title: Teflon injection in 16 patients with paralytic dysphonia: perceptual and acoustic evaluations.
abstract: Sixteen patients with paralytic dysphonia were treated with Teflon injection in the paralyzed vocal fold. Trained voice pathologists rated the pre- and postinjection voices on a 5-point scale for each 11 voice characteristics. Among these, aphonia, breathiness, and hypofunction diminished significantly after injection. The perceptual evaluation was correlated with acoustic data from long-time-average spectrum analysis, fundamental frequency distribution analysis, and waveform perturbation analysis. In this acoustic assessment, systematic changes were found in the long-time-average spectra, which agreed well with the perceptual data. In 12 of 16 patients the voice was both perceptually and acoustically improved after Teflon injection.
mesh_terms: D000328:Adult; D000368:Aged; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011138:Polytetrafluoroethylene / Q000008:administration & dosage*; D013018:Sound Spectrography; D013060:Speech; D013061:Speech Acoustics; D014826:Vocal Cord Paralysis / Q000150:complications*; D014831:Voice; D014832:Voice Disorders / Q000628:therapy*; D014833:Voice Quality
chemical_list: D011138:Polytetrafluoroethylene