What type of resonance issue is associated with UUMN dysarthria?

• A. Hyponasality
• B. Normal resonance
• C. Hypernasality
• D. Mixed resonance

Answer: (C)

UUMN (Unilateral Upper Motor Neuron) dysarthria is commonly associated with hypernasality due to the impact of unilateral damage to the upper motor neurons that innervate the muscles involved in speech production. In this type of dysarthria, the weakness or paralysis typically affects the lower facial muscles on one side, including those that contribute to velopharyngeal closure.

When there is inadequate closure at the velopharyngeal port, air can escape through the nasal cavity during speech, leading to an excess of nasal resonance, which is characterized as hypernasality. This resonance issue contrasts with conditions where the velopharyngeal mechanism functions adequately, resulting in a more neutral or nasal balance in voice quality.

Understanding the resonance characteristics associated with various dysarthria types is crucial for making appropriate diagnostic and therapeutic decisions. In the case of UUMN dysarthria, recognizing hypernasality can guide treatment strategies aimed at improving velopharyngeal function and overall speech intelligibility.