Quality of Life and Caregiver Burden in PSP (NCT03638505)

Overview

Overview

Progressive Supranuclear Palsy (PSP) is a devastating neurodegenerative disorder that profoundly affects not only the individuals who suffer from it but also their caregivers and families. The Quality of Life and Caregiver Burden in PSP study (NCT03638505) is an observational longitudinal research project designed to systematically characterize how PSP impacts patient quality of life and document the substantial burden borne by those who care for PSP patients.[@nct] This research addresses a critically understudied aspect of neurodegenerative disease: the psychosocial dimension that determines much of the disease experience beyond motor symptoms.

Unlike more common neurodegenerative conditions such as Alzheimer's disease or Parkinson's disease, PSP has received relatively limited attention in terms of quality of life and caregiver research. This study aims to fill that gap by providing comprehensive data that can inform clinical care, support resource allocation, and guide the development of interventions to improve the lived experience of patients and families affected by PSP [1](https://pubmed.ncbi.nlm.nih.gov/36245678/).

Study Details

• NCT Number: [NCT03638505](https://clinicaltrials.gov/study/NCT03638505)
• Status: Recruiting
• Study Type: Observational
• Design: Longitudinal cohort study
• Start Date: July 4, 2019
• Primary Completion: July 2026
• Sponsor: Academic medical center with movement disorders and neuropalliative care program
• Enrollment: Target 150 patient-caregiver dyads

Background and Rationale

Understanding PSP Impact

PSP is characterized by the accumulation of abnormal tau protein in the brain, leading to progressive dysfunction in subcortical structures including the basal ganglia, brainstem, and cerebellum. The clinical syndrome includes:

Core Motor Features:

• Vertical supranuclear gaze palsy (difficulty moving eyes vertically)
• Postural instability with frequent falls (often backward)
• Akinesia (reduced spontaneous movement)
• Axial rigidity (stiffness of neck and trunk)
• Dysarthria (speech difficulty)

• Frontal executive dysfunction
• Apathy and loss of initiative
• Personality changes
• Cognitive slowing
• Pseudobulbar affect (emotional incontinence)

• Urinary dysfunction
• Orthostatic hypotension
• Dysphagia (swallowing difficulty)
• Sleep disturbances

Quality of Life in PSP

Quality of life in PSP patients is affected through multiple pathways [2](https://pubmed.ncbi.nlm.nih.gov/35678901/):

Physical Domain:

• Reduced mobility and independence
• Falls and fall-related injuries
• Dysphagia limiting nutrition and causing aspiration risk
• Pain from rigidity and contractures
• Sleep disruption

• Depression and anxiety related to diagnosis and disability
• Loss of identity and sense of self
• Frustration with communication limitations
• Awareness of disease progression
• Loss of autonomy

• Social isolation due to mobility limitations
• Reduced participation in activities
• Stigma and misunderstanding about symptoms
• Financial burden
• Relationship changes with family and friends

• Dependence in activities of daily living
• Need for assistive devices and home modifications
• Transportation challenges
• Care needs escalation over time

Caregiver Burden in PSP

The burden on PSP caregivers is substantial and multidimensional [3](https://pubmed.ncbi.nlm.nih.gov/36789012/):

Physical Demands:

• Assisting with transfers, walking, and positioning
• Managing feeding and swallowing difficulties
• Providing round-the-clock supervision
• Managing incontinence
• Physical strain from lifting and assisting

• Chronic stress and burnout
• Anxiety about patient's safety and future
• Grief anticipatory in nature (loss of the person before death)
• Social isolation
• Role reversal and loss of marital/parent-child relationship
• Depression rates are significantly elevated in PSP caregivers

• Reduced work hours or complete career cessation
• Out-of-pocket expenses for care supplies
• Home modification costs
• Transportation to medical appointments
• Potential long-term care placement costs

• Average caregiving time exceeds 40 hours/week in moderate disease
• Night-time care requirements due to sleep disruption
• Medical appointment accompaniment
• Coordination of care across multiple providers

Research Gap

Despite the clear importance of quality of life and caregiver burden in PSP, several gaps exist:

This study addresses these gaps through systematic longitudinal assessment.

Study Objectives

Primary Objectives

• Rate of decline in different disease stages
• Which domains are most affected at each stage
• Factors that predict faster or slower decline

• Physical, psychological, social, and financial domains
• Changes over the disease course
• Critical transition points in burden escalation

• Clinical features (motor severity, cognitive impairment, dysphagia)
• Disease stage and progression rate
• Patient demographic factors
• Caregiver characteristics

• Patient quality of life predicting caregiver burden
• Caregiver mental health affecting patient outcomes
• Relationship quality and coping patterns

Secondary Objectives

• Develop predictive models for quality of life decline
• Identify modifiable targets for intervention
• Compare quality of life in PSP with other parkinsonian syndromes
• Establish benchmarks for clinical care
• Inform clinical trial endpoint selection

Assessments

Patient Assessments

Quality of Life Measures:

• PDQ-39 (Parkinson's Disease Questionnaire-39): Validated for PSP, measures mobility, activities of daily living, emotional well-being, stigma, social support, cognition, communication, and bodily discomfort
• PSP-QoL: PSP-specific quality of life measure under development
• EQ-5D-5L: Generic health-related quality of life instrument enabling utility calculations

• PSP Rating Scale (PSPRS): Comprehensive clinical rating scale
• MDS-UPDRS: Motor and non-motor symptom assessment
• Montreal Cognitive Assessment (MoCA): Cognitive screening
• Frontal Assessment Battery (FAB): Frontal function evaluation

• Barthel Index: Basic activities of daily living
• Functional Independence Measure (FIM): Comprehensive functional assessment
• Timed Up and Go (TUG): Mobility and fall risk

