A Novel Technique: Ultrasonography-Guided Botulinum Toxin Injection in Adductor Type Spasmodic Dysphonia

Spasmodic dysphonia (SD) is a rare disease caused by focal dystonia in the laryngeal muscles. The adductor type SD (AdSD), which affects thyroarytenoid (TA) muscle, found 80% of all patients. For them, voice therapy and medication are less effective definitive surgical treatment has not been established yet. Botulinum toxin injection considered gold standard treatment. However, patients require regular injections every 3-6 months whenever effect botulinum disappears. Therefore, it essential that injecting safe, comfortable, accurate. Injections usually performed under guidance electromyography or laryngoscopy. Ultrasonography (US) familiar device to otorhinolaryngologists recently used evaluate structures. While US only for diagnosis, can also be Here, we describe novel technique inject into TA muscle via trans-cartilaginous approach AdSD.