PubMed · 5231954
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L Schwartz, A M Noyek, D Naiberg. 1966-10-15. Persistent hoarseness.. https://pubmed.ncbi.nlm.nih.gov/5231954/
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Subjective voice qualities are difficult to transform into permanent objective visual patterns. Voice spectrography is not a new method of voice analysis. However, in spite of many contributions to the literature, few otolaryngologists have used this interesting method as a clinical tool for evaluating the voice before and after surgical voice procedures. We used the Yanagihara method for classifying degrees of hoarseness, witch is based on the appearance of noise components and loss of harmonic components as the major acoustic factors related to hoarseness. This classification is clinically useful because the severity of hoarseness can be numerically expressed. Changes in the harmonic components were analyzed by voice spectrographic analysis.
BACKGROUND: Indirect laryngoscopy (IDL) is often performed prior to thyroid surgery to detect pre-existing vocal cord pathology. METHODS: A retrospective chart review of 201 patients undergoing thyroid surgery at the Prince of Wales Hospital was undertaken in order to study the patterns of pre-operative and postoperative voice changes and IDL findings. RESULTS: A total of 9% of patients had pre-operative voice symptoms, and 22% of this group had abnormalities detected on pre-operative IDL. Of 160 documented IDL, 4% revealed vocal cord pathology in asymptomatic patients, including an asymptomatic recurrent laryngeal nerve palsy. CONCLUSIONS: Indirect laryngoscopy remains a useful but flawed pre-operative screening tool for patients with voice symptoms, but the literature suggests that more advanced phoniatric tests will provide superior diagnostic sensitivity. The role of routine pre-operative laryngoscopy for asymptomatic patients is of debatable value.
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