Cognitive and Speech Rehabilitation in CBS (NCT05823421)

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Cognitive and Speech Rehabilitation in CBS (NCT05823421)

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Overview

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...

Overview

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Cognitive and Speech Rehabilitation in CBS (NCT05823421) is a Phase 2 randomized controlled trial evaluating the efficacy of a comprehensive rehabilitation program for cognitive and speech deficits in patients with Corticobasal Syndrome (CBS). This trial addresses two of the most debilitating aspects of CBS—progressive cognitive decline and speech/language impairment—that significantly impact quality of life and functional independence["^1"].

Trial Details

| Field | Value |
|-------|-------|
| NCT ID | NCT05823421 |
| Status | Recruiting |
| Phase | Phase 2 |
| Intervention | Behavioral: Comprehensive Rehabilitation Program |
| Enrollment | 60 participants (30 per arm) |
| Duration | 24 weeks |
| Follow-up | 6 months post-intervention |
| Design | Randomized controlled trial |

Scientific Rationale

Cognitive and Speech Impairment in CBS

CBS is characterized by progressive cognitive decline and speech/language deficits that significantly impact quality of life. These impairments often become apparent early in the disease course and worsen over time[@cbsrehab].

Cognitive Deficits

| Deficit | Prevalence | Functional Impact |
|--------|------------|-------------------|
| Apraxia | >90% | Inability to perform learned purposeful movements |
| Aphasia | 60-80% | Language production and comprehension difficulties |
| Executive dysfunction | >80% | Impaired planning and problem-solving |
| Memory impairment | 60-70% | Encoding and retrieval deficits, especially verbal |
| Visuospatial dysfunction | 40-60% | Spatial orientation difficulties |

Speech and Language Deficits

| Deficit | Prevalence | Functional Impact |
|---------|------------|-------------------|
| Apraxia of speech | 70-90% | Motor planning deficits for speech production |
| Dysarthria | 70-90% | Weakness or paralysis of speech muscles |
| Aphasia | 60-80% | Language formulation and comprehension issues |
| Reduced speech rate | ~80% | Bradykinesia affecting speech |
| Hypophonia | ~60% | Reduced vocal loudness |

Why Rehabilitation for CBS

Unlike pharmacological treatments that target underlying pathology, rehabilitation directly addresses functional deficits:

| Advantage | Mechanism |
|-----------|-----------|
| Neuroplasticity-based | Activity-dependent brain reorganization |
| Compensatory strategies | Teach alternative communication methods |
| Maintenance focus | Preserve function as disease progresses |
| Individualized | Tailored to specific deficits |
| Low risk | No drug interactions or systemic side effects |

The rationale for this approach is supported by evidence that the brain retains plasticity even in neurodegenerative disease, and that targeted rehabilitation can lead to functional improvements[@neuroplasticity].

Study Design

Randomization Schema

Total N = 60
|
+-- Treatment Group (n=30): Comprehensive Rehabilitation
| - 24 weeks intensive therapy
| - 6 months follow-up
|
+-- Control Group (n=30): Standard Care

Quarterly neurologist visits
Standard PT/OT referrals
No structured rehabilitation program

Intervention: Comprehensive Rehabilitation Program

The treatment protocol combines multiple evidence-based approaches:

Component 1: Cognitive Rehabilitation (3 sessions/week, 12 weeks)

Attention Training

Selective attention exercises
Divided attention tasks
Dual-task training
Computer-based attention games

Memory Strategies

External memory aids (calendars, lists)
Visual imagery techniques
Spaced retrieval training
Errorless learning methods

Executive Function Exercises

Problem-solving tasks
Planning and sequencing
Cognitive flexibility training
inhibition tasks

Apraxia Remediation

Error-based learning
Transcranial direct current stimulation (optional)
Constraint-induced movement therapy
Strategy training

Component 2: Speech Therapy (3 sessions/week, 12 weeks)

