Wolfe V I, Ratusnik D L
Laryngoscope. 1981 Apr;91(4):635-43. doi: 10.1288/00005537-198104000-00019.
Vocal symptomatology of 24 patients was assessed following the removal of polyps (12 cases) and polypoid degeneration (12 cases). In addition to fundamental frequency, hoarseness type was measured using the spectrographic system developed by Yanagihara which assesses harmonic structure of phonemes relative to noise components. Mean vocal frequency (155Hz) for the polypoid degeneration group was significantly lower than mean vocal frequency for the polyp group (186Hz). There was no difference between the two groups in mean spectrographic hoarseness type. Analysis of data suggested two subgroups of postoperative dysphonia based upon vocal symptomatology: Type A--little or no hoarseness and Type B--severe hoarseness. Neither preoperative nor postoperative conditions of the vocal cords were related to the severity of hoarseness demonstrated by Type B dysphonics. Illustrative cases are presented. One possible explanation for severe postoperative dysphonia is developed.
在切除息肉（12例）和息肉样变性（12例）后，对24例患者的嗓音症状进行了评估。除了基频外，使用柳原开发的频谱系统测量嘶哑类型，该系统评估音素相对于噪声成分的谐波结构。息肉样变性组的平均嗓音频率（155Hz）显著低于息肉组的平均嗓音频率（186Hz）。两组在平均频谱嘶哑类型上没有差异。数据分析表明，根据嗓音症状，术后发声困难可分为两个亚组：A型——几乎没有或没有嘶哑，B型——严重嘶哑。B型发声困难患者的嘶哑严重程度与术前和术后声带状况均无关。文中展示了一些典型病例，并对严重的术后发声困难提出了一种可能的解释。
