Laryngeal paralysis final

Laryngeal Paralysis
Vocal cord paralysis is a common
problem found in the practice of
Otolaryngology. It is a sign of disease
and not a diagnosis.

The Vagus
 The vagus nerve has three nuclei located
within the medulla:
 1. The nucleus ambiguus
 2. The dorsal nucleus
 3. The nucleus of the tract of solitarius

 The nucleus ambiguus is the motor nucleus
of the vagus nerve.
 The efferent fibers of the dorsal
(parasympathetic) nucleus innervate the
involuntary muscles of the bronchi,
esophagus, heart, stomach, small intestine,
and part of the large intestine.
 The afferent fibers of the nucleus of the tract
of solitarius carry sensory fibers from the
pharynx, larynx, and esophagus

 The superior laryngeal nerve branches
into internal and external branches.
 The internal superior laryngeal nerve
penetrates the thyrohyoid membrane to
supply sensation to the larynx above the
glottis.
 The external superior laryngeal nerve
innervates the one muscle of the larynx
not innervated by the recurrent laryngeal
nerve, the cricothyroid muscle.

 The right vagus nerve passes anterior to the
subclavian artery and gives off the right
recurrent laryngeal nerve. This loops around
the subclavian and ascends in the tracheo-
esophageal groove, before it enters the
larynx just behind the cricothyroid joint.
 The left vagus does not give off its recurrent
laryngeal nerve until it is in the thorax, where
the left recurrent laryngeal nerve wraps
around the aorta just posterior to the
ligamentum arteriosum. It then ascends back
toward the larynx in the TE groove.

The Laryngeal Musculature
 The intrinsic muscles of the larynx, all
of which are innervated by the
recurrent laryngeal nerve, include the:
 Posterior cricoarytenoid - the ONLY
abductor of the vocal folds.
 Functions to open the glottis by
rotary motion on the arytenoid
cartilages.
 Also tenses cords during phonation.

 Lateral cricoarytenoid - - functions to close
glottis by rotating arytenoids medially.
 Transverse arytenoid - - only unpaired
muscle of the larynx. Functions to
approximate bodies of arytenoids closing
posterior aspect of glottis.
 Oblique arytenoid - - this muscle plus action
of transverse arytenoid function to close
laryngeal introitus during swallowing.

 Thyroarytenoid - - very broad muscle, usually
divided into three parts:
 Thyroarytenoideus internus (vocalis) - adductor
and major tensor of free edge of vocal fold.
 Thyroarytenoideus externus - major adductor of
vocal fold
 Thyroepiglotticus - shortens vocal ligaments

Anatomy of the Larynx - Motion
 Adductors of the Vocal Folds:

Wegner and Grossman Theory
 “In the absence of cricoarytenoid joint
fixation, an immobile vocal cord in
paramedian position has total pure
unilateral recurrent nerve paralysis,
and an immobile vocal cord in lateral
position has a combined paralysis of
superior and recurrent nerves (the
adductive action of cricothyroid
muscle is lost)”

Causes of vocal cord paralysis
 Malignant : This accounts for 25% of cases,
one half being caused by carcinoma of lung

 Surgical/Traumatic: (20% cases)
 Thyroidectomy
 Pneumonectomy
 CABG
 Penetrating neck or chest trauma.
 Post intubation
 Whiplash injuries
 Posterior fossa surgery

 Neurulogical (5-10%)
 Wallenberg syndrome (lateral medullary stroke)
 Syringomyelia
 Encephalitis
 Parkinsons,
 Poliomyelitis
 Multiple Sclerosis
 Myasthenia Gravis,
 Guillian-Barre
 Diabetes

 Inflammatory:
 Rheumatoid arthritis ,( really a "fixed" cord here)
 Infectious:
 Syphilis
 Tuberculosis
 Thyroiditis
 Viral

 Idiopathic (20-25%):
 Sarcoidosis,
 Lupus
 Polyarteritis nodosa
 Ortner's syndrome (left atrial hypertrophy).

