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  • Title: Vocal fold immobility: a longitudinal analysis of etiology over 20 years.
    Author: Rosenthal LH, Benninger MS, Deeb RH.
    Journal: Laryngoscope; 2007 Oct; 117(10):1864-70. PubMed ID: 17713451.
    Abstract:
    OBJECTIVES: To determine the current etiology of vocal fold immobility, identify changing trends over the last 20 years, and compare results to historical reports. STUDY DESIGN: The present study is a retrospective analysis of all patients seen within a tertiary care institution between 1996 and 2005 with vocal fold immobility. The results were combined with a previous study of patients within the same institution from 1985 through 1995. Results were compared to the literature. METHODS: The medical records of all patients assigned a primary or additional diagnostic code for vocal cord paralysis were obtained from the electronic database. RESULTS: Eight hundred twenty-seven patients were available for analysis (435 from the most recent cohort), which is substantially larger than any reported series to date. Vocal fold immobility was most commonly associated with a surgical procedure (37%). Nonthyroid surgeries (66%), such as anterior cervical approaches to the spine and carotid endarterectomies, have surpassed thyroid surgery (33%) as the most common iatrogenic causes. These data represent a change from historical figures in which extralaryngeal malignancies were considered the major cause of unilateral immobility. Thyroidectomy continues to cause the majority (80%) of iatrogenic bilateral vocal fold immobility and 30% of all bilateral immobility. CONCLUSIONS: This 20-year longitudinal assessment revealed that the etiology of unilateral vocal fold immobility has changed such that there has been a shift from extralaryngeal malignancies to nonthyroid surgical procedures as the major cause. Thyroid surgery remains the most common cause of bilateral vocal fold immobility.
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