What oral mechanism examination finding is NOT typical in a patient with spastic dysarthria?

• A. Fixed face
• B. Slow tongue movements
• C. Rapid and variable palate movement
• D. Decreased range of motion

Answer: (C)

In patients with spastic dysarthria, the characteristics observed during an oral mechanism examination typically include features that reflect the underlying motor control issues associated with the condition. Spastic dysarthria is primarily characterized by increased muscle tone, which results in stiff and uncoordinated movements.

A fixed face is common in spastic dysarthria due to continuous muscle contraction and rigidity, leading to reduced facial expressiveness. Slow tongue movements can also be observed because of the muscle tightness and diminished ability to make quick, coordinated adjustments. Decreased range of motion is a typical finding as well, as the spasticity restricts the normal movement patterns of the oral structures.

In contrast, rapid and variable palate movement is not typical for individuals with spastic dysarthria. Instead, the palate is likely to demonstrate more consistent, slower, and less coordinated movements rather than the rapid variability associated with other types of dysarthria, such as hyperkinetic dysarthria, where irregular and rapid movements may be present. This distinction clarifies why rapid and variable palate movement is the atypical finding in this context.