How effective is the Lee Silverman Voice Treatment (LSVT) program in improving laryngeal symptoms in patients with Parkinson disease (PD)?

Updated: Aug 29, 2019
  • Author: Robert A Hauser, MD, MBA; Chief Editor: Selim R Benbadis, MD  more...
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In studies with a 2-year follow-up, patients who received LSVT maintained or improved vocal intensity compared with pretreatment levels. Glottal incompetence and swallowing ability both improved after LSVT, without any significant change in supraglottal hyperfunction. Preliminary positron emission tomography (PET) scans after LSVT training in patients with Parkinson disease show reduced activity in the globus pallidus, an effect similar to pallidotomy. LSVT may also stimulate coordination of motor output beyond the phonatory system in the form of increased orofacial expression.

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