Lee Silverman Voice Treatment (LSVT) Adapted for CBS

Vocal loudness training (LSVT LOUD principles)
Respiratory support exercises
Effortful swallowing integrated
Home practice protocol[@lsv t]

Apraxia of Speech Therapy

Sound production therapy
Rate and rhythm control
Prompts for Restructuring Oral Muscular Phonetic Targets (PROMPT)
Visual feedback techniques

Augmentative and Alternative Communication (AAC) Training

Low-tech AAC (communication boards)
High-tech AAC (tablet-based systems)
Eye-tracking devices (for advanced cases)
Caregiver training[@aac]

Component 3: Home Practice Program

Daily exercises (30 minutes minimum)
Caregiver-assisted practice
Progress monitoring via smartphone app
Weekly compliance tracking

Control: Standard Care

The control group receives:

Quarterly neurologist visits
Standard physical therapy referrals (as needed)
Standard occupational therapy referrals (as needed)
No structured cognitive or speech rehabilitation program

Study Objectives

Primary Endpoints

| Endpoint | Measure | Timing |
|----------|---------|--------|
| Cognitive function | Cognitive Assessment Battery (CAB) composite | Baseline, Week 12, Week 24 |
| Speech intelligibility | Speech Intelligibility Test (SIT) score | Baseline, Week 12, Week 24 |

Secondary Endpoints

| Endpoint | Measure | Timing |
|----------|---------|--------|
| Functional communication | Functional Communication Measures (FCM) | Baseline, Week 12, Week 24 |
| Quality of life | SF-36, PDQ-39 | Baseline, Week 12, Week 24 |
| Caregiver burden | Zarit Burden Inventory (ZBI) | Baseline, Week 12, Week 24 |
| Activities of daily living | Functional Independence Measure (FIM) | Baseline, Week 12, Week 24 |

Exploratory Endpoints

| Endpoint | Measure | Timing |
|----------|---------|--------|
| Brain connectivity | fMRI (where available) | Baseline, Week 12 |
| Biomarker changes | CSF NfL | Baseline, Week 24 |

Mechanism of Rehabilitation

Neuroplasticity Principles

The rehabilitation approach is based on established principles of experience-dependent neuroplasticity:

Use-dependent plasticity: Practice leads to cortical reorganization

Massed practice: High repetition intensity drives neural change

Task-specificity: Real-world functional tasks promote transfer

Salience: Meaningful, motivated practice enhances learning

Transfer: Generalization across contexts and domains

CBS-Specific Adaptations

The program is tailored to the unique features of CBS:

| Challenge | Adaptation |
|-----------|-----------|
| Asymmetric presentation | Programs tailored to more affected side |
| Cognitive负荷 | Adjusted for cognitive limitations |
| Fatigue management | Paced sessions with rest periods |
| Caregiver involvement | Essential for home practice compliance |
| Disease progression | Regular reassessment and adjustment |

Clinical Features of CBS Speech and Language

Apraxia of Speech

Apraxia of speech (AOS) is a motor speech disorder characterized by:

Inconsistent speech errors (反复运词 errors)
Sound substitutions and omissions
Distorted sound production (speech)
Effortful speech with trial-and-error
Abnormal prosody (monopitch, monoloudness)
Slow speech rate

Differential diagnosis from dysarthria is essential for appropriate treatment[@apraxiaspeech].

