Notes on Recurrent Laryngeal Nerve Paralysis Cases and Observations

Overview of Recurrent Laryngeal Nerve Paralysis

  • Introduction to video examples of recurrent laryngeal nerve paralysis.
  • Focus on the involvement of the vocal folds and their position: median, paramedian, and abductor positions.
  • Observation points:
    • Vocal fold position and mobility during phonation.
    • Potential crossover movement in the uninvolved vocal fold.

Detailed Observations of Paralysis Cases

Case 1: Left Recurrent Nerve Paralysis (2 Weeks Post-Thyroidectomy)

  • Vocal fold characteristics:
    • Fixed in a paramedian position.
    • Retinoid movement: thrust forward during inspiration.
    • Scope alignment contexts are crucial for accurate assessment.
  • Vocal fold condition:
    • Thin, hypertonic, and slightly atrophic.
  • Phonation results:
    • Vocal fold vibrates with serious defects, especially in the posterior third.
    • Characterized by a breathy voice and short sounds due to closed position and reduced airflow.
  • Concept of atrophy:
    • Muscle shrinks due to denervation, losing the bulk from impaired neural signals.
  • Symptoms observed:
    • Breathiness during voice production.
  • Slow motion results:
    • Closure defect confirmed with airflow lifting the paralyzed vocal fold.

Case 2: Recovery After Two Months

  • Vocal fold status:
    • Left recurrent nerve paralysis shows recovery.
    • Retinoid movement is slower on the left but amplitude matches on both sides.
  • Phonation observation:
    • Vibration of vocal folds is near normal; voice quality has recovered for both high and low pitches.
  • Slow motion observations:
    • Symmetrical vibration with almost complete glottal closure.
    • Small posterior gap considered typical and possibly physiological rather than pathological.

Case 3: Left Recurrent Nerve Paralysis (13 Months Post-Thyroidectomy)

  • Vocal fold characteristics:
    • Fixed in a paramedian position with significant atrophy.
    • Large ventricular opening compared to previous cases.
  • Phonation observations:
    • Compensatory movement from the right arytenoid pushing left one back, slanting larynx left.
    • Weak high-pitched voice sometimes aphonic.
  • Androphobia of the edge and low amplitude of left fold vibration indicates poor function resulting from atrophy.
  • Slow motion results:
    • Asynchronous vibration often observed; left fold is driven upwards with no mucosal wave.
  • Considerations for treatment:
    • Intracordal fat injection recommended; efficacy and products vary based on evolving practices in treatment.

Case 4: Right Recurrent Nerve Paralysis (7 Months Post-Surgery for Thyroid Cancer)

  • Background:
    • Discuss characteristics of the surgical intervention on the thyroid gland and its relation to the recurrent laryngeal nerve.
  • Vocal fold observations:
    • Right vocal fold fixed in a paramedian position, arched, and atrophic with minimal vibration.
    • Presence of good arytenoid compensation noted.
  • Phonation status:
    • Semi-oval glottis shape; subpar vibration indicates ongoing dysfunction.
    • Left ventricular fold persists in a hypertonic state, masking vibration of the left vocal fold.
  • Recommendations:
    • Suggests intracordal fat injection due to observed atrophy and lack of function leading to inadequate glottal closure.

Case 5: Left Recurrent Nerve Paralysis (One Year Post-Thyroidectomy)

  • Vocal fold behaviors:
    • Harshly arched; positioned in an intermediate state;
    • Inadequate glottal closure prominent.
  • Slow motion results:
    • Clear atrophy exuded; serious closure defect confirmed.
  • Surgical indication:
    • Suggested for Type 1 thyroplasty to rectify positional abnormalities in the larynx.

Case 6: Bilateral Recurrent Nerve Paralysis (4 Months Post-Bilateral Thyroidectomy)

  • Vocal fold findings:
    • Both vocal folds fixed in an intermediate position, immobile during phonation and coughing.
    • Aphonia virtually total due to dysfunction.
  • Observation:
    • On inspiration sounds, arytenoids swing forward but no glottal activity.
  • Slow motion replay:
    • Brief symmetry during inspiration observed, but limited oscillation in fold movement.

Case 7: Transition to Abductor Paralysis (10 Months Post-Bilateral Thyroidectomy)

  • Vocal fold status:
    • Immobilized right arytenoid shows minimal lateral movement; some regeneration noted.
  • Glottal outcomes:
    • Narrow glottis during inspiration; voice status abnormal.
  • Surgical prospect:**
    • Surgery indicated to normalize airway breathing mechanics rather than voice production.

Summary of Key Concepts and Observations

  • Vocal fold paralysis characteristics pertaining to the recurrent laryngeal nerve allude to positional analysis: observed in paramedian or fixed states.
  • Phonation: varies significantly with the extent of atrophy and the state of compensation facilitated by surrounding muscular structures.
  • Treatment options require a dynamic understanding of individual physiology and dysfunction's recovery timeline, particularly concerning surgical interventions attempted and the fluctuating choices of bio-injectables for vocal fold restoration.