Intracranial causes
 Head injury
 CVA
 Bulbar
poliomyelitis
 Distinctive features
 Other neurological
signs and
symptoms due to
combined paralysis
of soft palate,
pharynx and larynx

Cranial
 Fracture base of
skull
 Juglar foramen
lesions (Glomus
tumours,
Naspharyngeal
Carcinoma)
 Skull base
osteomyelitis
 Distinctive features
 Other cranial
nerve palsies
(IX,X,XI)
 Pharyngeal,
superior and
Recurrent
Laryngeal nerve

Neck
 Thyroidectomy
 Thyroid Tumours
 Post Cricoid
Carcinoma
 Malignant
Cervical
Lymphnodes
 Distinctive
features
 Superior and
Recurrent
Laryngeal nerves
involved

Chest
 Bronchogenic
Carcinoma
 Cardiothoracic Surgery
 Aortic Aneurysm
 Mediastinal
Lymphadenopathy
 Tracheal/Oesophageal
surgery
 Distinctive
feature
 Involvement of
Left Recurrent
Laryngeal Nerve

Unilateral Superior Laryngeal Nerve Injury
 Normal vocal fold position
during quiet respiration.
 Noticeable deviation of
posterior commissure to
paralyzed side during
phonatory effort
 At rest, the vocal fold on
paralyzed side is slightly
shortened and bowed, and
may be depressed below level
of normal side.

Unilateral Superior Laryngeal Nerve Injury
 Loss of sensation to the supraglottic larynx
can cause subtle symptoms such as frequent
throat clearing, paroxysmal coughing, voice
fatigue, vague foreign body sensations.
 Loss of motor function to cricothyroid muscle
can cause a slight voice change, which the
patient usually interprets as hoarseness.
Most common finding is diplophonia (with
decreased range of pitch, most noticeable
when trying to sing.

Unilateral Recurrent Laryngeal Nerve
Injury
 Nonfunction of the intrinsic muscles
of the larynx on the affected side
(loss of abduction with intact
adduction by cricothyroid) cause
the vocal cord to assume a
paramedian position.
 The voice is breathy but
compensation occurs, though
rarely back to normal.
 The airway is adequate and may
become compromised only with
exertion.

Bilateral Recurrent Laryngeal Nerve Injury
 Usually result of damage
to both RLN.
 Cords lie in paramedian
position
 Voice is good
 Variable degree of stridor

Evaluation – Physical Examination
 Complete Head and Neck
Examination
 Flexible Fiberoptic
Laryngoscopy
 90 degree Hopkins Rod-
lens Telescope
 Adequacy of Airway, Gross
Aspiration
 Assess Position of Cords
 Median, Paramedian,
Lateral
 Posterior Glottic Gap on
Phonation

Evaluation – Unilateral Paralysis
 Manual Compression Test

Management – Unilateral Paralysis
Vocal Cord Injection
 Adds fullness to the vocal cord to help it
better appose the other side
 Injection technique is similar regardless
of material used
 Injection into thyroarytenoid/vocalis
 Injection can be done endoscopically or
percutaneiously
 Poor correction of posterior glottic gap

Vocal Cord Injection

Vocal Cord Injection - Materials
 Teflon
 Fat
 Collagen
 Autologous Collagen
 Homologous Micronized Alloderm (Cymetra)
 Heterologous Bovine Collagen (Zyderm
 Hyaluronic Acid
 Calcium Hydroxyapatite gel (Radiance FN)
 Polydimethylsiloxane gel (Bioplastique)

Type I Thyroplasty

Management
Bilateral Abductor Paralysis
 Patients exhibit lack of
abduction during inspiration,
but good phonation
 Maintenance of airway is
the primary goal
 Airway preservation often
damages an otherwise
good voice
Expiration
Inspiration

Management
Bilateral Abductor Paralysis
 Tracheostomy
 Gold standard
 Most adults will require this
 Speaking valves aid in phonation
 Laser Cordectomy
 Laser Cordotomy
 Woodman Arytenoidectomy

Conclusions – Key Points
 Management – Unilateral Paralysis
 Anterior and Posterior Glottic gap must be
addressed
 Arytenoid adduction is irreversible
 Continued improvement up to 1yr after Type I
thyroplasty
 Management – Bilateral Paralysis
 Preservation of airway is most important goal

Laryngeal paralysis final

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