[Analysis of electroglottograph waveform and parameters of benign vocal fold diseases]

To study the sensitivity and specificity and clinical value of electroglottograph (EGG) measurement of benign vocal fold diseases.

365 cases of vocal polyp and vocal cyst and vocal leukoplakia pre- and post-microsurgery were measured, and ECG waveform and their parameters were analyzed, respectively.

EGG waveform of most patients was abnormal with fixed notch or steepness in close-opening phase dominantly. After surgery, most of the waveform returned to normal. The surgery had significant effects on the EGG waveform statistically, while the disease's type did not. Compared with that of vocal polyp and vocal cyst, whose parameters were similar, CQ was smaller and CI was relatively larger in vocal leukoplakia. After the surgery, jitter, shimmer, HNR, CQ and CQP improved in vocal polyp and cyst, while EGG parameters didn't improve except of HNR in leukoplakia.

ECG waveform was sensitive to benign vocal fold diseases to a degree, but the specificity was poor. EGG parameters were affected by vocal lesion and its intrinsic inflammation.