[Quantitative evaluation of nasalance after vertical hemilaryngectomy]

It was important and requisite how to quantitatively evaluate nasalance after vertical hemilaryngectomy in patients with carcinoma of the larynx. The lately invented instrument nasometer, which can evaluate objectively vocal function, were used to determine separately in 30 healthy adults and 30 patient's with laryngeal carcinoma treated primarily by vertical hemilaryngectomy from 1984 to 1994. The results showed that the determined nasalance, have significant difference among surgical groups and normal group (P < 0.001 and P < 0.05). We also found that the determined values of nasalance have significant difference between postoperative two years and postoperative ten years groups (P < 0.01). It proved that the longer postoperative time, the better the patient's vocal function.