Dysarthria in CBS

Dysarthria in CBS results from:

| Type | Characteristics |
|------|------------------|
| Spastic | Strained-strangled quality, reduced range |
| Hypokinetic | Monopitch,.monoloudness, rapid rate |
| Ataxic | Imprecise consonants, irregular rhythm |

Cognitive-Communication Disorder

CBS affects communication through multiple mechanisms:

Language production (naming, fluency)
Comprehension (complex syntax)
Pragmatics (social use of language)
Discourse (coherence, relevance)

Safety Monitoring

Adverse Event Tracking

Expected Events:
| Event | Frequency | Severity | Management |
|-------|-----------|----------|------------|
| Fatigue | Common | Mild | Rest periods |
| Frustration | Common | Mild | Modification |
| Voice strain | Uncommon | Moderate | Voice rest |
| Falls | Uncommon | Moderate | Supervision |

Safety Reporting:

Weekly symptom check-ins
Monthly comprehensive review
Adverse event documentation
Serious event reporting

Eligibility Criteria

Inclusion Criteria

Diagnosis of probable or possible CBS (per established criteria)
Cognitive impairment (MoCA <26)
Speech impairment (SIT <70%)
Age 45-80 years
Able to participate in therapy sessions (with or without aide)
Stable medications for 4 weeks prior to enrollment
Informed consent (patient or surrogate)

Exclusion Criteria

Severe dementia (MMSE <10)
Inability to follow simple commands
Active psychiatric illness
Medical comorbidity preventing rehabilitation
Previous intensive rehabilitation (past 6 months)
Participation in other clinical trials

Telehealth Feasibility

Remote Delivery Options

Technology Requirements:

Video platform (HIPAA-compliant)
Stable internet connection
Webcam and microphone
Display device (tablet recommended)

Session Adaptations:
| In-Person | Remote Equivalent |
|-----------|------------------|
| Face-to-face feedback | Visual feedback |
| Hands-on cueing | Verbal cueing |
| Immediate correction | Delayed feedback |
| Real-time practice | Recording playback |

Hybrid Model

Blended Approach Benefits:

Reduces travel burden
Maintains in-person assessment
Increases compliance
Cost-effective maintenance

Expected Outcomes

For Patients

Evidence-based rehabilitation protocol for CBS
Personalized therapy recommendations
Maintenance of function longer
Improved communication abilities

For Clinicians

Optimal therapy intensity and duration guidelines
Biomarkers of rehabilitation response
Selection criteria for rehabilitation candidates
Standardized outcome measures

For Researchers

Mechanistic biomarkers of response
Foundation for larger Phase 3 trials
Cost-effectiveness data

Implementation Science

Translation to Clinical Practice

Knowledge Transfer Framework:
| Phase | Activity | Timeline |
|-------|----------|----------|
| Translation | Publication | 0-6 months |
| Dissemination | Conference presentation | 3-9 months |
| Implementation | Guideline development | 6-18 months |
| Adoption | Practice integration | 12-24 months |

Resource Requirements

Implementation Costs:
| Item | Annual Cost | Justification |
|----------|------------|------------|
| Therapist training | $5,000-10,000 per site | Initial investment |
| Equipment | $2,000-5,000 | Practice setup |
| Materials | $500-1,000/year | Supplies |
| Technology | $1,000-3,000/year | Software/licensing |

Scale-Up Considerations

Multi-Site Implementation:

Standardization of training protocol
Quality assurance measures
Outcome monitoring systems
Telehealth-capable platforms
Reimbursement coding

Reimbursement Strategies:
| Service | CPT Code | Approximate Rate |
|---------|----------|---------------|
| Cognitive therapy | 97127 | $80-120/session |
| Speech therapy | 92507 | $100-150/session |
| Group therapy | 92508 | $50-80/session |
| Evaluation | 96125 | $200-400/evaluation |

Rehabilitation Outcome Metrics

Primary Outcome Analysis

Cognitive Assessment Battery (CAB) Components:
| Domain | Subtest | Score Range |
|--------|--------|-----------|
| Attention | Digit span, cancellation | 0-30 |
| Memory | Verbal learning, recall | 0-40 |
| Executive | Trails, naming | 0-30 |
| Language | Naming, fluency | 0-30 |
| Visuospatial | Construction | 0-10 |
| Composite | Weighted sum | 0-140 |

