European archives of oto-rhino-laryngology : official journal of the European Federation of Oto-Rhino-Laryngological Societies (EUFOS) : affiliated with the German Society for Oto-Rhino-Laryngology - Head and Neck Surgery · 2020
"Innocent" arytenoid adduction asymmetry: An etiological survey.
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Mathew Amrita Suzanne, Menon Jayakumar R
Аннотация
PURPOSE: To estimate the incidence of "innocent" arytenoid adduction asymmetry (AAA) among patients presenting at a laryngology clinic, identify its association with demographic characteristics, symptomatology and various clinical/pathological conditions and thereby determine its clinical significance.
METHODS: A prospective comparative observational clinical study was conducted. Group 1 included patients presenting at the Department of Laryngology, identified with a primary diagnosis and coexisting "innocent" AAA i.e., an overriding arytenoid with normal vocal fold mobility on laryngoscopy. Group 2 included an equal number of randomly selected patients fulfilling the same criteria, without AAA. Demographic and clinical details were recorded and analyzed.
RESULTS: 110 cases were included in each group. The incidence of innocent AAA was 12.7%. Males were predominant in both Groups, with the gender difference significant in Group 1. Patients in Group 1 were significantly younger than in Group 2. Professional voice users, namely singers, were significantly greater in Group 1. Symptoms associated with Group 1 (i.e. AAA) were high pitch strain while singing (p = 0.01) and unilateral throat pain (p = 0.01), and the associated diagnoses were Singing Voice Dysphonia (p = 0.005), Vocal Process Granuloma (p = 0.04) and Ventricular Band Dysphonia (p = 0.047). As a definitive diagnosis was made in all patients, the presenting complaints were not attributed to AAA. Right sided preponderance of AAA was significant. Among the diagnoses with a laterality (e.g. vocal process granuloma), AAA was observed contralateral to the pathology in 70.7% and ipsilaterally in 29.3% (p = 0.0058).
CONCLUSION: Innocent AAA is common among males in the 3rd-4th decades, in singers among professional voice users, and in those with the muscle tension dysphonia spectrum and vocal process granuloma, thereby suggesting that it is an acquired habit/response to greater vocal demand. The observation of AAA contralateral to laryngeal lesions, highlights its compensatory nature, attempting to optimize glottic closure.
METHODS: A prospective comparative observational clinical study was conducted. Group 1 included patients presenting at the Department of Laryngology, identified with a primary diagnosis and coexisting "innocent" AAA i.e., an overriding arytenoid with normal vocal fold mobility on laryngoscopy. Group 2 included an equal number of randomly selected patients fulfilling the same criteria, without AAA. Demographic and clinical details were recorded and analyzed.
RESULTS: 110 cases were included in each group. The incidence of innocent AAA was 12.7%. Males were predominant in both Groups, with the gender difference significant in Group 1. Patients in Group 1 were significantly younger than in Group 2. Professional voice users, namely singers, were significantly greater in Group 1. Symptoms associated with Group 1 (i.e. AAA) were high pitch strain while singing (p = 0.01) and unilateral throat pain (p = 0.01), and the associated diagnoses were Singing Voice Dysphonia (p = 0.005), Vocal Process Granuloma (p = 0.04) and Ventricular Band Dysphonia (p = 0.047). As a definitive diagnosis was made in all patients, the presenting complaints were not attributed to AAA. Right sided preponderance of AAA was significant. Among the diagnoses with a laterality (e.g. vocal process granuloma), AAA was observed contralateral to the pathology in 70.7% and ipsilaterally in 29.3% (p = 0.0058).
CONCLUSION: Innocent AAA is common among males in the 3rd-4th decades, in singers among professional voice users, and in those with the muscle tension dysphonia spectrum and vocal process granuloma, thereby suggesting that it is an acquired habit/response to greater vocal demand. The observation of AAA contralateral to laryngeal lesions, highlights its compensatory nature, attempting to optimize glottic closure.