How should true vocal cord palsy be evaluated and managed?

Evaluation and Management of True Vocal Cord Palsy

All patients with suspected vocal cord palsy require laryngoscopy for definitive diagnosis, and those with confirmed palsy should be referred to an otolaryngologist for comprehensive evaluation and early intervention to optimize voice outcomes and quality of life. 1, 2

Initial Evaluation

Clinical Assessment

When evaluating a patient with altered voice quality, pitch, loudness, or vocal effort that impairs communication or reduces quality of life, you must identify dysphonia through history and physical examination 1. Key historical factors to elicit include:

• Recent surgical procedures involving the head, neck, or chest (especially thyroidectomy, carotid endarterectomy, anterior cervical spine surgery, or thoracic procedures) 2
• Presence of concomitant neck mass
• Respiratory distress or stridor
• History of tobacco abuse
• Professional voice use
• Symptoms of breathiness, dyspnea, or mild dysphagia 2

Diagnostic Laryngoscopy

Perform laryngoscopy or refer to a clinician who can perform laryngoscopy when dysphonia fails to resolve within 4 weeks, or immediately if a serious underlying cause is suspected 1. This is critical because:

• Laryngoscopy is the gold standard for diagnosing vocal cord palsy 3, 4
• Early identification allows for timely intervention that improves long-term functional recovery 2
• Preoperative vocal fold paralysis may indicate invasive thyroid malignancy (>70% in invasive disease vs 0.3% in noninvasive disease) 2

Important caveat: Do NOT obtain CT or MRI prior to visualization of the larynx for patients with a primary voice complaint 1. Imaging should only be directed after laryngoscopy confirms the diagnosis and guides the workup based on the likely lesion site.

What NOT to Do Before Laryngoscopy

The guidelines are explicit about avoiding empiric treatment 1:

• Do not prescribe antireflux medications for isolated dysphonia without laryngeal visualization
• Do not routinely prescribe corticosteroids prior to laryngoscopy
• Do not prescribe antibiotics to treat dysphonia

Referral and Timing

Refer to an otolaryngologist immediately when abnormal vocal fold mobility is identified 2. Early referral is critical because:

• Patients who receive early vocal fold injection (<6 months) have decreased need for more invasive long-term therapy compared to late intervention 2
• Early medialization creates a favorable vocal fold position for phonation that can be maintained by synkinetic reinnervation 2
• Patients with temporary injection medialization are statistically less likely to require permanent surgical intervention compared to conservative management alone 2

Expedited Evaluation Indicators

Perform or refer for laryngoscopy immediately (not waiting 4 weeks) if 1:

• Recent surgical procedures (head, neck, chest)
• Recent endotracheal intubation
• Concomitant neck mass
• Respiratory distress or stridor
• Professional voice user

Management Approach

Voice Therapy

Advocate for voice therapy in patients with dysphonia from causes amenable to voice therapy, but only after diagnostic laryngoscopy has been performed and results communicated to the speech-language pathologist 1. Voice therapy combined with selective electrical stimulation may provide superior glottic closure compared to voice therapy alone 5.

Surgical Intervention

Advocate for surgery as a therapeutic option for patients with conditions amenable to surgical intervention, including 1:

• Suspected malignancy
• Symptomatic benign vocal fold lesions not responding to conservative management
• Glottic insufficiency

Early intervention (within 6 months) with temporary vocal fold injection is preferred because 2:

• Current injectables are largely resorbable, leaving no long-term effect if motion returns
• Can be performed in the office setting with good patient tolerance and minimal complications
• Provides afferent stimulation that increases rate and robustness of innervation
• Reduces need for permanent surgical procedures

Workup After Laryngoscopy Confirms Palsy

Once vocal cord paralysis is confirmed, imaging should be directed based on clinical findings 3:

• CT from skull base through upper mediastinum if solely recurrent nerve paralysis is present
• MRI of skull base if high vagal signs and symptoms are present; if negative, CT may also be needed
• MRI of brain plus neurology consultation if neurologic signs are not all ipsilateral
• Esophagoscopy or esophagram if esophageal obstruction is suspected

Quality of Life Considerations

Dysphonia dramatically impacts quality of life, affecting work ability and social, family, and vocational activities 2. Studies using the SF-36 quality of life survey demonstrate that dysphonia impacts all health status subscales 2. Early laryngoscopy, identification, and intervention allow patients to more quickly return to normal activities 2.

Common Pitfalls

• Waiting too long (>6 months) before intervention reduces effectiveness of temporary measures
• Ordering imaging before laryngoscopy wastes resources and delays diagnosis
• Empiric treatment with antireflux medications, steroids, or antibiotics without visualization
• Failing to distinguish true neurogenic paralysis from mechanical hypomobility or "pseudoparesis" (which can be excluded by electromyography) 6
• Not communicating laryngoscopy findings to the speech-language pathologist before initiating voice therapy 1