Buprenorphine patches (Norspan®) are less commonly used in the last days of life due to complex pharmacokinetics and ceiling effects. Conversion is as follows:
- Norspan 5 mcg/hr ≈ 12 mg oral morphine / 24 hours ≈ 6 mg SC morphine / 24 hours
- Norspan 10 mcg/hr ≈ 24 mg oral morphine / 24 hours ≈ 12 mg SC morphine / 24 hours
- Norspan 20 mcg/hr ≈ 48 mg oral morphine / 24 hours ≈ 24 mg SC morphine / 24 hours
- Remove the patch and allow a washout period of 12–24 hours before starting SC morphine; use PRN SC morphine 2.5–5 mg during the transition if needed
Methadone Conversion
Breakthrough Pain Management
Breakthrough pain — a transient exacerbation of pain occurring against a background of otherwise controlled baseline pain — is common in the last days of life and may be triggered by repositioning, wound care, or bladder/bowel distension. Rapid-onset rescue analgesia is essential.
Principles of Breakthrough Dose Calculation
- The breakthrough (rescue) dose = 1/6th of the total 24-hour opioid dose
- This dose is available every 1–2 hours as needed via subcutaneous injection
- If ≥2 breakthrough doses are required in 24 hours, the regular (syringe driver) dose should be increased
- In the last days of life, the breakthrough dose may need to be increased to 1/4 or 1/3 of the 24-hour dose if pain is severe and rapidly escalating
| Syringe Driver Dose (24 hours) | Breakthrough Dose (1/6th) | Frequency |
|---|---|---|
| 5 mg morphine SC/24h | 1 mg morphine SC (round to 1–2.5 mg) | Every 1–2 hours PRN |
| 10 mg morphine SC/24h | 2 mg morphine SC (round to 2–2.5 mg) | Every 1–2 hours PRN |
| 20 mg morphine SC/24h | 3–4 mg morphine SC | Every 1–2 hours PRN |
| 50 mg morphine SC/24h | 8–10 mg morphine SC | Every 1–2 hours PRN |
| 100 mg morphine SC/24h | 15–20 mg morphine SC | Every 1–2 hours PRN |
Procedural Pain at End of Life
Brief painful procedures (wound care, catheterisation, repositioning) may require pre-emptive or co-analgesia:
- Pre-procedure: Administer the breakthrough dose 20–30 minutes before the procedure
- Severe procedural pain: Consider midazolam 2.5–5 mg SC in addition to the opioid breakthrough dose for anxiolysis and muscle relaxation
- Wound care: Topical lidocaine 4% (Emla® cream) to the wound 30 minutes prior may reduce opioid requirements
When Breakthrough Pain Is Refractory
- Dexamethasone 8–16 mg IV/SC daily for bone metastases, nerve compression, or raised ICP
- Ketamine (specialist supervision only) — SC 50–100 mg/24 hours via syringe driver as a third-line adjuvant for neuropathic or opioid-resistant pain
- Lidocaine IV infusion 1–2 mg/min (ICU/HDU setting only) for refractory neuropathic pain
Subcutaneous Administration Techniques
In the last days of life, the subcutaneous route is preferred over intramuscular (less painful, easier for carers). Key points:
- Butterfly needle: 23–25 gauge, inserted into the subcutaneous tissue of the anterior thigh, upper arm, or anterior abdominal wall; change site every 3–7 days or if signs of inflammation
- Maximum volume per SC bolus: 2 mL (ideally ≤1 mL to avoid tissue irritation)
- Syringe driver rate: Most drivers deliver at a constant rate over 24 hours (e.g., 1 mL/24h); ensure the medication is soluble at the required concentration
- Patient-controlled analgesia (PCA): May be considered in palliative care units for patients who can press the button; otherwise, carer- or nurse-administered PRN doses are standard
Adjuvant Analgesics and Non-Pharmacological Strategies
Adjuvant Analgesics
Non-Pharmacological Strategies
- Positioning: Reposition every 2–4 hours; use pressure-relieving mattresses; elevate head of bed to 30° for respiratory comfort
- Gentle massage: Light touch massage to limbs and back reduces anxiety and may modulate pain perception
- Music therapy: Evidence supports music therapy for reducing pain and anxiety in palliative care (Hole et al. 2015)
- Thermal therapy: Warm compresses for musculoskeletal pain; cool cloths for headache
- Presence and reassurance: Family presence, holding hands, calm narration of care activities reduces distress
- Environmental modifications: Reduce noise, dim lighting, maintain comfortable temperature
Special Populations
Renal Impairment
Hepatic Impairment
Elderly Patients
Paediatric Patients
Immunocompromised Patients
Aboriginal and Torres Strait Islander peoples experience a disproportionate burden of chronic disease and cancer, yet access to palliative care services remains significantly lower than for non-Indigenous Australians. The AIHW reports that Indigenous Australians are 1.5 times more likely to die from cancer and often present at more advanced stages. Cultural safety, family-centred care, and connection to Country are essential components of end-of-life care for many Indigenous Australians.
📚 References
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