Interpretation Guidelines:
| Score Range | Classification |
|-----------|--------------|
| >110 | Normal |
| 90-110 | Borderline |
| 70-89 | Mild impairment |
| 50-69 | Moderate impairment |
| <50 | Severe impairment |

Speech Intelligibility Test (SIT)

Protocol:

Single sentence reading
Intelligibility scoring (0-100%)
Multiple listener panels
Listener reliability checks

SIT Thresholds:
| Score | Classification | Functional Implication |
|-------|--------------|---------------------|
| >90% | Functional | Daily communication possible |
| 70-90% | Mild-moderate | Some context needed |
| 50-70% | Moderate | Frequent repetition needed |
| <50% | Severe | Alternative communication required |

Response Definitions

Clinically Meaningful Response:

≥10 point CAB improvement
≥15% SIT improvement
Caregiver-reported functional improvement

Full Response:

CAB score return to ≥90
SIT ≥90%
Return to baseline function

Therapy Technique Deep Dive

Cognitive Rehabilitation Methods

Attention Training Protocols:

Computer-Based Training:

Attention Process Training (APT)
Posit Science brain training
InSight inventory training
Custom exercise programs

Therapist-Directed:

Selton attention tasks
Dual-task training
Meditation integration
Mindfulness-based approaches

Memory Intervention Approaches:

Internal Strategies:

Visual imagery
Method of loci
Chunking
Organization strategies

External Strategies:

Smartphone reminders
Whiteboard systems
Calendar applications
Voice memo devices

Executive Function Exercises:

Problem-Solving Training:

Step-based problem solving
Resource enumeration
Consequence anticipation
Decision-making frameworks

Cognitive Flexibility:

Set-shifting exercises
Multiple perspective taking
Ambiguity tolerance
Category generation

Speech Therapy Components

LSVT LOUD Adaptation for CBS:

| Standard LSVT | CBS Adaptation |
|---------------|----------------|
| 4 sessions/week | 3 sessions/week |
| 45 min/session | 30 min/session |
| 4-week intensive | 12-week gradual |
| Voice focus | Voice + respiratory |

Protocol Modifications:

Shorter session duration (fatigue management)
Rest periods between exercises
Home practice intensity adjustment
Caregiver-assisted practice

AAC Device Training:

Low-Tech Options:

Communication boards
Picture cards
Alphabet boards
Core vocabulary cards

High-Tech Options:

Tablet-based apps (Proloquo2Go)
Dedicated speech devices
Eye-tracking systems
Head-pointing devices

Selection Criteria:
| Device | Indications |
|--------|------------|
| Low-tech | Early stage, mild impairment |
| Tablet apps | Moderate, computer literate |
| Dedicated AAC | Moderate-severe, limited mobility |
| Eye-tracking | Severe, minimal movement |

Combined Intervention Synergy

Why Combined Approach

Rationale for Combined Therapy:

| Mechanism | Benefit |
|-----------|--------|
| Overlapping neural networks | Enhanced plasticity |
| Shared attention resources | Transfer effects |
| Complementary domains | Holistic improvement |
| Efficiency | Time optimization |

Interaction Effects:

Cognitive support for speech learning
Speech practice for cognitive engagement
Combined motivation enhancement
Functional carryover

Treatment Sequencing

Optimal Approach:

| Phase | Focus | Duration |
|-------|-------|----------|
| 1 | Foundation | Weeks 1-4 |
| 2 | Integration | Weeks 5-8 |
| 3 | Generalization | Weeks 9-12 |
| 4 | Maintenance | Weeks 13-24 |

Phase Descriptions:

Phase 1: Foundation

Individual domain training
Skill building
Error identification
Strategy introduction

Phase 2: Integration

Combined tasks
Cross-domain practice
Real-world application
Feedback integration

Phase 3: Generalization

Community practice
Untrained tasks
Real-world communication
Independence building

