Stroboscopy for benign laryngeal pathology in evidence based health care.

BACKGROUND AND AIMS: Voice disorders are common. The aim of this study is to evaluate the diagnostic value of stroboscopy for voice disorders related with benign pathology and apply results in evidence based health care.
METHODS: Prospective study. Tertiary care hospital. Voice Clinic. One hundred and fifty consecutive patients with an initial diagnosis of benign laryngeal disease or dysphonia of no clarified cause (normal laryngoscopy) were examined stroboscopically and studied prospectively until a final diagnosis was reached. Sixty-six men, eighty women and four children met the selection criteria for the study and had adequate follow-up. The initial laryngoscopic diagnosis was compared to the stroboscopic diagnosis. The diagnostic value of stroboscopy was rated at a scale of 0 to 3. A score 3 describes the diagnostic value of stroboscopy in the cases where the stroboscopic examination resulted to a change of the therapeutic modality offered to the patient.
RESULTS: For one third of the study's population the diagnostic value of stroboscopy was very significant, since it established the laryngeal pathology responsible for the voice disorder (28.8%) and for a small number of patients it changed the choice of treatment (4.7%). For about one third of the cases (32.2%) stroboscopy offered additional information regarding the cause of dysphonia. The diagnostic value of stroboscopy correlated with the type of laryngeal pathology.
CONCLUSIONS: Patients expected to benefit from stroboscopic examination are patients with small lesions of the vocal fold edge, dysphonic patients with unremarkable indirect laryngoscopy, and professional voice users.