Cylinder & Anesthesia Machine
In complete bilateral paralysis of recurrent laryngeal nerve there is:
|A||Complete loss of speech with stridor and dyspnea|
|B||Complete loss of speech but no difficulty in breathing|
|C||Preservation of speech with severe stridor and dyspnea|
|D||Preservation of speech and no difficulty in breathing|
Complete loss of speech with stridor and dyspnea
a. In partial paralysis cord are held in adduction (as per Semon's law) leading to stridor and respiratory distress (dyspnea).
b. In complete bilateral paralysis cord are not only held in adduction by cricothyroid (supplied by external branch of superior laryngeal nerve) producing stridor and dyspnea but also make the cord to become tense and elongated producing loss of speecl:1 also.