📋 Key Information Summary
- Palliative care should be introduced early in Parkinson disease (PD) and integrated alongside disease-modifying and symptomatic therapy — not reserved for end of life alone.
- Motor fluctuations (wearing-off, on–off phenomena, freezing) worsen in advanced PD and require individualised levodopa dose adjustment, extended-release formulations, and adjunctive agents (MAO-B inhibitors, COMT inhibitors, dopamine agonists).
- Non-motor symptoms — pain, autonomic dysfunction, sleep disturbance, hallucinations, depression, and cognitive decline — often cause greater distress than motor symptoms and must be systematically screened.
- Dysphagia affects up to 80% of advanced PD patients, raising aspiration pneumonia risk; speech–language pathology assessment and texture-modified diet are essential.
- Medication continuity is critical: abrupt withdrawal of dopaminergic agents can precipitate neuroleptic malignant-like syndrome (NMS-LS) or akinetic crisis — a medical emergency.
- Antipsychotic use in PD dementia must be restricted to quetiapine or clozapine; haloperidol and risperidone are contraindicated due to worsening parkinsonism.
- Subcutaneous (subcut) apomorphine, rotigotine transdermal patches, and levodopa–carbidopa intestinal gel (LCIG / Duodopa®) are key options when oral medication fails.
- Advanced care planning, including resuscitation wishes, feeding preferences, and place-of-death preferences, should be documented early and reviewed regularly.
- Multidisciplinary team input — neurology, palliative medicine, speech pathology, occupational therapy, physiotherapy, dietetics, social work, and specialist PD nurses — is essential.
- Aboriginal and Torres Strait Islander peoples face barriers to palliative care access; culturally safe, community-based models improve outcomes.
- Neuroleptic malignant-like syndrome (NMS-LS) from abrupt PD medication cessation presents with rigidity, hyperthermia, autonomic instability, and altered consciousness — treat as a medical emergency with dantrolene or bromocriptine and reinstate dopaminergic therapy.
- Depression and anxiety affect 40–50% of advanced PD patients; SSRIs (sertraline, citalopram) and SNRIs (venlafaxine) are first-line, with caution regarding serotonin syndrome with MAO-B inhibitors.
Introduction & Australian Epidemiology
Parkinson disease (PD) is a progressive neurodegenerative disorder characterised by the loss of dopaminergic neurons in the substantia nigra pars compacta and the accumulation of alpha-synuclein-containing Lewy bodies. While traditionally managed by neurologists focusing on motor symptom control, the palliative care needs of people with advanced PD are increasingly recognised as complex, multidimensional, and deserving of early integrated palliative care.
Palliative care in PD is not synonymous with end-of-life care. International and Australian guidelines recommend that palliative care principles — symptom management, quality of life, psychosocial support, and advance care planning — be introduced from the time of diagnosis and intensified as the disease progresses through Hoehn and Yahr stages IV and V.
Australian Burden of Disease
- An estimated 80,000–100,000 Australians live with PD, with approximately 30–40% having advanced disease requiring complex palliative symptom management.
- PD prevalence increases sharply after age 65; the median age at diagnosis is 65 years, and median survival from diagnosis is 10–15 years.
- The AIHW reports PD as the second most common neurodegenerative condition after dementia, with significant hospital and residential aged-care burden.
- Caregiver burden is substantial: up to 60% of primary carers report clinically significant depression and burnout.
- Aboriginal and Torres Strait Islander peoples experience barriers to neurology and palliative care services, particularly in remote and very remote areas of Australia.
Motor Fluctuations
Motor fluctuations are among the most disabling features of advanced PD and a major driver of palliative care referral. They result from progressive dopaminergic neuronal loss, narrowing of the therapeutic window for levodopa, and altered pharmacokinetics. Effective management requires a structured approach combining pharmacological adjustment, allied health input, and patient/carer education.
