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Better Speech Therapy for Children with Down syndrome

  • Published: 2016-02-05 : Author: University of Vermont : Contact:
  • Synopsis: Study shows children with Down syndrome who have motor speech deficits have been inadequately diagnosed.

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"Children with Down syndrome who have motor speech disorder characteristics have historically been diagnosed as having childhood dysarthria."

A new study indicates that children with Down syndrome who have motor speech deficits have been inadequately diagnosed, which could have a major impact on the interventions used by speech pathologists when treating patients.

Children with Down syndrome who have motor speech disorder characteristics have historically been diagnosed as having childhood dysarthria. Meanwhile, symptoms of childhood apraxia of speech may have been missed based on the assumption that they coud not have both disorders. The study, published in the International Journal of Speech-Language Pathology, provides evidence that children can have both motor speech disorders.

Shelley Velleman, chair of the Department of Communications Sciences and Disorders at the University of Vermont, and her colleagues conducted motor speech assessments on seven children with Down syndrome in comparison with typically developing children. They also analyzed the motor speech and non-speech oral motor skills of all participants using an investigator checklist of characteristics of apraxia, dysarthria as well as other non-specified motor speech disorders.

The results support Velleman's hypothesis that children with Down syndrome who exhibit symptoms of both disorders can, in fact, have overlapping symptoms, and should be treated for all of them. "Children have been automatically placed in one of those boxes," Velleman says, "when the reality is that many kids have a combination, so you have to look at all of the symptoms and treat the child accordingly or it's not going to be very helpful."

The finding is especially significant because of the different ways in which speech pathologists work with children who have apraxia compared to those with dysarthria. Therapy for dysarthria, a neuromotor disorder, is largely compensatory because the motor pathways are damaged and cannot be repaired. Consequently, clinicians teach techniques that increase intelligibility or clarity of speech. Conversely, most individuals with apraxia benefit more from therapy focusing on motor planning training as opposed to compensation.

"With dysarthria, kids' brains know what to do, but they can't carry it out because the muscles they use to speak have low tone or are weak," says Velleman. "With apraxia the muscles can do it, but it's a matter of the brain not being able to communicate with the muscles. So if you took a kid with apraxia and you worked on dysarthria to try to get a nice strong "S" sound, well that's nice, but they won't be able to do it when they need to."

Velleman advises therapists to treat the symptoms they see regardless of the diagnosis. "The most important thing is to figure out the symptoms," she says. "If they have three symptoms of dysarthria, three of apraxia and three of something else like a phonological disorder, don't worry about an official diagnosis; go ahead and treat all of the symptoms."

For those who want a definitive diagnosis, Velleman and her co-authors, Vani Rupela, a speech language pathologist in the Fairfax County, Virginia, public school system, and Mary Andrianopoulos, an associate professor in the Department of Communication Disorders at the University of Massachusetts Amherst and a 1979 UVM alum, developed a test they named the Language-Neutral Assessment of Motor Speech for young children, or LAMS.

Developed specifically for their study, the test allowed the team to conduct the motor speech assessments on the children with Down syndrome, the most commonly occurring chromosomal condition in the United States. The test, which may become available to all speech pathologists in the future, included an observational portion that recorded 50 child utterances during a child-parent conversation, and an imitative task-based section using age-appropriate toys and materials in a play-oriented protocol.

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