Application of videostrobokymography in analyzing factors affecting voice after surgery

Objective:To elucidate the value of videostrobokymography in the evaluation of the characteristics of vocal cord vibration after the surgery. Methods:To analyze the spectrum of the voice before and after the microsurgery of the vocal folds. Using the videostrobokymography to reveal the changes of vibration, especially in the cases with poor spectrum elevation but without obvious recurrence. Results:Two patients were with elevated vocal parameters; 2 patients were with partially elevated vocal parameters（one with Jitter decreased while others elevated; one with Shimmer decreased while others elevated）; the other 3 patients were with decreased vocal parameters. The videostrobokynmography showed the recurrence in 1 patient, but not in others. In 4 cases with elevated vocal parameters, the videostrobokymography showed cycle-to-cycle variability of the amplitude, absence of vibration of vocal fold, glottal axis shift and phase difference . Conclusion:There are certain value of videostrobokymography in analyzing the minor changes of characteristic of vibration of vocal fold.