Types of Motor Fluctuations
| Type | Description | Timing | Management Strategy |
|---|---|---|---|
| Wearing-off | Return of symptoms before next scheduled dose | Predictable, dose-related | Reduce dose interval, add COMT or MAO-B inhibitor |
| On–off phenomena | Unpredictable switches between mobile ("on") and immobile ("off") states | Unpredictable | Continuous dopaminergic stimulation (apomorphine, LCIG) |
| Peak-dose dyskinesia | Involuntary choreiform movements at peak levodopa effect | Related to levodopa peak | Reduce single levodopa dose, add amantadine |
| Freezing of gait (FOG) | Sudden inability to initiate or continue walking | Often "off"-related; may occur "on" | Cueing strategies, physiotherapy, adjust medication timing |
| Early morning akinesia | Inability to move on waking before first levodopa dose | Early morning | Extended-release levodopa (e.g., Sinemet CR®) at night; dispersible levodopa on waking |
Pharmacological Management of Motor Fluctuations
Advanced Therapies for Refractory Motor Fluctuations
Freezing of Gait — Non-Pharmacological Strategies
- Auditory cueing: rhythmic auditory stimuli (metronome, music) to initiate stepping.
- Visual cueing: laser-line walking sticks, floor markings, or transverse lines on floor.
- Attentional strategies: counting, stepping sideways, marching in place.
- Physiotherapy: cueing-based gait training, balance exercises, and falls prevention programmes.
Non-Motor Symptoms
Non-motor symptoms (NMS) in PD are ubiquitous and often more distressing to patients and carers than motor features. In advanced disease, NMS dominate the clinical picture and are the primary driver of reduced quality of life, nursing home placement, and carer distress. Systematic screening using validated tools such as the Non-Motor Symptoms Scale (NMSS) or the MDS-NMS is recommended.
Key Non-Motor Symptom Domains in Advanced PD
Pain in Advanced PD
Pain affects 40–85% of PD patients and is multifactorial: musculoskeletal (rigidity, dystonia), central/neuropathic, akathitic, and related to "off" periods. Approach:
Depression and Anxiety
Sleep Disturbance
- REM sleep behaviour disorder (RBD): Dream enactment, risk of injury to patient and bed-partner. Clonazepam 0.5–2 mg PO nocte (most effective) or melatonin 3–12 mg PO nocte. Safety measures: padding bed edges, removing firearms/sharp objects, bed-partner safety education.
- Insomnia: Optimise dopaminergic therapy for nocturnal akinesia. Consider levodopa CR at bedtime or rotigotine patch. Avoid benzodiazepines long-term in cognitively impaired patients.
- Excessive daytime somnolence (EDS): Assess for dopaminergic over-stimulation, sleep apnoea, and depression. Modafinil 100–200 mg PO mane may be trialled (limited evidence).
Autonomic Dysfunction Beyond Orthostasis
| Symptom | Prevalence | Management |
|---|---|---|
| Constipation | 60–80% | High-fibre diet, adequate fluids, macrogol 3350 (Movicol®) 1–3 sachets daily. Avoid bulk-forming agents if dysphagia. Prucalopride 2 mg PO daily for refractory constipation. |
| Urinary urgency/frequency | 30–70% | Mirabegron 50 mg PO daily (preferred — less CNS penetration than oxybutynin). If anticholinergic needed: solifenacin 5 mg PO daily (caution in PDD). |
| Sialorrhoea | 30–50% | Glycopyrrolate 1 mg PO BD–TDS, sublingual atropine 1% drops (1–2 drops sublingually PRN), botulinum toxin injections to parotid/submandibular glands, or referral for radiotherapy in refractory cases. |
| Gastroparesis | 70–100% | Domperidone 10 mg PO TDS (before meals) — does not cross BBB. Avoid metoclopramide (dopamine antagonist — worsens parkinsonism). Small frequent meals. Assess impact on levodopa absorption. |
Dysphagia
Dysphagia affects up to 80% of people with advanced PD and is a major contributor to aspiration pneumonia, malnutrition, and mortality. Oropharyngeal dysphagia in PD is characterised by delayed swallowing initiation, reduced lingual control, pharyngeal residue, and upper oesophageal sphincter dysfunction. Silent aspiration is common — patients may not exhibit overt choking.
Assessment
- Bedside swallow assessment: Speech–language pathology (SLP) evaluation including water swallow test, texture tolerance assessment, and observation of meal.
