DIFFERENTIAL DIAGNOSIS OF ADDUCTOR SPASMODIC DYSPHONIA AND MUSCLE TENSION DYSPHONIA USING ACOUSTIC PARAMETERS

Objective:The study aimed at differentiating Adductor Spasmodic Dysphonia (ADSD) from Muscle Tension Dysphonia (MTD) using acoustic measurements . Method: Perceptual as well as acoustic analysis of the voice was done on 12 patients of Adductor Spasmodic dysphonics and Muscle tension dysphonics each. The age of these patients ranged between 30 to 64 years . Results: Adductor spasmodic dysphonics statistically differed from muscle tension dysphonia in the acoustic parameters of voice break, harmonic to noise ratio, and jitter. The parameters which showed maximum significance of differences were voice break which was presented only by the adductor spasmodic dysphonics and harmonic to noise ratio which was affected in muscle tension dysphonia. Conclusion: Voice breaks were found to be more sensitive in discriminating adductor spasmodic dysphonia from muscle tension dysphonia in the present study. Percentage of voice break correlated with perceptual assessment of severity.