Effect of Levodopa + Carbidopa on the Laryngeal Electromyographic Pattern in Parkinson Disease.

Background: Vocal impairment is one of the main debilitating symptoms of Parkinson disease (PD). The effect of levodopa on vocal function remains unclear.

Objective: This study aimed to determine the effect of levodopa on electromyographic patterns of the laryngeal muscle in patients with PD.