Question

A 4-year-old child has normal comprehension and cognitive abilities but difficulty planning and coordinating speech movements. Speech is effortful, inconsistent, and the child often struggles to produce the correct sounds. What is the most likely diagnosis?

• A. Speech sound disorder
• B. Isolated expressive language disorder
• C. Childhood apraxia of speech
• D. Global developmental delay

Hint:

Hallmarks of Childhood Apraxia of Speech (CAS):
- Motor planning defect (not a muscle weakness problem like dysarthria).
- Inconsistent errors on repeating the same word.
- Visible articulatory "groping" behavior.
- Normal receptive language and comprehension.

Answer 1

The Correct Option is C

Concept:
Childhood Apraxia of Speech (CAS) is a neurological pediatric speech sound disorder in which the precision and consistency of movements underlying speech are impaired in the absence of neuromuscular deficits (e.g., normal muscle tone, intact reflexes).
Explanation:
• The core pathophysiologic impairment in CAS lies in motor planning and programming of the spatio-temporal parameters of movement sequences required for speech production.

• Receptive language, cognitive understanding, and intent to communicate are typically preserved and normal for age, leading to a marked discrepancy between comprehension and motor speech output.

• Key diagnostic clinical features of Childhood Apraxia of Speech include:
1. Inconsistent errors on consonants and vowels in repeated productions of syllables or words.
2. Lengthened and disrupted coarticulatory transitions between sounds and syllables.
3. Inappropriate prosody (e.g., unnatural stress, pausing, and robotic rate).
4. Visible or audible oral groping when attempting to initiate speech sounds.

• Speech sound disorders (articulation/phonological disorders) involve consistent substitutions or omissions of specific sounds rather than motor programming inconsistency and groping.

• Isolated expressive language disorder affects vocabulary and sentence construction rather than the motor execution and sequencing of speech sounds.

• Global developmental delay involves significant delays in two or more developmental domains (motor, language, cognitive, social, adaptive), which is ruled out by the child's normal cognition and comprehension.
Final Answer:
The clinical presentation of effortful, inconsistent sound production with intact comprehension and difficulty in motor planning of speech movements characterizes Childhood Apraxia of Speech.