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Double‐blind controlled study of botulinum toxin in adductor spasmodic dysphonia
Author(s) -
Truong Daniel D.,
Rontal Michael,
Rolnick Michael,
Aronson Arnold E.,
Mistura Kathy
Publication year - 1991
Publication title -
the laryngoscope
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.181
H-Index - 148
eISSN - 1531-4995
pISSN - 0023-852X
DOI - 10.1288/00005537-199106000-00010
Subject(s) - spasmodic dysphonia , botulinum toxin , phonation , medicine , placebo , saline , double blind , anesthesia , surgery , audiology , alternative medicine , pathology
The treatment of adductor spasmodic dysphonia using botulinum toxin A was conducted in 13 patients as a double‐blind, placebo‐controlled study. Patients were diagnosed independently by an interdisciplinary team consisting of speech pathologists, an otolaryngol‐ogist, and a neurologist. The toxin or saline was injected into each thyroarytenoid muscle under electro‐myographic and laryngoscopic guidance. Botulinum toxin A markedly reduced perturbation, decreased fundamental frequency range, and improved the spectrographic characteristics of the voice. Fundamental frequency and phonation time remained unchanged. Patients injected with botulinum toxin A noticed significant improvement in their voices in comparison with the placebo‐treated group. Excessive breathiness of the voice occurred in two patients, and mild bleeding in one patient in the botulinum toxin A‐treated group. Injection with saline resulted in edema of the vocal cord in one patient. Botulinum toxin A proved to be an effective and safe treatment of adductor spasmodic dysphonia.