Stroboscopy is very useful for clinical evaluation of abnormality in the mode of vocal cord vibration. With good trained eyes. one can detect changes in physical parameters of histological changes in the vocal cord to a certain extent.
Stroboscopic examination was performed on 149 cases who complained of voice disorders at the Department. of Otolarynglogy of Ewha Womans university hospital recently and the following results were obtained.
1) The underlying diseases in order frequency were vocal nodule and polyp 67cases(45%). acute and chronic laryngitis 32cases(22%), benign tumor l6cases(l1%), vocal cord paralysis 15cases(10%), sulcus vocalis 8cases(5%), laryngeal cancer 6cases(4%), epithelial hyperplasia 5cases(3%).
2) Glottic closure in pathological cases were as that follows ; Among l49cases, incomplete closure were 112cases(75%) and complete closure were 37cases(25%).
3) Regularity of vibration in pathological cases were as that follows ; Among l49cases. irregular were 82cases(55%) and regular were 67cases(45%).
4) Symmetry of vibratory movements of vocal cords in pathological cases were as that follows ; Among l49cases. asymmety were 69cases(46%) and symmetry were 80cases(45%).
5) Amplitude of vibration in pathological cases were as that follows ; Among l49cases. normal were 62cases(42%), great were 8cases(5%), small were 74cases(50%) and zero were 5cases(3%).
6) Wave on the mucosa in pathological cases were as that follows ; Among l49cases. normal were 62cases(42%), great were 62cases(1%), small were 2cases(42%) and zero were 23cases(15%).
