title: Fiber-optic video study of the post-laryngectomized voice.
abstract: Simultaneous video-fluoroscopy and fiber-optic video laryngoscopy was carried out on a series of eight laryngectomees. Previous concepts supported by an earlier report1 indicated that the folds of the rebuilt cricopharyngeal sphincter were seen to represent the primary source of sound vibration for voice production. Fold vibration was envisioned as an essential for sound production. Present findings present a challenge to the older concept. The fluoroscopic studies showed a considerable variation in the vertical thickness of the sphincteric area--from several millimeters to as many as 10 centimeters. Mucus bubbles in rapid motion were easily visible immediately above the narrowest portion of the reconstructed cervical esophagus. Ingestion of barium only enhanced the visualization of this bubbling. Vibration of a long vertical area of the thin anterior and thicker posterior esophageal walls well above and well below this point was regularly noted. Fiber-optic visualization failed to show actual fold vibration at any time. Momentary opening of the food tract during air injection or intake, immediately prior to the onset of phonation, was seen on many occasions. During phonation, routinely, the anticipated pseudoglottic opening was obscured by bubbles of mucus or barium. These findings suggest that the air, when accumulated below the narrowest spot in the hypopharyngeal-esophageal tract and when forced upward through a narrow opening, sets the accumulated mucus, not the mucous membrane, into vibration; further, that this vibration is of sufficient amplitude to transmit itself to both the anterior wall and the posterior wall of an extensive vertical portion of the neck.
mesh_terms: D000328:Adult; D000388:Air; D005260:Female; D005336:Fiber Optic Technology; D005471:Fluoroscopy; D006801:Humans; D007825:Laryngectomy; D007828:Laryngoscopy / Q000379:methods; D008297:Male; D008875:Middle Aged; D009040:Motion Pictures; D009093:Mucus; D055100:Optical Fibers; D013016:Sound; D013071:Speech, Alaryngeal; D014732:Vibration; D014831:Voice