Study Notes on Assessment of Motor Speech Disorders

Assessment of Motor Speech Disorders

Module Learning Outcomes

  • Appraise the evidence base for management decision-making for clients with speech and/or swallowing difficulties. This involves understanding the research and evidence surrounding best practices in the assessment, treatment, and management of motor speech disorders.

  • Describe and evaluate the importance of interdisciplinary teamwork in the clinical management of speech and swallowing difficulties. Emphasizes the collaborative nature of healthcare where professionals from various fields work together for comprehensive patient care.

  • Identify goals for intervention tailored to the individual, with reference to the evidence base. The process of setting intervention objectives specific to the individual patient's needs, informed by relevant research and clinical best practices.

  • Evaluate the impact of speech and swallowing difficulties on the health and well-being of the individual. A comprehensive analysis of how these disorders influence broader aspects of the patient’s quality of life, health status, and social interactions.

Session Learning Outcomes

  • Understand the systematic assessment process for motor speech disorders. This includes a thorough introduction to the steps involved in evaluating motor speech disorders systematically.

  • Apply assessment tools and interpret results. Students will learn how to utilize various tools for assessment and properly interpret the results to guide clinical decisions.

  • Develop clinical reasoning skills for differential diagnosis. Strengthening skills necessary for differentiating between various motor speech disorders based on assessment findings.

Why Do We Assess?

  • Understand the problem. Assessments provide clarity on the nature and extent of the speech disorder.

  • Understand the impact. Evaluation helps in recognizing how the disorder affects daily life and participation in community activities.

  • Inform decision-making. Assessment results guide treatment strategies and care plans.

  • Track change. Ongoing assessments gauge progress and the effectiveness of interventions over time.

Expected Outcome of Assessment - The ICF Framework

International Classification of Functioning, Disability, and Health (ICF) Framework: This provides a structured approach to understanding health conditions and their impact on various life dimensions, including:

  • Health condition (disorder or disease)

  • Body functions/body structures

  • Activities

  • Participation

  • Environmental factors

  • Personal factors

Assessment Methods

Assessment ≠ just using a test: Assessment is defined as systematic information gathering intended to answer a clinical question and includes:

  • Case History: Collection of relevant medical, social, and communication history.

  • Observation: Watching the patient perform tasks or communicate in various settings to evaluate their abilities.

  • Formal Assessment: Using standardized tests to quantitatively measure speech abilities.

  • Informal Assessment: Non-standardized observations and interactions that provide qualitative data.

  • Patient-Reported Outcome Measures (PROMs): Tools that gather patients’ perspectives on their health and treatment outcomes.

  • Instrumental Measures: Utilizing technology and equipment to gather performance data on speech production.

Assessment Decision-Making Framework

  • WHY are we assessing? To determine the clinical question that needs to be answered regarding the patient’s condition.

  • WHEN do we assess? Consideration of the timing for assessments such as:

    • Initial assessment

    • Follow-up assessment

    • Outcome measurement.

  • WHAT do we assess? Identification of the specific areas to evaluate:

    • Subsystems (speech mechanisms)

    • Severity

    • Impact on functionality

    • Contextual factors.

  • HOW do we assess? Selection of appropriate tools, methods, and administration processes for evaluations.

Assessment Toolbox

  • Case History and Interview: Gathering detailed background information.

  • Informal Observation and Assessment of Speech Systems: Watching and evaluating the patient's speech informally.

  • Formal Standardized Assessment: Utilization of standardized tests for objective measurement.

  • Person Reported Outcome Measures: Understanding the patient’s view of their speech issues.

  • Instrumental Measures: Acoustic and physiological measures for detailed analysis of speech production.

Case History Components

  • Medical Diagnosis and History: Understanding the patient's medical background relating to their speech disorder.

  • Review of Auditory, Visual, Motor, Cognitive, Language, and Emotional Status: A comprehensive overview of functional areas potentially affecting communication.

  • Education, Vocation, and Cultural and Linguistic Backgrounds: Gathering socio-economic and cultural context relevant to assessment and intervention.

  • Patient and Family Report: Involvement of patient and family perspectives.

  • Identification of Facilitators of and Barriers to Communication: Understanding what helps or hinders communication effectiveness.

Formal Assessments Materials

Examples of Formal Assessment Tools:

  1. Apraxia Battery for Adults (ABA-2): Utilized to assess apraxia, providing insights into speech production errors relating to motor planning.

    • Purpose: Verify presence of Apraxia of Speech and estimate severity.

    • Time: Approximately 20 minutes for administration.

    • Administration guidelines include scoring only the second attempt if the task is demonstrated.

  2. Frenchay Dysarthria Assessment-2 (FDA-2):

    • Purpose: Assess physical aspects of speech production in adults suspected of having dysarthria.

    • Time: Approximately 20-30 minutes for assessment.

    • Key Feature: Rating scale measuring from typical function to no function across various subsystems.

What Gets Assessed?

Key components of assessment include:

  • Reflexes: Assessing the reflexive responses that can affect speech production.

  • Respiration: Evaluating breath control and the respiratory subsystem crucial for speech.

  • Lips: Observing lip movements and strength during speech.

  • Jaw: Assessing the range of jaw movement and stability during speech.

  • Palate: Assessment of the soft palate's role in speech.

  • Laryngeal Mechanisms: Evaluation of voice production and pitch control.

  • Tongue: Mobility, strength, and function of the tongue necessary for articulation.

  • Intelligibility: Assessment of how clearly speech is understood by listeners.

Administration Key Points for Screening

  • Patients may take two attempts on each task; the second is scored.

  • Demonstrations of tasks should be used to facilitate understanding, but third attempts should not be recorded.

  • Clear and simple instructions must be given to avoid confusion.

  • Effective observation is critical during tasks to ensure proper scoring.

Scoring Criteria for Assessments

Best-Fit Descriptors include:

  • a = normal for age

  • b = mild abnormality noticeable to a skilled observer

  • c = abnormality obvious but can perform task/movement with reasonable approximation

  • d = some production of task but poor in quality, unable to sustain, inaccurate or extremely labored

  • e = unable to undertake task/movement/sound

  • Half steps are acceptable in scoring for more nuanced results.

FDA-2 Interpretation

What It Tells You:

  • Identification of which subsystems (reflexes, respiration, lips, palate, larynx, tongue) are affected and the severity of impairment.

What It Doesn’t Tell You:

  • The functional impact of these impairments.

  • The underlying causes of the condition.

  • How it specifically affects speech tasks in context.

Evaluation Limitations

  • ‘Best fit’ descriptors may not always correlate well to clinical relevance.

  • Intelligibility tests require visual and reading skills, which may skew results.

  • Subjectivity in interpretation exists despite standardization, highlighting intra-rater reliability issues.

Strengths of Assessment Tools

  • No frequency effect on reliability; can assess as often as necessary.

  • Standardized across various populations and forms of dysarthria, facilitating broader applicability.

  • Short administration time leads to efficiency in clinical settings.

  • Scoring and interpretation are quick and simple, requiring minimal resources.