Detecting arytenoid cartilage misplacement through acoustic and electroglottographic jitter analysis

The paper describes a comparative study of acoustic and electroglottographic (EGG) jitter extracted from simultaneous recordings of 45 dysphonic patients. The estimated jitter values agreed to within /spl plusmn/20% in 67% of the patients, the difference being above +20% and below -20% in 13% and 20% of the cases, respectively. In the group below -20%, EGG jitter increased due to an increase in EGG shimmer and videoendoscopic images revealed abnormal movements of the arytenoid cartilage caused, possibly, by minor selective paralysis of the intrinsic laryngeal muscles. This observation suggests a possible application of signal analysis techniques in support of the diagnosis of laryngeal disorders.