What is a characteristic feature of flaccid dysarthria?

• A. Excessive loudness variations
• B. Weakness and atrophy muscle
• C. Increased muscle tone
• D. Rapid speech rates

Answer: (B)

Flaccid dysarthria is characterized primarily by weakness and atrophy of the muscles involved in speech production. This type of dysarthria arises from damage to the lower motor neurons or the muscles themselves, leading to reduced muscle strength. The resulting weakness affects the respiratory, phonatory, and articulatory systems, which can manifest as breathy voice quality, reduced loudness, imprecise articulation, and overall poor speech intelligibility.

The presence of muscle atrophy can also be a visual indicator of underlying issues, as the muscles may appear diminished in size due to lack of use or innervation. Therefore, the combination of muscle weakness and atrophy is a defining characteristic of flaccid dysarthria that directly impacts the clarity and effectiveness of speech.

In contrast, the other options refer to features that do not align with the clinical profile of flaccid dysarthria, such as excessive loudness variations, increased muscle tone, or rapid speech rates, which are more closely associated with spastic dysarthria or other types of motor speech disorders.