The Role and Techniques of Laryngeal Electromyography

Laryngeal Electromyography in Adults With Parkinson's Disease and Voice Complaints

“…There are reports of a greater laryngeal resistance, decreased vocal fold abduction, compensatory false vocal cord hypertrophy, altered glottic closure and hypophonia observed on glottic measures, 2 videolaryngoscopy, and acoustic voice analysis 5 . Electromyography is the only available objective test of the electrical function of the intrinsic laryngeal muscles 9 . Electromyography studies of other body segments in patients with PD have shown a great variability of findings, from decreased motor units and increased variability of firing of motor unit potentials to decreased velocity in motor conduction of peripheral nerves and an increased time of motor conduction of relaxed muscles 10 …”

“…Each electrode has specific properties and uses. In the current study, monopolar electrodes were chosen because of their ability to capture several simultaneous action potentials 9 . Monopolar electrodes function as true microphones, capturing motor unit potentials of several muscle fibers simultaneously.…”

“…5 Electromyography is the only available objective test of the electrical function of the intrinsic laryngeal muscles. 9 Electromyography studies of other body segments in patients with PD have shown a great variability of findings, from decreased motor units and increased variability of firing of motor unit potentials to decreased velocity in motor conduction of peripheral nerves and an increased time of motor conduction of relaxed muscles. 10 There is a triad of typical symptoms in PD: tremor, muscular rigidity, and bradykinesia.…”

Eletromiografia laríngea e análise vocal em pacientes com Mal de Parkinson: estudo comparativo

“…Anatomical parameters guided needled electrode insertion, as described in the literature, and the experience of the examiner with anatomical specimen dissections. [3][4][5][6] The needled electrode was first allocated to the CT muscle, perpendicular to the cricoid cartilage, 1.5cm from the midline.…”

“…It was included as a diagnostic and therapeutic tool for laryngeal and voice disorders in the late 1980s. 2,3 There are few references about the use of this method for studying laryngeal muscles in patients with Parkinson's disease. These studies have assumed that voice dysfunction was caused by the motor control peculiarities of this disease.…”