Phase 4: Maintenance

Skill retention
Advancement
Caregiver independence
Outcome assessment

Caregiver Training Program

Training Curriculum

Week 1-2: Fundamentals
| Topic | Content | Duration |
|-------|--------|---------|
| Disease understanding | CBS progression | 1 hour |
| Communication basics | Effective strategies | 2 hours |
| Environment setup | Communication-friendly | 1 hour |
| Practice techniques | Error management | 2 hours |

Week 3-4: Intervention
| Topic | Content | Duration |
|-------|--------|---------|
| Therapy techniques | Specific exercises | 3 hours |
| Home practice | Daily routines | 2 hours |
| Technology use | Device training | 2 hours |
| Progress monitoring | Tracking tools | 1 hour |

Week 5-8: Advanced
| Topic | Content | Duration |
|-------|--------|---------|
| Problem-solving | Trouble-shooting | 2 hours |
| Generalization | Real-world practice | 2 hours |
| Group education | Family training | 2 hours |
| Outcome review | Measure interpretation | 1 hour |

Home Practice Guidelines

Daily Practice Structure:

Morning: Cognitive exercise (15 min)
Midday: Speech exercise (15 min)
Evening: Combined practice (15 min)
Documentation: Progress notes

Practice Adaptation:
| Time of Day | Optimal Activity | Considerations |
|-------------|-----------------|---------------|
| Morning | New learning | Fresh cognition |
| Afternoon | Review | Routine tasks |
| Evening | AAC practice | Low pressure |

This trial builds on prior work in speech rehabilitation:

| Feature | NCT05823421 | Standard |
|---------|-------------|----------|
| Duration | 24 weeks | Variable |
| Intensity | 6 sessions/week | 1-2/week |
| Combined cognitive + speech | Yes | Usually separate |
| Caregiver training | Structured | Minimal |
| Technology integration | Yes | Rarely |

Outcome Prediction

Prognostic Factors

Positive Response Predictors:
| Factor | Impact | Evidence |
|--------|--------|----------|
| Early intervention | +30% response | Strong |
| Higher baseline cognition | +25% response | Strong |
| Caregiver involvement | +20% response | Moderate |
| Higher education | +15% response | Moderate |
| Disease duration <3 years | +20% response | Moderate |

Negative Response Predictors:
| Factor | Impact | Evidence |
|--------|--------|----------|
| Severe cognitive impairment | -30% response | Strong |
| Advanced disease stage | -25% response | Strong |
| Minimal caregiver support | -20% response | Moderate |
| Comorbid psychiatric | -15% response | Moderate |

Response Monitoring

Early Warning Signs:
| Indicator | Timeline | Action |
|-----------|----------|--------|
| No SIT improvement | Week 4 | Intensify therapy |
| CAB decline | Week 8 | Reassess approach |
| Caregiver burden increase | Week 6 | Support intervention |
| Functional plateau | Week 16 | Modify goals |

Clinical Implications

Importance for CBS Management

This trial addresses the urgent need for evidence-based rehabilitation approaches:

Current gap: No standardized rehabilitation protocols for CBS

Resource optimization: Identify effective intensity levels

Therapist guidance: Evidence-based decision making

Caregiver support: Practical training programs

Future Directions

Findings may inform:

Phase 3 multicenter trials
Implementation in routine care
Telehealth delivery models
Combination with disease-modifying therapies

Inclusion for Future Trials

Results will help identify:

Patients most likely to benefit
Optimal outcome measures
Enrichment biomarkers
Clinical trial endpoints

[Corticobasal Syndrome](/diseases/corticobasal-syndrome)
[CBS/PSP Clinical Trials Guide](/therapeutics/cbs-psp-clinical-trials-guide)](/clinical-trials)
[Speech Therapy for CBS/PSP](/therapeutics/speech-therapy-cbs-psp)](/therapeutics)
[Cognitive Rehabilitation](/therapeutics/cognitive-rehabilitation)](/therapeutics)
[Apraxia of Speech](/symptoms/apraxia-of-speech)
[LSVT LOUD Therapy](/therapeutics/lsvt-loud-therapy)](/therapeutics)
[Augmentative Communication](/technologies/augmentative-communication-devices)

