What condition in ALS is characterized by inadequate vocal fold closure?

• A. Phonatory incompetence
• B. Bulbar dysarthria
• C. Mixed dysarthria
• D. Respiratory failure

Answer: (A)

The condition in ALS characterized by inadequate vocal fold closure is phonatory incompetence. This refers to the inability of the vocal folds to adequately come together during phonation, which leads to a strained or breathy voice quality. In ALS, the degeneration of motor neurons can affect the muscles that control the vocal folds, resulting in this type of speech production issue.

Phonatory incompetence specifically highlights the challenges related to vocal fold function, distinguishing it from other types of dysarthria that may not primarily focus on the closure of the vocal folds or may involve a broader range of speech motor control issues.

While bulbar dysarthria involves disruptions in the muscles involved in speech production located in the bulbar region of the brain (which includes the brainstem), and mixed dysarthria indicates a combination of different types of dysarthria that can arise due to varied neurological conditions, phonatory incompetence is specifically linked to the efficacy of vocal fold closure. Respiratory failure, on the other hand, pertains to problems with breathing and is not directly about vocal fold closure. Thus, the focus on inadequate vocal fold closure makes phonatory incompetence the correct choice.