Figure 2From: Formant analysis in dysphonic patients and automatic Arabic digit speech recognition Laryngopharyngeal reflux disease (LPRD). The patient suffers from LPRD. LPRD is the retrograde movement of gastric contents into the laryngopharynx leading to symptoms referable to the larynx, hypopharynx, and nasopharynx. This disease causes abnormal vocal cord vibration.Back to article page