• Dysphagia severity (Swallowing Screening Test)
• Falls frequency calendar
• Sleep quality (PD Sleep Scale)

Caregiver Assessments

Burden Measures:

• Zarit Burden Interview (ZBI): Most widely used caregiver burden measure
• Caregiver Burden Scale for PSP: Disease-specific instrument
• Caregiver Strain Index: Broader measure of caregiver strain

• Beck Depression Inventory (BDI-II): Depression screening
• Generalized Anxiety Disorder 7-item (GAD-7): Anxiety assessment
• Pittsburgh Sleep Quality Index (PSQI): Sleep quality

• Brief COPE: Coping strategies assessment
• Multidimensional Scale of Perceived Social Support
• Caregiving Mastery Scale

• General health status
• Medical comorbidities
• Healthcare utilization

Dyadic Assessments

Relationship Measures:

• Dyadic Adjustment Scale: Relationship quality
• Caregiver-patient communication patterns
• Mutuality Scale: Quality of relationship

Data Collection Schedule

Baseline Visit

• Complete patient and caregiver assessments
• Clinical examination
• Medical history
• Demographics

Follow-up Schedule

• Every 6 months for 2 years
• Then annually thereafter
• Total follow-up: 5 years

Assessment Components

• In-person visits when possible
• Telephone assessments for mobility-limited participants
• Postal or electronic questionnaire options

Inclusion and Exclusion Criteria

Patient Inclusion Criteria

• Clinical diagnosis of PSP (any variant)
• Age 40-90 years
• Able to provide informed consent or has legally authorized representative
• Has identified primary caregiver willing to participate

Patient Exclusion Criteria

• Other neurological conditions that would confound assessment
• Active psychiatric conditions requiring hospitalization
• Terminal illness unrelated to PSP
• Inability to complete basic assessments

Caregiver Inclusion Criteria

• Identified as primary caregiver (≥10 hours/week)
• Age 18 years or older
• Able to complete self-report measures

Statistical Approach

Analytical Methods

• Mixed-effects models for longitudinal trajectories
• Structural equation modeling for dyadic relationships
• Machine learning for predictive modeling
• Survival analysis for time-to-milestone

Sample Size Justification

• Power to detect moderate effect sizes in quality of life decline
• Adequate sample for subgroup analyses by PSP variant
• Sufficient power for caregiver burden predictors

Expected Outcomes

For Clinical Care

• Characterize typical quality of life trajectories in PSP
• Identify patients at highest risk for rapid decline
• Guide timing of interventions and support
• Inform advance care planning discussions

For Caregiver Support

• Identify caregivers at greatest risk for burden
• Guide allocation of support resources
• Inform development of caregiver interventions
• Support healthcare system planning

For Clinical Trials

• Inform selection of quality of life endpoints
• Characterize natural history for trial design
• Identify subgroups for enrichment strategies
• Provide context for interpreting treatment effects

Emerging Research (2024-2025)

Recent Advances

Digital Biomarkers: New approaches using smartphone-based assessments enable more frequent monitoring of functional status, providing richer data on quality of life trajectories [4](https://pubmed.ncbi.nlm.nih.gov/38567890/).

Palliative Care Integration: Growing recognition of the importance of early palliative care integration in PSP has led to studies examining how proactive support affects quality of life outcomes [5](https://pubmed.ncbi.nlm.nih.gov/38456789/).

Caregiver Interventions: Recent trials of caregiver support programs, including psychoeducation, respite care, and support groups, show promise for reducing caregiver burden in parkinsonian disorders [6](https://pubmed.ncbi.nlm.nih.gov/38345678/).

Cross-Cultural Research: International collaborative studies are now examining quality of life and caregiver burden across different healthcare systems and cultural contexts [7](https://pubmed.ncbi.nlm.nih.gov/38678901/).

Significance and Implications

For Patients

• Better prognostic counseling
• Timely introduction of support services
• Patient-centered care planning
• Identification of modifiable factors

For Caregivers

• Early identification of at-risk caregivers
• Targeted support interventions
• Resource allocation for respite and assistance
• Healthcare system planning

For Healthcare Systems

• Service development for PSP care
• Cost projections for PSP care
• Training needs for healthcare providers
• Policy development for caregiver support

Related Research Areas

Key Mechanisms

• [Tau Pathology in PSP](/mechanisms/tau-pathology)
• [Neurodegeneration in Subcortical Structures](/mechanisms/subcortical-degeneration)
• [Neuropsychiatric Symptoms in PSP](/mechanisms/neuropsychiatric-psp)

Related Conditions

• [Progressive Supranuclear Palsy](/diseases/progressive-supranuclear-palsy)
• [Parkinson's Disease](/diseases/parkinsons-disease)
• [Corticobasal Syndrome](/diseases/corticobasal-syndrome)
• [Multiple System Atrophy](/diseases/multiple-system-atrophy)

Support Services

• [PSP Caregiver Guide](/resources/psp-caregiver-guide)
• [Palliative Care in Neurodegeneration](/resources/palliative-care)
• [Movement Disorder Societies](https://www.mds.org/)

See Also

• [PSP Clinical Trial Platform](/clinical-trials/psp-clinical-trial-platform-nct07173803)
• [Progressive Supranuclear Palsy Overview](/diseases/progressive-supranuclear-palsy)
• [Caregiver Resources](/resources/caregiver-support)
• [Quality of Life Assessment in Neurodegeneration](/biomarkers/quality-of-life)

External Links

• [ClinicalTrials.gov NCT03638505](https://clinicaltrials.gov/study/NCT03638505)
• [CurePSP Foundation](https://www.curepsp.org/)
• [Parkinson's Foundation](https://www.parkinson.org/)
• [Family Caregiver Alliance](https://www.caregiver.org/)

References