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Laryngospasm mechanism. Definition. Laryngospasm: Stimulation of vagus nerve during light anesthesia (Superior Laryngeal n, pharyngeal br of vagus, recurrent laryngeal below cords). Muscles involved: lateral cricoarytenoid, thyroarytenoids (both from recurrent laryngeal), crycrothyroid (from external branch of superior laryngeal).
To summarize, the exact cause of this condition is not clearly evident and may be multifactorial. A hypothesis is that mediation of the vagus nerve may alter the laryngeal tone and lower the threshold for stimuli to produce vocal cord spasm or to precipitate the abnormal adduction of vocal cords.aradoxical vocal cord motion can be confirmed on laryngoscopy performed when patients are symptomatic. The clinical history provides limited opportunity to distinguish between patients with VCD and patients with asthma because both groups present with symptoms of wheezing, cough, and dyspnea.