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Essential Vocal Tremor

Essential vocal tremor (EVT) is classified as a neurogenic voice disorder and is defined by a rhythmic shaking pattern in the pitch and loudness of the voice occurring in individuals with a diagnosis of essential tremor (ET). ET is one of the most common movement disorders in the world with 4.6% of those 65 years of age or older affected. ET is classified as an action tremor (i.e., tremor onset with muscle contraction associated with a purposeful movement, or during posturing) associated with observation of bilateral involuntary oscillation of the upper limbs, or head while maintaining a posture, or performing a movement. Approximately 30%–40% of individuals diagnosed with ET develop vocal tremor (i.e., EVT). In some cases, onset of vocal tremor may be the primary ...

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