The Voice Change after Conservative Laryngeal Surgery

조기 후두암 환자에서 보전적 후두수술 후 음성 변화

Objectives : The total laryngectomy for laryngeal cancer has made patients be afraid of voice loss. Early staged glottic or supraglottic cancer can be treated with conservative laryngeal surgery which preserve voice, though which was not normal voice comparing before. Voice analysis is used to evaluates objectively the quality of the voice in pre- and postoperation, 4 different types of conservative laryngeal surgery : laser cordectomy, supracticoid partial laryngectomy, vertical partial laryngectomy, and supralottic laryngectomy. Materials and Methods : The patients who received conservative laryngeal surgery(laser cordectomy : 23 cases, vertical partial laryngecotmy : 9cases, supracriocoid partial laryngectomy : 6cases, supraglottic laryngectomy : 8cases) from 1995 to 2001 in the Asan medical center. Fundamental frequency(F0), shimmer, jitter, noise to harmony ratio(NHR), maximum comfortable phonation time and subglottic pressure were used as parameters for voice analysis. Results : The patients who received laser cordectomy(shimmer : 5.26${\pm}$1.12%, jitter : 3.33${\pm}$0.42%, NHR : 0.47${\pm}$0.02, MPT : 9.32${\pm}$3.59sec) and supraglottic laryngectomy(shimmer : 4.39${\pm}$1.03%, jitter : 1.49${\pm}$0.14%, NHR : 0.51${\pm}$0.06, MPT : 8.9${\pm}$0.59sec) showed better results than other two procedures, but differed from normal value. Especially the patients who received supracricoid partial laryngectomy(shimmer : 9.23${\pm}$1.56%, jitter : 5.81${\pm}$1.23%, NHR : 5.89${\pm}$1.13, MPT : 6.3${\pm}$1.18sec, MFR : 632${\pm}$89ml/sec) had poorer quality of voice but presented fast functional recovery time, and the subjective symptom was improved as time goes by slowly. Conclusion : The appropriate conservative laryngeal surgery for each cancers and stage can preserve the acceptable voice for patients. Supracricoid partial laryngectomy for T1b glottic cancer can be used for acceptable voice despite its poor voice analysis.