Supraglottic Laryngeal Maneuvers in Adductor Laryngeal Dystonia During Connected Speech.

Only twelve adults were studied, six with adductor laryngeal dystonia and six with typical voices. The study used a significance threshold of 0.1 because the sample was small, so some differences may be unstable. The dystonia group was older than the typical-voice group, and age-related laryngeal changes were not separated from dystonia effects. Most patients with dystonia also had secondary muscle tension dysphonia, which can be hard to distinguish from dystonia and may affect laryngeal maneuvers. Obstructions were rated manually from very large video recordings by three raters, and endoscope position, nostril choice, movement, and patient sensitivity could affect what was seen. The reading passages included phonemic content that may itself cause epiglottic or other obstructions, so not all obstruction types reflect dystonia. The CART thresholds were exploratory and were not tested as a diagnostic tool in a separate sample. The study reports observations only; it does not test a therapy or show that these measures change patient care.

The authors declared no known competing financial interests or personal relationships and no conflict of interest.

Do not use the 82-obstruction cutoff or the sphincteric compression finding to diagnose adductor laryngeal dystonia. These results came from six people with dystonia and six typical controls, the analysis was exploratory, and the study did not test how these measures should change clinical decisions.