• Miwako Kimura, Takaharu Nito, Ken-Ichi Sakakibara, Niro Tayama, and Seiji Niimi.
• Department of Otorhinolaryngology and Head and Neck Surgery, Graduate School of Medicine and Faculty of Medicine, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8655, Japan. mkimu-tky@umin.ac.jp
• Auris Nasus Larynx. 2008 Mar 1; 35 (1): 67-75.

ObjectiveThis study evaluated the results of laryngeal collagen injection.Study DesignRetrospective study of patients who had undergone laryngeal collagen injection.Materials And MethodsA retrospective review of 275 patients treated with collagen injection and a review of the relevant literature on the results of treatment were presented. Follow-up studies were performed for at least 3 months on 155 patients. The patients' voice quality was assessed by perceptual voice analysis using the GRBAS scale, and their vocal function was assessed by acoustic and aerodynamic measures (maximal phonation time and mean flow rate). Assessments were performed before and after collagen injection.ResultsMean objective measures and clinician's perceptual ratings demonstrated measurable improvement in vocal function and voice quality after collagen injection. There were no major complications and no hypersensitivity reactions.ConclusionAs an outpatient office procedure, collagen injection offers a simple, efficient and effective treatment for dysphonia. Various aspects of the procedure for anesthesia, injection techniques, and patient selection are discussed.

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