- Instrumental assessment: Videofluoroscopic swallowing study (VFSS) or fibreoptic endoscopic evaluation of swallowing (FEES) to objectively characterise aspiration pattern and guide texture modification.
- Nutritional status: Dietitian assessment, body weight monitoring, Mini Nutritional Assessment (MNA), and serum albumin/pre-albumin.
- MBS item: Speech pathology services under MBS items 10960, 10962 (Chronic Disease Management plan) or public hospital outpatient SLP.
Management Strategies
Percutaneous Endoscopic Gastrostomy (PEG) Considerations in Palliative PD
Medication Continuity
Medication continuity is a critical safety consideration in advanced PD. Abrupt withdrawal or significant dose reduction of dopaminergic agents — including levodopa, dopamine agonists, MAO-B inhibitors, and amantadine — can precipitate a neuroleptic malignant-like syndrome (NMS-LS) or akinetic crisis. This is a life-threatening medical emergency.
Common Scenarios Threatening Medication Continuity
| Scenario | Risk | Mitigation Strategy |
|---|---|---|
| Hospital admission (nil by mouth) | PD medications omitted or delayed during fasting for procedures, ICU admission, or perioperative periods | Ensure PD medications are continued via NG/PEG when nil by mouth. Liaise with neurology early. Medication charts must include specific timing (e.g., "100/25 mg levodopa every 3 hours 0600–2200"). Never substitute antipsychotics for confusion. |
| Dysphagia — medication unable to be swallowed | Missed doses if no alternative formulation | Use dispersible levodopa (dissolve in water, give via NG tube). Rotigotine transdermal patch bypasses swallowing. Rivastigmine transdermal patch (Exelon Patch®). SC apomorphine as rescue or continuous infusion. |
| Antipsychotic prescribed for agitation | Typical antipsychotics (haloperidol, droperidol) and atypical agents (risperidone, olanzapine) worsen parkinsonism | Only quetiapine 12.5–50 mg or clozapine are safe. EDUCATE emergency and inpatient teams. Place medication alerts on patient's file. Consider MedicAlert bracelet. |
| Anti-emetic prescribing | Metoclopramide and prochlorperazine are dopamine antagonists — worsen parkinsonism | Use domperidone (does not cross BBB), ondansetron, or granisetron for nausea/vomiting. Avoid all centrally-acting anti-emetics. |
| Residential aged care — medication mismanagement | Medication timing errors, substitution errors, or omission during night shifts | Specialist PD nurse liaison with RACF staff. Simplified medication regimen where possible. Clear medication administration instructions in care plan. Consider rotigotine patch to reduce dosing frequency. |
Transdermal and Non-Oral Options for Medication Continuity
End-of-Life Medication Management
In the final days to weeks of life in PD, the goals shift to comfort. However, medication continuity remains paramount even at end of life:
- Continue levodopa via NG/PEG if possible — sudden cessation may cause distressing rigidity and dystonic posturing.
- If continuing oral/enteral levodopa is no longer possible or desired, convert to a transdermal rotigotine patch (if not already on a dopamine agonist) or gradually reduce levodopa over 1–2 weeks.
- Manage secretions with sublingual glycopyrrolate or hyoscine butylbromide SC.
- Anticipate and treat terminal agitation with midazolam SC (2.5–5 mg SC PRN or continuous infusion 0.5–2.5 mg/hr) as per palliative care guidelines.
- Ensure syringe driver compatibility of PD medications if using continuous subcutaneous infusion for symptom control at end of life.
Pathophysiology of Advanced Parkinson Disease
Understanding the neurobiology of PD progression underpins palliative care decision-making and explains why symptoms become increasingly complex and medication-responsive.
Neuropathological Progression
- Stage 1–2 (Braak staging): Alpha-synuclein pathology begins in the olfactory bulb and dorsal motor nucleus of the vagus (causing anosmia, constipation, REM sleep behaviour disorder — prodromal symptoms).
- Stage 3–4: Progression to the substantia nigra pars compacta (motor symptoms emerge), locus coeruleus, raphe nuclei, and amygdala (causing depression, anxiety, sleep disturbance).
