Transoral approach to laser thyroarytenoid myoneurectomy for treatment of adductor spasmodic dysphonia: short-term results.
OBJECTIVE
The surgical technique for the resection of the recurrent laryngeal nerve for adductor spasmodic dysphonia (ASD) has high late failure rates. During the past decade, botulinum toxin has emerged as the treatment of choice for ASD. Although effective, it also has significant disadvantages, including a temporary effect and an unpredictable dose-response relationship. In this study we investigated the effectiveness of a new transoral approach to laser thyroarytenoid myoneurectomy for treatment of ASD.


METHODS
Fourteen patients with ASD underwent transoral laser myoneurectomy of bilateral thyroarytenoid muscles. Under general anesthesia, an operating microscope and a carbon dioxide laser were used to perform myectomy of the mid-posterior belly of bilateral thyroarytenoid muscles together with neurectomy of the terminal nerve fibers among the deep muscle bundles. Care was taken not to damage the vocalis ligaments, arytenoid cartilages, and lateral cricoarytenoid muscles. Preoperative and postoperative videolaryngostroboscopy and vocal assessments were studied.


RESULTS
The 13 patients who completed more than 6 months follow-up were enrolled in this study. Moderate and marked vocal improvement was achieved in 92% of the patients (12 of 13) after laser surgery during an average follow-up period of 17 months (range, 6 to 31 months). No vocal fold atrophy or paralysis was observed in any patient. None of the patients had a recurrence during the follow-up period.


CONCLUSIONS
Transoral laser myoneurectomy of bilateral thyroarytenoid muscles is a relatively simple, effective, and valuable technique for the treatment of ASD. The durability of outcome achieved with this procedure is encouraging.
Su
Chih-Ying
CY
Department of Otolaryngology and the Voice Center, Chang Gung Memorial Hospital, Kaohsiung Medical Center, Chang Gung University College of Medicine Kaohsiung, Taiwan.
Chuang
Hui-Ching
HC
Tsai
Shang-Shyue
SS
Chiu
Jeng-Fen
JF
D000328:Adult; D000368:Aged; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007821:Laryngeal Muscles / Q000294:innervation / Q000601:surgery*; D007828:Laryngoscopy; D053685:Laser Therapy / Q000379:methods*; D008297:Male; D008875:Middle Aged; D013035:Spasm / Q000601:surgery*; D016896:Treatment Outcome; D014741:Video Recording; D014827:Vocal Cords / Q000601:surgery*; D014832:Voice Disorders / Q000601:surgery*; D014833:Voice Quality