. The role of electromyography in the evaluation of unilateral vocal cord paralysis
Sherif Abu Hegazy Ibrahim EI-Saka;
Abstract
Vocal cord paralysis is a sign of disease and not a diagnosis.
There are two categories of unilateral vocal cord paralysis (UVCP); pure RLN paralysis and RLN plus SLN paralysis. In RLN paralysis, during inspiration; the affected cord remains in the paramedian position. On phonation, there is I to 2 mm between the membranous vocal cords. In RLN+SLN paralysis, the affected cord is thinner and more bowed. On respiration, it lies in the intermediate position. On phonation, there is 2 - 2.5 mm glottic chink between the membranous vocal cords. Both categories cause weakness and breathiness of voice and diplophonia.
Left vocal cord paralysis is more common because the left RLN has a longer pathway that makes it more susceptible to injury.
Unilateral vocal cord paralysis (UVCP) has many causes including; surgical trauma mostly during thyroidectomy, malignant diseases, idiopathic, inflammatory, non-surgical trauma and neurological.
UVCP is diagnosed by history, clinical examination, indirect or direct laryngoscopy, special tests and recent modalities e.g. stroboscopy, ultrasonography, electrogottography, three-dimensional CT with virtual endoscopy. One of the most valuable investigations is laryngeal electromyography. It has an important diagnostic and prognostic value. It can determine if the immobile vocal cord was due to neurogenic disorder of the RLN or fixation of the cricoarytenoid joint. It localizes the site and the degree of laryngeal paralysis, defines the prognosis of laryngeal paralysis
There are two categories of unilateral vocal cord paralysis (UVCP); pure RLN paralysis and RLN plus SLN paralysis. In RLN paralysis, during inspiration; the affected cord remains in the paramedian position. On phonation, there is I to 2 mm between the membranous vocal cords. In RLN+SLN paralysis, the affected cord is thinner and more bowed. On respiration, it lies in the intermediate position. On phonation, there is 2 - 2.5 mm glottic chink between the membranous vocal cords. Both categories cause weakness and breathiness of voice and diplophonia.
Left vocal cord paralysis is more common because the left RLN has a longer pathway that makes it more susceptible to injury.
Unilateral vocal cord paralysis (UVCP) has many causes including; surgical trauma mostly during thyroidectomy, malignant diseases, idiopathic, inflammatory, non-surgical trauma and neurological.
UVCP is diagnosed by history, clinical examination, indirect or direct laryngoscopy, special tests and recent modalities e.g. stroboscopy, ultrasonography, electrogottography, three-dimensional CT with virtual endoscopy. One of the most valuable investigations is laryngeal electromyography. It has an important diagnostic and prognostic value. It can determine if the immobile vocal cord was due to neurogenic disorder of the RLN or fixation of the cricoarytenoid joint. It localizes the site and the degree of laryngeal paralysis, defines the prognosis of laryngeal paralysis
Other data
| Title | . The role of electromyography in the evaluation of unilateral vocal cord paralysis | Other Titles | تقييم استخدام رسم العضلات الكهربائى فى حالات شلل احد حبلى الصوت | Authors | Sherif Abu Hegazy Ibrahim EI-Saka | Issue Date | 2002 |
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