- Stage 5–6: Neocortical involvement — frontal, temporal, and parietal cortices (causing dementia, hallucinations, severe autonomic dysfunction). This correlates with advanced PD and palliative care needs.
Pharmacological Basis of Advanced Disease
As striatal dopaminergic neurons degenerate beyond ~80%, the therapeutic window for exogenous levodopa narrows dramatically. Motor fluctuations arise because:
- Reduced presynaptic dopamine storage capacity means response is dependent on continuous exogenous delivery.
- Pulsatile dopamine receptor stimulation (from intermittent oral levodopa) causes downstream receptor sensitisation and dyskinesia.
- Gastric emptying is delayed in PD, causing erratic drug absorption and unpredictable on–off responses.
- Non-dopaminergic systems (serotonergic, noradrenergic, cholinergic) degenerate independently, explaining non-motor symptoms that do not respond to levodopa.
Clinical Presentation & Diagnostic Criteria
Advanced PD — Clinical Features
Advanced PD is characterised by Hoehn and Yahr stage IV–V (bilateral symptoms with postural instability, wheelchair-bound or bed-bound without assistance). The clinical presentation encompasses both motor and non-motor domains:
| Domain | Features |
|---|---|
| Motor | Wearing-off, on–off fluctuations, peak-dose dyskinesia, freezing of gait, festinating gait, postural instability with falls, camptocormia, severe rigidity, dystonia (especially foot dystonia in early morning/off periods) |
| Cognitive | PD dementia (PDD) — attention, executive dysfunction, visuospatial impairment, fluctuating cognition. Must develop ≥1 year after motor onset (otherwise may be dementia with Lewy bodies — DLB) |
| Psychiatric | Visual hallucinations (formed, often benign initially), delusions (paranoid — spouse infidelity, people in house), depression (40–50%), anxiety/panic (often in off states), apathy, impulse control disorders (gambling, hypersexuality — dopamine agonist-related) |
| Autonomic | Orthostatic hypotension, constipation, urinary urgency/incontinence, gastroparesis, erectile dysfunction, sialorrhoea, thermoregulatory failure |
| Swallowing | Oropharyngeal dysphagia, drooling, pharyngeal residue, aspiration (often silent) |
| Sleep | RBD, insomnia, excessive daytime somnolence, nocturia, restless legs |
| Pain | Musculoskeletal, dystonic, central/neuropathic, akathitic — often under-recognised |
Diagnosis of PD Dementia (PDD)
MDS Clinical Diagnostic Criteria for PDD (2007, revised): Core features include diagnosis of PD (MDS criteria) with dementia developing ≥1 year after motor onset. Impairment in ≥2 cognitive domains (attention, executive, visuospatial, memory). Functional impact on daily activities. Key distinction from DLB: motor symptoms precede cognitive decline by ≥1 year.
Investigations
Investigations in advanced PD serve three purposes: confirming disease staging, monitoring treatment-related adverse effects, and excluding reversible causes of symptom deterioration (infection, metabolic derangement, medication effects).
Risk Stratification & Severity Scoring
Palliative care referral and escalation in PD should be guided by clinical staging and symptom burden rather than prognosis alone. The following framework integrates disease stage, symptom burden, and care needs:
Prognostic Indicators in Advanced PD
- Falls with fracture (hip fracture mortality in PD: 30–40% at 1 year).
- Dysphagia with recurrent aspiration pneumonia.
- PD dementia with severe functional dependence.
- Cachexia (BMI <18.5 kg/m²) — associated with ~50% 1-year mortality.
- Institutional placement — median survival from RACF placement in advanced PD is approximately 2–3 years.
- Older age at onset, male sex, and hallucinations independently predict faster progression.
Monitoring
Ongoing monitoring in advanced PD palliative care should be structured to capture motor and non-motor symptom progression, medication adverse effects, and evolving care goals.
Special Populations
Elderly (>80 years)
Renal Impairment
Hepatic Impairment
Young-Onset PD (<50 years)
Cognitively Impaired / PD Dementia
Aboriginal and Torres Strait Islander peoples face significant barriers to accessing palliative care and neurology services. Culturally safe, community-based models of care are essential to improve outcomes for Indigenous Australians with advanced PD.
📚 References
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