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To the Editor:
We read with interest the article “Improvement of voicing in patients with Parkinson’s disease by speech therapy” by de Swart et al.1 and the Commentary by Rosenfeld.2 We would like to point out a number of inaccuracies in the de Swart et al. article that are misleading to the readership.
de Swart et al. state that they compared pitch limiting voice treatment (PLVT) with Lee Silverman voice treatment (LSVT). The use of the name LSVT is incorrect. LSVT is a well-researched treatment program administered in 16 individual 50-minute sessions in 1 month by a speech clinician who is trained and certified in its administration. Published data support both short- and long-term (2 years) improvement in speech and voice after 1 month of treatment,3 as well as improvements in swallowing and neural functioning.4,5⇓ In the de Swart et al. study, the authors simply stimulated patients to “speak loud/shout” in one 30-minute session and called this LSVT.
As we recently published,5 PET data pre–post LSVT …
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