Abstract
Vocal function following CO2 laser surgery was evaluated in 6 patients from whom various amounts of vocal fold tissue had been removed. Phonatory function was examined by means of ultra high speed photography, aerodynamic tests, psychoacoust is evaluation. The results are summarized as follows: 1) When a part of the unilateral or bilateral vocal ligaments was removed, phonatory function was almost normal. 2) When the entire unilateral vocal fold was removed or when both vocal ligaments on the one side and a part of the vocalis muscle on the other side were removed, phonatory function was somewhat disturbed. However, there was no serious problem in normal conversation. 3) In a case where the vocalis muscle on the bilateral vocal folds was removed, an incomplete glottal closure was observed and phonatory function was severely disturbed.
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