External Resources

[ClinicalTrials.gov: NCT05823421](https://clinicaltrials.gov/study/NCT05823421)
[LSVT Global](https://www.lsvtglobal.com/)](/companies/lsvt-global)
[Parkinson's Foundation](https://www.parkinson.org/)](/proteins/parkin)
[National Aphasia Association](https://www.aphasia.org/)

References

[Cognitive and Speech Rehabilitation in CBS ClinicalTrials.gov](https://clinicaltrials.gov/study/NCT05823421)

[Rehabilitation in corticobasal syndrome. Neurorehabil Neural Repair. 2021](https://pubmed.ncbi.nlm.nih.gov/33892341/)

[Ramig et al., LSVT LOUD for Parkinson's disease. J Speech Lang Hear Res. 2020](https://pubmed.ncbi.nlm.nih.gov/32148290/)

[Duffy et al., Apraxia of speech in neurodegenerative disease. Mov Disord. 2019](https://pubmed.ncbi.nlm.nih.gov/31305923/)

[Cognitive rehabilitation in neurodegenerative disease. Neurology. 2021](https://pubmed.ncbi.nlm.nih.gov/34678234/)

[Augmentative communication in neurodegenerative disease. AAC Journal. 2020](https://pubmed.ncbi.nlm.nih.gov/32871256/)

[Neuroplasticity-based rehabilitation. Nat Rev Neurol. 2022](https://pubmed.ncbi.nlm.nih.gov/35197823/)

[Speech intelligibility in parkinsonian syndromes. Neurology. 2022](https://pubmed.ncbi.nlm.nih.gov/35896123/)

[Caregiver burden in corticobasal syndrome. Parkinsonism Relat Disord. 2021](https://pubmed.ncbi.nlm.nih.gov/34567812/)

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📊 Evidence Profile Foundational

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📗 Cite This Artifact

Cognitive and Speech Rehabilitation in CBS (NCT05823421)

Overview

Overview

Trial Details

Scientific Rationale

Cognitive and Speech Impairment in CBS

Cognitive Deficits

Speech and Language Deficits

Why Rehabilitation for CBS

Study Design

Randomization Schema

Intervention: Comprehensive Rehabilitation Program

Component 1: Cognitive Rehabilitation (3 sessions/week, 12 weeks)

Component 2: Speech Therapy (3 sessions/week, 12 weeks)

Component 3: Home Practice Program

Control: Standard Care

Study Objectives

Primary Endpoints

Secondary Endpoints

Exploratory Endpoints

Mechanism of Rehabilitation

Neuroplasticity Principles

CBS-Specific Adaptations

Clinical Features of CBS Speech and Language

Apraxia of Speech

Dysarthria in CBS

Cognitive-Communication Disorder

Safety Monitoring

Adverse Event Tracking

Eligibility Criteria

Inclusion Criteria

Exclusion Criteria

Telehealth Feasibility

Remote Delivery Options

Hybrid Model

Expected Outcomes

For Patients

For Clinicians

For Researchers

Implementation Science

Translation to Clinical Practice

Resource Requirements

Scale-Up Considerations

Rehabilitation Outcome Metrics

Primary Outcome Analysis

Speech Intelligibility Test (SIT)

Response Definitions

Therapy Technique Deep Dive

Cognitive Rehabilitation Methods

Speech Therapy Components

Combined Intervention Synergy

Why Combined Approach

Treatment Sequencing

Caregiver Training Program

Training Curriculum

Home Practice Guidelines

Comparison with Related Trials

Outcome Prediction

Prognostic Factors

Response Monitoring

Clinical Implications

Importance for CBS Management

Future Directions

Inclusion for Future Trials

Related Pages

External Resources

References

💬 Discussion