DYSARTHRIA in multiple sclerosis ranges in prevalence from 41% to 51% according to studies.  Speech and voice problems may be identified by the person with MS, a family member, or a healthcare professional.  Common complaints include difficulty with precision of articulation (causing the slurring of speech), speech intelligibility, ease of conversational flow, speaking rate, loudness, and voice quality.  In very severe cases, vowels may also be distorted.  When these problems interfere with...