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Vocal cords paralysis

Question
18 out of 58
 

Paralysis of recurrent laryngeal nerve true is: (AIIMS Nov 2010)



A Common in (Lt) side
B 50% idiopathic

C Cord will be laterally
D Speech therapy given

Ans. A Common in (left) side Ref. Dhingra Sth/ed p 378, 6th/ed p 299; Current otolaryngology 2nd/ed p 457

Unilateral Recurrent Laryngeal Nerve Palsy

a. More common on left side than right side because of the longer and more convoluted course of the left recurrent laryngeal nerve (Rt side is involved only in 3-30% cases) (. option a is correct)

b. Most unilateral vocal cord paralysis are secondary to surgery (. option b is incorrect)

c. Unilateral injury to recurrent laryngeal nerve leads to ipsilateral paralysis of all intrinsic muscles except cricothyroid (which is an adductor of vocal cord). The vocal cord thus assumes a median or paramedian position which does not move laterally on deep inspiration (. option c is incorrect)

Clinical Features

Asymptomatic in 1/3rd cases

In rest of the patients there may be some voice problem . Dysphonia - the voice is hoarse & becomes weak with use. This gradually improves with time due to compensation by the healthy cord which crosses the midline to meet the paralysed one. Generally no speech therapy is required (. option d is incorrect).

Vocal cords paralysis Flashcard List

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